The receiver of signals of satellite radio navigation systems

 

(57) Abstract:

The invention relates to radio navigation systems. The receiver includes a radio frequency Converter, the N-channel digital correlator, the evaluator and the unit of data exchange. The transmitter includes a processor, random access memory, a persistent storage device (ROM), a real time clock and block the external interface. Radio-frequency Converter includes an input unit, an apparatus for forming signals heterodyne frequency block of the first frequency conversion signal channels of the second frequency conversion of signals respectively SRNS GPS and GLONASS. Each channel includes a filter, a mixer and an analog-to-digital conversion. Part of the apparatus of the heterodyne signal frequency includes a reference oscillator and blocks the formation of signals of the first, second and third heterodyne frequencies, the outputs of which are connected to the respective mixer unit of the first frequency conversion of signals and channels of the second frequency conversion signal. The processing unit of the third heterodyne frequency is made in the form of a frequency divider by eight, its input connected to the output of processing unit first getaway of the frequency synthesizer, the control inputs of which are connected through the block of data exchange with the ROM, which have been added to the first and second blocks of data storage heterodyne and intermediate frequencies respectively for the first and second modes of operation of the receiver corresponding to the signal reception of the SRNS GLONASS first and second ranges lettered frequencies with the numbers of characters "0" - "12" and "-7"- "4". Achievable technical result is the ability within a single receiver to receive and convert signals SRNS GPS and GLONASS in terms introduce new ranges lettered frequency signals SRNS GLONASS. 6 Il.

The invention relates to the field of navigation, and more specifically to receivers of signals from satellite navigation systems (SNS) GPS (USA) and GLONASS (Russia), providing simultaneous reception of the signals of these systems in the frequency range L1 code modulated C/A code code "standard precision".

Receivers SRNS GLONASS (global Navigation Satellite System) [1] and GPS (Global Position System) [2] is now widely used to determine the coordinates (latitude, longitude, altitude) and velocity of objects, and time. The use of SRNS signals frequency diapazone.

The main differences between the SRNS GPS and GLONASS are using different, though adjacent frequency bands, using different pseudotumour modulating codes and use code accordingly and the frequency separation of the signals of different satellites in the system. Thus, in the SRNS GPS frequencies L1 satellites emit modulated different pseudocumene code signals on the same carrier frequency of 1575.42 MHz, and the satellites of the SRNS GLONASS emit modulated same pseudotumour code signals on different carrier (lettered) frequencies lying in adjacent frequency domain.

Ratings lettered frequencies in the SRNS GLONASS are generated by the rule:

fi= fo+ifj,

where f1- nominals lettered frequencies;

f0- zero lettered frequency;

i - non lettered frequencies;

- the interval between lettered frequencies.

For frequencies of the considered range L1: f0= 1602 MHz, = 0,5625 MHz.

Distribution lettered frequencies among functioning satellites SRNS GLONASS set almanac transmitted in the frame of official information.

Lettered frequency signals of GLONASS are entered in accordance with the "Interfacealias, according to [1], provides for a range lettered frequencies from i = - 7 to i = 4. The offset range lettered frequency signals of GLONASS in another frequency region associated with the allocation of new frequencies for communication systems. This raises the problem of providing health equipment, receiving and processing signals SRNS GLONASS, both in terms of the specified range change lettered frequencies and in terms of complexity jamming environment caused by the operation of communication systems within a close range of frequencies.

The above-noted differences between the signals of the satellites SRNS GPS and GLONASS arising from the code separation when one carrier in the SRNS GPS and frequency separation in multi-carrier defined lettered frequencies in the SRNS GLONASS, cause differences in the technical means to perform the reception and correlation signal processing these SRNS.

Known, for example from [3, Fig. 1], the receiver signals SRNS GPS, containing connected in series RF Converter and the correlation processing unit associated with the computer - navigation processor, this part of the radio frequency Converter is tel, two quantizer for in-phase and quadrature channels, and the driver signal of the first heterodyne frequency (1401,51 MHz) and a unit that generates from the signal of the first heterodyne frequency signal of the second heterodyne frequency.

The receiver solves the technical problem of reception and digital signal processing SRNS GPS for the implementation of radio navigation measurements. The receiver does not allow to solve the problem of receiving signals SRNS GLONASS.

Known, for example, [4, 146-148 C., Fig.9.2], the signal receiver SRNS GLONASS ("single-channel equipment consumers "ASN-37" GLONASS"). The receiver includes a low noise amplifier-Converter RF Converter, a digital processing device and associated with them by means of the Converter interface (block of data) numerator (the navigation CPU). The composition of the low-noise amplifier-Converter includes bandpass filters, amplifier, mixer. Part of the radio-frequency Converter includes an intermediate frequency amplifier, a phase demodulator, mixer with phase suppression of the image channel, limiter and synth lettered frequencies, working from reference oscillator. Part of the digital education is, digital generator of Doppler shift of carrier frequency, the inverter phase-code storage of digital samples. The transmitter (the navigation CPU) contains a microprocessor series VM, random access memory (RAM), permanent memory (permanent memory). Synth lettered frequencies generates its output signals in accordance with lettered frequencies of the received signals SRNS GLONASS. Step lettered frequency generated by the synthesizer, is 0.125 MHz. The signal of the first heterodyne frequency is generated by multiplying the output frequency of the synthesizer to four, and the signal of the second heterodyne frequency - dividing the output frequency of the synthesizer on the two.

The receiver solves the technical problem of reception and digital signal processing SRNS GLONASS for the implementation of radio navigation measurements. The receiver does not allow to solve the problem of receiving signals SRNS GPS.

Despite the differences between the SRNS GPS and GLONASS, their proximity to destination, ballistic build satellites constellation and the used frequency range makes it possible to formulate and solve problems related to the creation of the it to improve the reliability, the reliability and accuracy of the positioning of the object, in particular, due to the possibility of working constellations with the best values of the geometrical factors [4, S. 160].

In this regard, the obvious importance of developing an integrated signal receivers SRNS GPS and GLONASS receivers, i.e. receivers, operating on the signals of both systems, and optimization of technical solutions aimed at simplification and minimization of such receivers.

Among the integrated signal receivers SRNS GPS and GLONASS known, see , for example, [4, 158-161 C., Fig. 9.8], the receiver solves the task of receiving signals SRNS GPS and GLONASS frequency band L1. The receiver includes a radio frequency Converter, the reference generator and the primary processor of the processing associated with the navigation processor. Part of the radio-frequency Converter includes a frequency divider ("diplexer") performing frequency division signals SRNS GPS and GLONASS, bandpass filters and low-noise amplifiers channels GPS and GLONASS, the mixer, the switch connecting the signal input of the mixer signals SRNS GPS or GLONASS, the switch connecting the reference input of the mixer signal of the first local oscillator for channel GPS Il the frequency is constant for signals SRNS GPS and GLONASS and the receiver path is implemented as common to these signals. The composition processor primary processing includes a multiplexer with a permanent storage device, digital generator lettered frequencies, a digital correlator, the generator of the SRP and the transmitter is a microprocessor associated with the navigation processor.

The receiver solves a technical problem in a sequential (serial time) signals SRNS GPS and GLONASS in the implementation of radio navigation measurements, while the signals of both systems use the same radio path. The receiver does not resolve the problem of simultaneous reception of signals from the SRNS GPS and GLONASS, which increases the time required to obtain navigation information.

Known integrated receiver signals SRNS GPS and GLONASS, described in [5], which solves the problem of simultaneous reception of signals both GPSr. The signal receiver SRNS GPS and GLONASS, described in [5], is adopted as a prototype.

Block diagram of the signal receiver SRNS GPS and GLONASS, taken as a prototype, shown in Fig. 1.

Receiver-prototype (see Fig. 1) contains a connected in series RF Converter 1, the input of which forms the signal input of the receiver, the m block 4 data exchange with the computer 5.

The transmitter 5 contains related bus communication processor 6, a random access memory (RAM) 7, a persistent storage device (ROM) 8, 9 hours real time and block 10 of the external interface, inputs-outputs of which form the information inputs and outputs of the receiver.

RF Converter 1 includes an input unit 11, unit 12 of the first frequency conversion signal, the first 13 and second 14 channels of the second frequency conversion of signals respectively SRNS GPS and GLONASS, as well as equipment 15 signal heterodyne frequencies containing the blocks forming signals of the first, second and third heterodyne frequencies (Fig. 1 not shown), the outputs of which form the output signals, respectively, first, second and third heterodyne frequencies.

The input unit 11 of the radio-frequency Converter 1 solves the problem of pre-filtering the input signals SRNS GPS and GLONASS and includes at least one bandpass filter (Fig.1 is not shown). The input unit 11 forms the entrance of the radio-frequency Converter 1. To the input unit 11 is connected receiving antenna.

Unit 12 of the radio-frequency Converter 1 solves the problem of the first frequency conversion signal is anal 13 of the second frequency conversion of the RF signals of the transducer 1 (the channel of the second frequency conversion signal SRNS GPS) contains serially connected filter 16, the mixer 17 and block 18 analog-to-digital conversion, the output of which forms the output of the channel 13 to the output signals of the SRNS GPS.

The channel 14 of the second frequency conversion of the RF signals of the transducer 1 (the channel of the second frequency conversion signal SRNS GLONASS) contains serially connected filter 19, the mixer 20 and the block 21 analog-to-digital conversion, the output of which forms the output of the channel 14 to the output signals of the SRNS GLONASS.

The outputs of the channels 13 and 14, which outputs a radio frequency Converter 1, associated with the first and second signal inputs of the N-channel digital correlator 2. Signal inputs digital correlator 2 are connected with the respective signal inputs of channels 3. Inputs and outputs data channels 3 are connected through input and output data bus digital correlator 2 through the block 4 data exchange with the computer 5.

In the radio frequency Converter 1, the inputs of the filters 16 and 19, which inputs respectively of the first 13 and second 14 channels of the second frequency conversion of the signals connected to the output of block 12 of the first frequency conversion signal. The input unit 12 is connected to the output of the input unit 11. The reference input of the mixer (Fig. 1 is not the signal of the first heterodyne frequency apparatus 15. The reference inputs of the mixers 17 and 20 of the first 13 and second 14 channels of the second frequency conversion of the signals connected respectively to the output signals of the second and third heterodyne frequency apparatus 15.

The receiver prototype works as follows.

Adopted by the antenna reception signals SRNS GPS and GLONASS frequency band L1 via the input unit 11, performing in the radio frequency Converter 1 frequency filtering of signals in this frequency range, is fed to the input unit 12 of the first frequency conversion signal.

In block 12, the signals of the SRNS GPS and GLONASS frequency band L1 amplified and converted by the frequency mixer, the reference input of which receives the signal of the first heterodyne frequency fG1= 1416 MHz generated in the apparatus 15 via the corresponding block signal of the first heterodyne frequency (Fig. 1 is not shown).

Converted in block 12 signals SRNS GPS and GLONASS frequency band L1 arrives at the inputs of the first 13 and second 14 channels of the second frequency conversion of the signals, i.e. the inputs of the filters 16 and 19. Each of these filters to filter out signals of one of the SRNS, namely, the filter 16 - whew filters 16 and 19 out-of-band interference and split systems (GPS and GLONASS) converted by the frequency signals in each of the channels 13 and 14 are received at the signal inputs of the mixers 17 and 20 respectively.

For the second frequency conversion performed in the channels 13 and 14, in the receiver prototype uses signals of the second and third heterodyne frequency fT2= 173,9 MHz and fG3= 178,8 MHz generated in the apparatus 15 via the respective blocks the formation of signals of the second and third heterodyne frequencies (Fig. 1 is not shown). The signal of the second heterodyne frequency fT2= 173,9 MHz is used to convert signals SRNS GPS in the mixer 17 of the first channel 13, and the signal of the third heterodyne frequency fG3= 178,8 MHz is used to convert signals SRNS GLONASS in the mixer 20 of the second channel 14.

Converted by the mixers 17 and 20 signals SRNS GPS and GLONASS are the inputs of the blocks 18 and 21 analog-to-digital conversion, where it is converted into a digital form, and each is converted into a digital form signals of GPS and GLONASS are represented as two quadrature components of these signals. Conversion to digital form is carried out with a clock frequency Ft.

To implement the analog-to-digital conversion without loss of navigation information being converted signals are coordinated in terms of frequency and range with the value that is supplied is ensured by selection of specific values of clock and heterodyne frequencies. In the receiver prototype is the clock frequency that determines the frequency of the analog-to-digital conversion, i.e. the sampling time selected Ft=57,0 MHz. The value of the clock frequency Ft=57,0 MHz is selected taking into account the possibility of processing in the receiver prototype signals SRNS GLONASS frequencies with letters from i = 0 to i = 24. Given this frequency is selected to be agreed values heterodyne frequency fT2= 173,9 MHz and fG3= 178,8 MHz for the second frequency conversion of signals, namely so that the average frequency signals SRNS GPS and GLONASS at the second intermediate frequency would be close to that of 14.25 MHz. This provides the possibility of sampling the signals in blocks 18 and 21 using 4-bit analog-to-digital Converter with a clock frequency Ft= 57,0 MHz (4 Of 14.25 MHz), as well as the formation of the subsequent case of double-bit samples of the inphase and quadrature components of the signals of the SRNS GPS and GLONASS, sampling, two times smallert, i.e., equal to 28.5 MHz (2 Of 14.25 MHz). The formation of these case of double-bit samples of the inphase and quadrature components of the signals of the SRNS GPS and GLONASS by using elements that are functionally part of Bokovikov 18,21 (Fig. 1), or part of a separate structural unit (Fig. 1, this embodiment is not shown).

With outputs of the radio-frequency inverter 1-phase and quadrature sample signal SRNS GPS and GLONASS are coming from by two-wire lines) on the first (GPS) and second (GLONASS) signal inputs of the N-channel digital correlator 2, engaged in their channels 3 digital signal processing satellites SRNS GPS and GLONASS in combination determined by commands received at the data inputs of channels 3 computer 5 through the block 4 data exchange. At clock inputs of channels 3 when it receives the clock signal with frequency Ft/2 (28,5 MHz).

Channels 3 (31, 32,... 3NN-channel digital correlator 2 in accordance with commands received from the computer 5 through the block 4 data exchange is carried out correlation processing of satellite signals GPSr, which is determined by the temporal position of the peaks of the correlation functions pseudotumour satellite signals GPSr, that is determined by the radio navigation parameters used in the calculation of the location of the object on the satellite signals SRNS.

Correlation processing of satellite signals GPSr in the switch input signals, digital mixers, digital controlled generator carrier, digital demodulators (correlators), programmable delay lines, the generator of the reference C/A code, digital controlled code generator, blocks the accumulation control register (Fig. 1 is not shown).

Switch input signals channel 3 is the selection signals one of the SRNS GPS or GLONASS). With digital mixers in the channel 3 provide selection signals a particular satellite SRNS and the transfer of the spectrum of these signals in the baseband frequency to the zero frequency). Using the signals generated by the digital controlled oscillator carrier. Digital demodulators (correlators) channel 3 perform the correlation of the satellite signals with the exact "P" (Punctual) and differential "E-L" (Early-Late) or early "E" (Early) copies of the reference C/A code SRNS GPS or GLONASS, respectively. These copies of the code are produced in each channel 3 programmable delay line, which is under control of the computer 5 through the block 4 data exchange allows you to change the interval between the early and late copies of the C/A code from 0.1 to 1 duration symbol C/A code and, therefore, to form a narrow discriminator" ("narrow correlator is ablativus in each of the channels 3 generator reference C/A code, receiving this clock frequency of 1.023 MHz for GPS or 0,511 MHz for GLONASS generated digital controlled code generator. The choice of the type produced by a pseudorandom code sequence and the values of the clock frequency code is carried out by teams of computer 5, arriving at the control inputs of these generators through the block 4 data exchange. The correlation results are accumulated in the respective blocks accumulation. Accumulation period equal to the period of C/A code, that is 1 MS. Accumulated data periodically read through the block 4 data transmitter 5, which implements all the algorithms, i.e. algorithms of search signals, tracking the carrier and code, receive service information. In accordance with the results of the correlation processing satellite signals SNS channels 3 digital correlator 2 the transmitter 5 generates control signals for channels 3, including the values of the carrier frequency for the digital controlled oscillator carrier and the values of the clock frequency code for the digital controlled code generator. The programmable delay line, the generator of the reference C/A code, switch the input signals is determined by the teams, LASS="ptx2">

The operation of the transmitter 5 is carried out according to the algorithm implemented by the processor 6 by using programs and data stored in the ROM 8 and the RAM 7 in accordance with the time signal generated in the clock 9 real-time. Results data signal processing in the receiver prototype are given in block 10 of the external interface, through it in the computer 5 receives signals external control.

Solutions implemented in the receiver prototype when receiving and frequency conversion of the received signals, based on the absence of restrictions on the number of synths that are used to generate signals heterodyne frequencies. Thus, in the device prototype uses heterodyne signals with frequencies 1416 MHz, 173,9 MHz and 178,8 MHz. None of these heterodyne frequencies cannot be obtained from the other heterodyne frequency by simple multiplication or division. Therefore, heterodyne frequency in the receiver prototype synthesized using three separate generators (synthesizers) heterodyne frequencies. Each of these synths heterodyne frequency is a complex implementation independent radio device. The complexity of synthesizers heterodyne yuemin frequency (relative frequency instability 10-1110-121 C. [9] ), since this will largely depend on the output characteristics of the receiver as a whole.

Solutions implemented in the receiver prototype by accepting and processing the received signals, based on the use of signals SRNS GLONASS certain range lettered frequencies (numbers of characters from i = 0 to i = 24) corresponding to this range the value of the clock frequencyt= 57 MHz. In the receiver prototype is not provided the technical means for receiving signals SRNS GLONASS numbers of characters in the range from i = -7 to i = - 1 input in accordance with [1]. A possible solution to the problem of reception of signals SRNS GLONASS with lettered frequencies, which includes these additional lettered frequencies within the structure of the receiver of the prototype can be achieved by expanding (about 30%) bandwidth RF Converter 1 for signals SRNS GLONASS and a corresponding increase in the clock frequency (sampling rate) for the digital correlator 2. However, there are problems with providing noise immunity of the receiver under the influence of signals communication systems, emitted in the same frequency range as the signal is esterom 2 power is directly proportional to the increase in frequency.

The task of the claimed invention is to provide a device performing simultaneous reception and conversion of signals SRNS GPS and GLONASS modulated codes standard precision (C/A codes) in the L1 band, using two synthesizers to form heterodyne frequencies (and not three, as in the prototype), with capability of receiving and processing signals SRNS GLONASS in the conditions imposed in accordance with [1] new ranges lettered frequency signals SRNS GLONASS, namely in the range i = 0 to 12 and i = -7 - 4, without increasing the bandwidth of the radio frequency Converter, to ensure the required frequency selectivity, which determines the noise immunity of the receiver, and enabling operation of the digital correlator on the minimum clock frequency (20 - 22) MHz.

The invention consists in that in the receiver the signals GPSr containing serially connected RF Converter, the input of which forms the signal input of the receiver, and N-channel digital correlator connected through a block of data exchange with the computer that contains the associated bus communication processor, RAM, ROM, a real time clock and block the external and OBRAZOVATEL contains the input unit, including at least one band-pass filter connected to the output of the input unit of the first frequency conversion signal, including at least one amplifier and a mixer connected to the output of the first frequency conversion signal of the first and second channels of the second frequency conversion of signals respectively SRNS GPS and GLONASS, each of which contains a filter connected in series, the mixer and the analog-to-digital conversion, the output of which forms the output of the channel, as well as containing blocks forming signals of the first, second and third heterodyne frequency equipment generating signals heterodyne frequency, the output signal of the first heterodyne frequency which, formed by the unit output signal of the first heterodyne frequency, is connected to a reference input of the mixer unit of the first frequency conversion signal, the output signal of the second heterodyne frequency formed by the unit output signal of the second heterodyne frequency, is connected to a reference input of the mixer of the first channel of the second frequency conversion signal, the output signal of the third heterodyne frequency formed by the output processing unit of the third GE is Alov, in the radio frequency Converter in the apparatus for forming signals heterodyne frequency block signal of the third heterodyne frequency is made in the form of a frequency divider by eight, whose input is connected to the unit output signal of the first heterodyne frequency, and blocks the formation of signals of the first and second heterodyne frequency is made in the form of tunable synthesizers frequency reference inputs are connected to the output of the reference oscillator, and control inputs connected through the appropriate channel unit exchanging data with the ROM of the computer, in which inputs of the first and second blocks of data storage heterodyne and intermediate frequencies respectively for the first and second modes of operation of the receiver, corresponding to the reception signals SRNS GLONASS first and second ranges lettered frequencies with the numbers of characters "0" - "12" and "-7" - "4".

The essence of the invention, the possibility of its implementation and industrial use are illustrated by the drawings and frequency diagrams shown in Fig. 1 - 6, where:

in Fig. 1 shows a block diagram of the prototype;

in Fig. 2 illustrates a structural diagram of the proposed receiver GPSr in Krasnogo digital correlator of the proposed receiver SRNS in this implementation;

in Fig. 4 shows a frequency histogram illustrating the distribution of the frequency bands of the signals of the SRNS GPS (Fig. 4a) and signals SRNS GLONASS numbers lettered frequencies of the first range "0" - "12" (Fig. 46) and the second range "-7" - "4" (Fig. 4B) to the first frequency conversion;

in Fig. 5 presents a frequency histogram illustrating the distribution of the frequency bands of the signals of the SRNS GPS (Fig. 5A,b) and GLONASS (Fig. 5B,d) after the first frequency conversion in the inventive receiver signals GPSr for the first (Fig. 5A, b) and the second (Fig. 5B,d) modes of the receiver corresponding to the signal reception of the SRNS GLONASS first and second ranges lettered frequencies with the numbers of characters "0" - "12" and "-7" -"4", respectively;

in Fig. 6 shows a frequency histogram illustrating the distribution of the frequency bands of the signals of the SRNS GPS (Fig. 6A,b) and GLONASS (Fig. 6b,d) after the second frequency conversion in the inventive receiver signals GPSr for the first (Fig. 6A, b) and the second (Fig. 5B,d) modes of the receiver corresponding to the signal reception of the SRNS GLONASS first and second ranges lettered frequencies with the numbers of characters "0" - "12" and "- 7" - "4", respectively.

The inventive receiver SRNS in this example implementation includes (see the ml receiver, and N-channel digital correlator 2, containing N channels 3 (31, 32,....3Nassociated through block 4 data exchange with the computer 5.

The transmitter 5 contains related bus communication processor 6, a RAM 7, a ROM 8, 9 hours real time and block 10 of the external interface, inputs-outputs of which form the information inputs and outputs of the receiver.

RF Converter 1 includes an input unit 11, unit 12 of the first frequency conversion signal, the first 13 and second 14 channels of the second frequency conversion of signals respectively SRNS GPS and GLONASS, as well as equipment 15 signal heterodyne frequencies.

The channel 13 of the second frequency conversion of the RF signals of the transducer 1 (the channel of the second frequency conversion signal SRNS GPS) contains serially connected filter 16, the mixer 17 and block 18 analog-to-digital conversion, the output of which forms the output of the channel 13 output the converted signals SRNS GPS.

The channel 14 of the second frequency conversion of the RF signals of the transducer 1 (the channel of the second frequency conversion signal SRNS GLONASS) contains serially connected filter 19, the mixer Ignatov SRNS GLONASS.

The input unit 11 of the radio-frequency Converter 1, which solves the task of pre-filtering the input signals SRNS GPS and GLONASS, contains at least one bandpass filter. In this example implementation (Fig. 2) that have practical application, the input unit 11 includes serially connected first band-pass filter 22, the amplifier 23 and the second band-pass filter 24.

To the input unit 11, i.e. to the input of the filter 22, is connected receiving antenna.

Unit 12 of the radio-frequency Converter 1, which solves the problem of the first frequency conversion signal SRNS GPS and GLONASS, contains at least one amplifier and the mixer. In this example implementation (Fig. 2) that have practical application, the block 12 includes a serially connected first amplifier 25, the mixer 26 and the second amplifier 27.

In practical circuits in the composition of the mixers 17, 20 channels 13 and 14 are amplifiers with adjustable gain, and the blocks 18, 21 analog-to-digital conversion channels 13 and 14 can be performed, for example, in the form of threshold devices that perform the function of a case of double-bit quantizer level.

Apparatus 15 of the heterodyne signal frequency Innoi frequency and the block 30 signal of the third heterodyne frequency, the outputs of which form the output signals, respectively, first, second and third heterodyne frequency apparatus 15. Part of the apparatus 15 also includes a reference oscillator 31.

In the inventive receiver units 28 and 29 forming signals of the first and second heterodyne frequency is made in the form of a tunable frequency synthesizers, and the block 30 signal of the third heterodyne frequency - divider frequency by eight. The reference inputs of the blocks 28 and 30 generate signals of the first and second heterodyne frequency connected to the output of the reference oscillator 31. The input unit 30, the signal of the third heterodyne frequency connected to the output of block 28 signal of the first heterodyne frequency.

The control inputs of the blocks 28 and 29 are connected through the appropriate channel unit 4 data exchange with ROM 8 transmitter 5, which further introduced the first 32 and second 33 blocks of data storage heterodyne and intermediate frequencies respectively for the first and second modes of operation of the receiver corresponding to the signal reception of the SRNS GLONASS first and second ranges lettered frequencies with the numbers of characters "0" - "12" and "-7" - "4".

The inputs of the filters 16 and 19, which inputs respectively of the first 13 and the Oia frequency signals, that is, the output of the amplifier 27. The input unit 12, that is, the input of the amplifier 25 connected to the output of the input block II, i.e. to the output of the bandpass filter 24.

The output signal of the first heterodyne frequency apparatus 15, that is, the output unit 28 connected to the reference input of the mixer 26 of the block 12 of the first frequency conversion signal. The output signal of the second heterodyne frequency apparatus 15, that is, the output unit 29 connected to the reference input of the mixer 17 channel 13 of the second frequency conversion signal. The output signal of the third heterodyne frequency apparatus 15, that is, the output unit 30 connected to the reference input of the mixer 20 channel 14 of the second frequency conversion of signals.

The outputs of the channels 13 and 14, which outputs a radio frequency Converter 1 connected to the first and second signal inputs of the N-channel digital correlator 2.

In the inventive receiver signals GPSr N-channel digital correlator 2 may be performed, for example, in accordance with standard structural diagram of a multichannel correlator presented, in particular, in [5]. In this implementation each of the channels 3 N-channel digital correlator 2 includes (see Fig. 3) switch input signals 34, the blocks 35, 36, or code 41, the generator 42 of the reference C/A code (GPS and GLONASS), a programmable delay line 43, digital mixers 44 and 45 respectively in-phase and quadrature correlation processing channels, the correlators (digital demodulator) 46, 47, 48, 49. The outputs of blocks accumulation of 35 to 38, the control input of the digital controlled oscillator carrier 39, the control input of the register 40 of the control, the control input of the digital controlled oscillator 41 code and the first input of the generator 42 of the reference C/A code for each of the channels 3 are connected through input and output data bus digital correlator 2 through the block 4 data exchange with the computer 5.

In each of the channels 3 of the first and second inputs (inputs GPS and GLONASS) of the switch 34, the input signals connected to respective signal inputs of the N-channel digital correlator 3. The control input of the switch 34, the input signals connected to the first output of the register 40 control. The second and third outputs of the register 40 control connected respectively to the input of the programmable delay line 43 and the second input of the generator 42 of the reference C/A code. The output of switch 34 is connected with the first inputs of digital mixers 44 and 45, the second inputs of which are connected respectively to the first and second vicodinorder carrier 39, digital controlled oscillator 41 of the code of the programmable delay line 43 form a clock input signal of channel 3, which is connected to the clock input of the N-channel digital correlator 2. The digital outputs of the mixers 44 and 45 are connected with the first inputs of correlators (digital demodulators) 46, 47 and 48, 49 respectively. The second inputs of the correlators (digital demodulators) 46, 49 and 47, 48 are connected with the corresponding outputs of the programmable delay line 43 outputs the exact "P" (Punctual) and differential "E-L" (Early-Late) or early "E" (Early) copies of the reference C/A code SRNS GPS or GLONASS. Signal input of the programmable delay line 43 is connected to the output of the generator 42 of the reference C/A code forming the C/A code SRNS GPS or GLONASS, the third input of which is connected to the output of the digital controlled oscillator 41 of the code. The outputs of the correlators (digital demodulators) 46 - 49 are connected respectively to the inputs of the blocks 35 and 38 of accumulation.

The components of the inventive receiver elements, nodes, blocks are known elements, nodes, and blocks, practically used in the technique of reception and correlation signal processing SRNS.

So, in the radio frequency Converter 1, the input unit 11, including bandpass filters 22, 24 and the x function of bandpass filters, and amplifier type MGA-87563 HEWLETT-PACKARD.

Included in block 12 of the first frequency conversion signal amplifier 25 and the mixer 26 may be implemented, for example, using a chip-type MS MOTOROLA, and the amplifier 27 unit 12 using the chip-type UPC2715 firm NEC.

Included in the channels 13 and 14 of the second frequency conversion of the signals from the filters 16 and 19 can be implemented in the form of bandpass filters surface acoustic wave (saw), see, for example, [10, 217 to 220 C.]; mixers 17, 20 and members amplifiers with adjustable gain can be realized, for example, using chip type UPC2753 company NEC and threshold device blocks 18, 21 analog-to-digital conversion using dual Comparators type MAX 962 firm MAXIM.

N-channel digital correlator 2 with the considered structure of the channels in the practical implementation of the receiver can be made in the form of LSI large scale integration using libraries of standard elements, for example, SAMSUNG ELECTRONICS firms or SGS TOMSON.

Unit 4 communication and the transmitter 5 is a conventional, well-known digital computing technology is enerator 31 are implemented on commercially available elements.

So, part of the hardware 15 reference generator 31 may be implemented as a crystal oscillator that generates a frequency signal 15,36 MHz. In particular, can be used thermo-compensated technological quartz oscillator type TEMPUS-LVA MOTOROLA.

The blocks 28 and 29 forming signals of the first and second heterodyne frequency representing a frequency synthesizers can be made in the form of serially connected unit phase-locked loop (PLL) and the oscillator, voltage-controlled, the output of which forms the output of the frequency synthesizer connected to the signal input of the PLL, the reference and control inputs which form the reference and control inputs of the block. As a generator, voltage-controlled, in that the synthesizer can be used, for example, a generator that is included in the above chip MS MOTOROLA used to implement the amplifier 25 and mixer 26 of the block 12 of the first frequency conversion signal. Block PLL synthesizer can be implemented, for example, using a chip-type LMX2330 company NATIONAL SEMICONDUCTOR, which contains in its composition factors of the input and reference frequency, a phase detector, a buffer and an internal re the PLL during its implementation on the chip LMX2330 installed external signals digital codes received at control inputs of the chips through the appropriate channel unit 4 communication of the blocks 32, 33 ROM 8 transmitter 5. The transfer of these codes is done through the serial interface. The ratios of the dividers of the PLL block is set based on the desired ratio between the reference frequency (15,36 MHz) generated by the reference generator 31, and the frequency of the local oscillator generated by a voltage controlled oscillator, depending on the receiver operation mode determined by the range lettered frequency signals SRNS GLONASS (number of characters "0" to "12" or"- 7" - "4"). Phase detector of the PLL block generates the voltage corresponding to the misalignment of the phase reference signal and the lo signal (outputs of the respective frequency dividers), which is used to adjust the frequency of the oscillator, voltage-controlled through its control varicap. This voltage is fed to the specified varicap through part of the block PLL filter capable of forming a transfer characteristic of the loop PLL with a bandwidth of 50 kHz.

Specified building blocks 28 and 29 forming signals of the first and second heterodyne frequency with the signal of the third heterodyne frequency, representing a frequency divider to eight, may be made on the basis of commonly output frequency dividers, for example, frequency divider type MS MOTOROLA mode division by 2, and the frequency dividers of the type MS 12093 MOTOROLA mode division by 4.

The work of the proposed receiver consider the example of receiving and processing signals SRNS GPS and GLONASS modulated codes standard precision (C/A codes) in the range of LI, for the case when the signals SRNS GLONASS signals with lettered frequencies of the first ("0" to "12") or the second("- 7" - "4") ranges.

The inventive receiver operates as follows.

Received antenna signals SRNS GPS and GLONASS frequency band L1 arrive at the signal input of the radio-frequency Converter 1, that is, to the input of the input unit 11 (Fig. 2). Signals SRNS GPS range LI occupied frequency band width F = 8,184 MHz (four lobes in the spectrum of the signal in both directions from the carrier to implement the "narrow correlator"), and the signals of the SRNS GLONASS L1 band occupied by the frequency band width F 10,838 MHz (case lettered frequencies "On" - "12") and F = 10,2755 MHz (case lettered frequencies "-7" - "4"). The position of the frequency bands occupied by- (1571,328 - 1579, 512) MHz, Fig. 4B - frequency band signals of the SRNS GLONASS L1 band for the case of literal frequencies"0" - "12" (1599,956 - 1610, 794) MHz, Fig. 4B - frequency band signals of the SRNS GLONASS L1 band for the case of literal frequencies"- 7" - "4" (1596,019 - 1606, 294) MHz. The input unit 11 transmits on its output signals of the SRNS GPS and GLONASS L1 band specified frequency bands (i.e. frequencies from 1571, 328 MHz to 1610, 794 MHz).

In the input unit 11, the signals of the SRNS GPS and GLONASS is fed to the input of the first bandpass filter 22, performs frequency filtering of signals in this frequency range. From the output of the filter 22 signals SRNS GPS and GLONASS go through an amplifier 23 to the input of the filter 24, which in this case is identical to the filter 22 and has the same amplitude-frequency characteristic. The use of two bandpass filters 22 and 24 connected by the amplifier 23, allows to implement the necessary characteristics of the input unit 11 to the frequency selectivity and the ratio of signal to noise for a given total bandwidth (1571,328 - 1610, 794) MHz.

From the output of block 11 signals SRNS GPS and GLONASS frequency band L1 is fed to the input unit 12 of the first frequency conversion signal, where the increase in the howling intermediate frequency).

For the first frequency conversion performed in the mixer 26 of the block 12, is used, the signal of the first heterodyne frequency synthesized in block 28 of the reference signal frequency 15,36 MHz, generated by reference generator 31. In the first mode of operation of the proposed receiver frequency signal of the first heterodyne frequency is set to fG1(1) = 1412 MHz, and the second fG1(2) = 1408 MHz.

In the result of the first conversion frequency regulation frequency bands occupied by the signals of the SRNS GPS and GLONASS on-axis frequency is changed, as shown in Fig. 5, where Fig. 5A - location of the frequency bands of the signals of the SRNS GPS for the first mode of operation (159,328 - 167,512) MHz, Fig. 5B is the location of the frequency bands of the signals of the SRNS GPS for the second mode of operation (163,328 - 171,512) MHz, Fig. 5B is the location of the frequency bands of the signals of the SRNS GLONASS for the first mode of operation (187,956 - 198,794) MHz, Fig. 5g - the location of the frequency bands of the signals of the SRNS GLONASS for the second mode of operation (188,019 - 198,294) MHz.

Converted to the first intermediate frequency in block 12 of the radio-frequency Converter 1 signals SRNS GPS and GLONASS from the output of the amplifier 27 receives the inputs of the first 13 and second 14 channels of the second frequency conversion signal is estoya GPSr, namely, the filter 16 is filtered signals SRNS GPS in the frequency range (159,328 - 171,512) MHz, and the filter 19 - filtering signals SRNS GLONASS frequency range (187,956 - 198,794) MHz.

Filtered from out-of-band interference converted to the first intermediate frequency signals SRNS GPS (Fig. 5A,b) from the output of the filter 16 are received at the signal input of the mixer 17 where the second frequency conversion signal SRNS GPS.

Filtered from out-of-band interference converted to the first intermediate frequency signals SRNS GLONASS (Fig. 5B,g) from the output of the filter 19 are received at the signal input of the mixer 20, where the second frequency conversion signal SRNS GLONASS.

For the second frequency conversion signal SRNS GPS carried out in the mixer 17 channel 13, is used, the signal of the second heterodyne frequency synthesized in block 29 of the reference signal frequency 15,36 MHz, generated by reference generator 31. In the first mode of operation of the proposed receiver frequency signal of the second heterodyne frequency is set to fT2(1) = 179 MHz, and the second fT2(2) = 183 MHz.

For the second frequency conversion signal SRNS GLONASS carried out in the mixer 20 channel who drove the first heterodyne frequency, synthesized by block 28. In the first mode of operation of the proposed receiver frequency signal of the third heterodyne frequency is set to fG33(1) = 1/8fu1(1) = 176,5 MHz, and the second fG3(2) = 1/8fG1(2) = 176 MHz.

In the result of the second frequency conversion the position of the frequency bands occupied by the signals of the SRNS GPS and GLONASS on-axis frequency varies as shown in Fig. 6, where Fig. 6A - location of the frequency bands of the signals of the SRNS GPS for the first mode of operation (13,99 - 22,17) MHz, Fig. 6b is the location of the frequency bands of the signals of the SRNS GPS for the second mode of operation (10,99 - 19,17) MHz, Fig. 6b is the location of the frequency bands of the signals of the SRNS GLONASS for the first mode of operation (11,46 - 22,29) MHz, Fig. 6g is the location of the frequency bands of the signals of the SRNS GLONASS for the second mode of operation (12,02 - 22,29) MHz.

Converted by the mixers 17 and 20 signals SRNS GPS and GLONASS in each of the channels 13 and 14 of the second frequency conversion signals are amplified using amplifiers with adjustable gain, part mixer, and then subjected to analog-to-digital conversion in blocks 18 and 21.

In practical circuits, analog-to-digital conversion in blocks 18 and 21 may conclude voennih Comparators type MAX 962 company MAXIM. In this analog-to-digital conversion signals generated by the blocks 18 and 21, the characteristic is the presence of a carrier, which will be removed later in the channels 3 N-channel correlator 2, namely, in the digital mixers 44 and 45 in-phase and quadrature correlation processing channels.

Thus formed in the radio-frequency Converter 1 signals SRNS GPS and GLONASS with outputs of blocks 18 and 19, the outputs of the channels 13 and 14, are received on the first (GPS) and second (GLONASS) signal inputs of the N-channel digital correlator 2 channels 3 (31, 32,..3N) carried out correlation processing of satellite signals SRNS GPS and GLONASS in combination determined by commands received at the control inputs of channels 3 computer 5 through the block 4 data exchange. At clock inputs of channels 3 digital correlator 2 when it receives the clock signal with frequency Ft. The formation of the clock signal can be performed using a separate clock signals. In practical circuits, the clock generation of the signals can be signals from heterodyne frequency, for example, from the signal of the third heterodyne frequency by dividing this frequency by eight FtOh sampling in digital signal processing in the N-channel digital correlator 2 is the value of Ft22 MHz. Thus, the value of the clock frequency Ftand the value of the frequency band converted signals SRNS GPS and GLONASS are interconnected in an approximate ratio of 2: 1, which allows the digital signal processing without loss of navigation information. This relatively low value of the clock frequency Ft22 MHz facilitates the implementation of the digital correlator 2, reduces its power.

During correlation processing satellite signals GPSr carried out in each of the channels 3 (31, 32,...3NN-channel digital correlator 2 in accordance with commands received from the computer 5 through the block 4 data exchange are determined by the temporary provisions of the peaks of the correlation functions pseudotumour satellite signals GPSr representing a desired radio navigation parameters used when calculating the location of the object on the satellite signals SRNS.

The channel 3 in the example implementation is as follows. With the signal inputs of the N-channel digital correlator 2 case of double-bit quantized signals SRNS GPS and GLONASS are received in each of the channels 3 of the first and second signal means under the influence of control signals of the processor 5, coming into the register 40 through the block 4 data exchange, selects which of the two signals (GPS or GLONASS) will be processed in a given channel. Digital controlled oscillator 39 of the carrier produces in-phase and quadrature phase components of the carrier frequency reference signal, which are multiplied with the input signal in digital mixers 44 and 45.

Digital mixers 44 and 45 of the channel 3 provide the selection signal of this character SRNS GLONASS signal or the satellite SRNS GPS and the transfer of the spectrum of this signal on the main band (at zero frequency). Thus the result of multiplication of the signals in digital mixers 44 and 45 is "removing" carrier-phase and quadrature components of the processed signal,

Digital controlled oscillator carrier 39 is controlled by the processor 5 through the block 4 data exchange for closing loops tracking the frequency and phase of the carrier input signal. The value of the frequency of the output signal generated by the digital controlled oscillator 39 of the carrier, is set depending on the mode of operation of the proposed receiver. In the first mode (i = 0 - 12) set the frequency of the output signal generator 39 is carried out on the basis of the data items is 5.

After "removing" the carrier in digital mixers 44 and 45 in-phase and quadrature components of the signal are correlated in correlator 46-49 with copies of the reference C/A code generated by the following blocks: digital controlled oscillator 41 of the code generator 42 of the reference C/A code (GPS and GLONASS) and the programmable delay line 43.

Digital controlled oscillator 41 of the code generates the clock signal C/A code 1.023 MHz for GPS or 0,511 MHz for GLONASS, which is then fed to the corresponding input of the generator 42 of the reference C/A code (GPS and GLONASS). Select the clock frequency of the code shall be in accordance with commands of the transmitter 5, received at the control input of the generator 41 through the block 4 data exchange.

Based on the clock signal C/A code received from the output of the digital controlled oscillator 41 of the code generator 42 of the reference C/A code generates the reference C/A code for processing in the channel 3 signal corresponding to the respective satellite GPSr. Generated by the generator 42 of the reference C/A code unique to each satellite SRNS GPS that uses code division signals, and the same for all satellites SRNS GLONASS uses frequency division signals. The choice of a type code, that is, VI is slitely 5, coming to the first output of generator 42 through the block 4 data exchange.

Generated by the generator 42 of the reference C/A code is supplied to the programmable delay line 43. Programmable delay line 43 carries out a temporal offset of the reference C/A code, forming at its two outputs accurate "R" (punctual) and differential "E-L" (early-minus-late) a copy of the reference C/A code. The exact "P" (punctual) a copy of the reference C/A code is fed to the second inputs of correlators 46 and 49, and the difference "E-L" (early-minus-late) a copy of the reference C/A code on the second inputs of correlators 47 and 48. The programmable delay line is realized under the action of control signals generated by the register 40 management of a managed computer 5 through the block 4 data exchange. When this is carried out varying the spacing between the early and late copies of the C/A code from 0.1 to 1 duration symbol C/A code, thereby narrow discriminator" ("narrow correlator") in the tracking system code [6, 7, 8].

The results of the correlation processing of the processed signal is performed in the correlator 46 - 49, accumulate in blocks 35-38 accumulation time interval equal to the duration of the epoch code (1 MS), and then read processemail signal.

The operation of the transmitter 5 is carried out by standard algorithms navigation transmitter multi-channel receiver signals GPSr. These algorithms are implemented by the CPU 6 using programs and data stored in the ROM 8 and the RAM 7 of the transmitter 5, in accordance with the time signal generated in the clock 9 real-time.

The output results of the signal processing in the receiver are issued through the block 10 on the external interface of the computer 5 through the same block 10 in the computer 5 receives signals external control.

Change the mode of operation of the proposed receiver, corresponding to the transition signals SRNS GLONASS from the first range lettered frequencies (i = 0 to 12) in the second range (i = -7 to 4), is carried out, for example, under the action of external control commands received through the block 10 on the external interface of the processor 6, ROM 8 transmitter 5. Change the mode of operation of the proposed receiver can be, for example, 9 hours real time in accordance with the date entered change (until 2005 - the first mode, since 2005 - the second mode). When the setting operation mode in ROM 8 transmitter 5 is triggered, the corresponding block 32 or 33 storage heterodyne and the ex first ("0" - "12") and the second("- 7" - "4") ranges lettered frequencies.

Thus, in the inventive device to perform the goal of the project is ensured within a single receiver to receive and convert signals SRNS GPS and GLONASS in the conditions imposed in accordance with [1] new ranges lettered frequency signals SRNS GLONASS, namely, the ranges of numbers of characters "0" - "12" and "-7" - "4", without increasing the bandwidth of the radio frequency Converter, to ensure the required frequency selectivity, which determines the noise immunity of the receiver, and enabling operation of the digital correlator on the minimum clock frequency (20 - 22) MHz. The solution is carried out without any replacement of assemblies and units of the receiver, including without replacement or modification of bandpass filters, determining the frequency selectivity and interference immunity of the receiver. The solution is carried out using two (and not three, as in the prototype) synthesizer used to generate heterodyne frequencies, namely synths first and second heterodyne frequency.

Of the above it is seen that the invention feasible industrially applicable, ditch, working simultaneously on signals SRNS GPS and GLONASS and implement "standard precision" navigation metaproterenol. This permits the operation of the receiver in terms of change lettered frequency signals SRNS GLONASS carried out in accordance with [1].

Sources of information

1. "Global Navigation Satellite System - GLONASS. The interface control document. KNITS videoconferencing Russia, 1995.

2."Global Position System. Standard Positioning Service. Signal Specification." USA, 1993.

3. Global Positioning System (GPS) Receiver RF Front End. Analog-DigitI Converter. Rockwell International Proprietary Information Order Number. May 31, 1995.

4. Network satellite navigation system / C. S. Shebshaevich, p.p. Dmitriev, N. In.Ivancevich etc. // M, Radio and communications, 1993.

5. Riley , S., Howard N., Aardoom E" P. Daly, P. Silvestrin "A Combined GPS/GLONASS High Precision Receiver for Spase Applications", Proc. jfION GPS-95, Palm Springs, CA, US, Sept. 12-15, 1995, p. 835-844.

6. A. J. Van Dierendonck., Pat. Fenton and Tom Ford. Theory and Performance of Narrow Correlator Spacing in a GPS Reciever. Navigation: Jornal of The Institute of Navigation, Vol. 39, N 3, 1982.

7. U.S. patent N 5390207, CL G 01 S 5/02, H 04 B 7/185, publ. 14.02.95. (Fenton, A. J. Van Dierendonck, "Pseudorandom noise ranging receiver which compensates for multipath distortion by dynamically adjusting the time delay spacing between early and late correlators").

8. U.S. patent N 5495499, CL H 04 L 9/00, publ. 27.02.96. (Fenton, A.>/P>9. Moses I. Navstar Global Positioniny System oscillator regnirements for the Manpack GPS. Proc. of the 30th Annual Freguency Control Sympos., 1976, pp. 390-400.

10. A receiving device / Banks C. N., The Barulin L. G., Azishski M. I. and others / M, Radio and communication, 1984.

11. Professional Products Handbook 1C May 1991. GEC Plessey Semiconductors.

The receiver of signals of satellite radio navigation systems containing serially connected RF Converter, the input of which forms the signal input of the receiver, and N-channel digital correlator connected through a block of data exchange with the computer that contains the associated bus communication processor, random access memory, permanent memory, real time clock and block external interface, inputs-outputs of which form the information inputs and outputs of the receiver, and the radio-frequency Converter includes an input unit comprising at least one band-pass filter connected to the output of the input block, the block of the first frequency conversion signal, including at least one amplifier and a mixer connected to the output of the first frequency conversion signal, the first and second channels of the second frequency conversion of signals respectively snye filter, the mixer and the analog-to-digital conversion, the output of which forms the output of the channel, as well as containing blocks forming signals of the first, second and third heterodyne frequency equipment generating signals heterodyne frequency, the output signal of the first heterodyne frequency which is formed by the unit output signal of the first heterodyne frequency, is connected to a reference input of the mixer unit of the first frequency conversion signal, the output signal of the second heterodyne frequency formed by the unit output signal of the second heterodyne frequency, is connected to a reference input of the mixer of the first channel of the second frequency conversion signal, the output signal of the third heterodyne frequency, formed by the output processing unit of the third heterodyne frequency, is connected to a reference input of the mixer of the second channel of the second frequency conversion signal, wherein the RF Converter in the apparatus for forming signals heterodyne frequency block signal of the third heterodyne frequency is made in the form of a frequency divider by eight, whose input is connected to the unit output signal of the first heterodyne frequency and scale of frequency, the reference inputs are connected to the output of the reference oscillator, and control inputs connected through the appropriate channel unit data exchange with the permanent storage device of the computer in specified a permanent storage device additionally introduced first and the second blocks of the data storage heterodyne and intermediate frequencies respectively for the first and second modes of operation of the receiver corresponding to the signal reception of the SRNS GLONASS first and second ranges lettered frequencies with the numbers of characters "0" - "12" and "7" to "4".

 

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