CN109765554A - A kind of radar foresight imaging system and method - Google Patents
A kind of radar foresight imaging system and method Download PDFInfo
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- CN109765554A CN109765554A CN201811353987.XA CN201811353987A CN109765554A CN 109765554 A CN109765554 A CN 109765554A CN 201811353987 A CN201811353987 A CN 201811353987A CN 109765554 A CN109765554 A CN 109765554A
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Abstract
The invention discloses a kind of radar foresight imaging method system and method, the system comprises: beam scanning module, weight computing module, Wave beam forming module, matched filtering module, coherent accumulation module and quantification treatment module.The invention has the advantages that realizing simple, stepping is carried out according to certain angle by radar beam, to being scanned in range immediately ahead of radar and carrying out weight computing and Wave beam forming, matched filtering and coherent accumulation then are carried out to the wave beam of formation, quantification treatment is finally carried out and obtains image.It solves the problems, such as that the cross range resolution of conventional radar forword-looking imaging method is poor, multiple targets in beam angle can not be differentiated.It is obtained by scanning echo information, increases processing gain by pulse compression and coherent accumulation, improves resolution performance, algorithm complexity is moderate, multiple targets less than main beam width can be differentiated, the real time imagery on missile-borne platform, application value with higher are able to achieve.
Description
Technical field
The present invention relates to a kind of radar foresight imaging system and methods.
Background technique
Traditional radar foresight imaging method includes real aperture imaging and pulse imaging etc., and real aperture imaging is limited to wave
Beam width, cross range resolution are poor.And pulse imaging is simple and practical, can not differentiate to single target accurately image
Multiple targets in beam angle.
Summary of the invention
It is an object of that present invention to provide a kind of radar foresight imaging methods, and solution cross range resolution is poor, can not differentiate wave
In beam width the problem of multiple targets.
In view of this, present invention provide the technical scheme that a kind of radar foresight imaging system characterized by comprising
Beam scanning module, for obtaining snap and echo information to scanning immediately ahead of radar；
Weight computing module, for calculating adaptive weight according to the snap information of acquisition；
Wave beam forming module, for carrying out wave beam shape according to the echo information of the adaptive weight being calculated and acquisition
At；
Matched filtering module obtains matched filtering result for carrying out pulse compression according to the echo of Wave beam forming；
Coherent accumulation module, for the result of matched filtering to be carried out coherent accumulation；
Quantification treatment module obtains gray value of image for quantization after the result modulus value by coherent accumulation.
Another object of the present invention is to provide a kind of radar foresight imaging methods characterized by comprising
Beam scanning module obtains snap and echo information to scanning immediately ahead of radar；
Weight computing module calculates adaptive weight according to the snap information of acquisition；
Wave beam forming module carries out Wave beam forming according to the echo information for the adaptive weight and acquisition being calculated；
Matched filtering module carries out pulse compression according to the echo of Wave beam forming, obtains matched filtering result；
The result of matched filtering is carried out coherent accumulation by coherent accumulation module；
Quantization after the result modulus value of coherent accumulation is obtained gray value of image by quantification treatment module.
The present invention realize it is following significant the utility model has the advantages that
It realizes simple, comprising: beam scanning module, weight computing module, Wave beam forming module, matched filtering module, phase
Dry accumulation module and quantification treatment module.Stepping is carried out according to certain angle by radar beam, in range immediately ahead of radar
It is scanned and carries out weight computing and Wave beam forming, matched filtering and coherent accumulation then are carried out to the wave beam of formation, finally
It carries out quantification treatment and obtains image.The cross range resolution for solving conventional radar forword-looking imaging method is poor, can not differentiate wave beam
In width the problem of multiple targets.It is obtained by scanning echo information, increases processing gain by pulse compression and coherent accumulation,
Improve resolution performance, algorithm complexity is moderate, can differentiate multiple targets less than main beam width, be able to achieve in missile-borne platform
Upper real time imagery, application value with higher.
Detailed description of the invention
Fig. 1 is a kind of structural schematic diagram of radar foresight imaging system of the present invention；
Fig. 2 is a kind of flow chart of radar foresight imaging method of the present invention.
Appended drawing reference signal
1. 2. weight computing module of beam scanning module, 3. Wave beam forming module, 4. matched filtering module
5. 6. quantification treatment module of coherent accumulation module
Specific embodiment
The present invention is described in further detail below in conjunction with the drawings and specific embodiments, is wanted according to following explanation and right
Book is sought, advantages and features of the invention will become apparent from.It should be noted that attached drawing is all made of very simplified form and is applicable in
Non-accurate ratio, only for the purpose of facilitating and clarifying the purpose of the embodiments of the invention.
It should be noted that present invention spy is for multiple embodiments with further in order to clearly demonstrate the contents of the present invention
Illustrate different implementations of the invention, wherein multiple embodiment is enumeration and non-exhaustive.In addition, in order to illustrate
Succinctly, the content having been mentioned in preceding embodiment is often omitted in rear embodiment, therefore, unmentioned interior in rear embodiment
Appearance can accordingly refer to preceding embodiment.
Although the invention can modification in a variety of forms and replacement extend, also listed in specification some specific
Implement legend and is described in detail.It should be understood that the starting point of inventor is not that the invention is limited to illustrated spy
Determine embodiment, antithesis, the starting point of inventor is to protect in all spirit or scope given and defined by this rights statement
The improvement of progress, equivalent alterations and modifications.Same component number is likely to be used for all attached drawings to represent identical or class
As part.
Please refer to Fig. 1, a kind of radar foresight imaging system of the invention, comprising: beam scanning module 1, for radar
Front scanning obtains snap and echo information；2 pieces of weight computing mould, for calculating adaptive power according to the snap information of acquisition
Value；Wave beam forming module 3, for carrying out Wave beam forming according to the echo information of the adaptive weight being calculated and acquisition；?
Matched filtering result is obtained for carrying out pulse compression according to the echo of Wave beam forming with filter module 4；Coherent accumulation module
5, for the result of matched filtering to be carried out coherent accumulation；Quantification treatment module 6, after the result modulus value by coherent accumulation
Quantization obtains gray value of image.
In one embodiment, the quantification treatment module is also connected with target identification module.
In one embodiment, the target identification module is also connected with images match module.
As specific embodiment, radar foresight imaging system includes: beam scanning module, weight computing module, wave beam
Form module, matched filtering module, coherent accumulation module and quantification treatment module.The function of beam scanning module are as follows: according to angle
Degree interval carries out stepping, in each angle resident a period of time, and obtains corresponding snap and echo information.Weight computing module
Function are as follows: according to the snap information of acquisition calculate adaptive weight.The function of Wave beam forming module are as follows: according to what is be calculated
Weight and the echo of acquisition carry out Wave beam forming.The function of matched filtering module are as follows: pulse is carried out according to the echo of Wave beam forming
Matched filtering is realized in compression.The function of coherent accumulation module are as follows: the result of matched filtering is subjected to coherent accumulation.Quantification treatment
The function of module are as follows: quantization after the result modulus value of coherent accumulation is obtained into gray value of image.
As specific embodiment, beam scanning module, to being scanned immediately ahead of radar, is angularly spaced using wave beam
Stepping scans several angles altogether in imaging region.Each angle is resident several times pulse repetition period.The phase of radar
Control array antenna shares N number of submatrix, therefore N group signal is obtained within each time pulse repetition period, and each group of signal includes
The echo-signal of signal wave snap signal outdoors and Bo Mennei.
As specific embodiment, weight computing module is believed according to the snap information of acquisition and corresponding radar scanning angle
Breath constrains weight according to the signal estimation the smallest condition of undistorted and estimate variance, as specific embodiment, uses
Following formula:
Its meaning is so that desired signal output is maximum, and the signal of other incident directions or interference are suppressed to minimum.
As specific embodiment, Wave beam forming module is according to the radar return information of acquisition and is calculated adaptive
Weight w carries out Wave beam forming, as specific embodiment, using following formula:
Echo information i.e. in the signal wave door of the N number of submatrix of phased array antenna is multiplied and sums with corresponding weight.
As specific embodiment, matched filtering module to the Wave beam forming result in each time pulse repetition period into
Row FFT transformation, is then multiplied with the complex conjugate result of the Waveform Matching signal prestored point by point, finally carries out IFFT transformation, completes
Pulse compression, realizes matched filtering function, as specific embodiment, using following formula:
So(n)=Si(n) * H (n)=IFFT { FFT [Si(n)]FFT[H(n)]} (3)
As specific embodiment, coherent accumulation module by distance to matched filtering result by row cache, wherein
The data of each pulse repetition period save as a line, and each scanning angle is resident several pulse repetition periods, therefore obtains one
A two-dimensional matrix.Then corresponding to the element of the every a line same position of matrix to be added, therefore each scanning angle obtains one group of phase
Dry accumulation result.
As specific embodiment, quantification treatment module is stored the coherent accumulation result of each scanning angle by column, because
This obtains a two-dimensional matrix.The modulus value for taking each point in the two-dimensional matrix, then carries out quantification treatment, obtains radar imagery knot
Fruit passes to next stage and carries out the subsequent processings such as target identification, images match.So far the place of radar foresight imaging method is realized
Reason.
Referring to figure 2., a kind of radar foresight imaging method of the invention, comprising: step S101, beam scanning module is to thunder
It is scanned up to front and obtains snap and echo information；Step S102, weight computing module calculate certainly according to the snap information of acquisition
Adapt to weight；Step S103, Wave beam forming module carry out wave according to the echo information for the adaptive weight and acquisition being calculated
Beam is formed；Step S104, matched filtering module carry out pulse compression according to the echo of Wave beam forming, obtain matched filtering result；
The result of matched filtering is carried out coherent accumulation by step S105, coherent accumulation module；Step S106, quantification treatment module will be concerned with
Quantization obtains gray value of image after the result modulus value of accumulation.
In one embodiment, the beam scanning module obtains snap and echo information packet to scanning immediately ahead of radar
Include: beam scanning module, to being scanned immediately ahead of radar, is angularly spaced stepping, scans altogether in imaging region using wave beam
Several angles.Each angle is resident several times pulse repetition period.
In one embodiment, it includes: weight that weight computing module, which calculates adaptive weight according to the snap information of acquisition,
Snap information and corresponding radar scanning angle information of the computing module according to acquisition estimate undistorted and estimation side according to signal
The smallest condition of difference constrains weight.
In one embodiment, the Wave beam forming module is believed according to the echo for the adaptive weight and acquisition being calculated
It includes: that the echo information in the signal wave door of the N number of submatrix of phased array antenna is multiplied with corresponding weight that breath, which carries out Wave beam forming,
And it sums.
In one embodiment, it includes: that the matched filtering module, which carries out pulse compression according to the echo of Wave beam forming,
FFT transform is carried out to the Wave beam forming result in each time pulse repetition period with filter module, then with the waveform that prestores
The complex conjugate result of matched signal is multiplied point by point, finally carries out IFFT transformation.
In one embodiment, it includes: relevant that the result of matched filtering is carried out coherent accumulation by the coherent accumulation module
Accumulation module by distance to matched filtering result by row cache, wherein the data of each pulse repetition period save as one
Row, each scanning angle is resident several pulse repetition periods, obtains a two-dimensional matrix, then to the every a line identical bits of matrix
The element set is corresponding to be added.
In one embodiment, quantization after the result modulus value of coherent accumulation is obtained image ash by the quantification treatment module
Angle value includes: that quantification treatment module is stored the coherent accumulation result of each scanning angle by column, obtains a two-dimensional matrix, takes
The modulus value of each point, then carries out quantification treatment in the two-dimensional matrix, obtains radar imagery as a result, passing to next stage carries out mesh
The subsequent processings such as the other, images match of mark.
As specific embodiment, the method comprise the steps that the first step builds radar foresight imaging system, radar foresight
Imaging system includes: beam scanning module 1, weight computing module 2, Wave beam forming module 3, matched filtering module 4, coherent accumulation
Module 5 and quantification treatment module 6.The function of beam scanning module 1 are as follows: carry out stepping according to angle interval, stayed in each angle
A period of time is stayed, and obtains corresponding snap and echo information.The function of weight computing module 2 are as follows: believed according to the snap of acquisition
Breath calculates adaptive weight.The function of Wave beam forming module 3 are as follows: wave beam is carried out according to the echo for the weight and acquisition being calculated
It is formed.The function of matched filtering module 4 are as follows: pulse compression is carried out according to the echo of Wave beam forming, realizes matched filtering.Relevant product
The function of tired module 5 are as follows: the result of matched filtering is subjected to coherent accumulation.The function of quantification treatment module 6 are as follows: by coherent accumulation
Result modulus value after quantization obtain gray value of image.Beam scanning module 1, weight computing module 2, Wave beam forming module 3,
It is run in fpga chip with filter module 4, coherent accumulation module 5 and quantification treatment module 6.
Second step beam scanning module 1 obtains snap and echo information, 1 benefit of beam scanning module to scanning immediately ahead of radar
With wave beam to being scanned immediately ahead of radar, it is angularly spaced stepping, can usually be set as 1/10th of beam angle, is being imaged
P angle is scanned in region altogether.Each angle is resident the time of m pulse repetition period T, to imaging region complete scan one
The secondary time is t=P m T.The phased array antenna of radar shares N number of submatrix, therefore there are in each pulse repetition period T
To N group signal, each group of signal includes signal wave L point snap signal outdoors and the K point echo-signal of Bo Mennei.
Third step weight computing module 2 calculates adaptive weight according to snap information, and weight computing module 2 is according to acquisition
Snap information and corresponding radar scanning angle information, according to the signal estimation the smallest condition of undistorted and estimate variance to weight
W is constrained, as specific embodiment, using following formula:
Its meaning is so that desired signal output is maximum, and the signal of other incident directions or interference are suppressed to minimum.
The calculated result of each pulse repetition period is N number of weight, N number of submatrix of corresponding phased array antenna.
4th step Wave beam forming module 3 carries out Wave beam forming according to echo information and weight, and Wave beam forming module 3 is according to obtaining
The radar return information taken and the adaptive weight w being calculated carry out Wave beam forming, and as specific embodiment, use is following
Formula:
Echo information S i.e. in the signal wave door of the N number of submatrix of phased array antenna is multiplied and sums with corresponding weight w, obtains
To the Wave beam forming result of one group of K point.
5th step matched filtering module 4 carries out matched filtering to Wave beam forming result, and matched filtering module 4 is to each pulse
Wave beam forming result in time repetition period carries out FFT transform, then with the complex conjugate result of the Waveform Matching signal prestored
It is point-by-point to be multiplied, IFFT transformation is finally carried out, pulse compression is completed, to realize matched filtering function, obtains the matching of one group of K point
Filter result, as specific embodiment, using following formula:
So(n)=Si(n) * H (n)=IFFT { FFT [Si(n)]FFT[H(n)]} (3)
6th step coherent accumulation module 5 carries out caching and coherent accumulation to matched filtering result, and coherent accumulation module 5 will be away from
The matched filtering result of descriscent is cached by row, wherein the data of each pulse repetition period save as a line, each scan angle
It spends and is resident m pulse repetition period, therefore obtain the two-dimensional matrix of a m row.Then to the member of the every a line same position of matrix
Element is corresponding to be added, therefore each scanning angle obtains the coherent accumulation result of one group of K point.
7th step quantification treatment module 6 carries out quantification treatment to coherent accumulation result, and quantification treatment module 6 is to each scanning
The coherent accumulation result of angle obtains the two-dimensional matrix of K row P column by column storage, total P angle.Take the Two-Dimensional Moment
The modulus value of each point in battle array, then carries out 8bit quantification treatment, obtains radar imagery as a result, passing to next stage carries out target knowledge
Not, the subsequent processings such as images match.
The present invention realize it is following significant the utility model has the advantages that
It realizes simple, comprising: beam scanning module, weight computing module, Wave beam forming module, matched filtering module, phase
Dry accumulation module and quantification treatment module.Stepping is carried out according to certain angle by radar beam, in range immediately ahead of radar
It is scanned and carries out weight computing and Wave beam forming, matched filtering and coherent accumulation then are carried out to the wave beam of formation, finally
It carries out quantification treatment and obtains image.The cross range resolution for solving conventional radar forword-looking imaging method is poor, can not differentiate wave beam
In width the problem of multiple targets.It is obtained by scanning echo information, increases processing gain by pulse compression and coherent accumulation,
Improve resolution performance, algorithm complexity is moderate, can differentiate multiple targets less than main beam width, be able to achieve in missile-borne platform
Upper real time imagery, application value with higher.
Obviously, the above embodiments are merely examples for clarifying the description, rather than the restriction to embodiment.For
For person of an ordinary skill in the technical field, other various forms of variations can also be made on the basis of the above description
Or it changes.There is no necessity and possibility to exhaust all the enbodiments.And obvious variation extended from this
Or change the protection scope for still falling within the invention.
Claims (10)
1. a kind of radar foresight imaging system characterized by comprising
Beam scanning module, for obtaining snap and echo information to scanning immediately ahead of radar；
Weight computing module, for calculating adaptive weight according to the snap information of acquisition；
Wave beam forming module, for carrying out Wave beam forming according to the echo information of the adaptive weight being calculated and acquisition；
Matched filtering module obtains matched filtering result for carrying out pulse compression according to the echo of Wave beam forming；
Coherent accumulation module, for the result of matched filtering to be carried out coherent accumulation；
Quantification treatment module obtains gray value of image for quantization after the result modulus value by coherent accumulation.
2. radar foresight imaging system according to claim 1, which is characterized in that the quantification treatment module is also connected with mesh
Mark identification module.
3. radar foresight imaging system according to claim 1, which is characterized in that the target identification module is also connected with figure
As matching module.
4. a kind of radar foresight imaging method characterized by comprising
Beam scanning module obtains snap and echo information to scanning immediately ahead of radar；
Weight computing module calculates adaptive weight according to the snap information of acquisition；
Wave beam forming module carries out Wave beam forming according to the echo information for the adaptive weight and acquisition being calculated；
Matched filtering module carries out pulse compression according to the echo of Wave beam forming, obtains matched filtering result；
The result of matched filtering is carried out coherent accumulation by coherent accumulation module；
Quantization after the result modulus value of coherent accumulation is obtained gray value of image by quantification treatment module.
5. radar foresight imaging method according to claim 4, which is characterized in that the beam scanning module to radar just
Front scanning obtains snap and echo information includes: that beam scanning module is scanned radar front using wave beam, by angle
Degree interval stepping, scans several angles altogether in imaging region.Each angle is resident several times pulse repetition period.
6. radar foresight imaging method according to claim 5, which is characterized in that weight computing module is according to the fast of acquisition
Clapping information and calculating adaptive weight includes: that weight computing module is believed according to the snap information of acquisition and corresponding radar scanning angle
Breath constrains weight according to the signal estimation the smallest condition of undistorted and estimate variance.
7. radar foresight imaging method according to claim 6, which is characterized in that the Wave beam forming module is according to calculating
It includes: by the signal wave of the N number of submatrix of phased array antenna that obtained adaptive weight and the echo information of acquisition, which carry out Wave beam forming,
Echo information in door is multiplied and sums with corresponding weight.
8. radar foresight imaging method according to claim 7, which is characterized in that the matched filtering module is according to wave beam
It includes: matched filtering module to the Wave beam forming result in each time pulse repetition period that the echo of formation, which carries out pulse compression,
FFT transform is carried out, is then multiplied point by point with the complex conjugate result of the Waveform Matching signal prestored, IFFT transformation is finally carried out.
9. radar foresight imaging method according to claim 8, which is characterized in that the coherent accumulation module filters matching
The result of wave carry out coherent accumulation include: coherent accumulation module by distance to matched filtering result cached by row, wherein
The data of each pulse repetition period save as a line, and each scanning angle is resident several pulse repetition periods, obtain one two
Matrix is tieed up, it is then corresponding to the element of the every a line same position of matrix to be added.
10. radar foresight imaging method according to claim 9, which is characterized in that the quantification treatment module will be concerned with
It includes: coherent accumulation of the quantification treatment module to each scanning angle that quantization, which obtains gray value of image, after the result modulus value of accumulation
As a result by column storage, a two-dimensional matrix is obtained, the modulus value of each point in the two-dimensional matrix is taken, then carries out quantification treatment, obtain
To radar imagery as a result, passing to next stage carries out the subsequent processings such as target identification, images match.
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| CN112890855A (en) * | 2020-12-30 | 2021-06-04 | 深圳蓝韵医学影像有限公司 | Multi-beam p-order root compression coherent filtering beam synthesis method and device |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112890855A (en) * | 2020-12-30 | 2021-06-04 | 深圳蓝韵医学影像有限公司 | Multi-beam p-order root compression coherent filtering beam synthesis method and device |
| CN112890855B (en) * | 2020-12-30 | 2024-02-20 | 深圳蓝影医学科技股份有限公司 | Multi-beam p-time root compression coherent filtering beam synthesis method and device |
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