CN103116170B - Indoor testing system of antenna array based interference rejection module of global navigation satellite system (GNSS) - Google Patents
Indoor testing system of antenna array based interference rejection module of global navigation satellite system (GNSS) Download PDFInfo
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Abstract
The invention discloses an indoor testing system of an antenna array based interference rejection module of a global navigation satellite system (GNSS). The indoor testing system comprises a control unit, a multichannel figure interference signal producing unit, an interference rejection processing unit and an interference rejection performance analyzing unit. The control unit is used for controlling types of intermediate frequency figure interference signals produced by the multichannel figure interference signal producing unit, and the multichannel figure interference signal producing unit is used for producing multi-way intermediate frequency figure interference signals. The interference rejection processing unit is the antenna array based interference rejection module of the GNSS and used for rejecting the multi-way intermediate frequency figure interference signals produced by the multichannel figure interference signal producing unit. The interference rejection performance analyzing unit is used for analyzing interference rejection performance of the interference rejection processing unit. The indoor testing system of the antenna array based interference rejection module of the GNSS can test and analyze all stages of an antenna array based interference rejection algorithm in the GNSS receiver, and the problem that testing of the antenna array based interference rejection algorithm is difficult is solved.
Description
Technical field
The invention belongs to the GLONASS (Global Navigation Satellite System) field, particularly a kind of GNSS's disturbs based on aerial array the indoor test system that suppresses module.
Background technology
Along with GNSS(Global Navigation Satellite System, GLONASS (Global Navigation Satellite System)) greatly develop and generally the application, its fragility research of people's growing interest.In military domain, the existing Interferenc and anti interference technology for navigation is applied to actual armament systems, and (as the war in Iraq and Kosovo War) represented in the part war.Therefore, the Interference and its suppression technology of GNSS receiving system becomes the study hotspot in this field.
In various interference mitigation technologies, the airspace filter based on aerial array, when empty and empty adaptive processing technique frequently become the main study subject in this field owing to can suppressing polytype interference.The above-mentioned interference mitigation technology based on aerial array mainly relies on the phase differential between each array element signals in aerial array to adjust the spatial domain direction that receives signal, forms zero and fall on the direction of arrival disturbed, thereby reach, suppresses the purpose of disturbing.Yet, the performance test of interference mitigation technology is higher to environmental requirement: in test, in order to obtain the spatial domain phase information, the multichannel input signal source that need to there is strict phase information, need to adopt special aerial array at receiving end, and the accurate calibration phase center, therefore, current most research is only carried out in the emulation aspect.And carry out in the darkroom environment that the test in reality is often strictly controlled in electromagnetic interference (EMI), the defect of this mode is that area occupied is large, interference space location positioning difficulty, particularly for many interference sources or dynamic test environment, its actual angle position is not easy to control, for the test of system has brought great difficulty.
On the other hand, in the GNSS field, the product that the leading firm of signal simulator (as Spirent) etc. is provided is designed for navigation satellite signal mostly, and the simulator of undesired signal is not provided.In order to solve the test problem of interference mitigation technology, German NASA (DLR) once utilized GNSS signal simulator (Spirent STR 4790) to develop the multichannel GNSS signal source with spatial domain phase information.Yet this scheme is owing to need to the phase place of each satellite-signal being adjusted, very difficult and design is complicated, common lab is difficult to reach.
Summary of the invention
The deficiency existed in order to solve prior art, the present invention is directed to the interference mitigation technology based on aerial array in the GNSS receiver, proposed a kind ofly without adjusting the GNSS signal phase and experimental situation being suppressed to the module chamber built-in test system without the interference of excessive demand, this system can be from the interference suppression algorithm performance of different phase checking based on aerial array.
In order to solve the problems of the technologies described above, the present invention adopts following technical scheme:
1, a kind of GNSS's disturbs based on aerial array the indoor test system that suppresses module, be used for testing the interference suppression algorithm performance, comprise connected successively control module, multi-channel digital undesired signal generation unit, disturb and suppress processing unit and disturb the rejection analytic unit; Described multi-channel digital undesired signal generation unit is used for producing
nroad intermediate frequency digital interference signal, comprise clock module, modulation signal generation module, digital modulation module and digital frequency synthesizer, the modulation signal generation module all is connected with control module with digital frequency synthesizer, the output terminal of clock module is connected with modulation signal generation module, digital modulation module and digital frequency synthesizer respectively, the output terminal of modulation signal generation module and digital frequency synthesizer is connected from the different input ends of digital modulation module respectively, and the output terminal of digital modulation module connects the input end that disturbs the inhibition processing unit.
The operator can control modulation signal generation module and digital frequency synthesizer by control module, thereby realizes the type of the artificial intermediate frequency digital interference signal of selecting multi-channel digital undesired signal generation unit to produce.
The interference based on aerial array that it is GNSS that above-mentioned interference suppresses processing unit suppresses module, be interference suppression algorithm to be tested, this unit can utilize airspace filter, when empty or the general interference suppression algorithm based on aerial array such as empty self-adaptive processing frequently multi-channel digital undesired signal generation unit is produced
nroad intermediate frequency digital interference signal is processed, and reaches and suppresses the purpose of disturbing, and the digital signal after processing enters disturbs the rejection analytic unit.
Above-mentioned interference rejection analytic unit is used for Analysis interference and suppresses the interference rejection of processing unit, can adopt the mode such as empty frequency spectrum to through disturbing, suppressing processing unit and disturbs the signal after suppressing to process to be analyzed, thus the interference rejection of acquisition interference suppression algorithm.Disturbing the concrete manifestation form of rejection analytic unit is frequency spectrograph or oscillograph, also can carry out the subsequent treatment energy by data acquisition modes.
2, a kind of GNSS's disturbs based on aerial array the indoor test system that suppresses module, be used for testing the impact of analog to digital conversion on the interference suppression algorithm performance, comprise connected successively control module, multi-channel digital undesired signal generation unit, hyperchannel D/A conversion unit, hyperchannel AD conversion unit, disturb and suppress processing unit, interference rejection analytic unit.
Above-mentioned hyperchannel D/A conversion unit is controlled by same clock module
nindividual digital to analog converter (Digital to Analog Converter, DAC), be mainly used to hyperchannel multi-channel digital undesired signal generation unit is produced
nroad intermediate frequency digital interference signal is transformed to the intermediate frequency simulaed interference signal, and keeps
nin road, the phase relation of frequency interference signal is constant.
Above-mentioned hyperchannel AD conversion unit is controlled by same clock module
nindividual analog to digital converter (Analog to Digital Converter, ADC), be mainly used to the hyperchannel D/A conversion unit is produced
nroad intermediate frequency simulaed interference signal sampling, and will
nroad intermediate frequency simulaed interference signal is transformed to
nroad intermediate frequency digital interference signal, conversion obtains
nroad intermediate frequency digital interference signal is as disturbing the input signal that suppresses processing unit.
3, a kind of GNSS's disturbs based on aerial array the indoor test system that suppresses module, being used for testing radio frequency processes the impact on the interference suppression algorithm performance, comprises connected successively control module, multi-channel digital undesired signal generation unit, hyperchannel D/A conversion unit, hyperchannel up-conversion unit, hyperchannel down-converter unit, hyperchannel AD conversion unit, disturbs and suppress processing unit, disturb the rejection analytic unit.
Above-mentioned hyperchannel up-conversion unit produces the hyperchannel D/A conversion unit
nthe road intermediate frequency simulaed interference signal uppermixing radio frequency band corresponding to GNSS, and keep the amplitude of each road signal and phase relation constant.This unit mainly comprises interconnective local oscillator generation module and hyperchannel uppermixing circuit, and wherein, local oscillator generation module comprises successively connected FPGA control interface, local oscillator generator, radio-frequency power amplifier and multi-path power divider.The FPGA control interface is connected with the input end of local oscillator generator, and controls local oscillator generator generation radiofrequency signal; The output radiofrequency signal of local oscillator generator is connected with multi-path power divider after amplifying by radio-frequency power amplifier, multi-path power divider output
nthe road local oscillation signal; Hyperchannel uppermixing circuit utilizes local oscillator generation module to produce
nthe road local oscillation signal is exported the hyperchannel D/A conversion unit
nroad intermediate frequency simulaed interference signal upconverts to the frequency range that GNSS is corresponding.Hyperchannel uppermixing circuit comprises
nindividual upper frequency mixer,
nindividual SAW(Surface Acoustic Wave, surface acoustic wave) wave filter and
nindividual radio-frequency power amplifier,
nthe input end of individual upper frequency mixer and the output of hyperchannel D/A conversion unit
nroad intermediate frequency simulaed interference signal and local oscillator generation module produce
nthe road local oscillation signal all is connected,
nthe output terminal of individual upper frequency mixer respectively with
nthe input end of individual SAW wave filter is connected, the output terminal of SAW wave filter respectively with
nthe input end of individual radio-frequency power amplifier is connected, and by
nindividual radio-frequency power amplifier output is mixed
nroad radio frequency analog undesired signal.
Above-mentioned hyperchannel down-converter unit is exported hyperchannel up-conversion unit
nroad radio frequency analog undesired signal is down-converted to required Mid Frequency, and keep the amplitude of each road signal and phase relation constant.This unit mainly comprises mixting circuit under interconnective local oscillator generation module and hyperchannel, and local oscillator generation module is identical with the local oscillator generation module in hyperchannel up-conversion unit, does not repeat them here.Under hyperchannel, mixting circuit utilizes the multichannel local oscillation signal of local oscillator generation module generation that hyperchannel uppermixing unit is exported
nroad radio frequency analog undesired signal is down-converted to intermediate-frequency band.This main circuit will comprise
nindividual down-conversion mixer,
nindividual intermediate-frequency filter and
nindividual IF power amplifier,
nthe input end of individual down-conversion mixer and the output of hyperchannel up-conversion unit
nroad radio frequency analog undesired signal and local oscillator generation module produce
nthe road local oscillation signal all is connected,
nthe output terminal of individual down-conversion mixer respectively with
nthe input end of individual intermediate-frequency filter is connected, the output terminal of intermediate-frequency filter respectively with
nthe input end of individual IF power amplifier is connected, and by
nindividual IF power amplifier output is mixed
nroad intermediate frequency simulaed interference signal.
4, a kind of GNSS disturbs based on aerial array the indoor test system that suppresses module, be used for testing the impact of interference suppression algorithm on positioning performance, comprise control module, multi-channel digital undesired signal generation unit, the hyperchannel D/A conversion unit, hyperchannel up-conversion unit, the GNSS signal receiving unit, hyperchannel radiofrequency signal assembled unit, the hyperchannel down-converter unit, the hyperchannel AD conversion unit, disturb and suppress processing unit, Base-Band Processing positioning calculation unit and interference rejection analytic unit, control module, multi-channel digital undesired signal generation unit, the hyperchannel D/A conversion unit, hyperchannel up-conversion unit, hyperchannel radiofrequency signal assembled unit, the hyperchannel down-converter unit, the hyperchannel AD conversion unit, disturb and suppress processing unit, disturb the rejection analytic unit to be connected successively, Base-Band Processing positioning calculation unit is connected with disturbing the inhibition processing unit, the GNSS signal receiving unit is connected with hyperchannel radiofrequency signal assembled unit.
Above-mentioned GNSS signal receiving unit comprises connected successively antenna, low noise amplifier, power splitter, and wherein, antenna is used for receiving the GNSS signal, and the signal received is connected with power splitter by after low noise amplifier, and power splitter is divided into the GNSS signal merit after amplifying
nbehind road, send into hyperchannel radiofrequency signal assembled unit.
Above-mentioned hyperchannel radiofrequency signal assembled unit is mainly signal combiner, and it can produce hyperchannel up-conversion unit
nroad radio frequency analog undesired signal with
nroad GNSS signal synthesizes
nthe road mixed signal, and it is sent into to the input end of hyperchannel down-converter unit.
Above-mentioned Base-Band Processing positioning calculation unit comprises trapping module, tracking module and positioning calculation module, wherein, trapping module completes the code phase of GNSS signal and the coarse search of carrier wave frequency information, result after search enters tracking module, the further refinement code phase of tracking module, carrier frequency and phase information, and extracting the observed quantity information for location, last positioning calculation module utilizes observed quantity information to calculate the receiver antenna position.
In instructions of the present invention, occur
nmean to be not less than 2 integer.
Compared with prior art, major advantage of the present invention is:
1, the present invention adopts the hardware simulation multichannel to have the undesired signal of space phase information, can reach angle to quantity, interference type, the ripple of interference source and other any scenes are carried out flexible modeling, particularly there is the modeling under the dynamic change scene, thus the rejection of Analysis interference Restrainable algorithms under these scenes.Therefore, the invention solves that many interference sources in aerial array interference suppression algorithm test are difficult to produce, experimental situation requires too high technical matters.
2 compare with the method for existing employing software emulation test interference suppression algorithm performance, and the interference suppression algorithm of the present invention's test all runs in actual hardware system, therefore can react more really interference suppression algorithm performance quality in actual applications.
3, system of the present invention can be tested by selecting the stages to disturbing inhibition to process, thereby analyzes respectively the impact of the processing in each stage in actual interference inhibition system on the interference suppression algorithm performance.
4, system of the present invention can utilize a GNSS signal simulator or cheap GNSS signal repeater test GNSS receiving system to disturb the positioning performance after suppressing to process, and reaches in the indoor test interference suppression algorithm, and realizes the purpose of location.The present invention efficiently solves the problem of interference mitigation technology test condition harshness in the GNSS receiving system, can effectively advance development and the application of GNSS interference mitigation technology, thereby improves the national defence ability of China.
The accompanying drawing explanation
The structured flowchart that Fig. 1 is embodiment 1;
The structured flowchart that Fig. 2 is multi-channel digital undesired signal generation unit;
The structured flowchart that Fig. 3 is embodiment 2;
The structured flowchart that Fig. 4 is embodiment 3;
The structured flowchart that Fig. 5 is local oscillator generation module;
The circuit theory diagrams that Fig. 6 is the hyperchannel uppermixing;
The circuit theory diagrams that Fig. 7 is the hyperchannel down coversion;
The structured flowchart that Fig. 8 is embodiment 4;
The test result that Fig. 9 is embodiment 1;
The test result that Figure 10 is embodiment 3.
Embodiment
Test macro of the present invention, can realize four kinds of test functions: test interference suppression algorithm performance, test analog to digital conversion be the impact on positioning performance on the impact of interference suppression algorithm performance and test interference suppression algorithm on the impact of interference suppression algorithm, testing radio frequency.Below in conjunction with drawings and Examples, for above-mentioned four kinds of test functions, be described in detail respectively.
Embodiment 1
Fig. 1 is base band algorithm performance test macro of the present invention, and this system is used for testing the interference suppression algorithm performance, comprises connected successively control module, multi-channel digital undesired signal generation unit, disturbs and suppress processing unit, interference rejection analytic unit.The structured flowchart that Fig. 2 is multi-channel digital undesired signal generation unit, multi-channel digital undesired signal generation unit, under the control of control module, produces and to have fixed phase relationship
nroad intermediate frequency digital interference signal,
nfor being not less than 2 integer.Multi-channel digital undesired signal generation unit comprises clock module, modulation signal generation module, digital frequency synthesizer and digital modulation module.
Clock module provides corresponding clock frequency for modulation signal generation module, digital frequency synthesizer and digital modulation module as required, the crystal oscillator that is input as a 10MHz of clock module in the present embodiment.The modulation signal generation module, under the control of control module and clock module, produces and to have fixed phase relationship
nroadbed band output signal, should
nroadbed band output signal is respectively with digital modulation module
nthe road first input end is connected.The modulation signal generation module produces
nthe principle of roadbed band output signal is: interference number M and the array antenna definite according to control module are exported number N, form the plural steering vector matrix of a N*M dimension, under the control of clock module, the plural undesired signal of this plural number steering vector matrix and M road is multiplied each other and obtains the synthetic complex baseband digital interference signal in N road.Digital frequency synthesizer produces under control module and clock module control
nthe duplicate intercarrier signal in road, should
nthe road intercarrier signal is respectively with digital modulation module
nroad the second input end is connected.The output of modulation signal generation module
nroadbed band signal and digital frequency synthesizer produce
nthe road intercarrier signal multiplies each other in digital modulation module, obtains
nroad has the intermediate frequency digital interference signal of fixed phase relationship.The digital frequency synthesizer of the present embodiment is conventional device, can produce as required the standard sine carrier wave of fixed frequency.
The workflow of the present embodiment test macro is as follows:
Set the undesired signal type by control module according to actual needs, the type to undesired signal in the present embodiment is also unrestricted, for example, can set quantity, frequency, bandwidth, modulation type, signal to noise ratio (S/N ratio), jamming-to-signal ratio and the incident angle etc. of undesired signal.Multi-channel digital undesired signal generation unit is according to the instruction of control module, produces and meets the fixed phase relationship that has of setting type
nroad intermediate frequency digital interference signal.Detailed process is: undesired signal quantity, frequency, bandwidth, modulation type, signal to noise ratio (S/N ratio), jamming-to-signal ratio and the incident angle etc. according to control module, set, and the modulation signal generation module in multi-channel digital undesired signal generation unit produces M road complex base band signal; The undesired signal incident angle (comprising the angle of pitch and position angle) of setting according to control module, the modulation signal generation module produces the plural steering vector matrix of N*M dimension, it is the steering vector matrix, by steering vector matrix and M road complex base band signal signal multiplication, obtain N road complex baseband signal, i.e. N roadbed band digital interference signal.This N roadbed band digital interference and signal and digital frequency synthesizer produce
nthe road intercarrier signal multiplies each other in digital modulation module, obtains
nroad has the intermediate frequency digital interference signal of fixed phase relationship.
Disturb and suppress to store interference suppression algorithm to be tested in processing unit, can be for airspace filter, when empty or the general interference suppression algorithm based on array such as empty self-adaptive processing frequently, disturb the interference suppression algorithm that suppresses in processing unit to the output of multi-channel digital undesired signal generation unit
nroad intermediate frequency digital interference signal suppresses to process, and the digital signal after processing enters disturbs the rejection analytic unit, by disturbing the rejection analytic unit, analyzes the interference rejection of interference suppression algorithm to be tested.
Disturbing rejection analytic unit concrete manifestation form can be frequency spectrograph or oscillograph, carry out subsequent treatment after also can collecting data by data acquisition modes, specifically can utilize the mode such as empty frequency spectrum to gather through disturbing the signal suppressed to be analyzed, thereby analyze the performance of various interference suppression algorithm.
Embodiment 2
Fig. 3 is analog to digital conversion performance impact test subsystems of the present invention, and this system is used for testing the impact of analog to digital conversion on the interference suppression algorithm performance.On the basis of embodiment 1 system, the present embodiment system has increased hyperchannel D/A conversion unit and hyperchannel AD conversion unit, and other all do not make change, thereby can test digital-to-analog conversion and analog to digital conversion to disturbing the impact of rejection.The present embodiment system mainly comprises connected successively control module, multi-channel digital undesired signal generation unit, hyperchannel D/A conversion unit, hyperchannel AD conversion unit, disturbs and suppress processing unit, disturb the inhibition processing unit and disturb the rejection analytic unit.Identical with in embodiment 1 of multi-channel digital undesired signal generation unit, see Fig. 2.
The hyperchannel D/A conversion unit is by controlled by same clock module
nindividual digital to analog converter (DAC) forms, and multi-channel digital undesired signal generation unit is produced
nroad intermediate frequency digital interference signal is transformed to
nroad intermediate frequency simulaed interference signal, and keep
nthe phase relation of road intermediate-freuqncy signal is constant.
The hyperchannel AD conversion unit comprises and controlled by same clock module
nindividual analog to digital converter (ADC), right
nroad intermediate frequency simulaed interference signal sampling, change it into
nroad intermediate frequency digital interference signal, conversion obtains
nroad intermediate frequency digital interference signal enters to disturb as input signal and suppresses processing unit.Disturb inhibition processing unit and performance evaluation unit all with embodiment 1.
Embodiment 3
Fig. 4 is that radio frequency of the present invention affects test subsystems, and this system is used for testing radio frequency and processes the impact on interference suppression algorithm.On the basis of embodiment 2 systems, the present embodiment system has increased hyperchannel up-conversion unit and hyperchannel down-converter unit, and other all do not make change, thereby the testing radio frequency end is processed disturbing the impact of rejection more truly.The present embodiment comprises connected successively control module, multi-channel digital undesired signal generation unit, hyperchannel D/A conversion unit, hyperchannel up-conversion unit, hyperchannel down-converter unit, hyperchannel AD conversion unit, disturbs and suppresses processing unit, interference rejection analytic unit.
Hyperchannel up-conversion unit produces the hyperchannel D/A conversion unit
nthe road intermediate frequency simulaed interference signal uppermixing radio frequency band corresponding to GNSS, and keep the amplitude of each road signal and phase relation constant.For each road signal, for the assurance amplitude and phase relation constant, the device require adopted is consistent, and adopts same clock source, and guarantees that in circuit design, wiring length is consistent.After completing, also can to passage consistency, be calibrated by collimation technique circuit production.This unit mainly comprises interconnective local oscillator generation module and hyperchannel uppermixing circuit, sees Fig. 5.Local oscillator generation module comprises successively connected FPGA control interface, local oscillator generator, radio-frequency power amplifier, multi-path power divider, and the FPGA control interface is connected with the input end of local oscillator generator, and controls local oscillator generator generation radiofrequency signal; The output radiofrequency signal of local oscillator generator is connected with multi-path power divider after amplifying by radio-frequency power amplifier, multi-path power divider output
nthe road local oscillation signal.See Fig. 6, the multichannel local oscillation signal that hyperchannel uppermixing circuit utilizes local oscillator generation module to produce upconverts to by frequency interference signal in the multi-channel analog of hyperchannel D/A conversion unit output the frequency range that GNSS is corresponding.This main circuit will by
nindividual upper frequency mixer,
nindividual SAW wave filter and
nindividual radio-frequency power amplifier forms,
nthe input end of individual upper frequency mixer and the output of hyperchannel D/A conversion unit
nroad intermediate frequency simulaed interference signal and local oscillator generation module produce
nthe road local oscillation signal all is connected,
nthe output terminal of individual upper frequency mixer respectively with
nthe input end of individual SAW wave filter is connected, the output terminal of SAW wave filter respectively with
nthe input end of individual radio-frequency power amplifier is connected, and by
nindividual radio-frequency power amplifier output is mixed
nroad radio frequency analog undesired signal.The local oscillation signal that the intermediate frequency simulaed interference signal of hyperchannel D/A conversion unit output and local oscillator generation module produce is mixed to get radiofrequency signal in upper frequency mixer, and mixed radiofrequency signal is input hyperchannel down-converter unit after SAW filter filtering, radio-frequency power amplifier amplify.
The effect of hyperchannel down-converter unit is by mixed
nroad radio frequency analog undesired signal is down-converted to required Mid Frequency, and keep the amplitude of each road signal and phase relation constant.This unit mainly comprises mixting circuit under interconnective local oscillator generation module and hyperchannel, and local oscillator generation module is identical with the local oscillator generation module in hyperchannel up-conversion unit, does not repeat them here.See Fig. 7, the multichannel local oscillation signal that under hyperchannel, mixting circuit utilizes local oscillator generation module to produce is down-converted to intermediate-frequency band by the multi-channel rf simulating signal of hyperchannel uppermixing unit output.This main circuit will by
nindividual down-conversion mixer,
nindividual intermediate-frequency filter and
nindividual IF power amplifier forms,
nthe input end of individual down-conversion mixer and the output of hyperchannel up-conversion unit
nroad radio frequency analog undesired signal and local oscillator generation module produce
nthe road local oscillation signal all is connected,
nthe output terminal of individual down-conversion mixer respectively with
nthe input end of individual intermediate-frequency filter is connected, the output terminal of intermediate-frequency filter respectively with
nthe input end of individual IF power amplifier is connected, and by
nindividual IF power amplifier output is mixed
nroad intermediate frequency simulaed interference signal.The output of hyperchannel up-conversion unit
nroad radio frequency analog undesired signal and local oscillator generation module produce
nthe road local oscillation signal is mixed to get intermediate-freuqncy signal in down-conversion mixer, and mixed intermediate-freuqncy signal is input hyperchannel AD conversion unit after intermediate-frequency filter filtering, IF power amplifier amplify.
During work, the output of hyperchannel D/A conversion unit
nroad intermediate frequency simulaed interference signal, change the GNSS radio band into by hyperchannel up-conversion unit
nthe road undesired signal, then, change into through the hyperchannel down-converter unit
nthe road analog intermediate frequency signal, send into the hyperchannel AD conversion unit.In this way, can test the consistance of frequency mixer in actual anti-interference GNSS receiving system and on disturbing the impact of rejection.
Embodiment 4
Fig. 8 is that interference of the present invention suppresses positioning performance is affected to test subsystems, is used for testing the impact of interference suppression algorithm on positioning performance.On the basis of embodiment 3 systems, the present embodiment system has increased GNSS radiofrequency signal generation unit, hyperchannel radiofrequency signal assembled unit and Base-Band Processing positioning calculation unit, and other all do not make change.Above-mentioned GNSS radiofrequency signal generation unit is GNSS signal simulator or cheap GNSS signal repeater.The present embodiment system comprises control module, multi-channel digital undesired signal generation unit, the hyperchannel D/A conversion unit, hyperchannel up-conversion unit, the GNSS signal receiving unit, hyperchannel radiofrequency signal assembled unit, the hyperchannel down-converter unit, the hyperchannel AD conversion unit, disturb and suppress processing unit, Base-Band Processing positioning calculation unit and interference rejection analytic unit, control module, multi-channel digital undesired signal generation unit, the hyperchannel D/A conversion unit, hyperchannel up-conversion unit, hyperchannel radiofrequency signal assembled unit, the hyperchannel down-converter unit, the hyperchannel AD conversion unit, disturb and suppress processing unit, the performance evaluation unit is connected successively, Base-Band Processing positioning calculation unit is connected with disturbing the inhibition processing unit, the GNSS signal receiving unit is connected with hyperchannel radiofrequency signal assembled unit.
GNSS radiofrequency signal unit mainly comprises connected successively antenna, low noise amplifier, power splitter, and wherein, antenna is used for receiving the GNSS signal, and the signal received is connected by power splitter after low noise amplifier, and power splitter is divided into the GNSS signal merit after amplifying
nbehind road, send into hyperchannel radiofrequency signal assembled unit.
Hyperchannel radiofrequency signal assembled unit is mainly a plurality of signal combiner, can adopt the BP2G1+ chip, and it can produce hyperchannel up-conversion unit
nroad radio frequency analog undesired signal with
nroad GNSS signal synthesizes
nthe road mixed signal, and it is sent into to the input end of hyperchannel down-converter unit.
Base-Band Processing positioning calculation unit comprises trapping module, tracking module and positioning calculation module, wherein, trapping module completes the code phase of GNSS signal and the coarse search of carrier wave frequency information, result after search enters tracking module, the further refinement code phase of tracking module, carrier frequency and phase information, and extracting the observed quantity information for location, last positioning calculation module utilizes observed quantity information to calculate GNSS receiver antenna position.
Due to the general 20-30dB under noise of GNSS signal, therefore interference suppression algorithm commonly used is not all exerted an influence.In this way, can suppress and realize location indoor the interference, and the impact of rejection on positioning performance be disturbed in test.
Adopt embodiment 1 system, disturbing the interference suppression algorithm to be tested suppressed in processing unit is spatial domain filter algorithms, disturb the signal to noise ratio (S/N ratio) that suppresses unit to be-25dB, wherein, array antenna is modeled as four uniform straight line arrays, interference is set to a broadband interference and two continuous waves (Continuous Wave Interference, CWI) arrowband and disturbs, and broadband interference takes whole processing bandwidth and from-20
oincide array, CWI is respectively with respect to the skew of centre frequency :-0.1786MHz and 0.7143MHz, incident angle is respectively 30
owith 70
o, noisy jamming-to-signal ratio (Interfernece to Signal Ratio, ISR) all is taken as-50dB.Fig. 9 is the SOP(airspace filter) under algorithm, system of the present invention is utilized the FPGA fixed-point implementation to obtain the formed beam patterns of weights (seeing Fig. 9 (a)) and is contrasted with the beam pattern (seeing Fig. 9 (b)) that emulation generates based on MatLab, can find out, in real system because FPGA adopts fixed-point implementation, the operations such as its data cutout have brought impact a little to system performance, and its zero sunken degree of depth is dark not as the beam pattern that MatLab generates.
Adopt embodiment 3 systems, disturbing the tape test algorithm suppressed in processing unit is based on the space-time adaptive Processing Algorithm.The undesired signal that multi-channel digital undesired signal generator produces is that frequency modulation disturbs, and utilizes the sine wave of 20KHz to be modulated the carrier wave of 1.57542GHz, and frequency deviation is each 1MHz of left and right.The output signal spectrum figure of the radio-frequency power amplifier that Figure 10 (a) is hyperchannel up-conversion output unit, can find out that undesired signal peak value in the frequency range of 2MHz is-70dBm left and right, and noise floor is in-110dBm left and right.Figure 10 (b) and Figure 10 (c) are respectively and disturb the estimated disturbance signal frequency spectrum that suppresses processing unit output and reject the residual signal frequency spectrum after disturbing.As can be seen from the figure, disturb the inhibition processing unit to disturb and carried out effective estimation and rejecting frequency modulation, estimate that interference power peak is-the 30dBm left and right, the frequency spectrum of noise signals of output is substantially flat in the bandwidth of 2MHz, be about-60dBm of power.
Claims (7)
1.GNSS disturb to suppress the indoor test system of module based on aerial array, it is characterized in that:
Comprise connected successively control module, multi-channel digital undesired signal generation unit, disturb and suppress processing unit and disturb the rejection analytic unit, control module is used for controlling the type of the intermediate frequency digital interference signal that multi-channel digital undesired signal generation unit produces, multi-channel digital undesired signal generation unit is used for producing multichannel intermediate frequency digital interference signal, the interference based on aerial array that it is GNSS that interference suppresses processing unit suppresses module, the multichannel intermediate frequency digital interference signal that is used for that multi-channel digital undesired signal generation unit is produced suppresses to process, disturb the rejection analytic unit to be used for Analysis interference and suppress the interference rejection of processing unit,
Described multi-channel digital undesired signal generation unit comprises clock module, modulation signal generation module, digital modulation module and digital frequency synthesizer, the output terminal of clock module is connected with modulation signal generation module, digital modulation module and digital frequency synthesizer respectively, the output terminal of modulation signal generation module and digital frequency synthesizer is connected from the different input ends of digital modulation module respectively, and the output terminal of digital modulation module connects the input end that disturbs the inhibition processing unit.
2. the interference based on aerial array of GNSS as claimed in claim 1 suppresses the indoor test system of module, it is characterized in that:
Also comprise hyperchannel D/A conversion unit and hyperchannel AD conversion unit, the input end of described hyperchannel D/A conversion unit, output terminal are connected with the output terminal of multi-channel digital undesired signal generation unit, the input end of hyperchannel AD conversion unit respectively, and the output terminal of hyperchannel AD conversion unit connects the input end that disturbs the inhibition processing unit.
3. the interference based on aerial array of GNSS as claimed in claim 2 suppresses the indoor test system of module, it is characterized in that:
Described hyperchannel D/A conversion unit is a plurality of digital to analog converters that controlled by same clock module, and described hyperchannel AD conversion unit is a plurality of analog to digital converters that controlled by same clock module.
4. the interference based on aerial array of GNSS as claimed in claim 2 suppresses the indoor test system of module, it is characterized in that:
Also comprise hyperchannel up-conversion unit and hyperchannel down-converter unit, the input end of described hyperchannel up-conversion unit, output terminal are connected with the output terminal of hyperchannel D/A conversion unit, the input end of hyperchannel down-converter unit respectively, and the output terminal of hyperchannel down-converter unit is connected with the input end of hyperchannel AD conversion unit.
5. the interference based on aerial array of GNSS as claimed in claim 4 suppresses the indoor test system of module, it is characterized in that:
Described hyperchannel up-conversion unit comprises interconnective local oscillator generation module and hyperchannel uppermixing circuit, and, described hyperchannel down-converter unit comprises mixting circuit under interconnective local oscillator generation module and hyperchannel, wherein, local oscillator generation module includes successively connected FPGA control interface, local oscillator generator, radio-frequency power amplifier and multi-path power divider; Hyperchannel uppermixing circuit comprises a plurality of upper frequency mixers, a plurality of SAW wave filter and a plurality of radio-frequency power amplifier, the output terminal of a plurality of upper frequency mixers is connected with the input end of a plurality of SAW wave filters respectively, the output terminal of SAW wave filter is connected with the input end of a plurality of radio-frequency power amplifiers respectively, and described upper frequency mixer also is connected with the output terminal of hyperchannel D/A conversion unit; Under hyperchannel, mixting circuit comprises a plurality of down-conversion mixers, a plurality of intermediate-frequency filter and a plurality of IF power amplifier, the output terminal of a plurality of down-conversion mixers is connected with the input end of a plurality of intermediate-frequency filters respectively, the output terminal of intermediate-frequency filter is connected with the input end of a plurality of IF power amplifiers respectively, and described down-conversion mixer also is connected with the output terminal of hyperchannel up-conversion unit.
6. the interference based on aerial array of GNSS as claimed in claim 4 suppresses the indoor test system of module, it is characterized in that:
Also comprise GNSS signal receiving unit, hyperchannel radiofrequency signal assembled unit and Base-Band Processing positioning calculation unit, the input of hyperchannel radiofrequency signal assembled unit, output terminal are connected with the output terminal of hyperchannel up-conversion unit, the input end of hyperchannel down-converter unit respectively, hyperchannel radiofrequency signal assembled unit also is connected with the output terminal of GNSS signal receiving unit, and Base-Band Processing positioning calculation unit is connected with disturbing the inhibition processing unit.
7. suppress the indoor test system of module as the interference based on aerial array of the described GNSS of any one in claim 1～6, it is characterized in that:
Described interference rejection analytic unit adopts the signal after empty frequency spectrum mode Analysis interference suppresses to process.
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| CN107329109B (en) * | 2017-06-21 | 2020-04-03 | 中国电子科技集团公司第三十六研究所 | Array signal receiving method and device |
| CN107872827B (en) * | 2017-10-31 | 2019-12-13 | 深圳无线电检测技术研究院 | Wireless interference test method and system |
| CN109683519A (en) * | 2018-12-21 | 2019-04-26 | 南京航空航天大学 | A kind of FPGA implementation method of adaptive algorithm |
| CN111510193B (en) * | 2020-03-27 | 2022-03-25 | 中国人民解放军海军工程大学 | Non-cooperative interference suppression device for satellite ground station and control method thereof |
| CN111751858B (en) * | 2020-05-21 | 2024-02-09 | 广州雷迅创新科技股份有限公司 | Unmanned aerial vehicle anti-interference high accuracy navigation module |
| DE102022203260A1 (en) | 2022-03-28 | 2023-09-28 | FH Münster, Körperschaft des öffentlichen Rechts | Receiving system for a global satellite navigation system |
| CN116224406B (en) * | 2023-04-23 | 2024-04-26 | 东南大学 | Low-cost multi-antenna GNSS/INS ultra-tight combined multistage anti-interference system |
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