CN107907867B - A kind of real-time SAR quick look system of multi-operation mode - Google Patents
A kind of real-time SAR quick look system of multi-operation mode Download PDFInfo
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- CN107907867B CN107907867B CN201710910101.6A CN201710910101A CN107907867B CN 107907867 B CN107907867 B CN 107907867B CN 201710910101 A CN201710910101 A CN 201710910101A CN 107907867 B CN107907867 B CN 107907867B
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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
- 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
- G01S7/292—Extracting wanted echo-signals
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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
- G01S13/904—SAR modes
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- Radar, Positioning & Navigation (AREA)
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Abstract
The present invention provides a kind of real-time SAR quick look systems of multi-operation mode, including original data record and distribution subsystem, real-time decompression and imaging subsystems, synthesis display and analyzing subsystem, the system is communicated using serial Rapid IO, SAR band pattern, scanning imagery mode, hyperfine mode or the imaging for sliding beam bunching mode are carried out to radar return data by the way of multiple DSP parallel processings simultaneously, SAR load image data frame is obtained, and SAR load image data frame is quickly shown.The system realizes the real-time Quicklook of multi-operation mode SAR echo data.
Description
Technical field
The present invention relates to a kind of real-time SAR quick look systems of multi-operation mode, belong to Real-time digital signal processing technology neck
Domain.
Background technique
The data that remote sensing satellite SAR load passes down are that the SAR load comprising auxiliary data and radar return data information is former
Beginning data, according to design of satellites operating specification and SAR image-forming principle, the load initial data that satellite passes down must carry out BAQ solution
After compression processing, imaging, visual image data could be obtained.
Multi-operation mode is that SAR satellite realizes SAR load using different polarization characteristics and different radar styles of shooting
A kind of mode maximally utilized.And traditional SAR quick look system can only adapt to single polarization, either simplex operation mode is handled in real time.No
Conducive to the development of SAR satellite ground test job, interpretation data can not be efficiently obtained.Therefore, a kind of multi-operation mode is studied
Real-time SAR quick look system improve interpretation efficiency and save hardware cost and be necessary.
Summary of the invention
Technology of the invention solves the problems, such as: overcoming the deficiencies of the prior art and provide a kind of real-time SAR of multi-operation mode
Quick look system realizes real-time decompression and imaging subsystems using the embedded real time processing system of more DSP, to satellite SAR load
The multi-operation mode synthetic aperture radar raw radar data passed down carries out BAQ decompression, real time imagery, real-time interpretation, data
The processing such as analysis, realizes the real-time Quicklook of multi-operation mode SAR echo data.
The technical solution of the invention is as follows: a kind of real-time SAR quick look system of multi-operation mode, including initial data note
Record and distribution subsystem, real-time decompression and imaging subsystems, synthesis display and analyzing subsystem, in which:
Original data record and distribution subsystem receive externally input SAR load initial data frame, and SAR load is former
Beginning data frame is stored into local hard drive, while it is forwarded to real-time decompression and imaging subsystems in real time；
The SAR load that real-time decompression and imaging subsystems, parsing original data record and distribution subsystem forward in real time
Initial data frame, the radar return data and its corresponding auxiliary data compressed, is sent to synthesis display for auxiliary data
With analysis system, the corresponding compact model of radar return data, compression ratio and imaging pattern that auxiliary data is compressed are parsed,
According to compact model and compression ratio, processing is unziped it to the radar return data of compression, obtains radar return data, according to
Imaging pattern carries out SAR imaging to radar return data by the way of multiple DSP parallel processings, obtains SAR load diagram
As data frame, SAR load image data frame is forwarded to synthesis display and analyzing subsystem；The auxiliary data includes SAR
The corresponding frame count of load initial data frame, the imaging pattern include: that the imaging pattern includes band pattern, scanning imagery
Mode, hyperfine mode and sliding beam bunching mode；
Synthesis display and analyzing subsystem receive and store the SAR load diagram that real-time decompression and imaging subsystems are sent
Picture data frame splices it with corresponding auxiliary data according to the frame count in auxiliary data, by spliced SAR load diagram
As data frame real-time display, real-time interpretation and data analysis.
The real-time decompression and imaging subsystems include M Embedded Processor, original data record and distribution subsystem
SAR load initial data frame is distributed to M Embedded Processor by system, and M Embedded Processor is parallel to SAR load original number
It parses to obtain the radar return data of auxiliary data and compression according to frame, the radar return data of compression is unziped it and are handled
To radar return data, Real-time processing is carried out to radar return data, and the SAR image data after processing are sent to
Synthesis display and analyzing subsystem.
Each Embedded Processor includes decompression module and real time imagery module, in which:
Decompression module completes the real-time decompression to SAR load initial data frame according to compression ratio, after decompression
Radar return data are sent to real time imagery module in real time, and the auxiliary information after decompression is sent to synthesis display in real time and is divided
Analyse subsystem；
Real time imagery module, the radar return data after receiving the decompression that decompression module exports in real time, according to imaging
Mode completes the real time imagery to the radar return data after decompression, by the SAR load image data and supplementary number after imaging
According to the data splicing module for being sent to synthesis display and analyzing subsystem.
The real time imagery module includes that scheduler module, N number of parallel processing module and memory module, scheduler module connect in real time
The radar return data that decompression module is sent are received, are deposited into memory module, when the data of size are completely preset in every collection, in turn
Imaging enabled instruction is sent to N number of processing module；After processing module receives imaging enabled instruction, specified storage address is accessed
The radar return data in space resolve into corresponding imaging algorithm R stage, each stage, N according to imaging pattern difference
A processing module executes identical processing to the radar return data accessed parallel, after completion, updates corresponding storage ground
The radar return data in location space, and stage completion mark is issued to scheduler module, scheduler module receives all N number of processing modules
After the stage of transmission completes mark, N number of processing module is notified to execute the processing task in next stage parallel, until algorithm is complete
It is SAR image data at the radar return data updated storage in module.
Between the original data record and distribution subsystem and real-time decompression and imaging subsystems and real-time decompression
And it is all made of RapidIO bus between imaging subsystems and synthesis display and analyzing subsystem and is communicated.
Original data record and distribution subsystem and real-time decompression and imaging subsystems by the real-time forwarding module of data,
PCIE data control block and SRIO sending module externally send data, specific communication mode are as follows:
Data frame to be sent is stored in physical memory page by the real-time forwarding module of data by page, and will be in Data Physical
Address link list, is then stored in specified physical memory page, address link list by the first address composition address link list for depositing page by page
The initial address of one page under every page the last one memory space storage address chained list, when sending data, by address chain heading
Location be stored in PCIE data control block, by PCIe data control module from Installed System Memory specify physical memory page in first address
The address link list for starting reading designated length, actively reads data by the address in chained list, and SAR initial data is sent to
SAR initial data is switched to Serial RapidIO data protocol format, is sent to reality by SRIO sending module, SRIO sending module
When decompression and imaging subsystems.
The synthesis display and analyzing subsystem include data splicing module, real-time reading module, real-time display module and
Data analysis module, real-time reading module, real-time display module and data analysis module concurrent working, in which:
The auxiliary data and SAR load picture number that data splicing module, reception decompression and imaging subsystems issue in real time
According to completing auxiliary data according to frame count and spliced with SAR load image data, by spliced auxiliary data and SAR load
Lotus image data is sent into real-time display module, isolates supplementary number from spliced auxiliary data and SAR load image data
According to real-time reading module is sent into, SAR load image data is isolated from spliced auxiliary data and SAR load image data
It is sent into data analysis module；
Real-time display module, from the spliced auxiliary data of data splicing module real-time reception and SAR load image data,
Fast view in real time is carried out in screen specified window.
Real-time reading module receives auxiliary data from data splicing module, directly presses preset differentiation in system memory
Standard carries out real-time interpretation, and the default interpretation standard includes the correctness of the continuity of frame count, frame count total amount；
Data analysis module receives SAR load image data from data splicing module, according to peak sidelobe ratio index analysis
The peak sidelobe ratio index of the acquired SAR load image data of this imaging of process analysis.
The real-time decompression and imaging subsystems further include exchange routing module, and the exchange routing module connection is original
Data record and distribution subsystem, synthesis display and analyzing subsystem and all M Embedded Processors, the exchange route mould
Block is made of 3 pieces of SRIO exchange chips, and exchange chip communicates two-by-two.
The beneficial effect of the present invention compared with the existing technology is:
(1), real-time decompression and imaging subsystems of the present invention utilize multiple Embedded Processors, and each processor is using more
Multi-operation mode synthetic aperture radar original time passed down to satellite SAR load is realized in the embedded parallel real time data processing of DSP
Wave number improves processing capability in real time according to BAQ decompression, full resolution imaging is carried out；
(2), the present invention is between original data record and distribution subsystem and real-time decompression and imaging subsystems and real
When decompression and imaging subsystems and synthesis display and analyzing subsystem between be all made of serial Rapid IO and communicated, improve
The real-time of data transmission；
(3), synthesis display of the present invention and analyzing subsystem use parallel form, at the same to data carry out real-time interpretation,
Real-time display and data analysis, enhance the processing and interpretation ability of high-resolution multi-operation mode SAR echo remotely-sensed data, realize
The real-time processing of processing overall process, improves test interpretation efficiency and interpretation quality.
Detailed description of the invention
Fig. 1 is the system model of the embodiment of the present invention；
Fig. 2 is data flow architecture of the embodiment of the present invention；
Fig. 3 is the interaction diagrams of PCIe data of embodiment of the present invention control module and initial data forwarding module；
Fig. 4 is routing table of embodiment of the present invention SRIO topological structure；
Fig. 5 is that BAQ of the embodiment of the present invention decompresses flow chart；
Fig. 6 is band pattern of embodiment of the present invention imaging algorithm flow chart；
Fig. 7 is that two step imaging algorithm flow chart of the embodiment of the present invention and orientation go oblique process flow；
Fig. 8 is CUDA of embodiment of the present invention sampling flow chart；
Fig. 9 is that integral secondary lobe of the embodiment of the present invention compares analysis flow chart diagram.
Specific embodiment
The present invention will be further described in detail with reference to the accompanying drawing:
As shown in Figure 1 and Figure 2, the real-time SAR quick look system embodiment of a kind of multi-operation mode provided by the invention, mainly
By an original data record and distribution subsystem, two real-time decompressions and imaging subsystems, two synthesis displays and analysis
Subsystem composition.Wherein, synthesis display and analyzing subsystem are the high performance graphics work station of the array containing RAID disk.The original
Between beginning data record and distribution subsystem and real-time decompression and imaging subsystems and real-time decompression and imaging subsystems with
It is all made of RapidIO bus between synthesis display and analyzing subsystem and gigabit Ethernet is communicated.Wherein, kilomega network is used to
Control instruction is transmitted, RapidIO bus is used to transmitting high speed data.
Two real-time decompressions and imaging subsystems and two synthesis displays and analyzing subsystem concurrent working, or use
Ping-pong work, to improve the processing capability in real time of whole system.
The specific design with regard to above three subsystem is introduced individually below and is realized.
1, original data record and distribution subsystem
Original data record and distribution subsystem receive externally input SAR load initial data frame, and SAR load is original
Data frame is stored into local hard drive, while it is forwarded to real-time decompression and imaging subsystems in real time.The subsystem altogether wraps
Include 7 submodules, respectively task control module, initial data receiving module, original data record module, initial data playback
Module, initial data forwarding module, PCIE data control block, SRIO sending module.
1.1, task control module
Task control module on original data record and distribution subsystem, which is mainly responsible for, receives appointing for tester's input
Business information.Task control module controls the task execution process of entire software, and be responsible for the starting of management other software module with
Stop.
1.2, initial data receiving module
Data reception module receives SAR load initial data by optical fiber, and data deposit Installed System Memory is done high speed and is faced
When data buffer storage.In DRP data reception process, the module real-time judge data receiving state include: data whether link setup success,
Whether data are normal, receive data rate, receive data total size etc., judicious data are sent to original data record
Module is stored.According to the frame count of SAR load initial data, frame head, judge whether SAR load initial data is normal frame by frame
The frame count value that the SAR load initial data frame of mistake occurs is sent to synthesis by (by frame head, frame count, being increased continuously)
Display and analyzing subsystem.
1.3, original data record module
Record object: the correct SAR load initial data of format；
Recording mode: record in real time；
Record length: meeting single maximum amount of data * 1000 times record lengths, and individual auxiliary data will demand perfection test
Period all stores；
Original data record module receives and is buffered to data reception module Installed System Memory and verify format and correctly counts
According to progress real-time storage.Storage when by date the time divide catalogue, according to receive data type according to specified naming rule into
Row is named and is stored.
Catalogue division rule are as follows: and " data root year moon-day ", as " data 2012 06-18 "
File designation rule are as follows: " operating mode _ receiving time (date _ Hour Minute Second) ", such as " xxxx_20120618_
153726.raw”。
In recording process, to guarantee to write disk rate, is written using no buffer mode, size is written every time and is set as 16MB.
According to using there is buffer mode write-in precise length file data is written, file size is less than 16MB, according to reality in one block number of most end
The write-in of border file size.On the one hand raising can be write direct using long data block according to disk feature by carrying out disk write-in in this way
Write efficiency, on the other hand can be with the data file of the non-16MB integral multiple of compatible data size.
When original data record, each raw data file matches an auxiliary information file, when recording this file reception
Rate.
1.4, initial data playback module
Playback object: the initial data of original data record module record；
Playback rate: normal data input rate；
Playback mode is divided into single playback and playback cycle；
Initial data playback module finds the playback file that user specifies according to external instruction, and by file content according to
Specified data assignment format, assigned rate read in Installed System Memory and carry out speed buffering, are read out by initial data forwarding module
It broadcasts.The rate file that record is read when playback, is played back by the rate in file.
1.5 initial data forwarding modules
The real-time forwarding module of data is responsible for for initial data being distributed to real-time decompression in real time and imaging subsystems carry out in fact
When handle.Data frame to be sent is stored in physical memory page by the real-time forwarding module of data by page, and by Data Physical memory
The first address of page forms address link list, is then stored in address link list in specified physical memory page by page, address link list is every
The initial address of one page under the last one memory space storage address chained list of page, when sending data, by address link list first address
It is stored in PCIE data control block.
1.6, PCIE data control block
PCIe data control module reads designated length since the first address in the physical memory page that Installed System Memory is specified
Address link list, actively read data by the address in chained list, and SAR initial data is sent to SRIO sending module.It is all
The data read operation of Installed System Memory is realized with DMA, to reach higher data transfer rate.PCIe data control module with it is original
The interactive process of data forwarding module is as shown in Figure 3.
1.7, SRIO sending module
SAR initial data is switched to Serial RapidIO data protocol format by SRIO sending module, is sent to real-time solution
Compression and imaging subsystems.
2, real-time decompression and imaging subsystems
Real-time decompression and imaging subsystems include exchanging routing module and M Embedded Processor, and SAR load is original
Data frame is distributed to M Embedded Processor by exchanging routing module, and M Embedded Processor parses initial data note parallel
The SAR load initial data frame that record is forwarded in real time with distribution subsystem, radar return data compressed and its corresponding auxiliary
Data are helped, auxiliary data is sent to synthesis display and analysis system, the radar return data that parsing auxiliary data is compressed
Corresponding compact model, compression ratio and imaging pattern carry out the radar return data of compression according to compact model and compression ratio
Decompression obtains radar return data, according to imaging pattern, to radar return by the way of multiple DSP parallel processings
Data carry out SAR imaging, obtain SAR load image data frame, by SAR load image data frame be forwarded to synthesis display with
Analyzing subsystem；The auxiliary data includes the corresponding frame count of SAR load initial data frame, frame length and present frame
Information such as longitude and latitude and height etc..
2.1, routing module is exchanged
Exchange routing module connection original data record and distribution subsystem, synthesis display and analyzing subsystem and all M
A Embedded Processor.Exchange routing module deploys three pieces of exchange chips, and three pieces of exchange chips are connected two-by-two, each exchange core
In piece can programming exchange routing program, specify data interaction between the ID of each switching port and each port in routing program
Path constitutes exchange network.It is transparent point-to-point transmission, Mei Geshe between each processing node device on SRIO exchange network
Slave node has its unique node ID number (see the DestID in Fig. 4) as identifying, comprising purposeful in the data packet of transmission
The ID number information of equipment broadcasts real-time decompression according to different SRIO node ID numbers and imaging subsystems is embedded accordingly
Processor.For switching equipment, each of which port all connects unique processing node device (purpose equipment), therefore each
Port all uniquely corresponds to a purpose equipment ID number.Therefore, the effect of Tsi568 routing table is exactly to determine each port output
Purpose ID number, exchanger determine correct output port according to the purpose ID number in data packet.Safeguard a sheet in each port
The routing table information of port.Furthermore switching equipment does not support multicast, and therefore, an ID number cannot be configured to multiple ports.Fig. 4 institute
It is shown as routing table SRIO topological structure.DestID is the corresponding purpose equipment ID number in the port.In the routing table of two versions
In configuration file, all port speeds by InfiniBand connection are each configured to 2.5Gbps.
2.2, Embedded Processor
Each Embedded Processor includes 6 functional modules, respectively decompression module, Real-time processing module, number
According to stream management module, SRIO sending module.
2.2.1, decompression module
Decompression module completes the real-time decompression to SAR load initial data frame according to compression ratio, after decompression
Radar return data are sent to real time imagery module in real time, and the auxiliary information after decompression is sent to synthesis display in real time and is divided
Analyse subsystem.
In the present embodiment, direct mode operation adds three kinds of compact models, three kinds of compact models are as follows: high four interceptions mode is (in star
Upper directly interception Gao Siwei), 8:4BAQ and 8:3BAQ compact model.Decompression module can to directly intercepted on star Gao Siwei,
The data of tri- kinds of data compression schemes of 8:4BAQ and 8:3BAQ unzip it processing.Wherein, for directly intercepting Gao Si on star
The compress mode of position, Gao Siwei is read out, low four zero paddings.BAQ decompression module is deployed in every piece of 8DSP processing
In 2 fpga chips of plate.
Implementation step is as follows:
(a), to the deblocking compressed, the amplitude equalizing value of sample in calculation block, with obtained mean value look into mean value with
Standard deviation statistics table obtains the standard deviation of data；
(b), standard deviation table corresponding with optimal quantization level is looked into from standard deviation, obtains optimal quantization level threshold, it will be in block
Data sample and threshold value comparison are encoded (serial number for tabling look-up), include a bit sign position in coding；
(c), coding and corresponding piece of amplitude equalizing value are reached into ground down together；
(d), data are unziped it according to decoding value table according to amplitude equalizing value using coding and corresponding block number.
For example, in satellite load, using the method that 3bitBAQ compresses, piecemeal size is taken as 512 (distance to) × 4
(orientation).I, 8 sampled data stet positions of Q indicate that low 7 of data amplitude send accumulator array cumulative, obtain
The mean value (taking 6 high) of each piecemeal.Looking into BAQ code table according to 6 mean values, to can be obtained data standard poor, in conjunction with optimal quantization level
Low 2 of each data sample coding can be obtained in corresponding table, are combined into 3 compressed datas with symbol-bit groupings, and 6 data mean values are made
The auxiliary data of radar data present frame is incorporated into for BAQ code.When decompression processing, according to the mean value of every block number evidence by tabling look-up and can obtain
It is poor to data standard, 8 initial data can be restored in conjunction with the coding of each sampled point.
As shown in figure 5, BAQ decompresses process are as follows:
(1), it obtains (512*3/8) * 4 and is divided into S block；
(2), each data block is obtained to step (1) and executes following steps, owned:
(2.1), the data block is shifted to obtain 512*4 3 codings；
(2.2), 3 codings are tabled look-up to obtain table；
(2.3), it averages, tables look-up to data block；
(2.4), it is multiplied and obtains decoding value, 1/S.
2.2.2, Real-time processing module
Real-time processing module receives the radar return data after the decompression that exports in real time of decompression module, according at
As mode, the real time imagery to the radar return data after decompression is completed, by the SAR load image data and auxiliary after imaging
Data are sent to the data splicing module of synthesis display and analyzing subsystem.The imaging pattern includes band pattern, is scanned into
As mode, hyperfine mode and sliding beam bunching mode.
The real time imagery module includes scheduler module, N number of parallel processing module and memory module, wherein
Memory module, the radar return data after the decompression that storage decompression module is sent；The real time imagery mould
Block includes scheduler module, N number of parallel processing module and memory module, the radar that scheduler module real-time reception decompression module is sent
Echo data, is deposited into memory module, when the data of the completely default size of every collection, sends imaging enabled instruction in turn to N number of
Processing module；After processing module receives imaging enabled instruction, the radar return data of specified memory address space, root are accessed
According to imaging pattern difference, corresponding imaging algorithm is resolved into R stage, each stage, N number of processing module is parallel to being accessed
Radar return data execute identical processing, after completion, update the radar return data of corresponding memory address space, and
The sending stage completes mark to scheduler module, and the stage that scheduler module receives all N number of processing modules transmissions completes after identifying,
N number of processing module is notified to execute the processing task in next stage parallel, until algorithm is completed to update storage the radar in module
Echo data is SAR image data.
When imaging pattern is band pattern, radar return initial data progress orientation Fourier transformation is extracted line by line and is obtained
To distance-Doppler domain data, the Chirp Scaling factor is constructed, this factor is multiplied with distance-Doppler domain data,
To treated, data carry out distance to Fourier transformation again, obtain two-dimensional frequency data, and the storage of two-dimensional frequency data is arrived should
The specified memory address space (covering original data) of processing module, and first step complement mark is fed back to scheduler module；It receives
To after second step instruction, completion distance obtains distance to picture number to inverse Fourier transform after carrying out Range compress, compressing
According to being stored in corresponding memory space later, feedback second step complement mark to scheduler module；After receiving third step instruction, visit
It asks the data after second step processing, carries out Azimuth Compression and directional correction, carry out orientation Fourier inversion after correction
Distance is got in return to image data.
When imaging pattern is scanning imagery mode, radar return initial data is extracted line by line and carries out the change of orientation Fourier
It changes, obtains distance-Doppler domain data, the Chirp Scaling factor is constructed, by this factor and distance-Doppler domain data
It is multiplied, then to treated, data carry out distance to Fourier transformation, obtain two-dimensional frequency data, two-dimensional frequency data are stored
The memory address space (covering original data) specified to the processing module, and first step complement mark is fed back to dispatching mould
Block；After receiving second step instruction, construction Range compress phase factor is carried out, this factor is multiplied completion with two-dimensional frequency data
Distance is completed after Range compress, compression obtains distance to image data, the corresponding storage of deposit later to inverse Fourier transform
Space, feedback second step complement mark to scheduler module；Number after receiving third step instruction, after access second step processing
According to construction phase correction factor carries out Azimuth Compression and directional correction, carries out orientation inverse Fourier transform after correction and obtain
To orientation image data；It is transferred to step 4: construct reference signal, this reference signal is multiplied other side with orientation image data
Position is gone tiltedly to handle to data, makees fourier transform of azimuth to the signal after going tiltedly, obtains imaging results.
When imaging pattern be hyperfine mode when, respectively to twin-channel data extract line by line radar return initial data into
Row orientation Fourier transformation obtains distance-Doppler domain data, carries out Based on Dual-Aperture fusion to double-channel data, constructs Chirp
This factor is multiplied by the Scaling factor with distance-Doppler domain data, then to after Based on Dual-Aperture fusion treatment data carry out away from
Descriscent Fourier transformation obtains two-dimensional frequency data, the storage address that the storage of two-dimensional frequency data is specified to the processing module
Space, and first step complement mark is fed back to scheduler module；After receiving second step instruction, after progress Range compress, compression
It completes distance and obtains distance to image data to inverse Fourier transform, be stored in corresponding memory space later, feedback second step is complete
At mark to scheduler module；Receive third step instruction after, access second step processing after data, carry out Azimuth Compression and
Directional correction carries out orientation inverse Fourier transform after correction and obtains distance to image data.
Sliding beam bunching mode can solve the orientation image scene width and azimuth resolution this conflict of SAR,
The azimuth resolution of its system is better than the resolution ratio of band pattern, while the orientation width of image scene is also greater than classics
The scene width of beam bunching mode.However the advantages of sliding pack, also brings the difficulty in processing simultaneously for it, in order to effectively
Data transfer rate is reduced, it is right that spaceborne Sliding spotlight SAR medium-PRF is greater than scene institute less than orientation Doppler full bandwidth
The instantaneous Doppler bandwidth answered, therefore there is serious lack sampling in raw radar data orientation echo.Mode is sliding
When beam bunching mode, the method that we take is the doppler bandwidth for first passing through orientation and removing the low orientation signal of oblique deascension, then again
Carry out two-dimentional echo suppression processing.Scanning imagery can be used by sliding two-dimension focusing processing in two step imaging algorithms of beam bunching mode
The identical algorithm of mode.Fig. 7 gives the flow chart of two step imaging algorithms processing Sliding spotlight SAR echo, the right side of flow chart
It provides detailed orientation and goes oblique treatment process.
2.2.3, memory module
In SAR process flow, adjust the distance first to pulse pressure processing is carried out with obtain this to high-resolution, then other side
Position is to signal processing method is used, so that one bigbore radar of Data Synthesis that acquisition comes.Therefore, we are in SAR algorithm
In the process, it needs then to carry out column vector processing again, in this process just to the processing of the advanced every trade vector of two-dimensional matrix
It needs to carry out transposition to matrix.
We usually use the DDR2 memory stores data of large capacity in Project Realization, during making DDR2,
It is divided into many fritters inside it, is referred to as page this each piece.No matter sequence reads or jumps the efficiency read in one page
It is all identical, but when the jump length of data is too big, cross-page phenomenon can be generated.This allows for needing in operation matrix data
Constantly to switch page, so that efficiency greatly reduce.
One page size is 8KB in current DDR2 memory, however any dimension data length in SAR algorithm can all surpass
Cross one page range.When only progress distance is handled to (row), because it is that sequence operates, available very high bandwidth.But
In orientation (column) processing, often take any that will carry out cross-page operation, this is greatly lowered orientation point bandwidth, practical to jump
16K 64bit reads bandwidth 330MB, and bus theoretical bandwidth is 800MB/s.
We use existing storage scheme technology thus, and the program is established on distributed processing node, in this way may be used
To expand DDR2 capacity, while parallel processing also may be implemented, in addition the method in single node using software is to internal memory operation,
Operating efficiency identical with hardware is equally reached.The hardware limitation in single node, while but also storage are broken in this way
Capacity and treatment effeciency are improved.
2.2.4, data stream management module
Data stream management module is deployed in the dsp chip of each block of 8DSP plate, is responsible for being precisely controlled every portion to be processed
Data flow trend.In the work of embedded real-time processing subsystem, data flow from the RapidIO input port of power board first
It is input to first piece of 8DSP Embedded Processor.LINK is successively transmitted to machine between data are switched to plate in first piece of 8DSP board
Each piece of board in case.Each Embedded Processor receives the partial data to one's name handled, copies after decompression
Shellfish carries out subsequent processing into onboard DDR memory.It is comprehensive that result that treated is divided to two-way to be output in parallel to by two power boards
It closes in display and analysis subsystem and carries out subsequent processing.
2.2.5 initial data forwarding module
The real-time forwarding module of data is responsible for for SAR load image data frame being distributed to real-time decompression and imaging subsystem in real time
System is handled in real time.Data frame to be sent is stored in physical memory page by the real-time forwarding module of data by page, and by data
The first address of physical memory page forms address link list, is then stored in address link list in specified physical memory page by page, ground
The initial address of one page under the last one memory space storage address chained list of every page of location chained list, when sending data, by address chain
Heading address is stored in PCIE data control block.2.2.6, PCIE data control block
PCIe data control module reads designated length since the first address in the physical memory page that Installed System Memory is specified
Address link list, actively read data by the address in chained list, and SAR initial data is sent to SRIO sending module.It is all
The data read operation of Installed System Memory is realized with DMA, to reach higher data transfer rate.PCIe data control module with it is upper
Machine data divide the interactive process of scape and forwarding module as shown in Figure 3.
2.2.7, SRIO sending module
SAR initial data is switched to Serial RapidIO data protocol format by SRIO sending module, is sent out by power board
It send to synthesis display and analyzing subsystem.
3, synthesis display and analyzing subsystem
Synthesis display and analyzing subsystem receive and store the SAR load image that real-time decompression and imaging subsystems are sent
Data frame splices it with corresponding auxiliary data according to the frame count in auxiliary data, by spliced SAR load image
Data frame quantization, sampling, real-time display, real-time interpretation and data analysis.
Synthesis display and analyzing subsystem include 9 functional modules, and respectively SRIO receiving module, PCIE upload management mould
Block, SAR load image data quantization modules, SAR load image data image decimation blocks, real-time display module, in real time
Reading module, real-time logging modle, real-time reading module, real time analysis module.
3.1, PCIe uploads management module
PCIe uploads management module and data reception module cooperates, and realizes purpose on high-speed data.
Every 4K address space is page, all pages of first address is put into an address link list, address link list is also deposited by page
Storage, last bit address of each address link list page fill in the first address of next address chained list page, and multiple address link lists exist
It calculates in memory, after booting, the first address of chained list is sent to PCI board card, PCI board card executes each subtask and sends data
Before, all address link lists are read, continuously transmit into address link list specified address space in sequence.
Data reception module opens up sufficiently large core buffer in system memory first, will be in the physics of the buffer area
It deposits beginning of the page address and is organized into multiple address link lists, last bit address of each address link list fills in the head of next address chained list
Address.The first address of first address link list is issued to PCIe and uploads management module, carries out the active upload process of data.
3.2, SAR load image data quantization module
Since video memory capacity is limited, it is not enough to load the complex data of every scape, therefore by the way of receiving while quantization,
As unit of 2GB, it is respectively transmitted to carry out parallel processing in video memory.
3.3SAR load image data frame image sampling module
Image data after quantization is copied in video memory as unit of regular length, it, will according to different sampling ratios
Data are divided into several small data blocks, and the sampling task of image is then completed in a manner of parallel pipelining process.Workflow such as Fig. 8 institute
Show.
3.4 real-time display modules
Real-time display module is responsible for all in fast view and shows related function.The spliced image data of real-time display and
Auxiliary data；Real-time display module receives spliced image data from data splicing module, using DirectDraw in screen
Fast view in real time is carried out in specified window.The characteristics of video memory can directly be accessed using DirectDraw, realizes rapid image interception, right
Part to be shown is needed quickly to be shown.Since the 4000 video card video memory of Quadro that system is equipped with is up to 2GB, so completely
Various operations are carried out after image being completely copied in video memory.Such as pause, translation, the conversion of numerical imaging display mode
Deng.
3.5 data splicing modules
The auxiliary data and SAR load picture number that data splicing module receives decompression and imaging subsystems issue in real time
According to completing auxiliary data according to frame count and spliced with SAR load image data, by spliced auxiliary data and SAR load
Lotus image data is sent into real-time display module, isolates supplementary number from spliced auxiliary data and SAR load image data
According to real-time reading module is sent into, SAR load image data is isolated from spliced auxiliary data and SAR load image data
It is sent into data analysis module.Due to entire splicing be all in the Installed System Memory and video memory of high performance graphics work station into
Row, so splicing rate can achieve entirely in real time.Splicing result can be sent to interface display.
3.6 real-time reading modules
Real-time reading module receives auxiliary data from data splicing module, directly marks in system memory by preset differentiation
Standard carries out real-time interpretation, and the default interpretation standard is that corresponding frame count continuity, frame technique are extracted from auxiliary data is total
Amount and flag of frame correctness, thus the continuity etc. of interpretation data.Specific interpretation content includes: image data and auxiliary data
Format, continuity, specific interpretation requires to be determined according to totally determining assistance data format formatting；Real-time interpretation image
Data synchronization character mark；Real-time interpretation image data lines count continuity；Real time parsing interpretation auxiliary data, including auxiliary data
The continuity etc. that interior SAR load-identification word, auxiliary data row count carries out interpretation.
Since all interpretations work is all completed in memory, it is based on 12 core server of dual processors, interpretation rate can achieve
It is complete real-time.
3.7 data analysis module
Data analysis module receives SAR load image data from data splicing module, according to peak sidelobe ratio index analysis
The peak sidelobe ratio index of the acquired SAR load image data of this imaging of process analysis.Analysis process is as shown in Figure 9.
Currently, existing 1 China in orbit is from SAR satellite is ground using the real-time SAR of multi-operation mode of the invention
Quick look system carries out the quick look processing of ground test task, which is adapted to no more than 450Mbps
The real-time SAR load original data processing demand of bit rate, the application attestation system are suitable for the SAR under multiple-working mode and return
Wave number factually when imaging task, it is generally applicable with each High Resolution SAR remote sensing satellite, test interpretation efficiency and interpretation quality be high.
The present invention is not described in detail content and is known to the skilled person technology.
Claims (5)
1. a kind of real-time SAR quick look system of multi-operation mode, it is characterised in that including original data record and distribution subsystem,
Real-time decompression and imaging subsystems, synthesis display and analyzing subsystem, in which:
Original data record and distribution subsystem receive externally input SAR load initial data frame, by SAR load original number
It stores according to frame into local hard drive, while it is forwarded to real-time decompression and imaging subsystems in real time；
Real-time decompression and imaging subsystems, parsing original data record and the SAR load that distribution subsystem forwards in real time are original
Auxiliary data is sent to synthesis display and divided by data frame, the radar return data and its corresponding auxiliary data compressed
Analysis system, the corresponding compact model of radar return data, compression ratio and the imaging pattern that parsing auxiliary data is compressed, according to
Compact model and compression ratio unzip it processing to the radar return data of compression, radar return data are obtained, according to imaging
Mode carries out SAR imaging to radar return data by the way of multiple DSP parallel processings, obtains SAR load picture number
According to frame, SAR load image data frame is forwarded to synthesis display and analyzing subsystem；The auxiliary data includes SAR load
The corresponding frame count of initial data frame, the imaging pattern include: that the imaging pattern includes band pattern, scanning imagery mould
Formula, hyperfine mode and sliding beam bunching mode；
Synthesis display and analyzing subsystem receive and store the SAR load picture number that real-time decompression and imaging subsystems are sent
According to frame, according to the frame count in auxiliary data, it is spliced with corresponding auxiliary data, by spliced SAR load picture number
It is analyzed according to frame real-time display, real-time interpretation and data；
The real-time decompression and imaging subsystems include M Embedded Processor, and original data record will with distribution subsystem
SAR load initial data frame is distributed to M Embedded Processor, and M Embedded Processor is parallel to SAR load initial data frame
Parsing obtains the radar return data of auxiliary data and compression, unzips it processing to the radar return data of compression and obtains thunder
Up to echo data, Real-time processing is carried out to radar return data, and the SAR image data after processing are sent to synthesis
Display and analyzing subsystem；
Each Embedded Processor includes decompression module and real time imagery module, in which:
Decompression module completes the real-time decompression to SAR load initial data frame according to compression ratio, by the radar after decompression
Echo data is sent to real time imagery module in real time, and the auxiliary information after decompression is sent to synthesis display and analysis in real time
System；
Real time imagery module, the radar return data after receiving the decompression that exports in real time of decompression module, according to imaging pattern,
The real time imagery to the radar return data after decompression is completed, by the SAR load image data and auxiliary data hair after imaging
Give the data splicing module of synthesis display and analyzing subsystem；
The real time imagery module includes scheduler module, N number of parallel processing module and memory module, scheduler module real-time reception solution
The radar return data that compression module is sent are deposited into memory module and send in turn when the data of size are completely preset in every collection
Enabled instruction is imaged to N number of processing module；After processing module receives imaging enabled instruction, specified memory address space is accessed
Radar return data, according to imaging pattern difference, corresponding imaging algorithm is resolved into R stage, each stage, N number of place
Reason modular concurrent executes identical processing to the radar return data accessed, and after completion, it is empty to update corresponding storage address
Between radar return data, and issue the stage and complete mark to scheduler module, scheduler module receives all N number of processing modules and sends
Stage complete mark after, notify N number of processing module to execute the processing task in next stage parallel, until algorithm complete more
Radar return data in new memory module are SAR image data.
2. a kind of real-time SAR quick look system of multi-operation mode according to claim 1, it is characterised in that: described original
Between data record and distribution subsystem and real-time decompression and imaging subsystems and real-time decompression and imaging subsystems with it is comprehensive
Close display be all made of RapidIO bus between analyzing subsystem and communicated.
3. a kind of real-time SAR quick look system of multi-operation mode according to claim 1, it is characterised in that: initial data
Record passes through the real-time forwarding module of data, PCIE data control block with distribution subsystem and real-time decompression and imaging subsystems
Data, specific communication mode are externally sent with SRIO sending module are as follows:
Data frame to be sent is stored in physical memory page by the real-time forwarding module of data by page, and by Data Physical page
First address form address link list, then address link list is stored in specified physical memory page by page, every page of address link list
The last one memory space storage address chained list under one page initial address, send data when, address link list first address is deposited
Enter PCIE data control block, by PCIe data control module since the first address in the physical memory page that Installed System Memory is specified
The address link list for reading designated length actively reads data by the address in chained list, and SAR initial data is sent to SRIO hair
Module is sent, SAR initial data is switched to Serial RapidIO data protocol format, is sent to real-time decompression by SRIO sending module
Contracting and imaging subsystems.
4. a kind of real-time SAR quick look system of multi-operation mode according to claim 1, it is characterised in that the synthesis is aobvious
Show that with analyzing subsystem include data splicing module, real-time reading module, real-time display module and data analysis module, sentences in real time
Read through model, real-time display module and data analysis module concurrent working, in which:
The auxiliary data and SAR load image data that data splicing module, reception decompression and imaging subsystems issue in real time, root
It completes auxiliary data according to frame count to be spliced with SAR load image data, by spliced auxiliary data and SAR load image
Data are sent into real-time display module, and auxiliary data is isolated from spliced auxiliary data and SAR load image data and is sent into
Real-time reading module isolates SAR load image data from spliced auxiliary data and SAR load image data and is sent into number
According to analysis module；
Real-time display module is being shielded from the spliced auxiliary data of data splicing module real-time reception and SAR load image data
Fast view in real time is carried out in curtain specified window；
Real-time reading module receives auxiliary data from data splicing module, directly presses preset discrimination standard in system memory
Real-time interpretation is carried out, the default interpretation standard includes the correctness of the continuity of frame count, frame count total amount；
Data analysis module receives SAR load image data from data splicing module, according to peak sidelobe ratio index analysis process
Analyze the peak sidelobe ratio index of the acquired SAR load image data of this imaging.
5. a kind of real-time SAR quick look system of multi-operation mode according to claim 1, it is characterised in that: described real-time
Decompression and imaging subsystems further include exchange routing module, the exchange routing module connection original data record and distribution
System, synthesis display and analyzing subsystem and all M Embedded Processors, the exchange routing module are exchanged by 3 pieces of SRIO
Chip is constituted, and exchange chip two-by-two communicates.
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