CN109407083A - The Weighted adaptive detector that a kind of pair of mismatch subspace signal flexibly controls - Google Patents

The Weighted adaptive detector that a kind of pair of mismatch subspace signal flexibly controls Download PDF

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Publication number
CN109407083A
CN109407083A CN201811559304.6A CN201811559304A CN109407083A CN 109407083 A CN109407083 A CN 109407083A CN 201811559304 A CN201811559304 A CN 201811559304A CN 109407083 A CN109407083 A CN 109407083A
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China
Prior art keywords
detector
mismatch
signal
samf
subspace
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CN201811559304.6A
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CN109407083B (en
Inventor
刘维建
段克清
王永良
陈辉
杜庆磊
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Air Force Early Warning Academy
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Air Force Early Warning Academy
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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
    • G01S13/00—Systems using the reflection or reradiation of radio waves, e.g. radar systems; Analogous systems using reflection or reradiation of waves whose nature or wavelength is irrelevant or unspecified
    • G01S13/02—Systems using reflection of radio waves, e.g. primary radar systems; Analogous systems
    • G01S13/04—Systems determining presence of a target
    • 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
    • G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
    • G01S7/02—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S13/00
    • G01S7/41—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S13/00 using analysis of echo signal for target characterisation; Target signature; Target cross-section
    • G01S7/414—Discriminating targets with respect to background clutter

Abstract

The invention discloses the Weighted adaptive detectors that a kind of pair of mismatch subspace signal flexibly controls.The invention firstly uses data to be tested and training sample to form subspace adaptive matched filter (SAMF) detector for having steady characteristic to SLM Signal Label Mismatch；It recycles data to be tested and training sample to be formed and (W-SABORT) detector is inhibited to the albefaction Orthogonal Subspaces that SLM Signal Label Mismatch has mismatch sensitivity characteristic；Then SAMF detector and W-SABORT detector configurations weight detection device are utilized；Detection threshold is finally calculated according to the statistical property of weight detection device and the false-alarm probability of systemic presupposition and carries out thresholding comparison, whether there is with adjudicating target.The detector that the present invention designs can need to adjust the size of weighting coefficient according to system, to realize robust detection or the inhibition to mismatch subspace signal；The weight detection device that the present invention designs is with having constant false alarm (CFAR) characteristic, without additional CFAR processing step；The weight detection device that the present invention designs is not necessarily to that clutter recognition function can be realized using clutter recognition as separate process step.

Description

The Weighted adaptive detector that a kind of pair of mismatch subspace signal flexibly controls
Technical field
The present invention relates to the self-adapting detectings under the SLM Signal Label Mismatch of subspace, especially suitable for multi-channel active phased array thunder It reaches.
Background technique
No matter how Radar Technology develops, target detection is one of most basic and most important function of radar always.It is phased Battle array radar antenna is made of multiple transmitting array elements and reception array element, by being with the phase controlling for receiving array element to each transmitting array element Beam scanning can be achieved, overcome the inadequate natural endowment that mechanical radar can only lean on mechanical rotation to be just able to achieve beam scanning.Phased array Radar is emitted and is received to data using numerous independent array elements, multiple airspace channel informations can be obtained, after can passing through accordingly Continuous array signal process technique significantly promotes the fighting efficiency of radar system.
For phased-array radar, the scalar and a characterization mesh of the usually available characterization target-echo intensity of target information The product representation of the column vector (i.e. steering vector) of directional information is marked, such signal can be referred to as one signal of order.And it is answered certain In, the signal guide vector of target is not accurately known, but is located in particular subspace, such as based on polarization phased array thunder There is accelerated motion or motor-driven target detection in the detection of the target detection, Helicopter Target that reach.As can be seen that subspace letter It number is the popularization of one signal of order.
It is worth noting that being usually present SLM Signal Label Mismatch in actual environment, array element error and jamming target are to lead to signal Two kinds of factors of mismatch.For the SLM Signal Label Mismatch as caused by array element error, it is generally desirable to detectors to be capable of providing steady detection Performance.And for SLM Signal Label Mismatch caused by interference signal, it would be desirable that detector can have mismatch sensitivity characteristic, i.e., not mismatch Excessive signal is measured as real echo signal.In practical applications, there is the detector of steady characteristic still to select for selection Detector with mismatch sensitivity characteristic, the problem depend on application demand.For example, radar of the work under guard model, one As wish have robust detection characteristic detector；And the radar for working in tracing mode, it would be desirable that have mismatch sensitive The detector of characteristic.However, conventional detector is fixed to the detection characteristic of mismatch signal or has steady characteristic, There is mismatch sensitivity characteristic, or be in compromise state.Therefore, conventional detector is difficult to meet flexible and changeable system need It asks.
Summary of the invention
It is an object of the invention to solve the problems, such as that there are subspace signal detections when SLM Signal Label Mismatch.
In order to realize above-mentioned goal of the invention, the present invention provides the weightings that a kind of pair of mismatch subspace signal flexibly controls Adaptive detector, including following technical step:
(1) adaptive of the subspace that there is steady characteristic to SLM Signal Label Mismatch is formed using data to be tested and training sample With filtering (SAMF) detector；
(2) the albefaction subspace that there is mismatch sensitivity characteristic to SLM Signal Label Mismatch is formed using data to be tested and training sample Orthogonal inhibition (W-SABORT) detector；
(3) SAMF detector and W-SABORT detector configurations weight detection device are utilized；
(4) detection threshold is calculated, detection threshold comparison is carried out, makes the judgement that target whether there is.
The invention has the following advantages that
(1) detector that the present invention designs can need to adjust the size of weighting coefficient according to system, to realize to mismatch The robust detection of subspace signal or inhibition；
(2) the weight detection device that the present invention designs is handled with having constant false alarm (CFAR) characteristic without additional CFAR Step；
(3) the weight detection device that the present invention designs is not necessarily to that clutter can be realized using clutter recognition as separate process step Inhibit function.
Detailed description of the invention
Fig. 1 is the structural block diagram of the embodiment of the present invention, and the SAMF detector and W-SABORT detector in figure can be It programs and realizes on general programmable signal-processing board.
Specific embodiment
In conjunction with the accompanying drawings and embodiments, present invention is further explained below.The port number for enabling phased-array radar is N, then to be checked Measured data can be indicated with the dimensional vector of N × 1 x.When there are subspace signal s, and signal is located at the son that dimension is p in data to be tested When space, subspace signal s is represented by s=A θ, and wherein N × p, which ties up sequency spectrum matrix A, indicates the basic matrix of signal subspace, p The unknown magnitude of × 1 dimensional vector θ expression signal.Therefore, data to be tested x can be written as
X=A θ+n (1)
Wherein, the dimensional vector of N × 1 n is the sum of thermal noise and clutter component.In practice, the statistical property of n is unknown, is This needs to use training sample.Assuming that first of training sample (l=1,2 ..., L) is denoted as there are L training sample
xl=nl (2)
Based on above system parameter, detailed step of the invention is as follows:
(1) SAMF detector is formed using data to be tested and training sample data
tSAMF=xHS-1A(AHS-1A)-1AHS-1x (3)
Wherein,Subscript ()HIndicate conjugate transposition, subscript ()-1Representing matrix inversion operation.
(2) W-SABORT detector is formed using data to be tested and training sample data
(3) SAMF detector and W-SABORT detector configurations weight detection device are utilized
tW=α tSAMF+(1-α)tW-SABORT (5)
Wherein, 0≤α≤1 is weighting coefficient.If intentionally getting robust detection device, need to increase the value of weight coefficient α；Instead It needs to reduce the value of weight coefficient α if intentionally getting mismatch sensitive detectors.
(4) it determines detection threshold and carries out threshold judgement, wherein detection threshold is obtained using numerical search method according to the following formula It arrives
In formula,For the false-alarm probability of systemic presupposition, ηwFor the detection threshold of weight detection device, βi=β0+ i Δ β, β0= 0, Δ β=0.01,And f0The expression formula of (β) is respectively
With
Wherein, M！Indicate the factorial of integer M.
If weight detection device tWGreater than detection threshold ηw, then determine that there are targets, otherwise determine that target is not present.
Although the embodiments of the invention are described in conjunction with the attached drawings, but those of ordinary skill in the art can be in appended power Benefit makes various deformations or amendments in the range of requiring.

Claims (5)

1. the Weighted adaptive detector that a kind of pair of mismatch subspace signal flexibly controls, including following technical step:
(1) the SAMF detector that there is steady characteristic to SLM Signal Label Mismatch is formed using data to be tested and training sample；
(2) it is formed using data to be tested and training sample and the W-SABORT that SLM Signal Label Mismatch has mismatch sensitivity characteristic is detected Device；
(3) SAMF detector and W-SABORT detector configurations weight detection device are utilized；
(4) detection threshold is calculated, detection threshold comparison is carried out, makes the judgement that target whether there is.
2. the Weighted adaptive detector that a kind of pair of mismatch subspace according to claim 1 signal flexibly controls, special Sign is that the SAMF detector in step (1) is
tSAMF=xHS-1A(AHS-1A)-1AHS-1x
Wherein, x is data to be tested,xlFor first of training sample, L is number of training, and A is that signal subspace is empty Between basic matrix, subscript ()HIndicate conjugate transposition, subscript ()-1Representing matrix inversion operation.
3. the Weighted adaptive detector that a kind of pair of mismatch subspace according to claim 1 signal flexibly controls, special Sign is that the W-SABORT detector in step (2) is
4. the Weighted adaptive detector that a kind of pair of mismatch subspace according to claim 1 signal flexibly controls, special Sign is that the weight detection device in step (3) is
tW=α tSAMF+(1-α)tW-SABORT
Wherein, 0≤α≤1 is weighting coefficient.
5. the Weighted adaptive detector that a kind of pair of mismatch subspace according to claim 1 signal flexibly controls, special Sign is that the detection threshold in step (4) is obtained using numerical search method according to the following formula
Wherein,For the false-alarm probability of systemic presupposition, ηwFor the detection threshold of weight detection device,β0=0, Δ β=0.01,And f0The expression formula of (β) is respectively
With
M！Indicate the factorial of integer M.
CN201811559304.6A 2018-12-19 2018-12-19 Weighting self-adaptive detector for flexibly controlling mismatched subspace signals Active CN109407083B (en)

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CN110244272A (en) * 2019-06-14 2019-09-17 西安电子科技大学 Wave arrival direction estimating method based on one denoising model of order
CN110988831A (en) * 2019-04-20 2020-04-10 中国人民解放军空军预警学院 Parameter adjustable detector for signal mismatch in clutter and interference coexistence environment
CN111126318A (en) * 2019-12-27 2020-05-08 中国人民解放军空军预警学院 Parameter-adjustable double-subspace signal detection method under signal mismatch
CN112558015A (en) * 2021-02-23 2021-03-26 中国人民解放军空军预警学院 Method and system for interference suppression before self-adaptive detection in complex electromagnetic environment

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CN110988831A (en) * 2019-04-20 2020-04-10 中国人民解放军空军预警学院 Parameter adjustable detector for signal mismatch in clutter and interference coexistence environment
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CN110244272B (en) * 2019-06-14 2022-12-23 西安电子科技大学 Direction-of-arrival estimation method based on rank-denoising model
CN111126318A (en) * 2019-12-27 2020-05-08 中国人民解放军空军预警学院 Parameter-adjustable double-subspace signal detection method under signal mismatch
CN112558015A (en) * 2021-02-23 2021-03-26 中国人民解放军空军预警学院 Method and system for interference suppression before self-adaptive detection in complex electromagnetic environment
CN112558015B (en) * 2021-02-23 2021-09-07 中国人民解放军空军预警学院 Method and system for interference suppression before self-adaptive detection in complex electromagnetic environment

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