The receiver of the user equipment signals of global satellite navigation systems

 

(57) Abstract:

The invention relates to the field of satellite navigation and can be used in tracts of primary information processing voltage signals of global navigation satellite systems GPS NAVSTAR (USA) and GLONASS (Russia). The receiver of the user equipment signals of global satellite navigation systems contains two antennas, two bandpass filter preselector, three low-noise amplifier, microwave switch, reference OCXO, two driver grid reference frequency, five mixers, five bandpass filters, three intermediate frequency amplifier, two block automatic gain control, two low-pass filter, and two analog-to-digital Converter additionally includes block calibrator, and the fourth intermediate frequency amplifier. Achievable technical result of the invention is the ability to carry out the calibration of the receiving amplifier channel of the claimed device, automated monitoring of the integrity of the operation of a navigation satellite systems GLONASS and NAVSTAR", as well as checking the health of the receiver of the user equipment signaletique navigation systems "NAVSTAR and GLONASS its installation in civil aircraft and helicopters, reduction and strict accounting irregularity group delay time in the channel receiving and processing lettered frequencies NS system "GLONASS". 5 Il.

The invention relates to the field of satellite navigation and can be used in tracts primary data processing navigation user equipment (voltage) signals of global navigation satellite systems GPS NAVSTAR (USA) and GLONASS (Russia).

Known receiver of signals of navigation satellites (NS) signals GPS NAVSTAR and GLONASS [1], which contains an antenna, a low noise amplifier (LNA), diplexer, splitter signals, the reference OCXO, multistage frequency synthesizer, four-channel receiving module system "GLONASS", each of the channels which contains, in turn, the mixer (CM), intermediate frequency amplifier (if amplifier) and analog-to-digital Converter (ADC). This is due to the fact that each spacecraft system "GLONASS" radiates its signal carrier frequency. Device [1] also contains a six-channel receiver module GPS "NAVSTAR", which contains a mixer, an intermediate frequency amplifier and analog-to-digital Converter.

DOS is navigation systems system "GLONASS" and "NAVSTAR". It provides continuity and a high accuracy of the measurement vector of the navigation parameters of the receiver-indicators that use the receiver.

The disadvantage of the receiver [1] is a complex multistage frequency synthesizer that provides information processing NA system "GLONASS" by splitting the working frequency band into 4 sub-bands. This approach requires a substantial complication math software user equipment to ensure operational control switching of the working channels of the receiver. In addition, the use in the receiver [1] as an analog-to-digital Converter two-sided limit of the limiter and then converting the analogue - dial leads to energy losses, equal to 0.96 dB, and does not allow to compensate for the non-Gaussian interference, which are, for example, when installing navigation equipment consumers on highly dynamic objects (airplanes, helicopters, submarines and so on).

These drawbacks are partially eliminated in the receiver of the user equipment of satellite radio navigation sausilito, microwave switch (microwave switch), reference OCXO, driver grid reference frequency (FSOC), phase shifter, the first and second mixers, first, second and third bandpass filters (PF), the first and second intermediate frequency amplifiers, the first and second units for automatic gain control (AGC) and analog-to-digital Converter whose output serves as the output of the receiver.

Device [2] provides the possibility of simultaneous reception and processing in the operating frequency range of the signals spacecraft SRNS GLONASS and NAVSTAR", which allows high-speed and high-precision signal processing in various classes of navigation equipment of consumers.

However, as the experience of the development and operation of the device [2], simultaneous processing of signals from navigation satellites in a wide frequency band (f=48 MHz) requires to ensure the required accuracy of the instrument sampling rate of the ADC is equal to at least 100 MHz. Such a high value of the sampling frequency in the further processing of information in digital form requires special structural and technical measures to ensure the health of these properties [2], to CMOS or BI-CMOS) technology, on the basis of which implemented the nodes of other types of navigation equipment of consumers. This, in turn, leads to increased power consumption, dimensions, as well as to a significant appreciation of the navigation equipment of consumers.

The closest in technical essence to the invention is a receiver of the user equipment signals of global satellite navigation systems [3], which contains two antennas, two bandpass filter preselector, the first through third low-noise amplifiers, microwave switch, reference OCXO, the output of which is connected respectively to the outputs of the first and second shapers grid reference frequency, a phase shifter, the first to seventh mixers, the first-second intermediate frequency amplifiers, the first to third low pass filters (LPF), the first to fourth band-pass filters, the first through third amplifiers low frequency (ULF), the first and second blocks automatic gain control, the first through third analog-to-digital converters.

An advantage of the device of the prototype [3] is the ability to simultaneously receive and independent signal processing navigationrelated information and as a consequence, a significant reduction of the intermediate operating frequency and sample rate analog-to-digital converters.

The drawbacks of the prototype [3] are:

a) the lack of a special unit in the calibration receiver / amplifier tract that does not allow at any time automated monitoring of business continuity navigation satellite systems GLONASS and GPS NAVSTAR, as well as the operability of the navigation user equipment that does not meet one of the main requirements of the standard ARING-743A and fundamentally not possible to apply the device-prototype [3] for installation on civil and sports aircraft and helicopters;

b) in device-prototype [3] built-in antenna is automatically disabled when you connect an external antenna. However, when installing it on planes or helicopters in the event of an external antenna or embedded within it a low noise amplifier of the system voltage, which contains the device-prototype [3] , stops to determine the coordinates and speed of the aircraft on which it is installed, which significantly reduces the reliability of the onboard navigation system and, as a consequence, beama and processing of NS signals system "GLONASS" in-phase and quadrature channels of reception and processing of information requires first, a twofold increase in hardware costs, and secondly, the use of expensive filters with a linear phase-frequency characteristic to ensure minimal unevenness of group delay time (group delay) of the signal to the amplifying path. Experience shows that to minimize the group delay flatness even in the same channel, and to provide equality in two different receiving channels is a very difficult task. In the case of in-phase and quadrature components of the reception of the NA system "GLONASS" minimization and strict accounting irregularity group delay is almost impossible (especially for mass production) due to having identical electrical and constructive values of the two (in-phase and quadrature) channels for receiving and processing information signals NA "GLONASS".

In the inventive device achieved the possibility of solving the following problems:

- the possibility of calibration, automated monitoring of the integrity work of the national Assembly systems GLONASS and GPS NAVSTAR", and verify that the receiver of the user equipment signals NA global satellite navigation system that is compliant with ARING-743A and is of Stoletov:

- the presence of two independent receiving antennas allows a significant increase of reliability of work NAP (which uses the inventive device) when it is installed on a civil aircraft and helicopters, until security requirements categorized landing highest complexity;

- there is a possibility of reduction and strict accounting irregularity group delay in the channel of receiving and processing lettered frequencies NS system "GLONASS", which improves the precision characteristics of the measurement vector navigation parameters to the NRA, where it is used.

These advantages of the proposed device before the prototype is achieved due to the fact that the receiver of the user equipment signals of global satellite navigation systems containing two antennas, the inputs of which are the first and second information inputs of the receiver, two bandpass filter preselector, the first through third low-noise amplifiers, microwave switch, the control input which serves as the first control input of the receiver, the reference OCXO, the output of which is connected simultaneously to the inputs of the first and second shapers grid reference frequency, the first to fifth mixers,automatic gain control, the first and second low pass filters, first and second analog-to-digital converters, the outputs of which are respectively the first and second information outputs receiver inputs of the block calibrator, and the fourth intermediate frequency amplifier.

Moreover, the first and second control inputs of the block calibrator are respectively the second and third control inputs of the receiver and the clock input of block calibrator is connected to the output of the reference temperature-controlled generator. The output of the first antenna is connected to the input of the first filter preselector, the output of which is connected to the input of the first low-noise amplifier, the output of which is connected to the first information input of microwave switch, the second information input of which is connected to the output of the second low-noise amplifier, an input connected to the output of the second filter preselector, an input connected to the output of the second antenna.

The output of the microwave switch is connected to the first input of the third low-noise amplifier, and the second and third inputs of the third low-noise amplifier connected respectively to the first and second data outputs of block calibration, the output of the third low noise of usila connected to the first input of the first mixer, the output of which is connected to the input of the third bandpass filter connected to the output to the input of the first intermediate frequency amplifier, the output of which is connected to the first input of the second mixer, the output connected to the input of the fourth bandpass filter, the output of which is connected to the first input of the third mixer output connected to the input of the first low pass filter, the output is connected to the first input of the second amplifier intermediate frequency, direct and inverted outputs of which are respectively connected to the first and second information input of the first analog-to-digital Converter.

Direct the output of the second intermediate frequency amplifier connected to the input of the first block automatic gain control, the output of which is connected simultaneously to the second input of the first intermediate frequency amplifier and the second input of the second intermediate frequency amplifier, the first output of the first driver grid reference frequency is connected to the second input of the first mixer, the second output of the first driver grid reference frequency connected to the second input of the second mixer. The third output of the first driver grid reference frequency is connected with the second I is the input of the first analog-to-digital Converter, moreover, the output of the second bandpass filter connected to the first input of the fourth mixer output connected to the input of a fifth bandpass filter output connected to the first input of the third intermediate frequency amplifier, the output of which is connected to the first input of the fifth mixer output connected to the input of the second low pass filter, the output of which is connected to the first input of the fourth amplifier intermediate frequency, direct and inverted outputs of which are connected respectively to the first and second information input of the second analog-to-digital Converter.

Direct the output of the fourth intermediate frequency amplifier connected to the input of the second block automatic gain control, an output connected to second inputs of the third and fourth intermediate frequency amplifiers, and the first output of the second driver grid reference frequency is connected to the second input of the fourth mixer, a second output of the second driver grid reference frequency is connected with the second input of the fifth mixer, the third output of the second driver grid reference frequency is connected to the control input of the second analog-to-digital Converter of the receiver AP is retene explain the drawings, and:

in Fig. 1 presents a functional diagram of the receiver of the user equipment signals of global satellite navigation systems;

in Fig.2 is a functional block diagram of the calibrator;

in Fig.3 is a structural diagram of the first driver grid reference frequency;

in Fig.4 is a structural diagram of the first multi-stage frequency divider;

in Fig.5 is an embodiment of the host analog-to-digital Converter.

According to the invention, the receiver of the user equipment signals of global satellite navigation systems (Fig.1) includes an antenna 1, the output of which is connected to the input of the broadband filter preselector 2, the output connected to the input of the first low-noise amplifier 3, the output connected to the first information input of microwave switch 4. The second information input of the microwave switch 4 is connected to the output of the second low-noise amplifier 5, whose input is connected to the second output of the broadband filter preselector 6, the input connected to the output of the second antenna 7. Antenna selection (marked in Fig.1 number 1 or number 7), which in the i-th time is the reception and processing of the national Assembly, by submitting potentially is, the rich, if the control input of the microwave switch 4 receives the signal of the logic unit, the inventive receiver receives the signal processing of the national Assembly with antenna 1, and if the control input unit 4 receives a signal of logical zero, the reception and processing of signals NA in the inventive device is performed via the antenna 7.

The output of the microwave switch 4 connected to the first input of the third low-noise amplifier 8, the second and third inputs of which are connected respectively to the first and second outputs of block 9 of the calibrator. The first and second inputs of the control unit 9 of the calibrator are respectively the second and third control inputs of the receiver. The LNA output 8 is connected simultaneously to the inputs of the first bandpass filter 10 and the second band-pass filter 11. The output of bandpass filter 10 connected to the first input of the mixer 12. The output of mixer 12 is connected to the input of the third bandpass filter 13 connected to the output with the first input of the first amplifier 14 intermediate frequency, the output of which is connected to the first input of the second mixer 15, the output connected to the input of the fourth bandpass filter 16. The output of bandpass filter 16 connected to the first input of the third mixer 17, the output connection of the filling frequency, direct and inverted outputs of which are connected respectively with the first and second information input of the first analog-to-digital Converter 20. Direct the output of amplifier 19 is also connected to the input unit 21 automatic gain control, the output of which is connected simultaneously to the second input of the amplifier 14 and the second input of the amplifier 19.

The second input of the mixer 12 is connected to the first output of the first driver 22 grid reference frequency, a second output of which is connected to the second input of the mixer 15, the third output to the second input of the mixer 17, the fourth output to the control input of the analog-to-digital Converter 20. The input of the first driver 22 grid reference frequency is connected simultaneously to the output of the reference temperature-controlled oscillator 23, the input of the second driver 24 grid reference frequency and a clock input unit 9 calibrator. The output of the second bandpass filter 11 is connected to the first input of the fourth mixer 25. The output of the fourth mixer 25 is connected to the input of a fifth bandpass filter 26, the output connected to the first input of the third amplifier 27, the output connected to the first input of the fifth mixer 28. The output of mixer 28 is connected to the input of the second low-pass filter 29, an output connected to the input of maximizing the WMD information to the second inputs of the ADC 31. Direct the output of amplifier 30 is connected also to the input of the second block 32 automatic gain control, an output connected to second inputs of the intermediate frequency amplifiers 27 and 30. The outputs of the ADC 20 and 31 serve as the first and second information outputs of the claimed device. The first output of the second shaper 24 grid reference frequency is connected to the second input of the mixer 25, the second to the second input of the mixer 28, the third to the control input of the ADC 31.

Unit 9 calibrator (Fig.1 and 2) contains the phase modulators 33 and 34, the first inputs of which are respectively the second and third control inputs of the proposed receiver, the phase detector 35, the first input of which is connected simultaneously to the output of the reference temperature-controlled oscillator 23 and the inputs of the first 22 and second 24 shapers grid reference frequency, respectively. The output unit 35 is connected to the output of the low pass filter 36, the output connected to the input of the generator 37, voltage-controlled (VCO). The output of VCO 37 is connected to the input of the multistage frequency divider 38, the first output of which is connected to the second input of phase detector 35. The second and third outputs of the multistage frequency divider 38 is connected to the second inputs of the block of the public to the first and second inputs of the attenuator 39, the first output of which is connected to the input of the first ferrite valve 40, the second output to the input of the second ferrite valve 41. The output of the first ferrite valve 40 is connected to the second input of the LNA 8, and the output of the second ferrite valve 41 is connected to the third input of the LNA 8.

Shaper 22 grid reference frequency (Fig.1, 3) contains a pulse phase detector 42 and the frequency detector 43, the first inputs are connected together and connected to the output of the reference temperature-controlled oscillator 23. The outputs of blocks 42 and 43 are connected to first and second inputs of the adder 44, the first and second outputs of which are connected to control inputs of the keys 45 and 46. The second control inputs of the keys 45 and 46 are connected respectively to the positive potential of the supply voltage and the ground potential. The outputs of the keys 45 and 46 connected together and connected to the filter input 47 of the lower frequencies, supporting, thus, at the input of the specified filter stable input current. The output of the lowpass filter 47 is connected to the input of the generator 48, voltage-controlled, the output of which is connected simultaneously to the mixer 12 and to the input of a multistage divider 49 frequency, the first output of which is connected to the second inputs of blocks 425, the third output to the mixer 17, the fourth to the control input of the ADC 20.

Multistage divider 49 frequency (Fig.2 and 4) contains the counter-divider (N=5) 50, a clock input connected to the output of the VCO 48 is input multistage divider 49 frequency. The output of the counter-divider 50 is connected simultaneously to the clock inputs t of the flip-flop 51, the counter-divider (N= 9) 52 and the counter-divider (N=28) 53. The output of the VCO 48 is connected with a clock input of the counter-divider (N= 56) 54. The output of the T flip-flop 51 is connected to the input of the mixer 15, the output of the counter-divider 52 is connected to the input of the mixer 17, the output of the counter-divider 53 is connected with the second input pulse phase detector 42 and the frequency detector 43, respectively. In addition, the output of the counter-divider 54 is connected to the control input of analog-to-digital Converter 20.

Note that the shaper 24 grid reference frequency has a similar structure and composition of units and differs only in the ratings generated by the reference frequency.

Analog-to-digital Converter 20 (Fig.1 and 5) includes Comparators 55 and 56, the integrator 57, item, OR 58. The first input of the comparator 55 is connected to the direct output of the amplifier 19 intermediate frequency, inverted output, the placenta is and it is connected also to the first input of the OR element 58. The output of comparator 56 is the second output of the first information channel receiver (output I2), and it is connected with the second input element OR 58. The output of the OR element 58 is connected to the input of the integrator 57, the output of which is connected both to the second inputs of the Comparators 55 and 56. The third (control) inputs of the Comparators 55 and 56 connected to the corresponding output driver 22 grid reference frequency.

Note that the ADC 31 has a similar structure and composition of the elements.

The inventive device operates as follows. The input of the antenna 1 to the receiver receives signals of the navigation satellites of the satellite navigation systems GLONASS and NAVSTAR" Si(t), which in General have the form

< / BR>
where A(t) is fluctuating at the point of reception of the signal amplitude NS;

Pi(t) - pseudo-random envelope signal of the i-th NS;

Di(t) is the navigation message of the i-th NS;

i- carrier frequency of the i-th NS;

i- the value of the Doppler frequency shift;

t - current time;

i- the initial phase of the carrier of the i-th NS;

Cthe time delay on the highway distribution of NS - user.

Amplitude-frequency response of the receive path salaeste" when working on the code of General application With the/And is 1575,421,023 MHz, and the range of frequencies of signals of the NA system "GLONASS" when working on code, reduced accuracy (PT) is 1602-1617 MHz. This means that the total bandwidth of the received signals are equal 1574,4f1617 MHz, i.e., the occupied bandwidth f is approximately 43 MHz.

From the output of the antenna 1 signal is fed to the input of the broadband filter preselector 2, which serves to limit the bandwidth of received signals in the range 1574,4-1617 MHz. The specified filter, which can be performed, for example, on a three-dimensional dielectric resonators, implements a Butterworth approximation or kawara with a linear phase-frequency characteristic (PFC) in the passband, while the order of the filter is equal to four. In order to meet the standard ARING-743A, he must ensure the attenuation at frequencies f1,525 GHz at least 30 dB, and at frequencies f1,625 GHz at least 35 dB. From the output of the filter 2, the signal is fed to the input of a low noise amplifier 3, where the preamp signal, which is then routed to the first input of microwave switch 4. The microwave switch 4, which may be performed, for example, on p-i-n diodes, provides the opportunity to work for one of the antennas (indicated in Fig.1 number 1 or namespacemap, by submitting a potential signal (logical zero or one) with the CPU voltage, which uses the inventive receiver.

In the case of the antenna 1 to the control input of the microwave switch 4 signal logical units, and the units 5, 6 and 7 are disabled. If the control input unit 4 filed logical zero, disables the blocks 1, 2 and 3, and the output of the antenna 7, the signal is fed to the input of the broadband filter preselector 6, purpose, type and parameters of which are similar to the filter 2. From the output of the filter 6, the signal is fed to the input of a low noise amplifier 5, which functions similar to the functions of the device 3. Low-noise amplifiers 3 and 5 is made on the basis of gallium arsenide transistors with Schottky barrier. The parameters of the LNA 3 and 5 are as follows: a gain of 35 dB, the range of acceptable frequencies 1-8 GHz with uneven amplitude-frequency characteristics 1 dB and the noise figure of 1.5 dB. The LNA output 5 is connected to a second input of the microwave switch 4. The parameters of the microwave switch 4, which is made on the basis of p-i-n diode type AA, are as follows: band a valid operating frequency 0.6 to 9 GHz, the losses of the transmission of the open channel 1.5 dB, the standing wave ratio equal to 1.8.

what s which is similar to the LNA 3 and 5. It is designed to further enhance the received signals NA global space system "GLONASS" and "NAVSTAR".

Output LNA 8 signals of two systems are processed in separate channels. Such processing is provided by selecting the corresponding nominal frequency input to the mixers, and filters parameters receiver / amplifier circuits signal processing.

The signal received at the first inputs of bandpass filters 10 and 11, occupies a bandwidth in the range 1574,4-1617 MHz. The purpose of the bandpass filter 10 is the formation of the operating frequency channel of receiving and processing signals of the GPS system "NAVSTAR" with a bandwidth of 1574,4-1576,4 MHz.

For this purpose, the bandpass filter 10, which is implemented on a three-dimensional dielectric resonators, provides the following characteristics: center frequency f0=1575,1 MHz, f (minus 3 dB)=1574,4-1576,4 MHz, the guaranteed attenuation at the frequency of 1,525 GHz is 30 dB, at a frequency of 1,595 GHz 28 dB. From the output of bandpass filter 10, the signal at the first input of the mixer 12. From the first output PSOC 22 to the second input of the mixer 12 receives a signal frequency of 1400 MHz. Thus, at the output of mixer 12 is formed by a differential signal cassavoy filter 13. Using a bandpass filter 13 of the inventive device produces the further development of a range of operating frequencies of the NA system "NAVSTAR", as well as filtering by-products conversion mixer 12. For this purpose, as the bandpass filter 13 is used, the filter approximation of kawara 4 order.

Further useful signal is amplified by amplifier 14 and supplied to the first input of the mixer 15, the second input is from the second output PSOC 22 enters the frequencies equal to 140 MHz. At the output of mixer 15 is formed spectrum signals of the NA system "NAVSTAR" in the range of 34.4-36,4 MHz, which passes through the bandpass filter 16, which are filtered by-products conversion mixer 15 (useful signal in the range of 34.4-36,4 MHz passes through the filter with little or no loss). From the output of block 16 is useful converted signal is supplied to the first input of the mixer 17, the second input of which comes the reference signal with PSOC 22, is equal to fg=31,1 MHz. At the output of mixer 17 is formed a useful signal in the low frequency range, 3,3-5,3 MHz, which is supplied to the lowpass filter 18 with cutoff frequency fc=5,3 MHz, from which the filtered signal passes to the input of the redundancy gain signal within the specified range is used, the block 21 automatic gain control, which covers the intermediate frequency amplifiers 14 and 19.

With direct and inverse outputs of the amplifier 19 intermediate frequency converted and amplified signal is supplied to the first and second information inputs of the ADC 20. After analog-to-digital conversion on the outputs I1 and I2 ADC 20, which serve as the first informational outputs of the proposed receiver, the generated digital samples converted input signal NS GPS "NAVSTAR".

In the second information channel signal processing is carried out as follows. Output LNA 8 signal with a bandwidth of 1574,1-1617 MHz is fed to the input of bandpass filter 11, the purpose of which is the formation of the working frequency of the receive channel and signal processing system "GLONASS" working on PT code with bandwidth 1602-1617 MHz. To solve this problem bandpass filter 11, which is implemented on a three-dimensional dielectric resonators, provides the following specifications: center frequency f0=1608,5 MHz, f (3 dB)=1602-1617 MHz, the guaranteed attenuation at the frequency 1590 MHz is 30 dB, and the frequency of 1625 MHz 35 dB.

From the output of the band pass filter 11, the signal at the first input to the mixer 25. With the first myhotsites 25 produces a signal of the difference frequency fl= fc-fgoccupying a frequency spectrum in the range 23-38 MHz, which is fed to the bandpass filter 26. Using a bandpass filter 26 of the inventive device produces the further development of a range of operating frequencies of the NA system "GLONASS" and filtering by-products of the conversion of the mixer 25. For this purpose, the bandpass filter 26 is implemented on the basis of approximation of kawara 4 order. Further useful signal is amplified via amplifier 27 and is supplied to the first input of the mixer 28, the second input is from the second output FSOC 24 reaches the frequencies equal to 45.5 MHz. At the output of mixer 28 is formed spectrum signals of the NA system "GLONASS" in the range of 7.5 to 22.5 MHz, which passes through the lowpass filter 29 with cutoff frequency fc=23 MHz, the output of which the filtered signal passes to the input of the amplifier 30 intermediate frequency, which is used for further signal amplification NA system "GLONASS". For the permanence of the gain of the signal within the specified limits used block 32 automatic gain control, which covers the intermediate frequency amplifiers 27 and 30, respectively (depth adjustment AGC blocks 21 and 32 is 25 dB). With priamary and second information inputs of the ADC 31. On the control input of the ADC 31 from the third output FSOC 24 signal frequency 51,25 MHz. After analog-to-digital conversion on the outputs I1 and I2 ADC 31, which serve as the second information outputs of the claimed device are formed of digital samples converted input signal NS system "GLONASS".

Dignity ADC 20 and 31 is the property of adaptability, i.e., the threshold voltage levels, which compares the input signals when the digitization is not fixed, and are formed by logical exclusion on OR and integration. This property ADC allows you to increase or decrease the threshold comparison based on spectral properties of the input signal. This implementation significantly increases the noise immunity of the system when exposed to a harmonic (non-Gaussian) or concentrated impulse noise.

To ensure the implementation of the requirements of the standard ARING-743A to the navigation apparatus of consumers that are installed on a civil aircraft and helicopters, in terms of ensuring the integrity of the space segment and the health of EmOC in the inventive device, the entered block calibrator 9, which works as follows. The ring phase-locked loop Thu constant issue on the first and second outputs of the divider 38 frequency 1610 MHz (corresponding to the frequency a member of the working width of the NA system "GLONASS") and 1575 MHz (included in the working range of the signals of the navigation satellites of the GPS system "NAVSTAR"). Note that at the first input of phase detector 35 is continuously applied input signal frequency 10 MHz output reference temperature-controlled oscillator 23. The signal frequency 1610 MHz is supplied to the first input of the phase modulator 33, and the signal frequency 1575 MHz is supplied to the first input of the phase modulator 34. In the i-th moment of time when the voltage that is installed on Board a civilian aircraft or helicopter, it is necessary to carry out control of receiving and amplifying path or to verify the integrity of the work of the national Assembly systems GPS NAVSTAR or GLONASS, the CPU of the navigation user equipment instructs the signal processor to issue modulating a pseudo-random sequence, which frequency 0,511 MHz (channel "GLONASS") or 1.023 MHz (channel GPS NAVSTAR") is supplied to the control input 2 or input 3 receiver, respectively (Fig.1 and Fig.2).

Select channel receiver, to be verified through software-software OAD. Thus, at the output of the phase modulator 33 or 34 is formed photomodeler 39, the output is a fixed power level signal, guaranteeing receiving and amplifying channel NA systems GLONASS and GPS NAVSTAR" from self-excitation, and also allows you to safely perform their search prematurelyare NAP (usually his power level is equal to minus 125 dBW). Output calibrated signal channel of the NA system "GLONASS or GPS NAVSTAR" (depending on whether the receive channel to be checked in the i-th time) is output ferrite valve 40 or ferrite valve 41, respectively. Ferrite valves 40 and 41 serve to reconcile the wave resistance of the output circuit block calibrator 9 wave impedance of the second and third inputs of the LNA 8, to which are connected the outputs of ferrite valves 40 and 41, respectively.

Compared with the device-prototype [3] in the inventive receiver of the user equipment signals of global satellite navigation systems achieved the following benefits:

1. Introduction block calibrator 9 allows at any time the integrity and health of the receiving amplifier channel and data channels NAB, in General, that the disorder in the structure of EmOC, working on civil aircraft and helicopters.

2. Introduction block calibrator 9 allows rigorous evaluation and accounting software and mathematical provide EmOC values uneven group delay time , which is especially important for the NS system "GLONASS". Experience with device-prototype [3] shows that if the flatness group delay filters with linear phase characteristics in the path of the signal processing of the NA system "GLONASS" can be taken into account by calculation, when mass production and the aging voltage during operation without block 9 practically it is not possible to strictly consider the total time delay of signal propagation in the receiver, which significantly reduces the accuracy of vector navigation parameters to the NRA (coordinates, speed and time).

3. The introduction of two independently operating antennas, switched on the CPU voltage, allows to significantly improve the reliability of EmOC installed on civil and sport airplanes and helicopters (in case of damage or complete failure of one there is always the possibility of switching to a spare antenna), and secondly, when the exercises, icing, etc. NAP produces is obviously untenable measurement options.

4. Disclaimer the availability of in-phase and quadrature components in the receiving channels navigation satellite system GLONASS significantly improves the manufacturability of the claimed device before the device prototype [3] in mass production, reduces the error in the determination of irregularity group delay (approximately 20%), and reduces by about a third apparatus costs for the technical implementation of the claimed device.

Thus, all tasks set before the invention is made.

Sources of information

1. Raymond A. Eastwood "Anintegrated GPS/Glonass receiver". - "Navigation" (USA), 1990, 2, pp.141-151.

2. M. Basyuk, P. A. Sturgeon, C., Sirenko, A. M. Smugly. The receiver of the user equipment signals of global satellite navigation systems. - The patent of the Russian Federation 2067770.

3. M. Basyuk, E. I., Otanadze, C. Y. Sadyrin, A. M. Smugly. The receiver of the user equipment signals of global satellite navigation systems. - The patent of the Russian Federation 2100821.

The receiver of the user equipment signals of global satellite navigation systems containing two antennas, the inputs of which are the first and second information inputs of the receiver, two bandpass filter preselector, first - Ohm control receiver, reference OCXO, the output of which is connected simultaneously to the inputs of the first and second shapers grid reference frequency, the first to fifth mixers, the first to fifth bandpass filters, the first - second intermediate frequency amplifiers, the first and second blocks automatic gain control, the first and second low pass filters, first and second analog-to-digital converters, the outputs of which are respectively the first and second information outputs of the receiver, characterized in that it additionally introduced block calibrator, and the fourth intermediate frequency amplifier, moreover, the first and second control inputs of the block calibrator are respectively the second and third control inputs of the receiver, and the clock input of block calibrator is connected to the output of the reference temperature-controlled oscillator, the output of the first antenna is connected to the input of the first filter preselector, the output of which is connected to the input of the first low-noise amplifier, the output of which is connected to the first information input of microwave switch, the second information input of which is connected to the output of the second low-noise amplifier, an input connected to the output of the second filter preelectorales amplifier, moreover, the second and third inputs of the third low-noise amplifier connected respectively to the first and second data outputs of block calibrator, the output of the third low-noise amplifier connected simultaneously to the inputs of the first and second bandpass filters, the output of the first bandpass filter connected to the first input of the first mixer, the output of the first mixer is connected to the input of the third bandpass filter connected to the output to the input of the first intermediate frequency amplifier, the output of which is connected to the first input of the second mixer, the output connected to the input of the fourth bandpass filter, the output of which is connected to the first input of the third mixer output connected to the input of the first low pass filter, output terminal connected to the first input of the second amplifier intermediate frequency, direct and inverted outputs of which are respectively connected to the first and second information input of the first analog-to-digital Converter, and direct the output of the second intermediate frequency amplifier connected to the input of the first block automatic gain control, the output of which is connected simultaneously to the second input of the first amplifier intermediate cash frequency is connected to the second input of the first mixer, the second output of the first driver grid reference frequency connected to the second input of the second mixer, the third output of the first driver grid reference frequency is connected with the second input of the third mixer, the fourth output of the first driver grid reference frequency is connected to the control input of the first analog-to-digital Converter, and the output of the second bandpass filter connected to the first input of the fourth mixer output connected to the input of a fifth bandpass filter output connected to the first input of the third intermediate frequency amplifier, the output of which is connected to the first input of the fifth mixer output connected to the input of the second low pass filter, the output of which is connected to the first input of the fourth amplifier intermediate frequency, direct and inverted outputs of which are connected respectively to the first and second information input of the second analog-to-digital Converter, and a direct output of the fourth intermediate frequency amplifier connected to the input of the second block automatic gain control, an output connected to second inputs of the third and fourth intermediate frequency amplifiers, and the first output is showing driver grid reference frequency is connected with the second input of the fifth mixer, the third output of the second driver grid reference frequency is connected to the control input of the second analog-to-digital Converter of the receiver of the user equipment signals of global satellite navigation systems.

 

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