Method to determine intolerable abnormality of received navigation satellite signals and device to this end

FIELD: physics.

SUBSTANCE: proposed method comprises reception of radio signals, analysis of output data of a group of receivers in combination with the data of weather pickups, and generation of navigation data quality signals and corrections to said data for its consumers.

EFFECT: higher probability of detecting intolerable abnormality of navigation satellite signals coming from all operated navigation systems GLONASS, GPS and GALILEO.

2 cl, 1 dwg

 

The invention relates to the field of global satellite navigation, more precisely to the problem of the use of navigation satellite signals for reliable navigation civil aviation.

There is a method of positioning objects in space (land, oceans, etc. using the global navigation systems GLONASS, GPS and GALILEO (see the book GLONASS, Izd-vo "radio engineering", M., issue 3, edited by Ahipara and Vinaria, 2005), including the reception of signals from multiple navigation satellites (NS) a special satellite receiver, which calculates the geographic coordinates of its location.

In the same source disclosed device, satellite receiver, containing the antenna and the RF modules and digital aggregation, as well as the evaluator performing the calculation of the geographic or map coordinates of the location of this receiver.

There is a method now widely used everywhere from the most complex military systems to simple car and tourist navigators. However, with all its progressive (even revolutionary) value for the development of many areas of human activity, he has a very serious drawback associated with the probability of a sudden decrease in the reliability of satellite navigation information in Loti to false. And the point here is not that produced in large quantities for wide use cheap satellite receivers have a relatively large error in the determination of the coordinates (of the order of several hundreds of meters), exacerbated by natural fluctuations in the environment (temperature, humidity and ionization)that affect the propagation of radio signals, and not even that for the use of satellite navigation systems high precision is still required the permission of the military authorities, and that the military authorities, managing their NA, at any time for their own purposes, you may change the settings navigation satellite systems forming unacceptable anomaly signals NA, not giving any guarantees for passive consumers of these signals. This is of course bad for the tourists who use the Navigator at the wrong time, the consequence of which may be an error in the choice of route and wasted time that could be fixed. But the use of satellite navigation information in the wrong time in civil aviation can lead to disaster. Therefore require special operational methods and tools that can accurately measure and account invalid anomaly signal NS.

The closest to the technical nature of the claimed method is a method described in utility model "apparatus for forming the mandrel in the navigation system" (Patent # 39701 IPC 7 G01C 21/24 2004, bull. No. 22, dated 10.08.2004, including the reception of radio signals NS connected in series through the antenna module, the distributor of radio signals and a group of receivers, with each receiver carry out the amplification of radio signals NA, their selection of useful component of a mixture of noise and the transformation of the pure signal with high frequency on the intermediate with an RF module, followed by analog-to-digital conversion by the ADC, and then perform analysis on the transmitter output of a group of receivers together with the data of meteorological sensors (temperature, pressure and humidity of air and the production of quality signals navigation information and amendments to consumers.

The closest to the technical nature of the claimed device is the device described in the above utility model containing consistently connected the antenna module, the distributor of radio signals, the group of satellite receivers with radio frequency channel and digital processing, computer, and group outputs transmitter for transmitting information to consumers, as well as the module of meteorological sensors, a group of outputs which are connected to the respective group of inputs of the transmitter.

A disadvantage of the known method and device is relatively low probably is th definition using them unacceptable anomalies received signals NA, because this definition is based on the simple use of the control (duplicate) of the receiver. Another anomaly signal NS (equal to such failure of the receivers), which would not be detected by the evaluator with relatively simple signal analysis without deep their correlation processing. The issue is aggravated by the fact that the known method and device is focused on the control of signals received NA only one of the three existing navigation systems (up to the present time, mainly GPS). However, currently, the civil aviation sectors are increasingly using other systems, such as GLONASS and GALILEO. However because of the limited capacity on the weight and size parameters of the receivers on Board civil (and military) aircraft, as a rule, do not install high-performance receivers for all three navigation systems.

The aim of the invention is to increase the probability of unacceptable anomalies received signals NA simultaneously from all existing navigation systems GLONASS, GPS and GALILEO by using high-precision fixed ground control station (SCS) with pre-cisely defined parameters of its location and by the precision of the correlation signal processing of the national Assembly.

Pointed to by the I objective is achieved by the method of determination of invalid anomalies received signals of navigation satellites (NS), including the reception of radio signals NS connected in series through the antenna module, the distributor of radio signals and a group of receivers, with each receiver carry out the amplification of radio signals NA, their selection of useful component of a mixture of noise and the transformation of the pure signal with high frequency on the intermediate with an RF module, followed by analog-to-digital conversion by the ADC, and then perform analysis on the transmitter output of a group of receivers together with the data of meteorological sensors (temperature, pressure and humidity of air and the production of quality signals navigation information and amendments to its consumers, and that the specified method is carried out using a fixed ground control station (SCS), containing in its composition as a group of receivers such their set n is structurally integrated in the block satellite receivers (BSP), which, having redundant receivers, receives the radio signal NS from satellite navigation systems GLONASS, GPS and GALILEO and carries out their digital statistical processing using programmable correlators, thus before you begin the COP provide engineering inputs in memory of her computer on the exact geographical dislocation SCS and modes of operation, and in the control register module control each receiver - operating modes and its correlator, and then in the process of SCS carry out the simultaneous reception of signals of all the national Assembly, located within the footprint of, and correlation signal processing NS for each navigation satellite systems operate on the group of his m-channel receivers for each of the NS separately in their respective channel at its correlator having in advance before you begin the programmed data structure of the ranging code and the time delay his initial front, the provisional size of the gate correlation accumulation, frequency and initial phase of the harmonic signal and the frequency of the clock cycles, in the result of correlation processing in real time in the output drive of each correlator is fixed with reference to the system a single time with a given probability of correct detection for each NS in the area within range of each satellite navigation system delay the passage of the ranging code from each NS to SCS, then the evaluator compares the output received from the BSP, so that for the same current fixed point in time get estimates geographical coordinates SCS received is based taken from different satellite navigation systems, when they match with each other and with the control data of the dislocation of the SCS produce a decision about health specific NA all three navigation systems, and in the mismatch state is invalid anomaly signals corresponding to the NA of the respective systems.

This goal is achieved by the fact that the device definition is invalid anomalies received signals NA, containing consistently connected the antenna module, the distributor of radio signals, the group of satellite receivers with radio frequency channel and digital processing, computer, and group outputs transmitter for transmitting information to consumers, as well as the module of meteorological sensors, a group of outputs which are connected to the respective group of inputs of the transmitter, also the fact that the device is a fixed ground control station (SCS), the antenna module which contains several broadband antennas with their low-noise high-frequency amplifier, providing uniform radio reception given range from the whole sky, and the satellite group receivers represents a set of them, is structurally integrated in the block satellite receivers (BSP). which includes a receiver receiving radio signals simultaneously from a navigation satellite systems GLOBAL is ACC, GPS and GALILEO, while BSP for each of these systems contains a group of receivers, reserve them, and each receiver is a 24-channel pinning each channel for one of the NA, and each channel contains a radio frequency module, ADC control module receiver in the generators of harmonic signals, the ranging code, synchrotact, gate accumulation and signal delay, programmable correlator comprising eight multipliers, three-digit shift register and six independent drives, the group of information outputs and the inputs of the engineering inputs, the input and output of the radio frequency module connected to respective output distributor of radio signals and to the first input of the ADC, the output of which is connected with the first inputs of the first and second multipliers, the second inputs of which are connected respectively to the outputs of the sin and cos generator harmonic signals, the output of the first multiplier is connected with the first inputs of the third, fourth and fifth multipliers and the output of the second multiplier connected to the first inputs of the sixth, seventh and eighth multipliers, the second inputs of the third and the sixth multiplier connected to the output of the first discharge shift register (SR), the output of the second category which is connected with the second inputs of the fourth and seventh multiplier, and the output of the third p which would be loaded on the CF is connected with the second the inputs of the fifth and eighth multiplier, the outputs of the third, fourth, fifth, sixth, seventh and eighth multipliers are connected to the appropriate information inputs drives the first and second control inputs which are connected respectively to the outputs of the clock and gate generator accumulation, the generator output of the ranging code is connected with the information input SR input shifts which is connected to the input of ADC clock cycles and the output clock, the output of the signal generator delays connected to the input control clock, a group of engineering inputs inputs, which is the group of control inputs of the channel of the receiver, is a group of input devices, the group of information outputs drive each channel of each receiver through a single local area network connected to the group of information inputs of the transmitter.

The technical result of the invention consists in the simultaneous monitoring of the condition of all existing navigation systems (GLONASS, GPS and GALILEO) with the definition of unacceptable anomalies received signals NS with a higher probability than in the prototype (approximately 10%), using high-precision ground-based JCB with in advance just installed the coordinates of its location and use for signal processing NS programmable correlators.

The drawing shows a flowchart of the device definition is invalid anomaly signal NS.

The device contains a serial connected the antenna module 1 with broadband antennas 1.1.1,...h and low-noise high-frequency amplifier 1.2.1,...h, the dispenser 2 signals with matching resistors 2.1, 2.2, 2.3, ... 2, block group 3 satellite receivers, consisting of n satellite receivers 3.1, ... 3.n, each of which consists of m channels 3.1.1, ... 3.1.m, the transmitter 4 and group 5 transmitter for transmitting information to consumers, and module 6 of meteorological sensors.

In turn, the first channel of the first receiver module contains 7 control register 7.1 control, generator 7.2 harmonic signal generator 7.3 the ranging code, the clock 7.4, generator 7.5 gate accumulation, generator 7.6 signal delay and clock 7.7 single time, programmable correlator 8 with eight multipliers 8.1, ... 8.8, shift register 8.9 and independent drives 8.10, 8.15..., a radio frequency module 9, the ADC 10 and group 11 inputs engineering inputs. For other channels and receivers in the same way. The device has a local area network (LAN) 12.

The group of outputs of meteorological sensors 6 are connected to the respective group of inputs of the transmitter 4, the input and output of the radio frequency module 9 is connected with the corresponding output of the distributor of radio 2 and to the first input of the ADC 10, the output of which is about connected with the first inputs of the first 8.1 and 8.2 second multipliers, the second inputs of which are connected respectively to the outputs of the sin and cos generator 7.2 harmonic signals, the output of the first multiplier 8.1 is connected with the first inputs of the third 8.3, fourth 8.4 and fifth 8.5 multiplier and the output of the second multiplier 8.2 is connected with the first inputs of the sixth 8.6, seventh 8.7 and eighth 8.8 multipliers, the second inputs of the third 8.3 and sixth 8.6 multiplier connected to the output of the first discharge shift register (SR) 8.9, the output of the second category which is connected with the second inputs of the fourth 8.4 and seventh 8.7 multiplier, and the output of the third discharge WED 8.9 connected with the second inputs of the fifth and 8.5 eighth 8.8 multipliers, the outputs 8.3 third, fourth 8.4, fifth 8.5, sixth 8.6, seventh 8.7 and eighth 8.8 multipliers are connected to the appropriate information inputs independent drives 8.10, 8.15..., first, second and third control inputs which are connected respectively to the outputs of the clock 7.4, generator 7.5 gate accumulation and 7.7 hours single time, the generator output 7.3 the ranging code is connected with the information input of SR 8.9, the sign of shifts which is connected to the input 10 ADC clock cycles and clock 7.4, the generator output 7.6 of the delayed signal is connected to the control input clock 7.4, group 11 inputs engineering inputs, which is the group of control inputs of the given PE the first channel 3.1.1 first receiver 3.1, is a group of input devices, the group of information outputs independent drives 8.10, 8.15 ... first and every other channel of each receiver through a single local area network connected to the group of information inputs of the transmitter 4, a group of engineering inputs inputs relating to group 11 of the input device.

The method is as follows. Before you begin SCS installed at a given point of dislocation, through a group of 11 inputs (figure 1) provide engineering inputs in the memory of the computer 4 on the exact geographical location of this SCS. At the same time in case 7.1 module control 7 control each channel 3.1.1, ... each receiver 3.1, ... provide engineering inputs operation mode. In the simplest case, the connectors group 11 inputs insert appropriate regime map, and in a more complex case, allowing the reconstruction modes, instead of the regime cards connected computer.

Evenly distributed in space over the earth and rotating around it in their orbits at high altitude (e.g., GLONASS 20000 miles over the globe) navigation satellites (NS) GLONASS (18 NS), GPS (24, NS) and GALILEO (30 NS) continuously and synchronously for all NA this system radiate to the ground, covering its entire surface corresponding to each system navigation radish is Aly, representing for each NS recurring time complex radiopacity resulting from digital modulation of the original harmonic oscillations (carrier frequency component of the hundreds of megahertz) code sequence of the so-called ranging code. In addition to the ranging code is the most important component of the transmitted NS information in radiopacity also contains information about the parameters of the motion of the national Assembly, their numbers and location values of a single time and the other Below in the present technical solution, the Central place is occupied by exactly the ranging code, which, being accepted by the receiver from a few NS with reference to the unified time system (CTS), allows to calculate the geographical coordinates of the location of the receiver, and in advance of known response (location SCS known) it is possible by a simple comparison using the computer 4 does not only determine the correctness of the solution of the problem in General, but in terms of redundancy receivers, the national Assembly and the systems of the national Assembly, to define unacceptable anomalies of radio signals, as well as to localize faults and failures of each of these parts. The reception of radio signals NA is connected in series through the antenna module 1 (figure 1), the dispenser 2 radio and BSP 3. Initially, n is each receiver 3.1, ... 3.n parallel (below, for example, is considered to receiver 3.1 intended for first NA of the GLONASS system, for others similarly) is carried out using a radio frequency module 9 amplification of radio signals NS, frequency selection signals of the first NS of a mixture with noise and interference and conversion of radio signals with high frequency on intermediate. Then send the signals to the intermediate frequency by the ADC 10 is sequentially converted from analog form to digital form suitable for further statistical processing of multiple adjacent parcels of radio signals using a programmable correlator 8 and then the transmitter 4.

ADC output 10, performs the function of amplitude quantization of the signal received on each step of quantization (the higher frequency cycles - the more accurate treatment) counts related to one of the current parcels ranging code signal NS, using the correlator 8 is matched with artificially generated by the generator 7.3 (leading, unbiased and trailing) are known in advance of the ranging code that is written in the shift register (SR) 8.9. The mapping is bit-parallel multipliers 8.3, ...8.8 for rapid, unbiased and trailing ranging code taken from the corresponding CF 8.9 with regard to phase coherent the CSOs and incoherent signal, produced by the generator 7.2 harmonic signals in multipliers 8.3,...8.8 through multipliers 8.1 and 8.2. Find the coincidence counts of the real signal with artificially generated the expected signals from the outputs of the multipliers are fixed with a given probability separately in drives 8.10, 8.15 ... in strictly certain points in real time in accordance with the clock 7.7 common timing system (CTS), fixing the amount of delay of the completion of the ranging code from the given NS to SCS and remembering full statistical picture of the quality of radio signals specific NA on the observation interval (many parcels of radio signals)generated by the generator 7.5 gate accumulation (similarly for other channels 3.1.2, ... 3.1.m other receivers 3.2, ... 3.n serving other NS and other systems), completing primary treatment. Using the computer 4 with the use of appropriate software is real-time secondary processing of data drives 8.10, 8.15 ... so that for the same time get the estimated data geographical coordinates SCS obtained from analysis of data from several of the national Assembly, as well as several satellite navigation systems. When the agreement between the calculated geographic coordinates with the control data dislo is then the SCS produce a decision about health specific NA all three navigation systems, and when the mismatch state is invalid anomaly signals corresponding to the NA of the respective systems.

The device operates as follows. The device is a fixed ground control station (SCS) with a pre-calibrated geographical coordinates its dislocation by repeated measurements using a large number of different NA all existing navigation systems. It is assumed that whole-building block satellite receivers (BSP) 3 equipped in accordance with the objectives of the specific SCS respective group of receivers 3.1, ... 3.n, where n is implemented by the author of SCS, for example, equal to 6 (primary and backup receiver for each of the three satellite systems having differing from each other receivers). Various satellite systems have significant baseline differences (for example, in the GLONASS system each satellite emits radio signals on its own carrier frequency, and the GPS system is the same, but with different phase shifts, all systems have different number of satellites and the like), that when building a high-quality receivers led to their different specializations.

Using a broadband antenna module 1 (figure 1) is taken together with the interference and noise signals from all three systems. And for the best coverage of the sky ant the config module 1 consists of several individual antennas 1.1.1, ... 1.1-x with its low-noise high-frequency amplifiers and bandpass filters 1.2.1, ... h the Total signal from the outputs of the module 1 is supplied to the dispenser 2, which is designed for consistent distribution between all running in parallel receivers 3.1, ... 3.n using resistors 2.1, 2.2, 2.3, ... 2, providing a minimum wave of signal reflections.

For simplicity, let us consider the operation of the device at 24-channel receivers (m=24) for all three systems on the example of the first channel 3.1.1 first receiver 3.1. Each of the channels may have the same or different from their other channels operation modes to be installed before operation of the device through the inlet 11 engineering inputs, activating module 7 management register 7.1 management (by writing in the statement), which specifies using a generator 7.2 harmonic signals, their frequency and the phase at the corresponding outputs of the sin and cos using the generator 7.3 ranging code (usually he is known and unchanging, but in special conditions can be changed), with 7.4 clock frequency clock cycles of processing, using a generator 7.5 gate accumulation the magnitude of the sampling interval using the data generator 7.6 delay the delay clock cycles and with 7.7 hours NORTH synchronization of these cases a unified time system (CTS), as well as recording in the computer 4 geographical coordinates of the locations of SCS.

Radio module 9 is the amplification of radio signals and their selection on the background noise and interference for the first NA of the GLONASS system, and the conversion of radio signals with high frequency at the intermediate, after which the signal fed to the ADC input 10, the output of which receive a sequence of binary samples, the respective initial ranging code, which is then fed to the input of correlator 8. Processing of radio signals using the correlator 8 and transmitter 4 are presented above in the description of the method. It is only necessary to add that the results of the calculations in the calculator 4 are specified according to module 6 of meteorological sensors. Through group 5 computer information consumers (mainly aircraft) by means of communication and data transfer are not given here, as outside the scope of the technical solution) is transmitted, for example, the following information:

- all systems are functioning normally,

- GLONASS (or No. No. NA...) cannot be used,

- GPS (or No. No. NA...) cannot be used,

- GALILEO (or No. No. NA...) cannot be used,

- adopt amendments to the data....

1. The method of determination of invalid anomalies received signals of navigation satellites (NS), including acceptance radiosignal the NA connected in series through the antenna module, distributor of radio signals and a group of receivers, with each receiver carry out the amplification of radio signals NA, their selection of useful component of a mixture of noise and the transformation of the pure signal with high frequency on the intermediate with an RF module, followed by analog-to-digital conversion by the ADC, and then perform analysis on the transmitter output of a group of receivers together with the data of meteorological sensors (temperature, pressure and humidity of air and the production of quality signals navigation information and amendments thereto for its consumers, characterized in that said method is carried out using high-precision fixed ground control station (SCS) with pre-specified parameters of the dislocation, containing in its composition as a group of receivers such their set n is structurally integrated in the block satellite receivers (BSP), which, having redundant receivers, receives the radio signal NS from satellite navigation systems GLONASS, GPS and GALILEO, and performs digital statistical processing using programmable correlators, thus before you begin SCS provide engineering inputs in memory of her computer on the exact geographical dislocation SCS and modes the e work, and in the control register module control each receiver - operating modes and its correlator, and then in the process of SCS carry out the simultaneous reception of signals of all the national Assembly, located within the footprint of, and correlation signal processing NS for each navigation satellite systems operate on the group of his m-channel receivers for each of the NS separately in their respective channel at its correlator having in advance before you begin the programmed data structure of the ranging code and the time delay his initial front, the provisional size of the gate correlation accumulation, frequency and initial phase of the harmonic signal and the frequency of the clock cycles, in the result of correlation processing in real time in the output drive of each correlator is fixed with reference to the system a single time with a given probability of correct detection for each NS in the area within range of each satellite navigation system delay the passage of the ranging code from each NS to SCS, then the evaluator compares the output received from the BSP, so that for the same current fixed point in time get estimates geographical coordinates SCS received is based taken from different satellite navigation systems, when they match with each other and with the control data of the dislocation of the SCS produce a decision about health specific NA all three navigation systems, and in the mismatch state is invalid anomaly signals corresponding to the NA of the respective systems.

2. The determination device is invalid anomalies received signals NA, containing consistently connected the antenna module, the distributor of radio signals, the group of satellite receivers, the transmitter and group outputs transmitter for transmitting information to consumers, as well as the module of meteorological sensors, a group of outputs which are connected to the respective group of inputs of the transmitter, wherein the device is a fixed ground control station (SCS), the antenna module which contains several broadband antennas with their low-noise high-frequency amplifier, providing uniform radio reception given range from the whole sky, and a group of satellite receivers is such a set n is structurally integrated in the block satellite receivers (BSP), which contains the receivers, perceiving at the same time the radio signals from satellite navigation systems GLONASS, GPS and GALILEO, while BSP for each of these systems contains a group of priamikov reserve them and each receiver is m-channel pinning each channel for one of the NA, and each channel contains a radio frequency module, ADC control module receiver in the generators of harmonic signals, the ranging code, synchrotact, gate accumulation and signal delay, programmable correlator comprising eight multipliers, three-digit shift register and six independent drives, the group of information outputs and the inputs of the engineering inputs, the input and output of the radio frequency module connected to respective output of the distributor signals and to the first input of the ADC, the output of which is connected with the first inputs of the first and second multipliers, second input which are connected respectively to the outputs of the sin and cos generator harmonic signals, the output of the first multiplier is connected with the first inputs of the third, fourth and fifth multipliers and the output of the second multiplier connected to the first inputs of the sixth, seventh and eighth multipliers, the second inputs of the third and the sixth multiplier connected to the output of the first discharge shift register (SR), the output of the second category which is connected with the second inputs of the fourth and seventh multiplier, and the output of the third category CF is connected with the second inputs of the fifth and eighth multiplier, the outputs of the third, fourth, Pato is about, sixth, seventh and eighth multipliers are connected to the appropriate information inputs drives the first and second control inputs which are connected respectively to the outputs of the clock and gate generator accumulation, the generator output of the ranging code is connected with the information input SR input shifts which is connected to the input of ADC clock cycles and the output clock, the output of the signal generator delays connected to the input control clock, a group of engineering inputs inputs, which is the group of control inputs of the channel of the receiver, is a group of input devices, the group of information outputs drive each channel of each receiver through a single local area network connected to the group of information inputs of the transmitter, performing secondary processing of data drives in such a way that for the same time get the estimated data geographical coordinates SCS obtained from analysis of data from several of the national Assembly, as well as several satellite navigation systems, in this case the agreement between the calculated geographic coordinates with the control data of the dislocation of the SCS produce a decision about health specific NA all three navigation systems, and in the mismatch state is invalid ANO is Aliya signals corresponding to the NA of the respective systems.



 

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8 cl, 3 dwg

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1 dwg

FIELD: physics.

SUBSTANCE: navigation is performed using low earth orbit (LEO) satellite signals, as well as signals from two sources of ranging signals for determining associated calibration information, where a position is calculated using a navigation signal, a first and a second ranging signal and calibration information. Also possible is providing a plurality of transmission channels on a plurality of transmission time intervals using pseudorandom noise (PRN) and merging communication channels and navigation channels into a LEO signal. The method also involves broadcasting a LEO signal from a LEO satellite. Also disclosed is a LEO satellite data uplink. The invention also discloses various approaches to localised jamming of navigation signals.

EFFECT: high efficiency and ensuring navigation with high level of integration and security.

14 cl, 34 dwg

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