Method of improving integrity of used navigation satellite signals using local monitoring and correction station (lmcs) based on anomalous ionospheric effect

FIELD: radio engineering, communication.

SUBSTANCE: ground-based stationary local monitoring and corrections station (LMCS), having accurately predetermined coordinates of dislocation thereof, receives and processes radio signals of a group of radio-visible navigation satellites of active global navigation satellite systems using an antenna module, a satellite navigation receiver unit and a computer. The method employs additional self-contained equipment, having accurately predetermined coordinates of dislocation thereof and having an antenna module and a satellite navigation receiver unit for receiving and processing radio signals from navigation satellites, used for phase measurement of received radio signals of navigation satellites; simultaneously received radio signals from standard navigation satellites are processed independently of each other at receivers of their satellite navigation receiver unit such that, knowing the frequency and phase of radiation of radio transmissions of a specific navigation satellite and knowing the distance between the LMCS and self-contained equipment, the error of the effect of the ionosphere on the pseudo-range value is determined in length measurement units from measurements of full phases at spaced-apart satellite navigation receiver units, for which the full phase value from the self-contained equipment is transmitted over the corresponding channel to the LMCS computer, where the error of the effect of the ionosphere on at the present moment is finally determined.

EFFECT: providing detection and calculation of the error of the effect of the ionosphere on pseudo-range codes.

7 cl, 1 dwg

 

The invention relates to radio engineering, computer engineering, and global navigation satellite systems and can be used in civil aviation.

There is a method of formation of the amendments to the navigation information for the aircraft), described in utility model "Ground-based augmentation system in satellite navigation with the formation of amendments to the pseudorange [patent # 38055, IPC G01C 21/24 from 17.02. 2004], which is characterized by receiving and processing signals of navigation satellites (NS) with series-connected antenna module, block satellite navigation receivers and transmitter components LCCS with predefined coordinates of its location, having redundant information from different global navigation systems, compute the coordinates LCCS on radio NA these systems and compare them with exact real coordinates of the dislocation LCCS, on the basis of which produce amendments to codes designed the pseudorange.

The disadvantage of this method is the lack of accounting for the effects of the ionosphere, with the indignation which with increasing solar activity and cosmic radiation, increase error code pseudorange and decreases the accuracy LCCS and amendments to the codes of pseudorange and is also a lack of self-control LCKS.

Closest to the claimed method is the "Method of determination of invalid anomalies received signals of navigation satellites" [patent No. 2393504, IPC G01S 19/07 from 23.10. 2008], characterized in that a fixed ground LCCS with pre-defined coordinates of its location, receives and processes radio signals group redividing navigation satellites (NS) existing global navigation satellite systems using series-connected antenna module, block satellite navigation receivers (BSP) and transmitter (HF), thus receive the calculated coordinate data LCCS for different satellite navigation systems, at their coincidence/discrepancy in tolerance among themselves and with the control data of the coordinates of the dislocation itself LCCS produce a decision about health/fault specific NA respective navigation satellite systems, on what basis will block RF substandard NS to their rehabilitation, form and remember to RF obtained using conditional NS differential correction codes to the pseudorange.

The disadvantage of the prototype method is that it ignores the effect of the ionosphere, which change their electrical conductivity depending on the time of day and year, but the main thing about the solar activity and cosmic rays, on the changing conditions of the radio signals NA, i.e. the most important parameter of the satellite navigation - code pseudorange.

Depending on the degree of ionization space, through which pass the signals NA (more precisely periodic radiopacity representing a time-limited radiation radio frequency carrier modulated encoded information about the exact time of radiation radiopacity, the number NS and others), changed conditions and, most importantly, the propagation time of a radio signal. The path of the radio signal from the national Assembly, located at an altitude of 20,000 km from the earth, to LCCS on the ground, almost passes through the ionosphere (except 50-60 km, connecting with the earth), substantially changing its molecular structure under the action of solar and cosmic rays; as a result, ionization generated negative free electrons, positive ions and neutral particles. The strongest influence on the signal electrons have, roughly speaking, the curved path of the signal, some increasing and correspondingly increasing the propagation time of a radio signal from the moment of its emission (contained in radiomobile) up to the moment of reception of the satellite navigation receiver on the ground (determined using hours satellite navigation receiver, synchronized with the ATO the reference clock NS). Simply put, the propagation time of a radio signal from the national Assembly to the receiver (several tens of MILLISECONDS, depending on the specific distance of the national Assembly from the receiver) and there is a code pseudorange. With the receiver such codes from three different satellites, uniquely calculates the location of the receiver on earth (geographic or other coordinates).

But due to the ionization space and curvature of the path of the radio signal, the accuracy of this method deteriorates from fractions of a meter (in the absence of ionization) to tens and even hundreds of meters, which is not desirable for the safe movement of aircraft civilian aircraft.

The technical result and the purpose of this invention is to enhance the functionality of the prototype by providing detection and calculation errors of the influence of the ionosphere on codes pseudorange used by additional LCCS external equipment (IN), receiving also radio signals NA and allowing you to measure and compare the full phase radiosignals at spaced points.

The technical result and the goal is achieved by the fact that the way to improve the integrity of the used signals of navigation satellites using local control and correction station (LCCS) taking into account the influence of the anomalous ionosphere, kharakterizuyushchiisya the fact that notamn the I stationary LCCS, having pre-defined coordinates of its location, receives and processes radio signals group redividing navigation satellites (NS) existing global navigation satellite systems using series-connected antenna module, block satellite navigation receivers (BSP) and transmitter (HF), thus receive the calculated coordinate data LCCS for different satellite navigation systems, at their coincidence/discrepancy in tolerance among themselves and with the control data of the coordinates of the dislocation itself LCCS produce a decision about health/fault specific NA respective navigation satellite systems, based on which block in RF substandard NS to their rehabilitation, form and remember to RF obtained using conditional NS differential correction codes to the pseudorange, the method uses an additional remote equipment (IN), referred from LCCS a few hundred meters, with pre-defined coordinates of its location and contains its serially connected to the antenna module and BSP for receiving and processing radio signals from the national Assembly, with one of the receivers within LCCS and used for phase measurements of the received radio signals NA, simultaneously radiosignal the s from conforming NS LCCS and treated independently from each other on their receivers BSP thus, that knowing the frequency and phase of the radiation radiopacity specific NA and knowing the distance between LCCS and determine in units of length measurement error of the ionospheric effect on the value of the pseudorange measurements of the full phase in exploded BSP, which is full phase of the IN the corresponding channel transmit RF LCCS that finally determine the accuracy of the ionospheric effect on the current time on the value of the pseudorange by comparing the corresponding phase measurements obtained DURING and LCCS, then carry out statistical processing on a given time interval and form the displacement vector ionospheric anomalies, the results obtained remembered in the memory of the RF LCCS.

In Fig.1 presents a sketch explaining the method.

The method uses LCCS 1 in the structure of the antenna module 1.1, BSP 1.2, HF 1.3, antenna-feeder devices (AFD) 1.4 transmitter and 1.5 differential corrections, weather sensors 1.6 and 2 as part of their antenna module 2.1, 2.2 BSP and AFD 2.3 and receiver 2.4 differential corrections, as well as the communication channel 3.

For explanations see the group 4 NS, rays 5 radio NA, rays 6 signal differential corrections, earth 7 and sun 8.

The way to increase the integrity of the used signals of navigation satellites with ground-based local control and cut the station (LCCS) 1 (Fig.1) taking into account the influence of the anomalous ionosphere kharakterizuyushchiisya that LCCS 1, having a pre-defined coordinates of its location, receives and processes radio signals 5 group redividing navigation satellites (NS) 4 existing global navigation satellite systems using series-connected antenna module 1.1, block satellite navigation receivers (BSP) 1.2 and transmitter (HF) 1.3, thus receive the calculated coordinate data LCCS for different satellite navigation systems, when the match/mismatch tolerance between themselves and with the control data of the coordinates of the dislocation itself LCCS 1 produce a decision about health/fault specific NA 4 relevant navigation satellite systems, based on which block in RF 1.3 substandard NA 4 to their rehabilitation, form and remember in HF 1.3 obtained using conditional NA 4 differential 6 amendments to the codes of the pseudorange, and the fact that the method uses an additional remote equipment (IN) 2 referred from LCCS 1 to a few hundred meters, having pre-defined coordinates of its location and connected in series with the antenna module 2.1 and 2.2 BSP for receiving and processing radio signals from 5 NS 4, wherein one of the receivers in BSP 1.2 and 2.2 LCCS and 2 are used for gazovydeleniya the received radio signals 6 NA 4, at the same time accept the signals from the conforming NA 4 LCX 1 and 2 are treated independently from each other on their receivers BSP 1.2 and 2.2 so that, knowing the frequency and phase of the radiation radiopacity 6 specific NS 4 and knowing the distance between L CCF 1 and 2, defined in units of length measurement error of the ionospheric effect on the value of the pseudorange 6 from measurements of the full phase in exploded BSP 1.2 and 2.2, which is full phase of the 2 on the corresponding channel 3 transmit RF 1.3 LCCS 1, where to definitively determine the accuracy of the ionospheric effect on the current time on the value of the pseudorange 6 by comparing the corresponding phase measurements obtained AT 2 and LCX 1, then carry out statistical processing on a given time interval and form the displacement vector ionospheric anomalies, the results obtained remembered in the memory of the RF 1.3 LCCS 1.

The method is as follows.

For example, LCCS 1 and 2 installed in a airport (currently LCCS 1 works in all major airports of the Russian Federation, only about 100) with removal of 2 from LCCS 1 to a few hundred meters (the current implementation: from 200 to 6000 m). For these diversity antenna modules 1.1 and 2.1 receive radio signals 5 from almost the same NS 4, which pass through the same layer of the ionosphere./p>

It should be noted that LCCS 1 has valuable and accurate information of the status of all current global navigation satellite systems (GLONASS, GPS, GALILEO, and now the Chinese COMPASS), because it uses sensitive receivers BSP 1.2 redundancy and correlation processing of signals 5 with a relatively powerful computer (HF) 1.5, which, of course, in full due to weight and size restrictions may not allow aircraft navigation aircraft 8. Therefore, the main task LCCS 1 is to develop and transfer onboard the aircraft 8 differential corrections (DP) 6 to the code pseudorange, which is practically carried out, for example, with a rate of DP 2 times per minute in the zone of action LCCS 1, for example a component of 250 km around the airport. Moreover, in the area LCCS issue 1 APS 6 automatically and immediately to all SU 8 in this area through the corresponding transmitter 1.5 and 1.4 AFD (Fig.1), for example in the UHF range. Received on sun 8 through its on-Board antenna 2.3 and VHF receiver 2.4 DP 6 is used for the automatic specification in the on-Board satellite navigation receiver, producing codes pseudorange for this SU 8 (and, hence, its position in space) without the participation of the pilot who sees only the specification of the flight track (Fig.1 is not shown on-Board equipment is a cation, because it is beyond the scope of this proposal).

The above refers mainly to the work of the famous prototype and provided for greater clarity of the claimed invention. Moreover, without anomalies of the ionosphere that affect the accuracy of the code pseudorange, falling in the worst case, for hundreds of meters.

Actually the way this proposal is to identify and evaluate emerging anomalies of the ionosphere, not only for timely corrections through DP 6 code pseudorange for SU 8, but for many other tasks, such as the locations of LCCS 1 and other

To identify and assess emerging anomalies in the ionosphere in the method used IN 2 referred from LCCS 1 to a few hundred meters (depending on the capabilities of this aeroporta 200-6000 m, does not matter), have pre-defined coordinates of its deployment (initially using surveying instruments with the installation of the corresponding geodesic peg, and then the process IN 2 together with LCKS 1 these coordinates specify their own). 2 contains your serial connected antenna module 2.1 and 2.2 BSP for receiving and processing radio signals from 5 NS 4. It is important to emphasize that one of the receivers in BSP 2.2 IN 2 and BSP 1.2 LCCS 1 is used in mode phase measurements of the received radio signals from 5 NS 4, that is, more precisely, determine the number of full phases or their shares (or periods or their parts) that meet specific NA 4 to a specific satellite receiver (i.e., BSP 1.2 and 2.2) the carrier frequency of the corresponding signal NS 4 (more precisely, radiopacity with a limited length). On the used carrier frequencies of the radio signals NA 4 accurate to the centimeter is sufficient to calculate the full phase (periods). At the same time accept radio signals 5 from the conforming specific NA 4 in exploded BSP 1.2 and 2.2 process so that, knowing the frequency and phase of the radiation radiopacity specific NS 4 and knowing the distance between LCCS 1 and 2 (or their coordinates dislocation), defined in units of length (centimeters or meters) the accuracy of the ionospheric effect on the value of the code pseudorange. Simply put, due to the curvature of the beam 5 radiopacity from NS 4 (affected by the free electrons of the ionized region) is lengthening his path and the corresponding RAID phases. And the more the anomaly of the ionosphere, the greater the curvature of the beam 5 and the greater the attack phase. Measurement of the 2 channel 3 transmit RF 1.3 LCCS 1, which compares the corresponding pairs of measurements in the 2 and LCX 1 for the same NS 4 and the same points in time and determine the degree of influence of the ionosphere on codes pseudorange. In addition, HF 1. carry out statistical processing with observations at predetermined time intervals, including daily and seasonal form the displacement vector anomalies in the ionosphere and save the results for future use.

In BSP 1.2 and 2.2 can be used different number of receivers, which affects the reliability and quality of the work and does not change the fact of the way. Likewise, the method can be used meteorological sensors 1.6 temperature, humidity and air pressure in the zone of dislocation LCCS 1 and 2. The method can be used multi-frequency radio signals NS 4 (currently the satellites emit in each parcel two frequencies, and perhaps in the future 3 or more frequencies.) When dual mode BSP 1.2 and 2.2 establish the respective receivers and receive approximately two times more accurate measurements.

The method has the additional positive effect of self-control. In addition to the above-described processes is added to the reception IN 2 of LCCS 1 APS 6 (through the transmitter 1.5, 1.4 AFD, channel 6 and AFD 2.3 receiver 2.4) that periodically, for example every 30 seconds, issued in the ether for SU 8 (Fig.1) and take into account each time the status of satellite weather (LCCS 1 by comparing the work of the national Assembly 4 different global navigation satellite systems identify and subsequently use only the conforming NA 4) and anomalies of the ionosphere. Moreover, taking APS 6 in the receiver 2.4 IN 2 Ki is the simulator aircraft 8, but unlike the latter has the exact verified and unchanged its coordinates dislocation. Later in BSP 2.2 correct calculated it codes the pseudorange in accordance with a given time DP 6, and the results broadcast on channel 3 RF 1.3, where it expects coordinates IN the 2 and compare them with a reference known beforehand verified the coordinates of the dislocation IN the 2nd. The coincidence of these values is within the tolerance ascertain proper operation LCCS 1 and 2 and the correctness of developing PD 6. Otherwise, radio APS 6 to sun 8 issued a ban on the use of DP 6 to rehabilitation in subsequent cycles of the control.

1. The way to increase the accuracy of the used signals of navigation satellites using local control and correction station (LCCS) taking into account the influence of the anomalous ionosphere, characterized in that a fixed ground LCCS with pre-defined coordinates of its location, receives and processes radio signals group redividing navigation satellites (NS) existing global navigation satellite systems using series-connected antenna module, block satellite navigation receivers (BSP) and transmitter (HF), thus receive the calculated coordinate data LCCS for different satellite navigation systems, when the match/mismatch tolerance between themselves and with the control data of the coordinates of the dislocation itself LCCS produce a decision about health/fault specific NA sootvetstvujushij navigation satellite systems, on what basis will block RF substandard NS to their rehabilitation, form, give, aircraft (SU) and remember in HF obtained using conditional NS differential corrections to the codes of pseudorange, characterized in that the method uses an additional remote equipment (IN), referred from LCCS a few hundred meters, with pre-defined coordinates of its location and connected in series with the antenna module and BSP for receiving and processing radio signals from the national Assembly, with one of the receivers within LCCS and used for phase measurements of the received radio signals NA, at the same time accept the signals from the conforming NS LCCS and treated independently from each other on their receivers BSP so that, knowing the frequency and phase of the radiation radiopacity specific NA and, knowing the distance between LCCS and determine in units of length measurement error of the ionospheric effect on the value of the pseudorange measurements of the full phase in exploded BSP, which is full phase of the IN the corresponding channel transmit RF LCCS that finally determine the error of the effects of the ionosphere on the current time on the value of the pseudorange by comparing the corresponding phase measurements, received in IN and the CCF, then carry out statistical processing on a given time interval and form the displacement vector ionospheric anomalies, the results remember in RF LCKS.

2. The method according to p. 1, characterized in that BSP LCCS and IN use n receivers at n=1, 2. 3, ...

3. The method according to p. 1, characterized in that LCCS and take and process x-frequency radio signals NA x=1, 2, 3, ...

4. The method according to p. 1, characterized in that it take into account the data of the meteorological sensors for temperature, humidity and air pressure in the area LCKS.

5. The method according to p. 1, wherein the procedure of determining the error code pseudorange from the influence of the ionosphere is repeated several times and average the error.

6. The method according to p. 1, characterized in that exercise self-control LCCS IN, which issued in the ether of LCCS using a radio transmitter for SU differential corrections received through the corresponding channel and through its BSP take into account the values of pseudorange received via its antenna module from the current redividing conforming NS, for which the calculated location coordinates IN taking into account the influence of the ionosphere, and then compare the calculated coordinates to real coordinates of the dislocation, the results of the comparison are passed through the corresponding channel in the RF LCCS to register the tion and subsequent analysis, when exceeding the tolerance of the differences between calculated and actual location coordinates IN state negative control, in connection with which the radio channel differential corrections from LCCS passed to the SU command on the temporary prohibition of the use of differential corrections, then repeat the procedure control LCCS and IN monitoring the condition of global navigation satellite systems and to develop new differential corrections, which again allowed to use SU when that does not exceed the above tolerances.

7. The method according to p. 1, characterized in that as LCCS use any other station receiving radio signals NA and processing them using the same BSP and HF, including second IN RF.



 

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EFFECT: high accuracy of position finding.

8 cl, 3 dwg

FIELD: physics.

SUBSTANCE: device includes a GPS/GLONASS receiver, an antenna, a user interface (keyboard, display, sound), a communication interface, nonvolatile memory, a microcontroller, consisting of a unit for calculating the coordinate vector from code measurements, a unit for calculating the increment of the coordinate vector from phase measurements, a filter unit based on a least-square method, a unit for calculating a specified coordinate vector from the filtration results, a unit for working with interfaces, where the microcontroller includes a unit for analysing stability of the phase solution, a unit for evaluating duration of measurements and geometrical factor of the constellation of satellites, as well as a correcting unit consisting of a counter for counting stable solutions and a decision unit for deciding on continuing measurements, interfaces for time marking external events and outputting the second mark.

EFFECT: highly accurate determination of coordinates of a receiver based on differential processing of phase measurements with complete elimination of phase ambiguity.

1 dwg

FIELD: physics.

SUBSTANCE: device includes a GPS/GLONASS receiver, an antenna, a user interface (keyboard, display, sound), a communication interface, nonvolatile memory, a microcontroller, consisting of a unit for calculating the coordinate vector from code measurements, a unit for calculating the increment of the coordinate vector from phase measurements, a filter unit based on a least-square method, a unit for calculating a specified coordinate vector from the filtration results, a unit for working with interfaces, where the microcontroller includes a unit for analysing stability of the phase solution, a unit for evaluating duration of measurements and geometrical factor of the constellation of satellites, as well as a correcting unit consisting of a counter for counting stable solutions and a decision unit for deciding on continuing measurements, interfaces for time marking external events and outputting the second mark.

EFFECT: highly accurate determination of coordinates of a receiver based on differential processing of phase measurements with complete elimination of phase ambiguity.

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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