CN108957489A - A kind of ground test verifying system and method for low orbit satellite navigation enhancing signal - Google Patents
A kind of ground test verifying system and method for low orbit satellite navigation enhancing signal Download PDFInfo
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- CN108957489A CN108957489A CN201810527154.4A CN201810527154A CN108957489A CN 108957489 A CN108957489 A CN 108957489A CN 201810527154 A CN201810527154 A CN 201810527154A CN 108957489 A CN108957489 A CN 108957489A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S19/00—Satellite radio beacon positioning systems; Determining position, velocity or attitude using signals transmitted by such systems
- G01S19/01—Satellite radio beacon positioning systems transmitting time-stamped messages, e.g. GPS [Global Positioning System], GLONASS [Global Orbiting Navigation Satellite System] or GALILEO
- G01S19/13—Receivers
- G01S19/20—Integrity monitoring, fault detection or fault isolation of space segment
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S19/00—Satellite radio beacon positioning systems; Determining position, velocity or attitude using signals transmitted by such systems
- G01S19/01—Satellite radio beacon positioning systems transmitting time-stamped messages, e.g. GPS [Global Positioning System], GLONASS [Global Orbiting Navigation Satellite System] or GALILEO
- G01S19/13—Receivers
- G01S19/23—Testing, monitoring, correcting or calibrating of receiver elements
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- Engineering & Computer Science (AREA)
- Radar, Positioning & Navigation (AREA)
- Remote Sensing (AREA)
- Computer Networks & Wireless Communication (AREA)
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- General Physics & Mathematics (AREA)
- Computer Security & Cryptography (AREA)
- Monitoring And Testing Of Transmission In General (AREA)
- Radio Relay Systems (AREA)
Abstract
Navigating the invention discloses a kind of low orbit satellite enhances the ground test verifying system and method for signal, can be realized and carries out ground test verifying to the navigation signal of low orbit satellite.The specific scheme is that low orbit satellite broadcasts satellite navigation enhancing signal by satellite platform end, increase non-band spectrum modulation carrier wave in the unoccupied time slot of navigation enhancing signal；Ground test verifying system is realized in the following way: the signal broadcast using antenna controller control high-gain aerial automatic tracking satellite platform end；High-gain aerial using gain not less than 40db, which receives satellite navigation, enhances signal, using non-band spectrum modulation carrier wave as beacon signal, carries out pointing and locking to satellite navigation enhancing signal using wave beam；Satellite navigation enhancing signal is filtered and is divided into two-way using filter and is exported, general frequency spectrograph is output to all the way and carries out spectrum analysis, another output is connected to RF acquisition playback apparatus and carries out reprocessing analysis.
Description
Technical field
The present invention relates to satellite signal grounds to test verification technique field, and in particular to a kind of low orbit satellite navigation enhancing letter
Number ground test verify system and method.
Background technique
Global Navigation Satellite System (GNSS) has played great effect in the various aspects such as military, civilian, navigation
Enhancing technical purpose is to play the role of auxiliary to GNSS in various aspects such as continuity, spreadability, positioning performance, integrity.
From the essence of enhancing, signal enhancing and two class of information enhancement can be divided into.
Navigation signal has natural fragility, landing level be submerged in noise hereinafter, low orbit satellite navigation signal not yet
Therefore exception in the test of signal ground receiver, is difficult through the direct observation signal spectrum waveform of the common apparatus such as frequency spectrograph.
At the initial stage for carrying out low orbit satellite navigation signal verification experimental verification, uncertain state is numerous with factor, specifically includes that
Whether the navigation signal based on low orbit satellite broadcasts, whether navigation signal landing level consistent with initial stage link budget valuation,
Face receives whether system is normal, whether floor treatment method is correct etc..The problem of any link, all may cause low orbit satellite and lead
Boat signal cannot be demodulated correctly.
Fig. 1 is that system is verified in the test of the navigation enhancing signal broadcast for low orbit satellite platform existing at present, existing
Under some navigation enhancing signal format, ground receiving wastewater facility includes the omnidirectional antenna being sequentially connected, filter, receiving device, number
According to display and analytical equipment.There are three difficult points when testing verifying early period for the system: first, landing signal level is lower than noise,
General spectral observation equipment can not detect signal；Second, emit equipment, satellite platform status monitoring difficulty in contrast to ground signal
Increase, signal testing phenomenon is difficult to reappear；Third, satellite platform launch cost is higher, early period Design of Signal should have it is sustainable
Improve escalation policy.
There has been no a kind of ground test verifying systems or method can overcome above-mentioned difficult point at present, for leading for low orbit satellite
The signal that navigates carries out ground test verifying.
Summary of the invention
In view of this, navigating the present invention provides a kind of low orbit satellite enhances ground test verifying system and the side of signal
Method can overcome the difficult point of the prior art, realize and verify to the ground test of the navigation signal of low orbit satellite.
In order to achieve the above objectives, the ground test for providing a kind of low orbit satellite navigation enhancing signal of the invention verifies system
System, low orbit satellite are broadcast satellite navigation enhancing signal by satellite platform end, are increased in the unoccupied time slot of navigation enhancing signal
Add non-band spectrum modulation carrier wave.
Ground test verifies system, including the playback of antenna controller, high-gain aerial, filter, frequency spectrograph, RF acquisition
Equipment and reprocessing analysis equipment.
Have ephemeris information in antenna controller, antenna controller according to ephemeris information, control high-gain aerial automatically with
The signal that track satellite platform end is broadcast.
High-gain aerial gain is not less than 40db, for receiving satellite navigation enhancing signal, while with non-band spectrum modulation load
Wave is beacon signal, carries out pointing and locking to satellite navigation enhancing signal using wave beam.
Filter filters and is divided into two-way output to the satellite navigation enhancing signal that high-gain aerial receives, and exports all the way
It is connected to general frequency spectrograph, another output is connected to RF acquisition playback apparatus；
General frequency spectrograph is used to carry out spectrum analysis to satellite navigation enhancing signal.
RF acquisition playback apparatus is used to that satellite navigation enhancing signal to be acquired and be played back, and satellite navigation is enhanced
Signal is sent in reprocessing analysis equipment.
Reprocessing analysis equipment obtains the frequency point parameters of general frequency spectrograph, resolution bandwidth RBW parameter and frequency sweep time ginseng
Number chooses the reciprocal value of RBW parameter as the time of integration, generates local non-band spectrum modulation carrier wave respectively and local band spectrum modulation carries
Wave and satellite navigation enhancing signal carry out matching related operation, calculate satellite navigation enhancing signal carrier frequency point and spreading code phase
Position.
Further, the signal system of navigation enhancing signal are as follows:
It is repeated by the period of frame, every frame includes 3 subframes, is denoted as the first subframe, the second subframe and third subframe respectively, often
A subframe is divided into 8 time slots, and the minislot parameter of each subframe is configured by upper note, minislot parameter include synchronous head configuration parameter,
Signal power configuration parameter, the first subframe~third subframe configuration parameter.
Wherein the configuration parameter of subframe includes subframe numbers, time slot pattern and frequency expansion sequence configuration.
Time slot pattern is 8 bit, the first time slot~the 8th time slot is respectively corresponded from a high position to low level, every bit has 1 and 0
Two states, when bit is 1, corresponding time slot is signal broadcast time slot, and bit is that correspond to time slot be the free time for 0 expression.
Frequency expansion sequence is 32 bit, i.e. 4 bytes, and the corresponding frequency expansion sequence index of every nybble divides from high to low
Not Dui Ying the first time slot~the 8th time slot frequency expansion sequence, wherein frequency expansion sequence index is 1~14 is corresponding frequency expansion sequence, spread spectrum
It is non-spread spectrum carrier wave when sequence index is 15, it is unoccupied that frequency expansion sequence index corresponds to time slot when being 0.
Further, navigating the present invention also provides a kind of low orbit satellite enhances the survey of the ground test verifying system of signal
Verification method is tried, system is verified using above-mentioned ground test, is included the following steps:
Step 1: low orbit satellite, which broadcasts satellite navigation by satellite platform end, enhances signal, navigation enhancing the non-of signal is accounted for
With increasing non-band spectrum modulation carrier wave in time slot.
Ephemeris information is inputted in antenna controller, for antenna controller according to ephemeris information, control high-gain aerial is automatic
The signal that tracking satellite platform end is broadcast.
Filter filters and is divided into two-way output to the satellite navigation enhancing signal that high-gain aerial receives, and exports all the way
It is connected to general frequency spectrograph, another output is connected to RF acquisition playback apparatus.
Step 2: adjusting the frequency point parameters of general frequency spectrograph, resolution bandwidth RBW parameter and frequency sweep time parameter, specifically
Method are as follows:
The resolution bandwidth RBW parameter of general frequency spectrograph is chosen according to the characteristics of signals of navigation enhancing signal, in signal subspace
When the frame period is T1, RBW parameter is adjusted downwards since highest 1/T1, with stepping 1kHz until the observation of general frequency spectrograph is defended
Star enhances the single carrier frequency spectrum of signal, the RBW parameter that corresponding RBW parameter is as finally set at this time, and records list at this time
Carrier frequency point is for being arranged frequency point parameters；Frequency sweep time parameter is set according to the demand that ground test is verified.
Step 3: reprocessing analysis equipment obtains the frequency point parameters of general frequency spectrograph, resolution bandwidth RBW parameter and frequency sweep
Time parameter chooses the reciprocal value of RBW parameter as the time of integration, generates local non-band spectrum modulation carrier wave respectively and locally spreads
Modulation carrier wave and satellite navigation enhancing signal carry out matching related operation, calculate satellite navigation enhancing signal carrier frequency point and spread spectrum
Code phase.
The utility model has the advantages that
(1) increase non-band spectrum modulation carrier wave, Ke Yi in the unoccupied time slot of satellite navigation enhancing signal in the present invention
Satellite navigation enhancing signal authentication initial stage effectively assists the automatic pointing of high-gain aerial, while being conducive to spectral observation；To satellite
After navigation enhancing signal filtering, it is divided into two-way, spectral observation is carried out using general frequency spectrograph all the way, another way enters RF acquisition
Playback apparatus, this ensure that spectral observation and data collection synchronous carry out, while carrying out reprocessing analysis to data, substitution is former
Some immediate processing modes are conducive to scale-up problem details and problem moment precise positioning；The present invention is played back using RF acquisition
The integrated design of equipment can recall the radiofrequency signal of acquisition, be conducive to the reproduction of problem, and the reality of auxiliary next stage
When handle.
(2) present invention improves the format of satellite navigation enhancing signal, and wherein the setting of time slot pattern specifies
The time domain distribution and the configuration of duration, frequency expansion sequence of satellite navigation enhancing signal specify frequency expansion sequence state, signal
Power configuration specifies the transmission power of satellite navigation enhancing signal, and the format of improved navigation enhancing signal is a kind of logical
With configurable table is changed, it can be configured by infusing interface on satellite, reach largest enveloping using minimum satellite platform to reach
The purpose of performance test verifying under signal format, so as to carry out the letter under multi-signal parameter using single satellite platform
Number performance test verifying, facilitates the smooth transition that practical stage is authenticated to from initial stage.
Detailed description of the invention
Fig. 1 is that the navigation that current existing low orbit satellite platform is broadcast enhances signal format and test verifying system structure
Schematic diagram；
Fig. 2 is that a kind of low orbit satellite navigation enhancing signal format provided by the invention and ground test verify system structure
Schematic diagram；
Fig. 3 is that satellite navigation provided in an embodiment of the present invention enhances signal format schematic diagram.
Specific embodiment
The present invention will now be described in detail with reference to the accompanying drawings and examples.
The present invention provides a kind of the navigate ground tests of enhancing signal of low orbit satellite to verify system and method, and 1, a kind of low
The ground test that rail satellite navigation enhances signal verifies system, which is characterized in that low orbit satellite is broadcast by satellite platform end
Satellite navigation enhances signal, increases non-band spectrum modulation carrier wave in the unoccupied time slot of navigation enhancing signal.In the embodiment of the present invention,
Non- band spectrum modulation carrier wave is the auxiliary carrier signal of despreading processing.
Ground test verifies system, including the playback of antenna controller, high-gain aerial, filter, frequency spectrograph, RF acquisition
Equipment and reprocessing analysis equipment；
Have ephemeris information in antenna controller, antenna controller according to ephemeris information, control high-gain aerial automatically with
The signal that track satellite platform end is broadcast；
High-gain aerial gain is not less than 40db, for receiving satellite navigation enhancing signal, while with non-band spectrum modulation load
Wave is beacon signal, carries out pointing and locking to satellite navigation enhancing signal using wave beam.Wherein high-gain aerial is receiving
After beacon signal, pointing locking can be actively carried out.
Filter filters and is divided into two-way output to the satellite navigation enhancing signal that high-gain aerial receives, and exports all the way
It is connected to general frequency spectrograph, another output is connected to RF acquisition playback apparatus；
General frequency spectrograph is used to carry out spectrum analysis to satellite navigation enhancing signal；
RF acquisition playback apparatus is used to that satellite navigation enhancing signal to be acquired and be played back, and satellite navigation is enhanced
Signal is sent in reprocessing analysis equipment；
Reprocessing analysis equipment obtains the frequency point parameters of general frequency spectrograph, resolution bandwidth RBW parameter and frequency sweep time ginseng
Number chooses the reciprocal value of RBW parameter as the time of integration, generates local non-band spectrum modulation carrier wave respectively and local band spectrum modulation carries
Local non-band spectrum modulation carrier wave, local band spectrum modulation carrier wave are carried out matching related fortune by wave to satellite navigation enhancing signal respectively
It calculates, calculates satellite navigation enhancing signal carrier frequency point and spread spectrum code phase.When wherein choosing the reciprocal value of RBW parameter as integral
Between, existing method can be used by generating local non-band spectrum modulation carrier wave and local band spectrum modulation carrier wave respectively.It will local non-expansion
Frequency modulation carrier wave, local band spectrum modulation carrier wave carry out matching related operation with satellite navigation enhancing signal respectively, calculate satellite and lead
Boat enhancing signal carrier frequency point and spread spectrum code phase can also be solved using existing method.
Navigation enhancing signal signal system as shown in Fig. 2, specifically: using frame be the period repeat, every frame include 3 sons
Frame, is denoted as the first subframe, the second subframe and third subframe respectively, and each subframe is divided into 8 time slots, the minislot parameter of each subframe
It is configured by upper note, minislot parameter includes synchronous head configuration parameter, signal power configuration parameter, the first subframe~third subframe
Configuration parameter.
Wherein the configuration parameter of subframe includes subframe numbers, time slot pattern and frequency expansion sequence configuration；
Time slot pattern is 8 bit, the first time slot~the 8th time slot is respectively corresponded from a high position to low level, every bit has 1 and 0
Two states, when bit is 1, corresponding time slot is signal broadcast time slot, can be used for frequency expansion sequence or non-band spectrum modulation carrier wave
It broadcasts, bit is that correspond to time slot be idle for 0 expression.
Frequency expansion sequence is 32 bit, i.e. 4 bytes, and the corresponding frequency expansion sequence index of every nybble divides from high to low
Not Dui Ying the first time slot~the 8th time slot frequency expansion sequence, wherein frequency expansion sequence index is 1~14 is corresponding frequency expansion sequence, spread spectrum
It is non-spread spectrum carrier wave when sequence index is 15, it is unoccupied that frequency expansion sequence index corresponds to time slot when being 0.
Such as subframe 1 shown in Fig. 2, frequency expansion sequence 0x159AFFFF, then it represents that the corresponding spread spectrum of 1~time slot of time slot 4
Sequence is 1,5,9,10, and 5~time slot of time slot 8 corresponds to non-spread spectrum subcarrier.Frequency expansion sequence is in subframe 2
0x1000FFFF indicates that the corresponding frequency expansion sequence of time slot 1 is 1, and time slot 2~4 is the free time, and time slot 5~8 corresponds to non-spread spectrum auxiliary
Carrier wave.Frequency expansion sequence is 0xFFFF1100 in subframe 3, indicates that time slot 1~4 corresponds to non-spread spectrum subcarrier, 5~6 pairs of time slot
The frequency expansion sequence answered is 1, and time slot 7~8 is the free time.
Being navigated based on above-mentioned low orbit satellite enhances the ground test verifying system of signal, and the embodiment of the invention also provides one
Kind test verification method, includes the following steps:
Step 1: low orbit satellite, which broadcasts satellite navigation by satellite platform end, enhances signal, navigation enhancing the non-of signal is accounted for
With increasing non-band spectrum modulation carrier wave in time slot.
Ephemeris information is inputted in antenna controller, for antenna controller according to ephemeris information, control high-gain aerial is automatic
The signal that tracking satellite platform end is broadcast.
Filter filters and is divided into two-way output to the satellite navigation enhancing signal that high-gain aerial receives, and exports all the way
It is connected to general frequency spectrograph, another output is connected to RF acquisition playback apparatus.
Step 2: adjusting the frequency point parameters of general frequency spectrograph, resolution bandwidth RBW parameter and frequency sweep time parameter, specifically
Method are as follows:
The resolution bandwidth RBW parameter of general frequency spectrograph is chosen according to the characteristics of signals of navigation enhancing signal, in signal subspace
When the frame period is T1, RBW parameter is adjusted downwards since highest 1/T1, with stepping 1kHz until the observation of general frequency spectrograph is defended
Star enhances the single carrier frequency spectrum of signal, the RBW parameter that corresponding RBW parameter is as finally set at this time, and records list at this time
Carrier frequency point is for being arranged frequency point parameters；Frequency sweep time parameter is set according to the demand that ground test is verified.
Step 3: reprocessing analysis equipment obtains the frequency point parameters of general frequency spectrograph, resolution bandwidth RBW parameter and frequency sweep
Time parameter chooses the reciprocal value of RBW parameter as the time of integration, generates local non-band spectrum modulation carrier wave respectively and locally spreads
Modulation carrier wave and satellite navigation enhancing signal carry out matching related operation, calculate satellite navigation enhancing signal carrier frequency point and spread spectrum
Code phase.
In conclusion the above is merely preferred embodiments of the present invention, being not intended to limit the scope of the present invention.
All within the spirits and principles of the present invention, any modification, equivalent replacement, improvement and so on should be included in of the invention
Within protection scope.
Claims (3)
1. a kind of ground test of low orbit satellite navigation enhancing signal verifies system, which is characterized in that passing through for low orbit satellite is defended
Satellite navigation enhancing signal is broadcast at star platform end, is increased non-band spectrum modulation in the unoccupied time slot of the navigation enhancing signal and is carried
Wave；
The ground test verifies system, including the playback of antenna controller, high-gain aerial, filter, frequency spectrograph, RF acquisition
Equipment and reprocessing analysis equipment；
Has ephemeris information in the antenna controller, antenna controller controls the high-gain day according to the ephemeris information
The signal that line automatic tracking satellite platform end is broadcast；
The high-gain aerial gain is not less than 40db, for receiving the satellite navigation enhancing signal, while with the non-expansion
Frequency modulation carrier wave is beacon signal, carries out pointing and locking to satellite navigation enhancing signal using wave beam；
The filter filters and is divided into two-way output to the satellite navigation enhancing signal that the high-gain aerial receives,
Output is connected to general frequency spectrograph all the way, and another output is connected to RF acquisition playback apparatus；
The general frequency spectrograph is used to carry out spectrum analysis to satellite navigation enhancing signal；
The RF acquisition playback apparatus is used to that satellite navigation enhancing signal to be acquired and be played back, and by the satellite
Navigation enhancing signal is sent in the reprocessing analysis equipment；
When the reprocessing analysis equipment obtains the frequency point parameters, resolution bandwidth RBW parameter and frequency sweep of the general frequency spectrograph
Between parameter, the reciprocal value for choosing RBW parameter is used as the time of integration, generates local non-band spectrum modulation carrier wave and local spread spectrum tune respectively
Carrier wave processed and satellite navigation enhancing signal carry out matching related operation, calculate the satellite navigation enhancing signal carrier frequency point
And spread spectrum code phase.
2. the system as claimed in claim 1, which is characterized in that the signal system of the navigation enhancing signal are as follows:
It is repeated by the period of frame, every frame includes 3 subframes, is denoted as the first subframe, the second subframe and third subframe, every height respectively
Frame is divided into 8 time slots, and the minislot parameter of each subframe is configured by upper note, and minislot parameter includes synchronous head configuration parameter, signal
Power configuration parameter, the first subframe~third subframe configuration parameter；
Wherein the configuration parameter of subframe includes subframe numbers, time slot pattern and frequency expansion sequence configuration；
Time slot pattern is 8 bit, the first time slot~the 8th time slot is respectively corresponded from a high position to low level, every bit has 1 and 0 two
State, when bit is 1, corresponding time slot is signal broadcast time slot, and bit is that correspond to time slot be the free time for 0 expression；
Frequency expansion sequence is 32 bit, i.e. 4 bytes, the corresponding frequency expansion sequence of every nybble indexes, right respectively from high to low
The first time slot~the 8th time slot frequency expansion sequence is answered, wherein frequency expansion sequence index is corresponding frequency expansion sequence, frequency expansion sequence for 1~14
Index is non-spread spectrum carrier wave when being 15, and it is unoccupied that frequency expansion sequence index corresponds to time slot when being 0.
3. a kind of test verification method of the ground test verifying system of low orbit satellite navigation enhancing signal, which is characterized in that adopt
System is verified with ground test as described in claim 1, is included the following steps:
Step 1: low orbit satellite, which broadcasts satellite navigation by satellite platform end, enhances signal, navigation enhancing the non-of signal is accounted for
With increasing non-band spectrum modulation carrier wave in time slot；
Ephemeris information is inputted in the antenna controller, the antenna controller controls the height according to the ephemeris information
The signal that gain antenna automatic tracking satellite platform end is broadcast；
The filter filters and is divided into two-way output to the satellite navigation enhancing signal that the high-gain aerial receives,
Output is connected to general frequency spectrograph all the way, and another output is connected to RF acquisition playback apparatus；
Step 2: adjusting frequency point parameters, resolution bandwidth RBW parameter and the frequency sweep time parameter of the general frequency spectrograph, specifically
Method are as follows:
The resolution bandwidth RBW parameter of the general frequency spectrograph is chosen according to the characteristics of signals of the navigation enhancing signal, is believing
When number period of sub-frame is T1, RBW parameter adjusts downwards since highest 1/T1, with stepping 1kHz until the general frequency spectrograph sight
The single carrier frequency spectrum of the survey acquisition satellite enhancing signal, the RBW parameter that corresponding RBW parameter is as finally set at this time, and
The single carrier frequency point of record at this time is for being arranged the frequency point parameters；The need that the frequency sweep time parameter is verified according to ground test
Ask setting；
Step 3: the reprocessing analysis equipment obtain the frequency point parameters of the general frequency spectrograph, resolution bandwidth RBW parameter and
Frequency sweep time parameter chooses the reciprocal value of RBW parameter as the time of integration, generates local non-band spectrum modulation carrier wave and local respectively
Band spectrum modulation carrier wave and satellite navigation enhancing signal carry out matching related operation, calculate the satellite navigation enhancing signal and carry
Wave frequency point and spread spectrum code phase.
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