CN108318898B - A kind of mixing interfering signal suppressing method and system - Google Patents

A kind of mixing interfering signal suppressing method and system Download PDF

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Publication number
CN108318898B
CN108318898B CN201810131172.0A CN201810131172A CN108318898B CN 108318898 B CN108318898 B CN 108318898B CN 201810131172 A CN201810131172 A CN 201810131172A CN 108318898 B CN108318898 B CN 108318898B
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signal
filtering
arrival
matrix
processed
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CN108318898A (en
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范志良
王海洋
姚志成
侯博
李琳琳
席建祥
魏振华
张盛魁
吴智慧
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Rocket Force University of Engineering of PLA
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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
    • G01S19/21—Interference related issues ; Issues related to cross-correlation, spoofing or other methods of denial of service
    • G01S19/215—Interference related issues ; Issues related to cross-correlation, spoofing or other methods of denial of service issues related to spoofing
    • 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
    • G01S19/35—Constructional details or hardware or software details of the signal processing chain
    • G01S19/37—Hardware or software details of the signal processing chain

Abstract

The present invention discloses a kind of mixing interfering signal suppressing method and system.The method envelope: obtaining signal to be processed, and the signal to be processed includes desired signal, compacting interference signal and curve；Calculate the direction of arrival of the desired signal；Calculate the direction of arrival of the compacting interference signal；Matrix filtering is carried out to the signal to be processed according to the direction of arrival of the desired signal, obtains the first filtering signal；Oblique projection filtering is carried out to first filtering signal according to the direction of arrival of the direction of arrival of the compacting interference signal and the desired signal, obtains the second filtering signal；Matched filtering is carried out to second filtering signal.The present invention can inhibit curve and compacting interference signal simultaneously, improve the inhibitory effect of mixing interference signal.

Description

A kind of mixing interfering signal suppressing method and system
Technical field
The present invention relates to field of wireless communication, more particularly to a kind of mixing interfering signal suppressing method and system.
Background technique
Satellite navigation because of its positioning accuracy height, and not at any time accumulated error the advantages of obtained in weapon system it is wide General application.But satellite navigation signals power is generally 20dB also lower than noise signal, therefore is highly prone to attack interference, this Global Navigation Satellite System (Global Navigation Satellite System, GNSS) receiver will be made not catch normally Obtain track navigation satellite.For this problem, the GNSS receiver that weapon system carries generallys use array antenna and presses down in airspace Interference signal processed.
Although the existing anti-interference restrainable algorithms of array antenna are inhibiting to inhibiting compacting interference signal effect preferable It is not ideal enough in terms of cheating interference signal, and cheating interference signal is often bigger to the harm of weapon system.Therefore, one kind is needed For the mixing interfering signal suppressing method of GNSS receiver, for GNSS receiver to reception in complicated electromagnetic countermeasure environment Signal is handled.
Summary of the invention
The object of the present invention is to provide a kind of mixing interfering signal suppressing method and systems, for improving mixing interference signal Inhibitory effect.
To achieve the above object, the present invention provides following schemes:
A kind of mixing interfering signal suppressing method, the method envelope:
Signal to be processed is obtained, the signal to be processed includes desired signal, compacting interference signal and curve；
Calculate the direction of arrival of the desired signal；
Calculate the direction of arrival of the compacting interference signal；
Matrix filtering is carried out to the signal to be processed according to the direction of arrival of the desired signal, obtains the first filtering letter Number；
According to the direction of arrival of the direction of arrival of the compacting interference signal and the desired signal to first filtering Signal carries out oblique projection filtering, obtains the second filtering signal；
Matched filtering is carried out to second filtering signal.
Optionally, the direction of arrival for calculating the desired signal, specifically includes:
Obtain satellite position；
Obtain the position of receiver antenna and the posture of receiver antenna；
According to the Attitude Calculation of the position and the receiver antenna of the satellite position and the receiver antenna The direction of arrival of desired signal.
Optionally, the direction of arrival of the compacting interference signal is calculated using MUSIC algorithm.
Optionally, the direction of arrival according to the desired signal carries out matrix filtering, tool to the signal to be processed Body includes:
Discrete omnidirectional's steering vector and response coefficient matrix are determined according to the direction of arrival of the desired signal；
Filtering matrix is calculated according to discrete omnidirectional's steering vector and the response coefficient matrix；
Matrix filtering is carried out to the signal to be processed according to the filtering matrix.
Optionally, described that filtering matrix, tool are calculated according to discrete omnidirectional's steering vector and the response coefficient matrix Body formula are as follows:
Wherein, F is filtering matrix, and U is discrete omnidirectional's steering vector, and G is response coefficient matrix,Indicate broad sense inverse operation, Diag indicates that diagonal matrix, a () are steering vector, θKIndicate discrete angular.
Optionally, it is described according to it is described compacting interference signal direction of arrival and the desired signal direction of arrival to institute It states the first filtering signal and carries out oblique projection filtering, specifically include:
Oblique projection operator is calculated according to the direction of arrival of the direction of arrival of the compacting interference signal and the desired signal；
Oblique projection filtering is carried out to first filtering signal using oblique projection operator.
Optionally, the oblique projection operator are as follows:
Wherein, θ1,θ2,…θQFor the direction of arrival for suppressing interference signal, E is oblique projection operator, θ0For the wave of desired signal Up to direction, a () is steering vector, and H indicates Hermit transposition.
Optionally, described that matched filtering is carried out to second filtering signal, it specifically includes: according to the following formula to described Second filtering signal carries out matched filtering: y (t)=aH(θ0)x2(t)；
Wherein, y (t) is the signal after matched filtering, x2It (t) is the second filtering signal, θ0Side is reached for the wave of desired signal To a () is steering vector, and H indicates Hermit transposition.
A kind of mixing interference signal inhibition system, the system envelope:
Signal acquisition module to be processed, for obtaining signal to be processed, the signal to be processed includes desired signal, compacting Interference signal and curve；
The direction of arrival computing module of desired signal, for calculating the direction of arrival of the desired signal；
The direction of arrival computing module for suppressing interference signal, for calculating the direction of arrival of the compacting interference signal；
Matrix filter module, for carrying out matrix filter to the signal to be processed according to the direction of arrival of the desired signal Wave obtains the first filtering signal；
Oblique projection filter module, for being reached according to the direction of arrival of the compacting interference signal and the wave of the desired signal Direction carries out oblique projection filtering to first filtering signal, obtains the second filtering signal；
Matched filtering module, for carrying out matched filtering to second filtering signal.
The specific embodiment provided according to the present invention, the invention discloses following technical effects:
The present invention carries out matrix filtering to signal first, then carries out oblique projection filtering again, and deception can be inhibited to believe simultaneously Number and compacting interference signal, improve mixing interference signal inhibitory effect.
Detailed description of the invention
It in order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, below will be to institute in embodiment Attached drawing to be used is needed to be briefly described, it should be apparent that, the accompanying drawings in the following description is only some implementations of the invention Example, for those of ordinary skill in the art, without any creative labor, can also be according to these attached drawings Obtain other attached drawings.
Fig. 1 is the flow chart of the embodiment of present invention mixing interfering signal suppressing method；
Fig. 2 is the structure chart for the embodiment that present invention mixing interference signal inhibits system.
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete Site preparation description, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts every other Embodiment shall fall within the protection scope of the present invention.
The object of the present invention is to provide a kind of mixing interfering signal suppressing method and systems, for improving mixing interference signal Inhibitory effect.
In order to make the foregoing objectives, features and advantages of the present invention clearer and more comprehensible, with reference to the accompanying drawing and specific real Applying mode, the present invention is described in further detail.
The present invention provides a kind of mixing interfering signal suppressing method for GNSS receiver, Fig. 1 is present invention mixing The flow chart of the embodiment of interfering signal suppressing method.Shown method includes: as shown in Figure 1:
Step 101: obtaining signal to be processed, the signal to be processed includes desired signal, compacting interference signal and deception Signal.
Signal to be processed are as follows:
Wherein θ0For desired signal DOA, s0It (t) is desired signal envelope；θi(i=1,2 ... P) are curve DOA, si It (t) is curve envelope；θj(j=1,2 ... Q) are compacting interference signal DOA, sjIt (t) is compacting interference signal envelope；n(t) Indicate noise signal.A () indicates steering vector.
Step 102: the direction of arrival of the desired signal is calculated, specifically includes the following steps:
Step 1021: obtaining satellite position；
Step 1022: obtaining the position of receiver antenna and the posture of receiver antenna；
Step 1023: according to the posture of the position and the receiver antenna of the satellite position and the receiver antenna Calculate the direction of arrival of the desired signal.
The direction of arrival (DOA) of desired signal can be obtained by prepackage ephemeris and inertial nevigation apparatus.Prepackage ephemeris can obtain Take satellite position, the inertial nevigation apparatus then position of available GNSS receiver antenna and posture can using these parameter informations The DOA of desired signal is calculated.
Step 103: calculating the direction of arrival of the compacting interference signal；The direction of arrival of compacting interference signal can pass through MUSIC (multiple signal classification algorithm) algorithm obtains, due to suppressing interfering signal power Much larger than desired signal, curve and noise, therefore MUSIC algorithm is more effective.
Step 104: matrix filtering being carried out to the signal to be processed according to the direction of arrival of the desired signal, obtains the One filtering signal, specifically includes the following steps:
Step 1041: discrete omnidirectional's steering vector and response coefficient square are determined according to the direction of arrival of the desired signal Battle array；
Step 1042: filtering matrix is calculated according to discrete omnidirectional's steering vector and the response coefficient matrix；Filtering The specific formula of matrix are as follows:
Wherein, F is filtering matrix, and U is discrete omnidirectional's steering vector, and G is response coefficient matrix,Indicate broad sense inverse operation, Diag indicates that diagonal matrix, a () are steering vector, θKFor discrete angular.
Step 1043: matrix filtering, specific formula are as follows: x are carried out to the signal to be processed according to the filtering matrix1 (t)=Fx (t), wherein x1It (t) is the first filtering signal.
The design process of lower mask body introduction design filtering matrix:
Design filtering matrixThat is M × M ties up complex filter matrix, makes it in [θ0-Δθ θ0+ Δ θ] direction On to signal formed passband, in [- 90 θ0-Δθ]∪[θ0+ Δ θ 90] on form stopband, wherein Δ θ indicate half passband width, Optional 5 ° -10 °.Omnidirectional's steering vector matrix after discreteAre as follows:
U=[a (θ1),a(θ2),…,a(θK)] (3)；
Wherein, θK(K=1,2 ...) is that discrete angular can be different values according to precision setting, i.e., (- 90,90) are average It is divided into multiple discrete angulars.
Desired omnidirectional's steering vector after matrix filteringAre as follows:
V=[k1a(θ1) k2a(θ2) … kKa(θK)] (4)；
Wherein, kp(p=1,2 ... K) indicate response coefficient, according to the direction of arrival (DOA) and θ of desired signalKSet G= diag(k1,k2,…kK), it is as follows that filtering matrix is calculated according to least-squares algorithm:
So filtering matrix is to input signal treated data x1(t) are as follows:
Wherein, k0, ki(i=1,2 ... P), kj(j=1,2 ... Q) respectively indicate desired signal after matrix filtering, deception letter Number, suppress the coefficient of interference signal.Since desired signal to be in in passband, curve and compacting interference direction of signal Stopband, therefore k0Close to 1, and ki(i=1,2 ... P) and kj(j=1,2 ... Q) to be much smaller than 1.
Since curve power is slightly above desired signal, ki(i=1,2 ... P) are much smaller than 1 again, therefore after matrix filtering Its power will be substantially less that desired signal, curve have obtained effective inhibition；Throttle signal power will then be much higher than desired signal (can reach 60dB or more), and matrix filtering inhibits out of band signal ability that complete inhibition compacting interference is not achieved, therefore can not neglect Slightly.Therefore x1(t) it can further indicate that are as follows:
Step 105: according to the direction of arrival of the direction of arrival of the compacting interference signal and the desired signal to described First filtering signal carries out oblique projection filtering, obtains the second filtering signal, specifically includes:
Step 1051: being calculated according to the direction of arrival of the direction of arrival of the compacting interference signal and the desired signal oblique Projection operator；
Step 1052: oblique projection filtering is carried out to first filtering signal using oblique projection operator.
Lower mask body introduces the design process of oblique projection operator E:
Design oblique projection operatorAlong desired signal subspace < a (θ0)>, to compacting interference signals subspace< UN> (throttle signal subspace refers to the subspace that all throttle signal steering vectors are opened) is projected.Oblique projection operator Expression formula are as follows:
Wherein, θ1,θ2,…θQFor the direction of arrival for suppressing interference signal, E is oblique projection operator, θ0For the wave of desired signal Up to direction, a () is steering vector, and H indicates Hermit transposition.
Oblique projection operator has the property that
Therefore, to the first filtering signal x1(t) treated data x2(t) are as follows:
As it can be seen that mixing interference is effectively suppressed after being handled by unified algorithm.
Step 106: matched filtering is carried out to second filtering signal.Finally to the second filtering signal x2(t) progress Final output data y (t) is obtained with filtering:
Y (t)=aH(θ0)x2(t)=aH(θ0)EFn(t)+k0aH(θ0)a(θ0)s0(t) (11)。
The present invention uses matrix filtering algorithm to inhibit curve first, although can also carry out simultaneously to compacting interference signal Inhibit, but its rejection ability cannot completely inhibit compacting interference signal.Then oblique projection algorithm is recycled to inhibit compacting interference Signal.The sequence of two methods must be strictly observed to keep signal phase not change.The present invention can inhibit to take advantage of simultaneously Signal and compacting interference signal are deceived, the inhibitory effect of mixing interference signal is improved.
The present invention also provides a kind of mixing interference signals to inhibit system, and Fig. 2 is that present invention mixing interference signal inhibits system The structure chart of the embodiment of system.As shown in Fig. 2, the system envelope:
Signal acquisition module 201 to be processed, for obtaining signal to be processed, the signal to be processed include desired signal, Suppress interference signal and curve；
The direction of arrival computing module 202 of desired signal, for calculating the direction of arrival of the desired signal；
The direction of arrival computing module for suppressing interference signal, for calculating the direction of arrival of the compacting interference signal；
Matrix filter module 203, for carrying out square to the signal to be processed according to the direction of arrival of the desired signal Battle array filtering, obtains the first filtering signal；
Oblique projection filter module 204, for the direction of arrival and the desired signal according to the compacting interference signal Direction of arrival carries out oblique projection filtering to first filtering signal, obtains the second filtering signal；
Matched filtering module 205, for carrying out matched filtering to second filtering signal.
For the system disclosed in the embodiment, since it is corresponded to the methods disclosed in the examples, so the ratio of description Relatively simple, reference may be made to the description of the method.
Used herein a specific example illustrates the principle and implementation of the invention, and above embodiments are said It is bright to be merely used to help understand method and its core concept of the invention；At the same time, for those skilled in the art, foundation Thought of the invention, there will be changes in the specific implementation manner and application range.In conclusion the content of the present specification is not It is interpreted as limitation of the present invention.

Claims (9)

1. a kind of mixing interfering signal suppressing method, which is characterized in that the method envelope:
Signal to be processed is obtained, the signal to be processed includes desired signal, compacting interference signal and curve；
Calculate the direction of arrival of the desired signal；
Calculate the direction of arrival of the compacting interference signal；
Matrix filtering is carried out to the signal to be processed according to the direction of arrival of the desired signal, obtains the first filtering signal；
According to the direction of arrival of the direction of arrival of the compacting interference signal and the desired signal to first filtering signal Oblique projection filtering is carried out, the second filtering signal is obtained；
Matched filtering is carried out to second filtering signal.
2. mixing interfering signal suppressing method according to claim 1, which is characterized in that described to calculate the desired signal Direction of arrival, specifically include:
Obtain satellite position；
Obtain the position of receiver antenna and the posture of receiver antenna；
It is expected according to the Attitude Calculation of the position and the receiver antenna of the satellite position and the receiver antenna The direction of arrival of signal.
3. mixing interfering signal suppressing method according to claim 1, which is characterized in that calculate institute using MUSIC algorithm State the direction of arrival of compacting interference signal.
4. mixing interfering signal suppressing method according to claim 1, which is characterized in that described according to the desired signal Direction of arrival matrix filtering is carried out to the signal to be processed, specifically include:
Discrete omnidirectional's steering vector and response coefficient matrix are determined according to the direction of arrival of the desired signal；
Filtering matrix is calculated according to discrete omnidirectional's steering vector and the response coefficient matrix；
Matrix filtering is carried out to the signal to be processed according to the filtering matrix.
5. mixing interfering signal suppressing method according to claim 4, which is characterized in that described according to the discrete omnidirectional Steering vector and the response coefficient matrix calculate filtering matrix, specific formula are as follows:
Wherein, F is filtering matrix, and U is discrete omnidirectional's steering vector, and G is response coefficient matrix,Indicate broad sense inverse operation, diag Indicate that diagonal matrix, a () are steering vector, θKIndicate discrete angular.
6. mixing interfering signal suppressing method according to claim 1, which is characterized in that described to be interfered according to the compacting The direction of arrival of the direction of arrival of signal and the desired signal carries out oblique projection filtering to first filtering signal, specific to wrap It includes:
Oblique projection operator is calculated according to the direction of arrival of the direction of arrival of the compacting interference signal and the desired signal；
Oblique projection filtering is carried out to first filtering signal using oblique projection operator.
7. mixing interfering signal suppressing method according to claim 6, which is characterized in that the oblique projection operator are as follows:
Wherein, θ1,θ2,…θQFor the direction of arrival for suppressing interference signal, E is oblique projection operator, θ0Side is reached for the wave of desired signal To a () is steering vector, and H indicates Hermit transposition.
8. mixing interfering signal suppressing method according to claim 1, which is characterized in that described to believe second filtering Number carry out matched filtering, specifically include: according to the following formula to second filtering signal carry out matched filtering: y (t)=aH (θ0)x2(t)；
Wherein, y (t) is the signal after matched filtering, x2It (t) is the second filtering signal, θ0For the direction of arrival of desired signal, a () For steering vector, H indicates Hermit transposition.
9. a kind of mixing interference signal inhibits system, which is characterized in that the system envelope:
Signal acquisition module to be processed, for obtaining signal to be processed, the signal to be processed includes desired signal, compacting interference Signal and curve；
The direction of arrival computing module of desired signal, for calculating the direction of arrival of the desired signal；
The direction of arrival computing module for suppressing interference signal, for calculating the direction of arrival of the compacting interference signal；
Matrix filter module, for carrying out matrix filtering to the signal to be processed according to the direction of arrival of the desired signal, Obtain the first filtering signal；
Oblique projection filter module, for according to the direction of arrival of the compacting interference signal and the direction of arrival of the desired signal Oblique projection filtering is carried out to first filtering signal, obtains the second filtering signal；
Matched filtering module, for carrying out matched filtering to second filtering signal.
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