CN110415163A - Data matrix transposition method and device for SAR imaging - Google Patents
Data matrix transposition method and device for SAR imaging Download PDFInfo
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- CN110415163A CN110415163A CN201910582987.5A CN201910582987A CN110415163A CN 110415163 A CN110415163 A CN 110415163A CN 201910582987 A CN201910582987 A CN 201910582987A CN 110415163 A CN110415163 A CN 110415163A
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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
- G06—COMPUTING; CALCULATING OR COUNTING
- G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
- G06T1/00—General purpose image data processing
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Abstract
The present invention provides a kind of data matrix transposition methods and device for SAR imaging, belong to SAR technical field of imaging.Wherein, the data matrix transposition method for SAR imaging, which is characterized in that the described method includes: data matrix is carried out piecemeal according to piecemeal principle, obtain piecemeal submatrix；The address mapping relation that data in the piecemeal submatrix are pressed to the piecemeal submatrix and DDR, is stored in the different BANK in the DDR；The column data of burst-length is successively read from the different BANK of the DDR, and in transposition deposit QDR；The single-row data in the QDR are exported, are imaged for SAR.Provided by the present invention for the data matrix transposition method and device of SAR imaging, it is accessed using piecemeal submatrix method to DDR memory data, so that reaching a kind of equilibrium state to the access of row data and column data in matrix, data access efficiency is improved using three-dimensional address of cache, transposition function is reduced and realizes difficulty.
Description
Technical field
The present invention relates to SAR technical field of imaging more particularly to it is a kind of for SAR imaging data matrix transposition method and
Device.
Background technique
Synthetic aperture radar (SAR) Real-time processing has strict requirements to system processing speed, with data volume
Increase, the increase for the treatment of scale, so that central processing unit (CPU) is difficult to meet SAR real time imagery requirement, field programmable gate
Containing resources such as a large amount of LUT, DSP, RAM inside array (FPGA), has the advantages that arithmetic speed is fast, be widely used in
In SAR Real-time processing.
SAR real time imagery is related to large-scale data processing, and huge data can not be directly deposited in inside FPGA
In storage unit, and must external mass storage.Double Data Rate synchronous memories (DDR) fast, capacity with speed
Greatly, steady performance is widely used in radar real time signal processing as the external memory of FPGA.Radar is real
When signal processing in addition to include complex data operation other than further include large-scale data matrix transposition read-write operation.The read-write of DDR walks
Suddenly it is " closing of row opening-data access-row ".It needs to carry out line activating operation before opening of being expert at, needs to carry out before closing of being expert at
Precharge operation can not access to DDR data during line activating and precharge.And it is frequent in data matrix
In transposition operation, needs to carry out a large amount of inter-bank data access operation to DDR, and then affect the access efficiency of DDR, increase
The data matrix transposition operating time.
DDR is to carry out reading and writing data based on burst-length (BURST) mode, and write-in or reading data can all operate every time
One BURST, i.e. 4,8 or 16 numbers of connected reference.Traditional data matrix transposition method is when carrying out DDR column operation, every time
A BURST length data will be read, as shown in FIG. 1, FIG. 1 is BURST for data reading form so that BURST length is 8 as an example
When being 8, data matrix transposition read operation process, SAR imaging has required precision i.e. to data access can only be handled every time
One column data, remaining data will be dropped, and this traditional DDR reading manner not only influences imaging efficiency, also will cause storage
The wasting of resources.
Summary of the invention
(1) technical problems to be solved
The present invention provides it is a kind of for SAR imaging data matrix transposition method and device, at least partly solve with
The technical issues of upper proposed.
(2) technical solution
According to an aspect of the invention, there is provided a kind of data matrix transposition for SAR imaging
Method, which comprises
The data matrix is subjected to piecemeal according to piecemeal principle, obtains piecemeal submatrix；
The address mapping relation that data in the piecemeal submatrix are pressed to the piecemeal submatrix and DDR, described in deposit
In different BANK in DDR；
The column data of burst-length is successively read from the different BANK of the DDR, and in transposition deposit QDR；
The single-row data in the QDR are exported, are imaged for SAR.
In some embodiments, the piecemeal principle are as follows: the data in each piecemeal submatrix is made to fully take up DDR's
A line in BANK.
In some embodiments, the data in the piecemeal submatrix are reflected by the address of the piecemeal submatrix and DDR
Relationship is penetrated, is stored in the different BANK in the DDR, comprising:
In order by each row of data of each piecemeal submatrix, a line being sequentially stored into a BANK in the DDR；
Each piecemeal submatrix in every row piecemeal submatrix is stored in the different BANK in the DDR.
In some embodiments, the first address for the BANK that every row piecemeal submatrix is stored in, is set as lastrow piecemeal
The first address of the BANK of submatrix adds 1, until the first address of the BANK of the deposit is the last one BANK, then makes next line point
The BANK first address of block submatrix is 0.
In some embodiments, the column data of burst-length is successively read from the different BANK of the DDR, and transposition is deposited
Enter in QDR, comprising:
The column data of burst-length is successively read in every row of each BANK of the DDR；
By the column data of the burst-length of the reading, transposition is stored in QDR.
According to another aspect of the present invention, a kind of data matrix transposition device for SAR imaging, the dress are provided
It sets and includes:
Blocking unit obtains piecemeal submatrix for data matrix to be carried out piecemeal according to piecemeal principle；
Data in the piecemeal submatrix are pressed the address mapping relation of the piecemeal submatrix and DDR by input unit,
It is stored in the different BANK in the DDR；
Transposition unit, for successively reading the column data of burst-length from the different BANK of the DDR, and transposition is stored in
In QDR；
Output unit is imaged for exporting the single-row data in the QDR for SAR.
In some embodiments, the piecemeal principle are as follows: the data in each piecemeal submatrix is made to fully take up DDR's
A line in BANK.
In some embodiments, the input unit includes:
Row input subelement, in order by each row of data of each piecemeal submatrix, one be sequentially stored into the DDR
A line in BANK；
BANK inputs subelement, by each piecemeal submatrix in every row piecemeal submatrix, the difference being stored in the DDR
In BANK.
In some embodiments, in BANK input subelement, the head for the BANK that every row piecemeal submatrix is stored in
Address, the first address for being set as the BANK of lastrow piecemeal submatrix add 1, until the first address of the BANK of the deposit is last
A BANK then makes the BANK first address 0 of next piecemeal submatrix.
In some embodiments, the transposition unit includes:
Reading subunit, for successively reading the column data of burst-length in every row of each BANK of DDR；
Storing sub-units, for by the column data of the burst-length of the reading, transposition to be stored in QDR.
(3) beneficial effect
It can be seen from the above technical proposal that data matrix transposition method and device that the present invention is used for SAR imaging are at least
Have the advantages that one of them or in which a part:
(1) provided by the present invention for the data matrix transposition method and device of SAR imaging, piecemeal submatrix method is utilized
It accesses to DDR memory data, so that reaching a kind of equilibrium state to the access of row data and column data in matrix, improves
Row data access efficiency utilizes three-dimensional address of cache to reduce transposition function and realizes difficulty；
(2) provided by the present invention for the data matrix transposition method and device of SAR imaging, the DDR number across BANK is utilized
According to access mode, the loss in efficiency of inter-bank access the bring line activating and precharge of row data in matrix is greatly reduced, is mentioned
High data read-write efficiency；
(3) provided by the present invention for the data matrix transposition method and device of SAR imaging, using QDR to through DDR transposition
Row data out are handled, and have been proposed high data access precision, have been avoided the waste of data, have improved the utilization rate of data；
(4) provided by the present invention for the data matrix transposition method and device of SAR imaging, the number of DDR combination QDR is utilized
According to access mode, the utilization rate of storage resource is improved.
Detailed description of the invention
Fig. 1 is the data matrix transposition method of tradition SAR imaging when carrying out DDR column operation, when BURST is 8, data square
Battle array transposition read operation process；
Fig. 2 is the flow chart provided by the present invention for the SAR data matrix transposition method being imaged；
Fig. 3 is the schematic diagram that data matrix piecemeal provided in an embodiment of the present invention is stored in DDR3 process；
Fig. 4 is BANK provided in an embodiment of the present invention when being 8, the mapping relations figure of piecemeal submatrix and BANK；
Fig. 5 is BURST provided in an embodiment of the present invention when being 8, and the column data transposition read from DDR is stored in QDR, then by
The work flow diagram of QDR transposition output；
Fig. 6 is the structural schematic diagram provided by the present invention for the SAR data matrix transposition device being imaged.
Specific embodiment
To make the objectives, technical solutions, and advantages of the present invention clearer, below in conjunction with specific embodiment, and reference
Attached drawing, the present invention is described in further detail.
According to an aspect of the invention, there is provided a kind of data matrix transposition method for SAR imaging, such as Fig. 2 institute
Show, which comprises
Data matrix is carried out piecemeal according to piecemeal principle, obtains piecemeal submatrix by S11；
Data in piecemeal submatrix are pressed piecemeal submatrix and the address mapping relation of DDR by S12, and deposit is stated in DDR
In different BANK；
S13 successively reads the column data of burst-length from the different BANK of DDR, and in transposition deposit QDR；
S14 exports the single-row data in QDR, is imaged for SAR.
Provided by the present invention for the data matrix transposition method and device of SAR imaging, piecemeal submatrix method pair is utilized
DDR memory data access, so that reaching a kind of equilibrium state to the access of row data and column data in matrix, improve
Row data access efficiency reduces transposition function using three-dimensional address of cache and realizes difficulty.
Further, the piecemeal principle are as follows: fully take up the data in each piecemeal submatrix in the BANK of DDR
A line, and the ranks number of submatrix is balanced as far as possible, it is preferred that it is a square matrix, inter-bank access times can be made minimum in this way, subtracted
The loss in efficiency of inter-bank when few transposition data access improves the efficiency of transposition data access.
In one embodiment, it is assumed that data matrix is divided into the piecemeal submatrix arranged for m row n, and m row n is arranged
Piecemeal submatrix is stored in the DDR3 of MT41K1G8 model, and the every row of the DDR3 of MT41K1G8 model has 2K storage unit, then m*n
=2048, according to above-mentioned piecemeal principle: when DDR is written in data, since data input is by data matrix a line a line
It is inputted by row, is not to be inputted in the way of piecemeal submatrix, as shown in figure 3, by the of first piecemeal submatrix A (0,0)
After a line is stored in the X row in DDR, by another row in the first row deposit DDR of second piecemeal submatrix A (0,1), until inciting somebody to action
After Y row in the data deposit DDR of the first row of A (0, N-1), then the next line piecemeal submatrix of input data matrix, so
When the second row of A (0,0) is stored in the X row of DDR, need write command to need an inter-bank operation across X row is returned from Y row, so
Piecemeal submatrix has been deposited and has needed inter-bank m times, so the column data full-time course of the A (0,0) of X row is gone out to need n times inter-bank, so working as
M=32, n=64 or n=32, when m=64, the data of piecemeal submatrix are stored in by the number of inter-bank when accessing to data
A line in DDR is minimum plus inter-bank number needed for reading piecemeal submatrix data from the row, is 32+64=96 times.If inter-bank
Number is C, for the DDR of different model, can find out m and n when making C minimum according to formula C=m+n=m+column/m
Value.
Further, step S12, comprising:
In order by each row of data of each piecemeal submatrix, a line being sequentially stored into a BANK in DDR；
Each piecemeal submatrix in every row piecemeal submatrix is stored in the different BANK in DDR.
Wherein, the first address for the BANK that every row piecemeal submatrix is stored in, is set as the BANK's of lastrow piecemeal submatrix
First address adds 1, until the first address of the BANK of deposit is the last one BANK, then makes the first ground the BANK of next line piecemeal submatrix
Location is 0.
In one embodiment, as shown in figure 4, each matrix in block form of every row piecemeal submatrix is stored in order
In the different BANK of DDR: set the N=16 in figure, BANK is 8, by the first row piecemeal submatrix row A (0,0)~A (0, N-1),
It is stored in 8 BANK by 0~7 sequence, just two circulations, A (0,0) is stored in BANK0 at this time, and A (0,1) is stored in BANK1, presses
Piecemeal submatrix is successively stored in the different BANK of DDR by this sequence, so that A (0,7) is stored in BANK8, in, A (0,16) is final
Also it is stored in BANK8；Then by the second row piecemeal submatrix row A (1,0)~A (1, N-1), 8 BANK are stored in by 0~7 sequence
In, same two circulations, at this point, A (1,0) is stored in BANK1, A (1,1) is stored in BANK2, is sequentially stored into other piecemeal submatrixs,
So that A (1,6) is stored in BANK8, A (1,7) is stored in BANK0, A (1,15) is finally made also to be stored in BANK0；According to every row piecemeal
The first address for the BANK that matrix is stored in, the first address for being set as the BANK of lastrow piecemeal submatrix adds 1, until the deposit
The first address of BANK is the last one BANK, then makes the BANK first address 0 of next line piecemeal submatrix, by the sub- square of all piecemeals
In the BANK of battle array deposit DDR.It can guarantee that the data of row submatrix can access across BANK in this way, take full advantage of
Characteristic of the DDR across BANK read-write efficiency, improves the read-write efficiency of the data to row submatrix.
Provided by the present invention for the data matrix transposition method of SAR imaging, the data access side DDR across BANK is utilized
Formula greatly reduces the loss in efficiency of inter-bank access the bring line activating and precharge of row data in matrix, improves data and read
Write efficiency.
Further, step S13, comprising:
The column data of burst-length is successively read in every row of each BANK of DDR；
By the column data of the burst-length of reading, transposition is stored in QDR.
In one embodiment, as shown in figure 5, the data that will be stored in DDR difference BANK in Fig. 3, are stored in QDR,
BURST is dropped by QDR, if the BURST that DDR reads data number is 8, then the process of QDR is read and be stored in from DDR are as follows: in DDR
Each BANK the first row in read 8 BURST data, that is, after running through the first row in first BANK, read second
The first row of a BANK, the first row length for running through all BANK in order is the data of 8 BURST, such as left data in Fig. 4
Shown, the data of reading are the data 0 to 7 of the first row in each BANK；Then by all 0 to 7 data matrix of reading
The 0 to 7 of a line data are saved as multiple row as described in intermediate data in Fig. 4 by transposition deposit QDR；Finally export the list in QDR
The single-row data of output are used for SAR imaging as shown in right data in Fig. 4 by column data；By above-mentioned reading and storage side
All data in DDR are read and are stored in QDR, and exported by QDR by method, are imaged for SAR.
Provided by the present invention for the data matrix transposition method of SAR imaging, using QDR to the line number gone out through DDR transposition
According to being handled, proposed high data access precision, avoided the waste of data, improved the utilization rate of data, and pass through by
Data access mode of the DDR in conjunction with QDR, improves the utilization rate of storage resource.
According to another aspect of the present invention, a kind of data matrix transposition device for SAR imaging is provided, such as Fig. 6 institute
Show, which includes:
Blocking unit 51 obtains piecemeal submatrix for data matrix to be carried out piecemeal according to piecemeal principle；
Input unit 52 is closed the data in the piecemeal submatrix by the address of cache of the piecemeal submatrix and DDR
System, is stored in the different BANK in the DDR；-
Transposition unit 53, for successively reading the column data of burst-length from the different BANK of the DDR, and transposition is deposited
Enter in QDR；
Output unit 54 is imaged for exporting the single-row data in the QDR for SAR.
Provided by the present invention for the data matrix transposition device of SAR imaging, DDR is stored using piecemeal submatrix method
Device data access, so that reaching a kind of equilibrium state to the access of row data and column data in matrix, improve row data
Access efficiency reduces transposition function using three-dimensional address of cache and realizes difficulty.
Further, the piecemeal principle are as follows: fully take up the data in each piecemeal submatrix in the BANK of DDR
A line.
Further, input unit 52 includes:
Row input subelement, in order by each row of data of each piecemeal submatrix, one be sequentially stored into the DDR
A line in BANK；
BANK inputs subelement, by each piecemeal submatrix in every row piecemeal submatrix, the difference being stored in the DDR
In BANK.
Further, in BANK input subelement, the first address for the BANK that every row piecemeal submatrix is stored in is set as
The first address of the BANK of a line piecemeal submatrix adds 1, until deposit BANK first address be the last one BANK, then make next
The BANK first address of a piecemeal submatrix is 0.
Provided by the present invention for the data matrix transposition device of SAR imaging, the data access side DDR across BANK is utilized
Formula greatly reduces the loss in efficiency of inter-bank access the bring line activating and precharge of row data in matrix, improves data and read
Write efficiency.
Further, transposition unit 53 includes:
Reading subunit, for successively reading the column data of burst-length in every row of each BANK of DDR；
Storing sub-units, for by the column data of the burst-length of the reading, transposition to be stored in QDR.
Provided by the present invention for the data matrix transposition device of SAR imaging, using QDR to the line number gone out through DDR transposition
According to being handled, high data access precision is proposed, the waste of data is avoided, has improved the utilization rate of data, and utilize DDR
In conjunction with the data access mode of QDR, the utilization rate of storage resource is improved.
So far, attached drawing is had been combined the present embodiment is described in detail.According to above description, those skilled in the art
There should be clear understanding to the present invention.
It should be noted that in attached drawing or specification text, the implementation for not being painted or describing is affiliated technology
Form known to a person of ordinary skill in the art, is not described in detail in field.
It should also be noted that, can provide the demonstration of the parameter comprising particular value herein, but these parameters are without definite etc.
In corresponding value, but analog value can be similar in acceptable error margin or design constraint.The side mentioned in embodiment
It is only the direction with reference to attached drawing, the protection scope being not intended to limit the invention to term.In addition, unless specifically described or must
The step of must sequentially occurring, there is no restriction for the sequences of above-mentioned steps in listed above, and can be changed according to required design or again
It is new to arrange.And above-described embodiment can be based on the considerations of design and reliability, and the collocation that is mixed with each other uses or and other embodiments
Mix and match uses, i.e., the technical characteristic in different embodiments can freely form more embodiments.
It should be noted that running through attached drawing, identical element is indicated by same or similar appended drawing reference.In the above description,
Some specific embodiments are used for description purposes only, and should not be construed to the present invention has any restrictions, and only the present invention is real
Apply the example of example.When may cause the understanding of the present invention and cause to obscure, conventional structure or construction will be omitted.It should be noted that figure
In the shape and size of each component do not reflect actual size and ratio, and only illustrate the content of the embodiment of the present invention.
Particular embodiments described above has carried out further in detail the purpose of the present invention, technical scheme and beneficial effects
It describes in detail bright, it should be understood that the above is only a specific embodiment of the present invention, is not intended to restrict the invention, it is all
Within the spirit and principles in the present invention, any modification, equivalent substitution, improvement and etc. done should be included in guarantor of the invention
Within the scope of shield.
Claims (10)
1. a kind of data matrix transposition method for SAR imaging, which is characterized in that the described method includes:
The data matrix is subjected to piecemeal according to piecemeal principle, obtains piecemeal submatrix；
The address mapping relation that data in the piecemeal submatrix are pressed to the piecemeal submatrix and DDR, is stored in the DDR
Different BANK in；
The column data of burst-length is successively read from the different BANK of the DDR, and in transposition deposit QDR；
The single-row data in the QDR are exported, are imaged for SAR.
2. the method according to claim 1, wherein the piecemeal principle are as follows: make in each piecemeal submatrix
Data fully take up a line in the BANK of DDR.
3. the method according to claim 1, wherein by the data in the piecemeal submatrix by piecemeal
The address mapping relation of matrix and DDR is stored in the different BANK in the DDR, comprising:
In order by each row of data of each piecemeal submatrix, a line being sequentially stored into a BANK in the DDR；
Each piecemeal submatrix in every row piecemeal submatrix is stored in the different BANK in the DDR.
4. according to the method described in claim 3, it is characterized in that, the first ground for the BANK that every row piecemeal submatrix is stored in
Location, the first address for being set as the BANK of lastrow piecemeal submatrix add 1, until the first address of the BANK of the deposit is the last one
BANK then makes the BANK first address 0 of next line piecemeal submatrix.
5. the method according to claim 1, wherein successively reading burst length from the different BANK of the DDR
The column data of degree, and in transposition deposit QDR, comprising:
The column data of burst-length is successively read in every row of each BANK of the DDR；
By the column data of the burst-length of the reading, transposition is stored in QDR.
6. a kind of data matrix transposition device for SAR imaging, which is characterized in that described device includes:
Blocking unit obtains piecemeal submatrix for data matrix to be carried out piecemeal according to piecemeal principle；
Data in the piecemeal submatrix are pressed the address mapping relation of the piecemeal submatrix and DDR, deposit by input unit
In different BANK in the DDR；
Transposition unit, for successively reading the column data of burst-length from the different BANK of the DDR, and transposition is stored in QDR
In；
Output unit is imaged for exporting the single-row data in the QDR for SAR.
7. device according to claim 6, which is characterized in that the piecemeal principle are as follows: make in each piecemeal submatrix
Data fully take up a line in the BANK of the DDR.
8. device according to claim 6, which is characterized in that the input unit includes:
Row input subelement, in order by each row of data of each piecemeal submatrix, a BANK being sequentially stored into the DDR
In a line；
BANK inputs subelement, by each piecemeal submatrix in every row piecemeal submatrix, the different BANK being stored in the DDR
In.
9. device according to claim 8, which is characterized in that input subelement, every row piecemeal submatrix in BANK
The first address for the BANK being stored in, the first address for being set as the BANK of lastrow piecemeal submatrix adds 1, until the BANK of the deposit
First address be the last one BANK, then make the BANK first address 0 of next piecemeal submatrix.
10. device according to claim 6, which is characterized in that the transposition unit includes:
Reading subunit, for successively reading the column data of burst-length in every row of each BANK of DDR；
Storing sub-units, for by the column data of the burst-length of the reading, transposition to be stored in QDR.
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| CN111175749A (en) * | 2020-01-19 | 2020-05-19 | 中国科学院电子学研究所 | Satellite-borne SAR imaging processing method |
| CN111625368A (en) * | 2020-05-22 | 2020-09-04 | 中国科学院空天信息创新研究院 | Distributed computing system and method and electronic equipment |
| CN112511765A (en) * | 2020-10-13 | 2021-03-16 | Oppo（重庆）智能科技有限公司 | Image rotation method, image rotation device, storage medium and electronic equipment |
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