CN109709523A - A kind of urban architecture environment clutter suppression method of WiFi passive radar - Google Patents
A kind of urban architecture environment clutter suppression method of WiFi passive radar Download PDFInfo
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Abstract
The present invention discloses a kind of urban architecture environment clutter suppression method of WiFi passive radar, applied to passive radar clutter recognition field, for the problem of the existing technology to architectural environment clutter recognition deficiency, the method of the present invention is on the basis of existing external illuminators-based radar signal processing, increase the preparation stage, in the preparation stage, the task of radar is not monitoring or detection target, but the building clutter echo returned from fixed environment around is collected, and establish architectural environment clutter data library；In normal work stage, radar is in monitoring or target acquisition working condition, for monitoring channel signal, first carry out primary clutter recognition processing and computing cross-correlation, then the building clutter data stored using architectural environment clutter data library, processing is offseted to building clutter remaining in the monitoring signal after cross correlation process, then carries out target detection；The signal to noise ratio that can significantly improve that treated.
Description
Technical field
The invention belongs to passive radar clutter recognition fields, in particular to a kind of to utilize urban architecture environment clutter data library
WiFi passive radar Clutter Rejection Technique.
Background technique
WiFi passive radar can be realized using the WiFi signal being readily available in city space as external sort algorithm
Detection, positioning and tracking to the interesting target being present in interior of building or its neighboring area, can be applied to security protection, field
Face monitoring, automatic Pilot, important place is cleared out a gathering place, risk object identifies, and the fields such as urgent Situation Awareness, and being that one kind is great answers
With the intelligence sensor of prospect.But complicated architectural environment will cause the reflection, scattering and diffraction of electromagnetic wave, to passive thunder
Serious environment noise jamming is brought up to system, this has become the basic reason of limitation WiFi passive radar detection performance.Mostly
Several WiFi Passive Radar Systems all includes two signal receiving channels: reference channel and monitoring channel receive respectively with reference to letter
Number and monitoring signal.It is desirable that reference signal only includes the direct-path signal from external sort algorithm, monitoring signal only includes to come from
Monitor the external sort algorithm signal of interesting target scattering in scene；However, practically, reference signal and monitoring signal further comprise
By architectural environment bring reflection multipath signal and scattering noise signal, in addition, monitoring signal may also contain very strong go directly
Interference wave signal.In the present invention, we the multi-path jamming as caused by architectural environment (including interior of building and outside), dissipate
It penetrates clutter and direct-path signal is referred to as architectural environment noise signal.Classical passive radar environment clutter suppression method mainly divides
Method and time domain is inhibited to inhibit method for two major classes: airspace.Airspace inhibits method, that is, airspace filter, it is desirable that system is matched using array antenna
It sets, realizes complex and costly；Time domain inhibits method to need to generate the Control echo signal of corresponding different distance unit delay, and counts
It calculates projection matrix and monitoring signal is projected to the subspace mutually orthogonal with clutter, but there is a problem of that operand is big, comply with one's wishes big
The extension that sharp Roma Univ. F.Colone et al. is proposed offsets algorithm (ECA, Ex-tensive Cancellation
Algorithm), segment extension offsets algorithm (ECA-B, Extensive Cancellation Algorithm Batches)
Deng.In addition, above-mentioned environment clutter suppression method does not make full use of the fixed buildings echo priori for including in environment clutter
Information, however it remains to the problem of architectural environment clutter recognition deficiency.
Summary of the invention
In order to solve the above technical problems, the present invention proposes a kind of urban architecture environment clutter recognition side of WiFi passive radar
Method makees normal work stage monitoring signal using the architectural environment clutter data of preparation stage storage in the database
Processing is offseted, the signal to noise ratio that can be improved that treated.
The technical solution adopted by the present invention are as follows: a kind of urban architecture environment clutter suppression method of WiFi passive radar, first
Architectural environment clutter data library is established in the preparation stage, wherein storing remaining architectural environment clutter data, is then existed
Normal work stage offsets processing to monitoring signal using remaining architectural environment clutter data, then carries out target detection.
In the preparation stage, the reference channel of Passive Radar System and monitoring channel only receive in monitoring scene and build ring
The fixed environment echo that border generates, and monitor and do not include moving target in environment；And in the preparation stage, including to building
The establishment process in environment clutter data library:
A1, the echo-signal for receiving monitoring scene, including receive reference signal and monitoring signal；Step A1 further includes difference
Radio frequency amplification, filtering, analog-digital conversion, down coversion, intermediate frequency and base band letter are successively carried out to reference signal and monitoring signal
Number processing；Obtain baseband reference signal and monitoring signal；Intermediate frequency or base band after analog-digital conversion can be also put into down coversion
It is carried out in signal processing.
A2, clutter recognition is carried out to reference signal；
A3, side peaks suppression is carried out to the reference signal after clutter recognition；
A4, primary clutter recognition is carried out to monitoring signal using the reference signal after side peaks suppression；
A5, by after side peaks suppression reference signal and primary clutter recognition treated that monitoring signal carries out two-dimensional cross correlation
Operation obtains the clutter residue cross-correlation matrix about architectural environment；
A6, system carry out after repeatedly receiving, and are estimated using obtained multiple clutter residue cross-correlation matrixs about building
The average clutter residue cross-correlation matrix of environment；
A7, the average clutter residue cross-correlation matrix for estimating step A6 are stored into architectural environment clutter data library.
It further, further include being updated to architectural environment clutter data library, specifically: after monitoring that environment changes,
System reenters the preparation stage, according to the treatment process of step A1~A7, updates and deposits in architectural environment clutter data library
The average remaining cross-correlation matrix of storage.
In normal work stage, to normal work stage monitoring signal make further include before the processing of architectural environment clutter cancellation with
Lower step:
B1, the echo-signal for receiving monitoring scene, including receive reference signal and monitoring signal；
B2, clutter recognition processing is carried out to reference signal；
B3, side peaks suppression processing is carried out to through clutter recognition treated reference signal；
B4, primary clutter recognition processing is carried out to monitoring signal using the reference signal after side peaks suppression；
B5, by side peaks suppression treated reference signal and primary clutter recognition, treated that monitoring signal carries out two dimension mutually
Related operation obtains two-dimensional cross correlation matrix.
Using the architectural environment clutter data stored in preparation phase data library, the monitoring of normal work stage is believed
Number processing is offseted, specifically: using the average clutter residue cross-correlation matrix stored in preparation phase data library, to step
The two-dimensional cross correlation matrix that rapid B5 is obtained carries out remaining architectural environment clutter cancellation processing, the two-dimensional cross correlation square after being offseted
Battle array.
Beneficial effects of the present invention: a kind of urban architecture environment clutter suppression method of WiFi passive radar of the invention,
On the basis of existing external illuminators-based radar signal processing, the preparation stage is increased, the remnants without echo signal are built
It builds environment clutter to be estimated, establishes architectural environment clutter data library；And as reference, in normal work stage, using depositing
The remaining architectural environment clutter data of storage in the database makees the processing of architectural environment clutter cancellation to monitoring signal, of the invention
Signal to noise ratio that method can significantly improve that treated compared with the prior art, and architectural environment echo is obviously reduced to radar detection
The influence of performance.
Detailed description of the invention
WiFi passive radar operative scenario figure when Fig. 1 is no personnel targets provided in an embodiment of the present invention；
Fig. 2 is the overall process structural block diagram of architectural environment clutter suppression method provided in an embodiment of the present invention；
Fig. 3 is the WiFi passive radar operative scenario figure provided in an embodiment of the present invention there are when personnel targets；
Fig. 4 is the direct two-dimensional cross correlation treatment effect figure provided in an embodiment of the present invention for not doing clutter recognition；
Fig. 5 is the two-dimensional cross correlation processing effect provided in an embodiment of the present invention carried out after primary clutter recognition to monitoring signal
Fruit schematic diagram；
Fig. 6 is the average clutter residue cross-correlation square stored in architectural environment clutter data provided in an embodiment of the present invention library
Battle array；
Fig. 7 is remaining architectural environment clutter cancellation provided in an embodiment of the present invention treated effect diagram.
Specific embodiment
For convenient for those skilled in the art understand that technology contents of the invention, with reference to the accompanying drawing to the content of present invention into one
Step is illustrated.
The urban architecture environment clutter suppression method of a kind of WIFI passive radar proposed by the invention, relative to traditional
Passive radar signal processing method increases an architectural environment clutter data library, returns for storing from radar ambient enviroment
Fixation architectural environment clutter data；Correspondingly, the radar course of work is divided into two stages: preparation stage and just
Normal working stage；In the preparation stage, the task of radar does not monitor or detects target instead of, collects from fixed environment around
The building clutter echo of return, and establish architectural environment clutter data library；In normal work stage, radar is in monitoring or target
Detection operations state first carries out primary clutter recognition processing and two-dimensional cross correlation using reference signal and transports for monitoring signal
It calculates, the average clutter residue cross-correlation matrix then stored using architectural environment clutter data library, after two-dimensional cross correlation processing
Monitoring signal make further remaining building clutter cancellation processing, then carry out target detection.When system context changes
Or before entering normal work stage, Passive Radar System will first establish or update its architectural environment clutter data library.
WiFi passive radar operative scenario figure when being as shown in Figure 1 without motion target, wherein radar system is with due north (N)
Direction is reference direction, and the normal of reference antenna and monitoring antenna is overlapped with direct north.Reference antenna beam position
The direction of WiFi access point (Access Point, AP), monitoring antenna beam are directed toward region to be monitored.AP work is in 2.4GHz frequency
Section, working channel are the 6th channel, and corresponding, system operating frequency 2.437GHz, signal effective bandwidth is B=16.25MHz.
E in Fig. 1 indicates due east direction.
WiFi external sort algorithm system structure and signal processing block diagram such as Fig. 2 institute using fixed environment clutter suppression method
Show.
In the present embodiment, processing that system was realized in the preparation stage the following steps are included:
A1, in the preparation stage, the fixed echo of architectural environment in reference channel and monitoring channel reception monitoring scene,
And interested moving target is free of in scene.Reference channel receives the downlink signal that work emits in the AP of the 6th channel, number
Receiver 1 carries out radio frequency amplification, filtering, analog-digital conversion, down coversion and filtering extraction to signal, and output contains N=107It is a
The digital baseband signal d of sampling pointm(n), n=1,2 ..., N, baseband sampling frequency fs=20MHz.Monitor that channel reception monitors environment
The WiFi signal of 6th channel of scattering, digital receiver 2 pairs of monitoring signals progress radio frequency amplifications, filtering, analog-digital conversion,
Down coversion and filtering extraction, output contain N=107The digital baseband signal s of a sampling pointm(n), n=1,2 ..., N, baseband sampling frequency
Rate fs=20MHz.The analog-to-digital conversion process can put intermediate frequency or base band signal process link after down conversion.
A2, to reference signal dm(n) clutter recognition is carried out, using classical reference signal clutter suppression method, such as document
“Baczyk M K,Malanowski M.Decoding and reconstruction of reference DVB-T
Signal in passive radar systems [C] //Radar Symposium.IEEE, the reference signal weight in 2010. "
Structure mode.
A3, side peaks suppression is carried out to the reference signal after clutter recognition, the frame including modulating to OFDM uses cyclic prefix
The mode of zero setting inhibits submaximum, to Direct Sequence Spread Spectrum (DSSS, Direct Sequence Spread Spectrum) modulation
Frame using Bark weight network (BWN, Binary Weight Network) plus additional side peaks suppression filter (ASRF,
Additional Sidelobes Reduction Filter) mode carry out side peaks suppression, the reference after obtaining side peaks suppression
Signal
A4, reference signal is usedTo monitoring signal sm(n) primary clutter recognition is carried out, is inhibited in monitoring scene
Multipath clutter and direct-wave jamming signal, the present embodiment choose ECA-B method, the monitoring signal that obtains that treated
A5, two-dimensional cross correlation operation is carried out, withWithThe two signals are that input carries out two-dimensional cross correlation fortune
It calculates, obtains the remaining architectural environment clutter matrix Φ of L groupm, specific calculation are as follows:
In formula, h is the serial number and h=1 of distance unit, and 2 ..., H, H=10 are the list of the measurable maximum range value of system
Member, the width Delta R=c/f of distance units=15m；K is the serial number and k=1 of doppler cells, and 2 ..., 2K, K=30 are system
The unit of measurable maximum doppler frequency value, the width of doppler cells are Δ fd=fs/ N, ()*Indicate complex conjugate operation
Symbol, exp () represent exponent arithmetic symbol, ΦmThe matrix tieed up for one 10 × 60.
A6, system receive L=150 reception, the processing of A1~A5 step are carried out to reference signal and monitoring signal, in total
Obtain L=150 clutter residue cross-correlation matrixI=1,2 ..., L estimate average clutter residue cross-correlation matrix
It indicates are as follows:
Wherein,The matrix tieed up for one 10 × 60.
A7, the remaining architectural environment clutter data for finally obtaining estimationIt is stored in the architectural environment clutter number of system
According in library.
It will be appreciated by those skilled in the art that the preparation stage signal using m as subscript be in order to it is normal
The signal of working stage distinguishes, and the subscript m is without specific physical meaning.
After the preparation stage, system enters normal work stage, and the operative scenario figure in the stage is as shown in Figure 3.
In the present embodiment, normal work stage realize process the following steps are included:
B1, reference channel receive reference signal, and monitoring channel reception monitors signal, monitor at this time miscellaneous in addition to interfering in signal
Outside wave, it is also possible to contain target scattering echo.Reference channel receives the downlink signal that work emits in the AP of the 6th channel, becomes
Reference signal, digital receiver 1 carry out radio frequency amplification, filtering, analog-digital conversion, down coversion to reference signal and extract filter
Wave, output contain N=107The digital baseband signal d (n), n=1,2 ... of a sampling point, N, baseband sampling frequency fs=20MHz.Monitoring
The WiFi signal of channel reception environment scattering, becomes environmental surveillance signal, and digital receiver 2 carries out radio frequency to environmental surveillance signal
Amplification, filtering, analog-digital conversion, down coversion and filtering extraction, output contain N=107The digital baseband signal s of a sampling point
(n), n=1,2 ..., N, baseband sampling frequency fs=20MHz.
B2, clutter recognition is carried out to reference signal d (n), using classical reference signal clutter suppression method.
B3, side peaks suppression is carried out to the reference signal after clutter recognition, the frame including modulating to OFDM uses cyclic prefix
The mode of zero setting inhibits submaximum, is added additionally to the frame of Direct Sequence Spread Spectrum (DSSS) modulation using Bark weight network (BWN)
The mode of side peaks suppression filter (ASRF) carries out side peaks suppression, the reference signal after obtaining side peaks suppression
B4, the reference signal after side peaks suppression is usedPrimary clutter recognition is carried out to monitoring signal s (n), inhibits prison
Multipath clutter and direct-wave jamming signal in visual field scape, the present embodiment choose ECA-B method, the monitoring signal that obtains that treated
B5, two-dimensional cross correlation operation is carried out, withWithThe two signals are that input carries out two-dimensional cross correlation operation,
Obtain Φw, specific calculation are as follows:
In formula, h is the serial number and h=1 of distance unit, 2 ..., H, the width Delta R=c/f of distance units=15m；K is
The serial number and k=1 of doppler cells, 2 ..., 2K, the width of doppler cells are Δ fd=fs/ N, the then measurable maximum of system
Doppler frequency is fd,max=Kfs/N.For the H=10 distance unit monitored, 2K=60 doppler cells, ΦwFor
The matrix of one 10 × 60 dimension.
B6, remaining architectural environment clutter is offseted；Using the architectural environment clutter stored in preparation phase data library
DataTo ΦwThe architectural environment clutter of middle remnants offsets processing.Offset method are as follows: in cross-correlation matrix ΦwDistance
It carries out offseting processing in dimension, whereinH=1,2 ..., H Φw1 × 2K dimension row vector, offset the expression formula of operation
Are as follows:
WhereinFor the remaining building clutter as reference on distance unit h, as architectural environment clutter data
The matrix stored in libraryH-th of row vector, βhThe amplitude weight of clutter is built for the remnants of distance unit h,For
The cross-correlation matrix Φ obtained after offsetingcH-th of row vector, weight betahCalculation be
Wherein, ()HIndicate conjugate transposition operator, ()-1Representing matrix inversion operation symbol.
So far, it completes and remaining architectural environment clutter is further suppressed, and obtained remaining architectural environment clutter suppression
Two-dimensional cross correlation matrix after systemWhereinFor the row vector of 1 × 2K dimension, and H=
10 and K=30.
B7, target echo detection is carried out；Utilize the two-dimensional cross correlation matrix Φ after remaining architectural environment clutter cancellationc, adopt
Target is detected with CFAR detection method.In ΦcDetect whether that there are target letters in each signal element of (h, k)
Number, wherein (h, k) is distance-Doppler unit index, and distance unit index is h=1 ..., H, and doppler cells index is
K=1 ..., 2K.If (hT,kT) a distance-Doppler unit cross-correlation Φc(hT,kT) value has been more than preset threshold, just sentence
Certainly unit (hT,kT) interior there are echo signal, 1≤hT≤H,1≤kT≤2K。
In conjunction with Fig. 4, Fig. 5, Fig. 6 and Fig. 7, for emulating data, AP and radar receiver are separated by 1m, target and receiver phase
It is moved away from 25m, and with the speed of speed 1.2m/s to radar receiver.AP is to send beacon frame, modulation methods periodically with 10ms
Formula is DSSS.Emulation is carried out according to above-mentioned steps, if without primary clutter recognition, obtained two-dimensional cross correlation result such as Fig. 4
It is shown, at this point, target is covered by interference such as direct wave, multipaths completely.After primary clutter recognition, two dimension as shown in Figure 5 is obtained
Correlation matrix, at this time this it appears that target position, and remaining architectural environment clutter component.Estimate that obtained remnants are built
Environment clutter is built as shown in fig. 6, the result after remaining architectural environment clutter cancellation is as shown in fig. 7, comparison diagram 5 and Fig. 7 can be seen
Out, after remaining architectural environment clutter cancellation, clutter residue component is substantially reduced, and signal to noise ratio significantly improves.
Those of ordinary skill in the art will understand that the embodiments described herein, which is to help reader, understands this hair
Bright principle, it should be understood that protection scope of the present invention is not limited to such specific embodiments and embodiments.For ability
For the technical staff in domain, the invention may be variously modified and varied.All within the spirits and principles of the present invention, made
Any modification, equivalent substitution, improvement and etc. should be included within scope of the presently claimed invention.
Claims (8)
1. a kind of urban architecture environment clutter suppression method of WiFi passive radar, which is characterized in that first in the preparation stage
Architectural environment clutter data library is established, wherein remaining architectural environment clutter data is stored, then in normal work stage benefit
Processing is offseted to monitoring signal with remaining architectural environment clutter data, then carries out target detection.
2. a kind of urban architecture environment clutter suppression method of WiFi passive radar according to claim 1, feature exist
In without moving target in preparation stage environment, reference channel only receives fixed environment echo with monitoring channel.
3. a kind of urban architecture environment clutter suppression method of WiFi passive radar according to claim 2, feature exist
In in the preparation stage, including the establishment process to architectural environment clutter data library:
A1, the echo-signal for receiving monitoring scene, including receive reference signal and monitoring signal；
A2, clutter recognition is carried out to reference signal；
A3, side peaks suppression is carried out to the reference signal after clutter recognition；
A4, primary clutter recognition is carried out to monitoring signal using the reference signal after side peaks suppression；
A5, by after side peaks suppression reference signal and primary clutter recognition treated that monitoring signal carries out two-dimensional cross correlation fortune
It calculates, obtains the clutter residue cross-correlation matrix about architectural environment；
A6, system carry out after repeatedly receiving, and are estimated using obtained multiple clutter residue cross-correlation matrixs about architectural environment
Average clutter residue cross-correlation matrix；
A7, the average clutter residue cross-correlation matrix for estimating step A6 are stored into architectural environment clutter data library.
4. a kind of urban architecture environment clutter suppression method of WiFi passive radar according to claim 3, feature exist
In, step A1 further include reference signal and monitoring signal are successively carried out respectively radio frequency amplification, filtering, analog-digital conversion, under
Frequency conversion, intermediate frequency and base band signal process；Obtain baseband reference signal and monitoring signal.
5. a kind of urban architecture environment clutter suppression method of WiFi passive radar according to claim 4, feature exist
In being carried out in the intermediate frequency or base band signal process after analog-digital conversion to be put into down coversion.
6. a kind of urban architecture environment clutter suppression method of WiFi passive radar according to claim 4 or 5, feature
It is, further includes being updated to architectural environment clutter data library, specifically: after monitoring that environment changes, system is reentered
The preparation stage updates the average remnants stored in architectural environment clutter data library according to the treatment process of step A1~A7
Cross-correlation matrix.
7. a kind of urban architecture environment clutter suppression method of WiFi passive radar according to claim 6, feature exist
In it is preceding further comprising the steps of to offset processing to normal work stage monitoring signal in normal work stage:
B1, monitoring scene echoes are received, including receives reference signal and monitoring signal；
B2, clutter recognition processing is carried out to reference signal；
B3, side peaks suppression processing is carried out to through clutter recognition treated reference signal；
B4, primary clutter recognition processing is carried out to monitoring signal using the reference signal after side peaks suppression；
B5, by side peaks suppression treated reference signal and primary clutter recognition, treated that monitoring signal carries out two-dimensional cross correlation
Operation obtains two-dimensional cross correlation matrix.
8. a kind of urban architecture environment clutter suppression method of WiFi passive radar according to claim 7, feature exist
In monitoring using the average clutter residue cross-correlation matrix stored in preparation phase data library, to normal work stage
Signal makees the processing of architectural environment clutter cancellation, specifically: using the average clutter residue stored in preparation phase data library
Cross-correlation matrix, remaining architectural environment clutter carries out offseting processing in the two-dimensional cross correlation matrix obtained to step B5, obtains
Two-dimensional cross correlation matrix after offseting.
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