CN104007437A - SAR real-time imaging processing method based on FPGA and multiple DSPs - Google Patents
SAR real-time imaging processing method based on FPGA and multiple DSPs Download PDFInfo
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- CN104007437A CN104007437A CN201410216266.XA CN201410216266A CN104007437A CN 104007437 A CN104007437 A CN 104007437A CN 201410216266 A CN201410216266 A CN 201410216266A CN 104007437 A CN104007437 A CN 104007437A
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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
- G01S13/88—Radar or analogous systems specially adapted for specific applications
- G01S13/89—Radar or analogous systems specially adapted for specific applications for mapping or imaging
- G01S13/90—Radar or analogous systems specially adapted for specific applications for mapping or imaging using synthetic aperture techniques, e.g. synthetic aperture radar [SAR] techniques
- G01S13/9004—SAR image acquisition techniques
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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
- G01S13/88—Radar or analogous systems specially adapted for specific applications
- G01S13/89—Radar or analogous systems specially adapted for specific applications for mapping or imaging
- G01S13/90—Radar or analogous systems specially adapted for specific applications for mapping or imaging using synthetic aperture techniques, e.g. synthetic aperture radar [SAR] techniques
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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
- 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
- G01S7/28—Details of pulse systems
- G01S7/285—Receivers
- G01S7/32—Shaping echo pulse signals; Deriving non-pulse signals from echo pulse signals
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Abstract
The invention belongs to the technical field of radar real-time imaging processing, and particularly relates to an SAR real-time imaging processing method based on an FPGA and multiple DSPs. The processing method includes the following steps that echo data are pre-processed by means of an FPGA chip, so that subaperture data are obtained; the subaperture data are sent to the first DSP sequentially by means of the FPGA chip and are alternately forwarded to the third DSP, the fourth DSP and the seventh DSP by means of the FPGA chip for Doppler center estimation, range migration correction, Doppler rate estimation and motion parameter estimation, and the processed data are forwarded to the eighth DSP sequentially through the first DSP; each subaperture datum is divided into three blocks in the range direction through the eighth DSP and the three blocks of each subaperture datum are sent to the second DSP, the fifth DSP and the sixth DSP respectively for motion parameter fitting, phase compensation, direction pulse pressure and multiview processing, so that corresponding blocked image data are obtained; the blocked image data are transmitted to the eighth DSP for image quantization and image splicing processing, and ultimately an SAP image is obtained.
Description
Technical field
The invention belongs to radar real time imagery processing technology field, particularly the SAR real-time imaging processing method based on FPGA and many DSP.
Background technology
Synthetic-aperture radar (Synthetic Aperture Radar, SAR) has the features such as round-the-clock, round-the-clock, remote and high-resolution imaging.A critical function of synthetic-aperture radar is imaging, and this has been widely used in military and civilian field.Along with the development of Digital Signal Processing and synthetic aperture radar image-forming algorithm, Technologies Against Synthetic Aperture Radar echoed signal is processed in real time, and realizes high-resolution real time imagery and become the new focus of research.
DSP, as special microprocessor, is mainly used in calculating, and advantage is the dirigibility of software, is applicable to condition process, particularly complicated many algorithms task, and DSP programmes by compilation or higher level lanquage (as C language), real-time implementation scheme.Therefore, adopt the advantage of DSP device to be: software upgrading speed is fast, has improved greatly reliability, versatility, updatability and the dirigibility of system.
The features such as FPGA has highly-parallel, stream treatment, resource utilization is high, dirigibility is strong, development structure is relatively simple, and power consumption is also lower, is more and more applied to separately in SAR imaging system.
Traditional SAR real time imagery is processed and is adopted multi-DSP parallel technology, often has the shortcomings such as between DSP resource unreasonable distribution, DSP, degree of parallelism is not high, the processing time is long.Along with the renewal of technology, traditional method is not optimized, will be difficult to reach the requirement of real-time processing.
Summary of the invention
The object of the invention is to propose the SAR real-time imaging processing method based on FPGA and many DSP.The present invention has not only reached the requirement of real time imagery processing, but also has higher degree of accuracy.
For realizing above-mentioned technical purpose, the present invention adopts following technical scheme to be achieved.
SAR real-time imaging processing method based on FPGA and many DSP comprises the following steps:
S1: utilize airborne synthetic aperture radar to receive echo data, described echo data is sent in fpga chip, described echo data is carried out to distance successively to process of pulse-compression, Digital Down Convert processing, to, through Digital Down Convert data after treatment along orientation to carrying out piecemeal, obtain multiple sub-apertures data; Fpga chip is sent to every sub-aperture number certificate in the first dsp chip in order;
S2: the first dsp chip is by the order that receives sub-aperture data, each sub-aperture number certificate is alternately sent to the 3rd dsp chip, the 4th dsp chip and the 7th dsp chip, the 3rd dsp chip, the 4th dsp chip or the 7th dsp chip, according to the sub-aperture data that receive, carry out the estimation of Doppler center, range migration correction, doppler frequency rate estimation, kinematic parameter estimation; Draw the corresponding rear data of sub-aperture processing, after then the sub-aperture of correspondence being processed, data are sent to the first dsp chip;
S3: the first dsp chip is by the order that receives the rear data of sub-aperture processing, and after sub-aperture is processed, data are sent to the 8th dsp chip successively; The 8th dsp chip often receives a sub-aperture and processes rear data, after just this sub-aperture being processed, data are carried out distance to piecemeal processing, obtain three corresponding distances to block data, the 8th dsp chip is sent to respectively the second dsp chip, the 5th dsp chip, the 6th dsp chip by corresponding distance to three block datas; The second dsp chip, the 5th dsp chip or the 6th dsp chip are receiving all distances corresponding to a width SAR view data after block data, carry out kinematic parameter matching, phase compensation, orientation to process of pulse-compression, look processing more, obtain corresponding multiple block image data; The block image data of described correspondence are sent to the 8th dsp chip by the second dsp chip, the 5th dsp chip or the 6th dsp chip;
S4: the 8th dsp chip carries out entire image quantification, Image Mosaics processing to described block image data in real time, finally obtains a width SAR image.
Feature of the present invention and further improvement are:
In step S2, sub-aperture data processing chip carries out the estimation of Doppler center according to the sub-aperture data that receive, and draws the Doppler center that sub-aperture data are corresponding; Sub-aperture data processing chip carries out range migration correction, doppler frequency rate estimation according to the sub-aperture data that receive, and obtains doppler frequency rate corresponding to sub-aperture data; Sub-aperture data processing chip, according to doppler frequency rate corresponding to sub-aperture data, draws speed and the acceleration of carrier aircraft; Described sub-aperture data processing chip is the 3rd dsp chip, the 4th dsp chip or the 7th dsp chip;
In step S2, described sub-aperture is processed rear data and is comprised Doppler center corresponding to sub-aperture data, corresponding doppler frequency rate, the speed of carrier aircraft and the acceleration of carrier aircraft of sub-aperture data.
In step S3, distance receiving all distances corresponding to a width SAR view data after block data, is carried out kinematic parameter matching to block data process chip, draws multiple data through kinematic parameter matching;
Then respectively multiple data through kinematic parameter matching are carried out to phase compensation, draw data after corresponding multiple phase compensations; Data after multiple phase compensation are carried out respectively to orientation to process of pulse-compression, draw data after corresponding multiple orientation pulse pressure; Data after multiple orientation pulse pressure are carried out looking respectively processing more, draw corresponding multiple block image data.
In step S3, drawing data after corresponding multiple phase compensations, the mode that adopts matched filtering to multiple phase compensation after data carry out respectively orientation to process of pulse-compression.
Beneficial effect of the present invention is: the first, and the present invention, using fpga chip and dsp chip as core processor, gives full play to fpga chip and dsp chip processing power advantage, has not only reached the requirement of real-time processing, but also has had higher degree of accuracy.
Second, the present invention makes full use of the resource of 8 DSP, the Processing tasks of every DSP of reasonable distribution, allow data transmission period and imaging algorithm time parallel, realized cardinal principle between multi-DSP synchronous simultaneously, greatly saved the time of whole algorithm process, meet completely real time imagery process to time requirement, and data image has reached all standard of real time imagery.
Brief description of the drawings
Fig. 1 is the structural representation of the SAR real time imagery treating apparatus based on FPGA and many DSP;
Fig. 2 is the process flow diagram of the SAR real-time imaging processing method based on FPGA and many DSP of the present invention;
Fig. 3 is the SAR imaging results figure of measured data.
Embodiment
Below in conjunction with accompanying drawing, the invention will be further described:
The present invention proposes a kind of SAR real time imagery treating apparatus based on FPGA and many DSP.With reference to Fig. 1, it is the structural representation of the SAR real time imagery treating apparatus based on FPGA and many DSP.Should comprise fpga chip, host computer, the first dsp chip to the eight dsp chips by the SAR real time imagery treating apparatus based on FPGA and many DSP; The output terminal of fpga chip is electrically connected the input end (message transmission rate between fpga chip and the first dsp chip is 300MB/s) of the first dsp chip; The first dsp chip is electrically connected respectively the 3rd dsp chip, the 4th dsp chip and the 7th dsp chip; The input end of output terminal electrical connection the 8th dsp chip of the first dsp chip, the 8th dsp chip is electrically connected respectively the second dsp chip, the 5th dsp chip and the 6th dsp chip, the input end of the output terminal electrical connection host computer of the 8th dsp chip.
With reference to Fig. 2, it is the process flow diagram of the SAR real-time imaging processing method based on FPGA and many DSP of the present invention.SAR real-time imaging processing method based on FPGA and many DSP of the present invention, based on the above-mentioned SAR real time imagery treating apparatus based on FPGA and many DSP, comprises the following steps:
S1: utilize airborne synthetic aperture radar to receive echo data, above-mentioned echo data is sent in fpga chip, above-mentioned echo data is carried out to distance successively to be processed to process of pulse-compression, Digital Down Convert (DDC), to, through Digital Down Convert data after treatment along orientation to carrying out piecemeal, obtain multiple sub-apertures data; Fpga chip is sent to every sub-aperture number certificate in the first dsp chip in order.Be described as follows:
Particularly, fpga chip often receives the data of a pulse, just starts to carry out corresponding distance to process of pulse-compression and Digital Down Convert processing.
S2: the first dsp chip is by the order that receives sub-aperture data, each sub-aperture number certificate is alternately sent to the 3rd dsp chip, the 4th dsp chip and the 7th dsp chip, the 3rd dsp chip, the 4th dsp chip or the 7th dsp chip, according to the sub-aperture data that receive, carry out the estimation of Doppler center, range migration correction, doppler frequency rate estimation, kinematic parameter estimation; Draw the corresponding rear data of sub-aperture processing, after then the sub-aperture of correspondence being processed, data are sent to the first dsp chip.Be described as follows:
In step S2, the process that the first dsp chip alternately sends each sub-aperture number certificate is: the N receiving sub-aperture data are sent to the 3rd dsp chip by the first dsp chip, the N+1 receiving sub-aperture data are sent to the 4th dsp chip, the N+2 receiving sub-aperture data are sent to the 7th dsp chip, and N is the multiple that integer and N are 3.In the embodiment of the present invention, the size of every sub-aperture number certificate is 16MB.
In step S2, sub-aperture data processing chip carries out the estimation of Doppler center according to the sub-aperture data that receive, and draws the Doppler center that sub-aperture data are corresponding.The following describes the principle that Doppler center is estimated: if while thering is no Doppler's off-centring, receive sub-aperture data in orientation to power spectrum be expressed as S (f), it is identical with antenna radiation pattern, and with zero-frequency symmetry, the related function R (τ) that power spectrum is corresponding is real function, wherein, f is orientation frequency, and τ is orientation time delay.If while there is Doppler shift, power spectrum is expressed as S (f-f
dc), f
dcfor Doppler center corresponding to sub-aperture data to be asked.Now the related function of power spectrum is expressed as
so, in the time carrying out the estimation of Doppler center, can estimate f from the phase angle of the related function of power spectrum
dc.
In step S2, sub-aperture data processing chip carries out range migration correction, doppler frequency rate estimation according to the sub-aperture data that receive, and obtains doppler frequency rate corresponding to sub-aperture data.Particularly, SAR echo data has orientation translation invariance, conventionally completes the correction of range migration at orientation Doppler domain, in positive side-looking situation, is mainly the bending correction of adjusting the distance.
At orientation Doppler domain, range migration amount can be expressed as:
Wherein, R
bfor the minimum distance of the target range carrier aircraft line of flight, f
afor range Doppler frequency, the angle of squint that θ is target, f
aMrepresent to be positioned at the maximum Azimuth Doppler Frequency of echo of carrier aircraft dead ahead point target.
For the correction of range migration, be conventionally multiplied by Δ R (f apart from frequency domain, orientation Doppler domain
a, R
b) corresponding linear phase completes, and is multiplied by following function expression
Wherein, R
bfor the minimum distance of the target range carrier aircraft line of flight, c is the light velocity, f
γfor Azimuth Doppler Frequency, f
afor range Doppler frequency.
In the embodiment of the present invention, in the time carrying out doppler frequency rate estimation, the method using is image shift algorithm (being called for short MD algorithm), and 32 plural numbers (point) larger by mould value in the data of antithetical phrase aperture carry out image shift processing, obtain 8 corresponding doppler frequency rates.
Sub-aperture data processing chip, according to doppler frequency rate corresponding to sub-aperture data, draws speed and the acceleration of carrier aircraft; Above-mentioned sub-aperture data processing chip is the 3rd dsp chip, the 4th dsp chip or the 7th dsp chip; In step S2, above-mentioned sub-aperture is processed rear data and is comprised Doppler center corresponding to sub-aperture data, corresponding doppler frequency rate, the speed of carrier aircraft and the acceleration of carrier aircraft of sub-aperture data.
Specifically, the non-stationary athletic meeting of carrier aircraft is reflected in the reception of echo data, thereby be embodied in the Doppler parameter estimation of echo data, it is mainly doppler frequency rate, thereby can be by the anti-non-stationary kinematic parameter that pushes away carrier aircraft of doppler frequency rate, the non-stationary kinematic parameter of carrier aircraft comprises the acceleration of speed and the carrier aircraft of carrier aircraft.
In step S2, three dsp chips (the 3rd dsp chip, the 4th dsp chip and the 7th dsp chip) synchronously carry out the estimation of Doppler center, range migration correction, doppler frequency rate estimation, kinematic parameter estimation, have greatly shortened operation time.
S3: the first dsp chip is by the order that receives the rear data of sub-aperture processing, and after sub-aperture is processed, data are sent to the 8th dsp chip successively; The 8th dsp chip often receives a sub-aperture and processes rear data, after just this sub-aperture being processed, data are carried out distance to piecemeal processing, for example obtain three corresponding distances, to block data (three distances correspond to 5472KB, 5456KB, 5456KB to the size of block data), the 8th dsp chip is sent to respectively the second dsp chip, the 5th dsp chip, the 6th dsp chip by corresponding distance to three block datas; The second dsp chip, the 5th dsp chip or the 6th dsp chip are receiving all distances corresponding to a width SAR view data after block data, carry out kinematic parameter matching, phase compensation, orientation to process of pulse-compression, look processing more, obtain corresponding multiple block image data; The block image data of above-mentioned correspondence are sent to the 8th dsp chip by the second dsp chip, the 5th dsp chip or the 6th dsp chip.Be described as follows:
In the second dsp chip, the 5th dsp chip and the 6th dsp chip, the mode that data are processed is identical, is illustrated below as an example of the second dsp chip example.In the embodiment of the present invention, when the second dsp chip receives the 1st distance to 16 distances of block data to the to block data after (the 1st distance to 16 distances of block data to the to block data is: all distances corresponding to the first width SAR view data are to block data), carry out kinematic parameter matching, phase compensation, orientation to process of pulse-compression, look processing more.When the second dsp chip receives the 27th distance, to block data, (the 12nd distance to 27 distances of block data to the to block data is: all distances corresponding to the second width SAR view data are to block data, the first width SAR view data and the second width SAR view data exist the distance of 5 corresponding repetitions to block data, the distance of these 5 repetitions is that the 12nd distance is to 16 distances of block data to the to block data to block data) afterwards, carry out kinematic parameter matching, phase compensation, orientation to process of pulse-compression, look processing more.
Below respectively account for motion parameter fitting, phase compensation, orientation to process of pulse-compression, the process of looking processing more:
Kinematic parameter matching: kinematic parameter matching method used is cubic spline interpolation method, after carrying out kinematic parameter matching, draw multiple data through kinematic parameter matching (functional relation in the functional relation in carrier aircraft speed and orientation and carrier aircraft acceleration and orientation), at this moment, also just draw whole orientation (being for example to count in 8192 orientation) corresponding carrier aircraft acceleration and the carrier aircraft speed of counting
Phase compensation: after the matching of kinematic parameter, carrier aircraft acceleration and carrier aircraft speed are made to integration and just can obtain the position skew r of radar in normal plane
r(t
m) situation of change, now just can be compensated accordingly t to the phase place of the data through kinematic parameter matching
mrepresent the corresponding moment.In the time carrying out phase compensation, phase compensating factor
for:
wherein, λ is the wavelength that airborne synthetic aperture radar outwards transmits.After respectively multiple data through kinematic parameter matching being carried out to phase compensation, draw data after corresponding multiple phase compensations.
Orientation is to process of pulse-compression: orientation adopts the mode of matched filtering to process of pulse-compression, and frequency modulation rate is with apart from space-variant.In processing in real time, in order to reduce operand, we directly construct Frequency Domain Pulse reference function (being adaptation function), its reference function S
ref(f
a, R
b) be:
Wherein R
bfor the minimum distance of the target range carrier aircraft line of flight, f
afor Azimuth Doppler Frequency.F
aMfor being positioned at the maximum Azimuth Doppler Frequency of echo of carrier aircraft dead ahead point target, λ is the wavelength (carrier wavelength) that airborne synthetic aperture radar outwards transmits.In order to suppress secondary lobe, directly add Hamming window at frequency domain, window length is the width that frequency domain reference function is corresponding.
Data are carried out respectively orientation after process of pulse-compression after to multiple phase compensation, draw data after corresponding multiple orientation pulse pressure;
Look processing: after each orientation pulse pressure, in data, each data are wherein taken absolute value, then, the summation that adds up of an adjacent Q data, can reduce so the intrinsic coherent speckle noise of radar image more.Q is for looking number more, in the embodiment of the present invention, and Q=4.
Data after multiple orientation pulse pressure are carried out looking respectively processing more, draw corresponding multiple block image data.
In step S3, three dsp chips (the second dsp chip, the 5th dsp chip and the 6th dsp chip) synchronously carry out kinematic parameter matching, phase compensation, orientation to process of pulse-compression, look processing more, greatly shortened the time of data processing.
S4: the 8th dsp chip carries out entire image quantification, Image Mosaics processing to above-mentioned block image data in real time, finally obtains a width SAR image.
After step S4, the SAR image drawing is sent to host computer.
Validity of the present invention can be further illustrated by measured data:
With reference to Fig. 3, be the SAR imaging results figure of measured data.As can be seen from Figure 3, it is good that institute is image focusing effect, verified feasibility and the validity of real-time conceptual design.
Obviously, those skilled in the art can carry out various changes and modification and not depart from the spirit and scope of the present invention the present invention.Like this, if these amendments of the present invention and within modification belongs to the scope of the claims in the present invention and equivalent technologies thereof, the present invention is also intended to comprise these changes and modification interior.
Claims (4)
1. the SAR real-time imaging processing method based on FPGA and many DSP, is characterized in that, comprises the following steps:
S1: utilize airborne synthetic aperture radar to receive echo data, described echo data is sent in fpga chip, described echo data is carried out to distance successively to process of pulse-compression, Digital Down Convert processing, to, through Digital Down Convert data after treatment along orientation to carrying out piecemeal, obtain multiple sub-apertures data; Fpga chip is sent to every sub-aperture number certificate in the first dsp chip in order;
S2: the first dsp chip is by the order that receives sub-aperture data, each sub-aperture number certificate is alternately sent to the 3rd dsp chip, the 4th dsp chip and the 7th dsp chip, the 3rd dsp chip, the 4th dsp chip or the 7th dsp chip, according to the sub-aperture data that receive, carry out the estimation of Doppler center, range migration correction, doppler frequency rate estimation, kinematic parameter estimation; Draw the corresponding rear data of sub-aperture processing, after then the sub-aperture of correspondence being processed, data are sent to the first dsp chip;
S3: the first dsp chip is by the order that receives the rear data of sub-aperture processing, and after sub-aperture is processed, data are sent to the 8th dsp chip successively; The 8th dsp chip often receives a sub-aperture and processes rear data, after just this sub-aperture being processed, data are carried out distance to piecemeal processing, obtain three corresponding distances to block data, the 8th dsp chip is sent to respectively the second dsp chip, the 5th dsp chip, the 6th dsp chip by corresponding distance to three block datas; The second dsp chip, the 5th dsp chip or the 6th dsp chip are receiving all distances corresponding to a width SAR view data after block data, carry out kinematic parameter matching, phase compensation, orientation to process of pulse-compression, look processing more, obtain corresponding multiple block image data; The block image data of described correspondence are sent to the 8th dsp chip by the second dsp chip, the 5th dsp chip or the 6th dsp chip;
S4: the 8th dsp chip carries out entire image quantification, Image Mosaics processing to described block image data in real time, finally obtains a width SAR image.
2. the SAR real-time imaging processing method based on FPGA and many DSP as claimed in claim 1, it is characterized in that, in step S2, sub-aperture data processing chip carries out the estimation of Doppler center according to the sub-aperture data that receive, and draws the Doppler center that sub-aperture data are corresponding; Sub-aperture data processing chip carries out range migration correction, doppler frequency rate estimation according to the sub-aperture data that receive, and obtains doppler frequency rate corresponding to sub-aperture data; Sub-aperture data processing chip, according to doppler frequency rate corresponding to sub-aperture data, draws speed and the acceleration of carrier aircraft; Described sub-aperture data processing chip is the 3rd dsp chip, the 4th dsp chip or the 7th dsp chip;
In step S2, described sub-aperture is processed rear data and is comprised Doppler center corresponding to sub-aperture data, corresponding doppler frequency rate, the speed of carrier aircraft and the acceleration of carrier aircraft of sub-aperture data.
3. the SAR real-time imaging processing method based on FPGA and many DSP as claimed in claim 1, it is characterized in that, in step S3, distance is receiving all distances corresponding to a width SAR view data after block data to block data process chip, carry out kinematic parameter matching, draw multiple data through kinematic parameter matching;
Then respectively multiple data through kinematic parameter matching are carried out to phase compensation, draw data after corresponding multiple phase compensations; Data after multiple phase compensation are carried out respectively to orientation to process of pulse-compression, draw data after corresponding multiple orientation pulse pressure; Data after multiple orientation pulse pressure are carried out looking respectively processing more, draw corresponding multiple block image data.
4. the SAR real-time imaging processing method based on FPGA and many DSP as claimed in claim 3, it is characterized in that, in step S3, drawing data after corresponding multiple phase compensations, the mode that adopts matched filtering to multiple phase compensation after data carry out respectively orientation to process of pulse-compression.
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| CN109613536A (en) * | 2019-01-11 | 2019-04-12 | 中国电子科技集团公司第三十八研究所 | A kind of satellite-borne SAR real-time processing device and method |
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