CN108120976A - A kind of ground-clutter spectrum leakage suppressing method based on Doppler's channel characteristic - Google Patents
A kind of ground-clutter spectrum leakage suppressing method based on Doppler's channel characteristic Download PDFInfo
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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
- G01S13/50—Systems of measurement based on relative movement of target
- G01S13/505—Systems of measurement based on relative movement of target using Doppler effect for determining closest range to a target or corresponding time, e.g. miss-distance indicator
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Abstract
The present invention relates to a kind of ground-clutter spectrums based on Doppler's channel characteristic to reveal suppressing method, radar echo signal is picked out into the echo interference in row distance dimension first, then process of pulse-compression is carried out, finally after Doppler is tieed up to the pulse pressure data progress moving object detection after noise leveling and is divided according to Doppler's passage, range cell is compared judgement inhibition ground-clutter spectrum leakage phenomenon, elimination high reject signal in Doppler domain in addition to zero Doppler's passage one by one.The method of the present invention in the pretreatment of distance dimension and speed Wiki by, in the processing of Doppler's channel characteristic, solving the problems, such as that ground-clutter spectrum is revealed when carrying out moving object detection under the conditions of strong jamming, improves target detection probability.
Description
Technical field
The method of the present invention belongs to radar signal processing field.
Background technology
With the rapid development of modern radar countermeasure techniques, cannot meet according to traditional Radar Signal Processing flow
Become more meticulous the requirement of signal processing analysis.In radar signal processing field, high reject signal is effectively rejected, inhibits land clutter, carries
High target effective detection probability increasingly shows its importance.Land-oceanic clutters are believed from the echo of earth surface and ocean surface
Number.Document《FFT-MTD wave filter group optimization designs and emulation》(modern defense technology, 2011, Vol.39, No.2pp:10-14)
In propose using " multiple bandpass filter groups to radar return carry out pulse Doppler processing, then again to wave filter group
Output is detected to find target ".Document《MTD anti-jamming ability of radar is analyzed》(firepower is controlled with commander, and 2004,
Vol.29,No.1pp:The utilization cascade system of general wave filter " utilized more anti-interference " is proposed in 71-73).These are all profits
(MTD) method is detected with traditional moving-target, effectively can unambiguously detect the moving-target in Doppler's channel range
Signal, but it is limited for the rejection ability of ground-clutter spectrum leakage.
Traditional moving-target detection (MTD) can not effectively inhibit land clutter leakage and the instantaneous strong jamming problem of receiver, move mesh
During mark detection (MTD) processing, since Doppler filter is limited to the ground bounce removal ability of certain spectrum width, and for receiving
The instantaneous strong jamming of machine, meeting false judgment is echo signal, influences rear end and carries out target detection, reduces target detection probability.
For strong jamming echo-signal, become after pulse pressure by the modulated decoy signal of pulse compression coefficient, be unfavorable for carrying out more
The general ground-clutter spectrum leakage processing for strangling channel characteristic division and follow-up data processing.For land clutter, since ground-clutter spectrum has
Certain broadening causes non-zero-speed wave filter to have certain output, causes substantial amounts of clutter remaining, influences normal target inspection
It surveys, therefore the present invention proposes the ground-clutter spectrum leakage suppressing method based on Doppler's channel characteristic, using strong jamming rejecting side
Method and the ground-clutter spectrum leakage suppressing method rejecting high reject signal based on Doppler's channel characteristic and remaining land clutter.
The content of the invention
The present invention is proposed a kind of based on Doppler's channel characteristic for traditional mechanic scan radar or modern phased array radar
Ground-clutter spectrum reveals suppressing method, realizes and high reject signal is rejected, and effectively inhibits ground-clutter spectrum leakage, it is general to improve target detection
Rate tackles strong jamming and land clutter, using embedded inside FPGA jointly tieing up bidimensional apart from peacekeeping Doppler
Microblaze calculates the statistics modulus value data of original echoed signals in real time, then according to setting threshold value statistical distance unit
Corresponding with each range cell modulus value data of number, judge its whether be normal echo-signal endian data, if not
The modulus value data then counted according to respective distances unit are judged as high reject signal or abnormal numerical value, and replace accordingly
For the multiple noise echo after normal leveling.The operation principle of Doppler's passage division is defeated according to zero-speed passage, non-zero-speed passage
Go out degree of convergence size and filter joint Frequency Response, reach the inhibition to ground-clutter spectrum leakage.Doppler's passage division methods are
To the output of all Doppler's passages in addition to No. zero Doppler filter, range cell is handled one by one.
The specific content of the invention of the invention is as follows：When radar works, width can be all introduced in itself for enemy's interference and receiver
Very strong on degree, bandwidth occupies very wide high reject signal, and pulse compression and moving target are carried out for follow-up Radar Signal Processing
Detection can all have an impact, and the present invention, as thresholding is judged, then returns first to background noise environment sampled data to what is received
In distance dimension, range cell is utilized respectively distance across information and the processing of amplitude modulus value information consolidation to ripple signal one by one, judges whether
It is normal echo-signal or high reject signal either exceptional value, is then carried out being replaced into noise time according to amplitude modulus value information
Ripple signal retains original echoed signals processing.For the data after pulse pressure, according to the Doppler's channel number and need of setting
The land clutter spectrum width to be inhibited is carried out in addition to zero Doppler's passage, each Doppler's passage amplitude-frequency response gain normalization,
The modulus value after the normalization of Doppler's path computation makees poor, last and current noise mould with land clutter in the modulus value of this passage one by one again
Value compares, and chooses larger conduct final output.
Specific inventive step of the invention is as follows：If the radar return data of acquisition are respectively the orthogonal two-way of I, Q, coordinate is used
Rotary digital computational methods IP kernel carries out modulus to it and draws modulus value data, then according to the size of modulus value and statistics thresholding mould
Value is compared, if this modulus value is less than statistics thresholding, is judged as that normal echo-signal carries out process of pulse-compression, is otherwise turned
Enter and handle in next step；The modulus value of two range cell adjacent to after above-mentioned modulus value amplitude weighting and left and right compares respectively
Compared with judgement, if the modulus value after weighting is all higher than the modulus value of two adjacent range cells of left and right, then judge current detection list
Member is exceptional value and is replaced into multiple noise, carries out process of pulse-compression, otherwise sliding window statistics predetermined number it is adjacent away from
From the number for being more than some setting thresholding in unit number, then judge this number if greater than the thresholding set after video and
Less than the thresholding of another setting, then be judged as the tail signal of normal echo impulse either pulse, retain original I, Q
Process of pulse-compression is carried out, video-processed multiple noise is otherwise set to, carries out process of pulse-compression；Assuming that Doppler's port number
For R, original echo is defeated by corresponding Doppler filter group on some Doppler's passage wherein a range cell
The modulus value gone out after being maximized is denoted as Pk, wherein k=1,2,3 ﹍ R, and original echo is denoted as by some Doppler's channel gain
Gk, wherein k=1,2,3 ﹍ R are that the processing gain unit after normalization is dB herein, and wherein IFk represents Doppler filter k,
Wherein k=1,2,3 ﹍ R, improvement factor of the processing output in some range cell；To the radar video after process of pulse-compression
After signal ties up progress zero distance alignment according to distance successively according to pulse repetition period number, conventional Doppler filter is carried out
Group matched filtering, the modulus value data after every group of Doppler filter modulus are then obtained respectively, then according to except zero it is how general
It strangles outside filter channel, other Doppler filters calculate P_L=Pk- (P0*Gk- according to following normalized gain formula successively
IFk*G0)；Compare the size of the multiple noise modulus value after P_L=Pk- (P0*Gk-IFk*G0) and video, choose larger modulus value data
Current modulus value is updated and as the modulus value data finally exported, to achieve the purpose that inhibit ground-clutter spectrum.
The present invention is 1. to make full use of Microblaze inside FPGA soft compared to conventional radar signal processing technology advantage
The characteristics of core computing capability is strong, meets requirement of real-time.2. with multi-beam expandability and real-time calculating processing ability, fortune
Calculation amount is small.3. effectively rejecting the strong jamming of enemy's release or the high reject signal of this receiver introduction, consumption hardware resource is few,
Bulk delay range cell is limited.4. can effectively inhibit the leakage problem of ground-clutter spectrum, detection probability is improved.
Description of the drawings
Fig. 1, which is that the present invention is based on the ground-clutter spectrums of Doppler's channel characteristic, to reveal suppressing method process flow schematic diagram.
Fig. 2 is that the measured data used in the specific embodiment of the invention carries strongly disturbing radar return modulus value.
Fig. 3 is that the measured data used in the specific embodiment of the invention carries strongly disturbing radar return pulse pressure modulus value.
Fig. 4 is the radar return modulus value after the measured data strong jamming used in the specific embodiment of the invention is rejected.
Fig. 5 is the radar return pulse pressure modulus value after the measured data strong jamming used in the specific embodiment of the invention is rejected.
Fig. 6, which is that the present invention is based on the leakages of the ground-clutter spectrum of Doppler's channel characteristic, to inhibit schematic diagram.
Fig. 7 is that the leakage of the ground-clutter spectrum based on Doppler's channel characteristic that the specific embodiment of the invention uses inhibits output effect
Fruit.
Specific embodiment
Ground-clutter spectrum the present invention is based on Doppler's channel characteristic reveals suppressing method flow diagram as shown in Figure 1, vacation
If modulus value of original radar IF echo data I, Q after CORDIC modulus computings of acquisition is A1, according to background environment and
The thresholding that receiver noise determines is M1 and M2, and the current modulus value for differentiating range cell or so two range cells is X1, X2, arteries and veins
Sampling before punching press contracting answers noise average as I1, Q1, is denoted as R slow time dimension pulse repetition periods：T1、T2、T3…TR.
Assuming that Doppler's port number is R, original echo is by corresponding on some Doppler's passage wherein a range cell
Modulus value after the output of Doppler filter group is maximized is denoted as Pk (k=1,2,3...R), and how general original echo is by some
Strangle channel gain be denoted as Gk (here be normalization after processing gain unit be：DB), wherein IFk represents Doppler filter k
(k=1,2,3...R) improvement factor of the processing output in some range cell.
With reference to flow chart and example, the embodiment of the method for the present invention is specifically addressed, process is as follows：
Step 1：Strong jamming is rejected.
1. the present invention combines pulse width and ambient noise as basis for estimation, first to the radar return data of acquisition into
Row I, Q two-way CORDIC modulus is denoted as A1, is then compared according to the size of modulus value A1 and statistics thresholding modulus value M1, if A1
Less than statistics thresholding M1, then it is judged as that normal echo-signal carries out process of pulse-compression, is otherwise transferred to and handles in next step.
2. after couple modulus value A1 weighting K1 and the modulus value X1 and X2 of two range cells that left and right is adjacent are compared judgement,
If the modulus value after weighting is all higher than X1 and X2, then current detection unit is judged for exceptional value and is replaced into noise I1, Q1,
Carry out process of pulse-compression.Otherwise be more than the number P of M2 in sliding window statistics neighbor distance unit number N, then judge P if greater than
Thresholding M2 and the tail signal for being so judged as the either pulse of normal echo impulse less than thresholding M3, retain original I, Q is carried out
Process of pulse-compression.Otherwise, process of pulse-compression is carried out after being set to noise I1, Q1.
It is the Comparative result after strong jamming is rejected before and after pulse pressure as shown in Figure 2.
Step 2：Doppler's passage divides ground bounce removal.
1. the vision signal after pair process of pulse-compression is according to T1, T2, T3 ... TR carries out R after carrying out the alignment in R cycle
After the conventional Doppler filter group matched filtering of group, to being denoted as P1, P2, P3 after R groups wave filter respectively modulus ..., then PR is pressed
According to schematic diagram shown in Fig. 3 in addition to zero Doppler's passage, other Doppler filters calculate P_L=Pk- (P0*Gk- successively
IFk*G0)。
2. compare the size of P_L=Pk- (P0*Gk-IFk*G0) and noise modulus value A2, before choosing larger modulus value update
Pk is simultaneously denoted as Pk'.
It is by based on the Comparative result before and after Doppler's channel characteristic progress ground bounce removal as shown in Figure 4.
From specific embodiment as can be seen that reveal inhibition side using the present invention is based on the ground-clutter spectrums of Doppler's channel characteristic
Method can effectively reject high reject signal, inhibit the land clutter of certain clutter spectrum width, and by combining distance dimension, Doppler ties up bidimensional
Processing can be effectively improved MTD improvement factors and subsequent detection probability simultaneously.
Claims (1)
1. a kind of ground-clutter spectrum leakage suppressing method based on Doppler's channel characteristic, it is characterised in that：Assuming that the radar of acquisition
Echo data is respectively the orthogonal two-way of I, Q, carries out modulus to it using Coordinate Rotation Digital computational methods IP kernel and draws modulus value
Then data are compared according to the size of modulus value and statistics thresholding modulus value, if this modulus value is less than statistics thresholding, be judged as
Normal echo-signal carries out process of pulse-compression, is otherwise transferred to and handles in next step；To after above-mentioned modulus value amplitude weighting and left
The modulus value of right two adjacent range cells is compared judgement respectively, if the modulus value after weighting is all higher than adjacent two in left and right
The modulus value of a range cell, then judge current detection unit for exceptional value and be replaced into multiple noise, carry out at pulse compression
Otherwise reason is more than the number of some setting thresholding, then sentences in the neighbor distance unit number of sliding window statistics predetermined number
This number of breaking is if greater than the thresholding set after video and less than the thresholding of another setting, then is judged as normal echo
The tail signal of pulse either pulse, retains original I, Q carries out process of pulse-compression, is otherwise set to and video-processed makes an uproar again
Sound carries out process of pulse-compression；Assuming that Doppler's port number is R, original echo passes through some Doppler's passage wherein
Modulus value after the output of corresponding Doppler filter group is maximized in one range cell is denoted as Pk, wherein k=1,2,3 ﹍ R,
Original echo is denoted as Gk, wherein k=1 by some Doppler's channel gain, and 2,3 ﹍ R are that the processing after normalization increases herein
Beneficial unit is dB, and wherein IFk represents Doppler filter k, wherein k=1, and 2,3 ﹍ R, processing output is in some range cell
Improvement factor；To the radar video signal after process of pulse-compression according to pulse repetition period number successively according to distance tie up into
After the alignment of row zero distance, conventional Doppler filter group matched filtering is carried out, every group of Doppler filter is then obtained respectively
Modulus value data after modulus, then according in addition to zero Doppler filter passage, other Doppler filters successively according to
Following normalized gain formula calculates P_L=Pk- (P0*Gk-IFk*G0)；Compare P_L=Pk- (P0*Gk-IFk*G0) and video
The size of multiple noise modulus value afterwards chooses the current modulus value of larger modulus value data update and as the modulus value number finally exported
According to achieve the purpose that inhibit ground-clutter spectrum.
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| CN110703239A (en) * | 2019-09-23 | 2020-01-17 | 上海广电通信技术有限公司 | Coherent marine radar target enhancement technology based on Doppler processing |
| CN110865363A (en) * | 2019-11-01 | 2020-03-06 | 武汉滨湖电子有限责任公司 | Moving target display and detection synthesis method |
| CN111796288A (en) * | 2020-06-12 | 2020-10-20 | 中国船舶重工集团公司第七二四研究所 | Clutter frequency spectrum compensation technology-based three-coordinate radar moving target processing method |
| CN112014806A (en) * | 2020-08-14 | 2020-12-01 | 西安电子科技大学 | Method for suppressing unintentional interference of airborne radar in complex interference scene |
| CN112162256A (en) * | 2020-09-29 | 2021-01-01 | 中国船舶重工集团公司第七二四研究所 | Pulse correlation-based cascade multi-dimensional radial motion characteristic detection method |
| CN112673277A (en) * | 2018-11-07 | 2021-04-16 | 三星电子株式会社 | Motion assisted leak removal for radar applications |
| CN112904326A (en) * | 2021-01-29 | 2021-06-04 | 哈尔滨工业大学 | Satellite-borne passive positioning method based on virtual aperture |
| CN114624514A (en) * | 2020-12-09 | 2022-06-14 | 北京华航无线电测量研究所 | Wave height measuring method based on orthogonal phase detection |
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| CN112673277A (en) * | 2018-11-07 | 2021-04-16 | 三星电子株式会社 | Motion assisted leak removal for radar applications |
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| CN111796288A (en) * | 2020-06-12 | 2020-10-20 | 中国船舶重工集团公司第七二四研究所 | Clutter frequency spectrum compensation technology-based three-coordinate radar moving target processing method |
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| CN112162256A (en) * | 2020-09-29 | 2021-01-01 | 中国船舶重工集团公司第七二四研究所 | Pulse correlation-based cascade multi-dimensional radial motion characteristic detection method |
| CN112162256B (en) * | 2020-09-29 | 2023-08-01 | 中国船舶集团有限公司第七二四研究所 | Cascaded multi-dimensional radial motion feature detection method based on pulse correlation |
| CN114624514A (en) * | 2020-12-09 | 2022-06-14 | 北京华航无线电测量研究所 | Wave height measuring method based on orthogonal phase detection |
| CN112904326A (en) * | 2021-01-29 | 2021-06-04 | 哈尔滨工业大学 | Satellite-borne passive positioning method based on virtual aperture |
| CN112904326B (en) * | 2021-01-29 | 2024-01-02 | 哈尔滨工业大学 | Satellite-borne passive positioning method based on virtual aperture |
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