CN110018456A - Satellite-borne synthetic aperture radar data fast frame head inspecting method based on Matlab - Google Patents
Satellite-borne synthetic aperture radar data fast frame head inspecting method based on Matlab Download PDFInfo
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
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- G01S7/02—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S13/00
- G01S7/41—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S13/00 using analysis of echo signal for target characterisation; Target signature; Target cross-section
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Abstract
The present invention relates to a kind of satellite-borne synthetic aperture radar data fast frame head inspecting methods based on Matlab in synthetic aperture radar technique field, comprising the following steps: starting Matlab reads satellite-borne synthetic aperture radar data file；The position where the 1st identifier is searched in array；It is to extract data with reference to progress shifting function, and according to the location information after displacement with the position numerical value of the 1st identifier；Data after displacement are carried out with the retrieval of respective identifier respectively, and saves the location information of retrieval；Identical value in position result array is extracted, is as a result saved with array form, finally frame head initial position will can be obtained in the position array in result array substitution step 2.The present invention provides frame header position information to satellite-borne synthetic aperture radar integration testing and the pretreated Data Format Transform of Ground Application and subsequent processing, while also greatly improving detection efficiency and accuracy.
Description
Technical field
The present invention relates to be used for satellite-borne synthetic aperture radar data frame head detection technique field, and in particular, to Yi Zhongji
In the satellite-borne synthetic aperture radar data fast frame head inspecting method of Matlab.
Background technique
Synthetic aperture radar is a kind of works in the active remote sensing device of microwave section.It not by sunshine and weather condition etc. because
Element influences, can round-the-clock, round-the-clock earth observation imaging, thus in disaster monitoring, environment and marine monitoring, resources survey, agriculture
Agricultural output assessment, mapping and military affairs etc. have unique application advantage, have other remote sensor irreplaceable roles.
Satellite-borne synthetic aperture radar data preamble detecting generally uses C++ programming language to be developed, and is broadly divided into two kinds
Detection algorithm.First is that carrying out the retrieval of byte one by one to file data, since the 1st byte, read and identifier number phase
With byte data and compared with identifier, if do not found, i.e., since the 2nd byte, read and identifier
The data of number identical bytes are simultaneously compared with identifier, successively repeatedly；Second is that carrying out byte one by one first to file data
Retrieval, retrieved using the distance of two frame header positions as stepping after finding the position of two frame heads, such as retrieve successfully
Then continue stepping according to this to retrieve down, otherwise stops being retrieved with the stepping, be retrieved again according to byte one by one, until
New stepping is found, successively repeatedly.The precision of usual two kinds of algorithms is all very high, but 1 efficiency of algorithm is extremely low, and algorithm 2 is only in frame length
Efficiency can improve in identical or regular situation, while algorithm complexity is high.
As the requirement of the continuous development of Synthetic Aperture Radar satellite, especially high-resolution and wide covering is higher and higher,
First is that causing data volume increasing, especially high resolution synthetic aperture radar forms mass data；Second is that leading to data lattice
Formula layout becomes increasingly complex, and the difficulty of data processing is increasing, while the efficiency in order to guarantee test, needs development efficiency more
High preamble detecting method.
Through the retrieval to the prior art, application No. is 201710344355.6 Chinese invention patents to disclose based on default
Mark the satellite-borne synthetic aperture radar antenna direction picture capturing method of data.It is the following steps are included: step 1, ground single machine product
Amplitude phase error data and exemplary position that satellite-borne synthetic aperture radar antenna calibration network respectively calibrates channel are obtained when test respectively
Antenna subarray patterns；Step 2 selects the radars running parameter such as suitable bandwidth, pulsewidth, fixed in radar system list T/R test
It marks under operating mode, the transmitting/reception pulse scale signal etc. for obtaining one by one and recording each channel T/R of antenna array.But
Satellite-borne synthetic aperture radar data preamble detecting is the important ring in satellite ground test and Ground Application preprocessing process, mesh
It is preceding that there is no effective universal methods.
Summary of the invention
In view of the drawbacks of the prior art, the object of the present invention is to provide a kind of satellite-borne synthetic aperture radars based on Matlab
Data fast frame head inspecting method, detection method of the invention are based on Matlab software and command functions, are searched with numerical matrix
Form avoid loop computation, realize the quick detection of satellite-borne synthetic aperture radar data frame head, while realizing test method
Versatility, scalability and stability.
The present invention relates to a kind of satellite-borne synthetic aperture radar data fast frame head inspecting method based on Matlab, including with
Lower step:
Step 1: starting Matlab reads satellite-borne synthetic aperture radar data file in the form of 1 byte of no symbol,
Reading result is saved with array form；
Step 2: searching the position where the 1st identifier in array, and location lookup result is saved with array form；
Step 3: by where the 1st identifier positional number group difference+1 ,+2 ,+3 ... carry out shifting function, as a result with
Array form saves, and extracts data according to respective location information respectively, extracts data result and is saved respectively with array form；
Step 4: the 2nd identifier, the 3rd identifier, the 4th mark are searched in the array for extracting data result respectively
The position for knowing symbol ..., and respectively save position result with array form；
Step 5: the 2nd identifier, the 3rd identifier, the 4th identical value of identifier ... position result, knot are extracted
Fruit is saved with array form, and finally substituting into result array in step 2 can be obtained frame head in the 1st identifier-location array
Initial position numerical value.
Preferably, file data is read using Matlab in the step one, starts Matlab software, with unsigned number
The form of 1 byte reads satellite-borne synthetic aperture radar data file, and saves as the array form of 1 row N column, is named as
orig_data。
Preferably, data file is opened using " fopen " order in Matlab software in the step one, be used in combination
" fread " completes the reading of data and the preservation of array form.
Preferably, in the step two, the position of the 1st identifier is searched, calls find order to orig_data number
According to the location lookup of the 1st identifier of progress, and array is saved as, is named as pos_1.
Preferably, the step three carries out shifting function based on the position of the 1st identifier, by the 1st identifier institute
Position array pos_1 difference+1 ,+2 ,+3 ..., save as array form, be named as pos_2, pos_3, pos_4 ...,
And data are extracted from orig_data array according to respective location information respectively, array form is also saved as, orig_ is named as
data_1、orig_data_2、orig_data_3……。
Preferably, identifier is searched in the array of the step four after shifting, successively in array orig_data_1
It searches the position of the 2nd identifier, the position for searching in orig_data_2 the 3rd identifier, look into orig_data_3
The position ... of the 4th identifier is looked for, and saves as array respectively, is named as orig_data_1_pos, orig_data_2_
pos、orig_data_3_pos……。
Preferably, same position data are extracted in the step 5, and intersect order is called to extract orig_data_1_
Identical value, saves as array form in pos, orig_data_2_pos, orig_data_3_pos ... array, is named as
Orig_pos, finally substituting into orig_pos in pos_1 can be obtained frame head initial position.
Compared with prior art, the present invention have it is following the utility model has the advantages that
1, rapid detection method emphasis of the invention solves satellite-borne synthetic aperture radar integration testing and Ground Application is pre-
In treatment process the problem of preamble detecting, meets high-resolution spaceborne synthetic aperture radar mass data and frame head inspection is rapidly completed
The quick detection of any identifier may be implemented in the requirement of survey；
2, rapid detection method of the invention, to satellite-borne synthetic aperture radar integration testing and the pretreated number of Ground Application
Frame header position information is provided according to format conversion and subsequent processing, while also greatly improving detection efficiency and accuracy.
Detailed description of the invention
Upon reading the detailed description of non-limiting embodiments with reference to the following drawings, other feature of the invention,
Objects and advantages will become more apparent upon.
Fig. 1 is that the present invention is based on the satellite-borne synthetic aperture radar data fast frame head inspecting method process flows of Matlab
Figure.
Specific embodiment
The present invention is described in detail combined with specific embodiments below.Following embodiment will be helpful to the technology of this field
Personnel further understand the present invention, but the invention is not limited in any way.It should be pointed out that the ordinary skill of this field
For personnel, without departing from the inventive concept of the premise, various modifications and improvements can be made.These belong to the present invention
Protection scope.
Embodiment
In the present embodiment, the satellite-borne synthetic aperture radar data fast frame head inspecting method of the invention based on Matlab is situated between
Continue as follows: step 1: starting Matlab reads satellite-borne synthetic aperture radar data file, and reading result is saved with array form；
Step 2: searching the position where the 1st identifier in array, and location lookup result is saved with array form；
Step 3: by where the 1st identifier positional number group difference+1 ,+2 ,+3 ... carry out shifting function, as a result with
Array form saves, and extracts data according to respective location information respectively, extracts data result and is saved respectively with array form；
Step 4: the 2nd identifier, the 3rd identifier, the 4th mark are searched in extracting data result array respectively
The position of symbol ..., and respectively save position result with array form；
Step 5: as a result identical value in four position result array of extraction step is saved with array form, finally by result
Frame head initial position can be obtained in the position array that array substitutes into step 2.
Next the present invention is described in detail.
Satellite-borne synthetic aperture radar data preamble detecting is the weight in satellite ground test and Ground Application preprocessing process
A ring is wanted, is the basis of follow-up data processing, no frame head start position information is difficult to complete the conversion of data format, for working as
Preceding high resolution synthetic aperture radar satellite ground test and the pretreated demand of Ground Application and satellite-borne synthetic aperture radar
High-resolution big data quantity, the features such as data type is complicated, first is that will and matrix operation effect abundant with Matlab command functions
The high feature of rate；Second is that the highly effective algorithm of preamble detecting is developed, it is final to realize satellite-borne synthetic aperture radar data preamble detecting
High efficiency and generalization.
The object of the present invention is to provide a kind of quick preamble detecting side of satellite-borne synthetic aperture radar data based on Matlab
Method, detection method of the invention are based on Matlab software and command functions, avoid circulation from transporting in the form that numerical matrix is searched
It calculates, realizes the quick detection of satellite-borne synthetic aperture radar data frame head, while realizing the versatility of test method, scalability
And stability.
A kind of satellite-borne synthetic aperture radar data fast frame head inspecting method based on Matlab, comprising the following steps:
Step 1: starting Matlab reads satellite-borne synthetic aperture radar data file, and reading result is protected with array form
It deposits；Specially open data file using " fopen " order in Matlab software, and with " fread " complete the readings of data with
The preservation of array form；
Step 2: searching the position where the 1st identifier in array, and location lookup result is saved with array form；
" find " order is specifically called to carry out location retrieval to the 1st identifier first；
Step 3: by where the 1st identifier positional number group difference+1 ,+2 ,+3 ... carry out shifting function, as a result with
Array form saves, and extracts data according to respective location information respectively, extracts data result and is saved respectively with array form；
Step 4: the 2nd identifier, the 3rd identifier, the 4th mark are searched in extracting data result array respectively
The position of symbol ..., and respectively save position result with array form；Call " find " order to the data after displacement point
Not carry out respective identifier retrieval, and save the location information of retrieval；
Step 5: identical value in position result array is extracted, is as a result saved with array form, finally by result array generation
Entering in the position array in step 2 can be obtained frame head initial position；Call " intersect " to retrieving after displacement
Final frame head start position information can be obtained in location information extraction identical value and the position array substituted into step 2, it is complete
At preamble detecting.
Shown in the specific detection method is as follows:
1, file data is read
According to the path path of satellite-borne synthetic aperture radar data file, " fopen " and " fread " order is called respectively,
The data of reading are saved with array form, are named as original_data；
2, the 1st identifier-location information searching
" find " order is called to search the position of the 1st identifier in original_data, position result is with array shape
Formula is saved, and pos_1 is named as；
3, shifting function and data are extracted
Processing obtains new position array+1 ,+2 ,+3 on the basis of the 1st identifier-location array pos_1 ..., with number
Group form is saved, and pos_2, pos_3, pos_4 is respectively designated as ..., further according to new location information in original_
Corresponding data are extracted in data, and are saved with array form, and original_data_1, original_ are respectively designated as
data_2,original_data_3……；
4, respective identifier lookup is carried out to the data extracted after displacement
Call " find " order in original_data_1 array search the 2nd identifier location information,
The location information of the 3rd identifier is searched in original_data_2 array, the 4th is searched in original_data_3 array
The location information ... of a identifier, and being saved with array form, be respectively designated as original_data_1_pos,
original_data_2_pos,original_data_3_pos……；
5, same position information is extracted
Calling " intersect " command selection original_data_1_pos, original_data_2_pos,
Identical numerical value in original_data_3_pos ... array, and saved with array form, it is named as original_
Data_pos, then frame header position data are can be obtained into original_data_pos substitution pos_1.
In conclusion rapid detection method emphasis of the invention solves satellite-borne synthetic aperture radar integration testing and ground
It is rapidly completed using high-resolution spaceborne synthetic aperture radar mass data the problem of preamble detecting, is met in preprocessing process
The quick detection of any identifier may be implemented in the requirement of preamble detecting；Rapid detection method of the invention, to spaceborne synthesis hole
Diameter radar integration testing and the pretreated Data Format Transform of Ground Application and subsequent processing provide frame header position information, simultaneously
Also detection efficiency and accuracy are greatly improved.
Specific embodiments of the present invention are described above.It is to be appreciated that the invention is not limited to above-mentioned
Particular implementation, those skilled in the art can make a variety of changes or modify within the scope of the claims, this not shadow
Ring substantive content of the invention.In the absence of conflict, the feature in embodiments herein and embodiment can any phase
Mutually combination.
Claims (7)
1. a kind of satellite-borne synthetic aperture radar data fast frame head inspecting method based on Matlab, which is characterized in that including with
Lower step:
Step 1: starting Matlab reads satellite-borne synthetic aperture radar data file, reading in the form of 1 byte of no symbol
As a result it is saved with array form；
Step 2: searching the position where the 1st identifier in array, and location lookup result is saved with array form；
Step 3: the positional number group difference+1 ,+2 ,+3 etc. where the 1st identifier is subjected to shifting function, as a result with array shape
Formula saves, and extracts data according to respective location information respectively, extracts data result and is saved respectively with array form；
Step 4: the 2nd identifier, the 3rd identifier, the 4th identifier are searched in the array for extracting data result respectively
Deng position, and position result is saved with array form respectively；
Step 5: the identical values of position results such as the 2nd identifier, the 3rd identifier, the 4th identifier are extracted, as a result with number
Group form saves, and finally substituting into result array in step 2 can be obtained frame head start bit in the 1st identifier-location array
Setting value.
2. the satellite-borne synthetic aperture radar data fast frame head inspecting method based on Matlab as described in claim 1, special
Sign is to read file data using Matlab in the step one, starts Matlab software, with 1 byte of unsigned number
Form reads satellite-borne synthetic aperture radar data file, and saves as the array form of 1 row N column, is named as orig_data.
3. the satellite-borne synthetic aperture radar data fast frame head inspecting method based on Matlab as claimed in claim 2, special
Sign is to open data file using " fopen " order in Matlab software in the step one, and complete number with " fread "
According to reading and array form preservation.
4. the satellite-borne synthetic aperture radar data fast frame head inspecting method based on Matlab as described in claim 1, special
Sign is, in the step two, searches the position of the 1st identifier, find order is called to carry out the 1st to orig_data data
The location lookup of a identifier, and array is saved as, it is named as pos_1.
5. the satellite-borne synthetic aperture radar data fast frame head inspecting method based on Matlab as described in claim 1, special
Sign is that the step three carries out shifting function based on the position of the 1st identifier, by the positional number where the 1st identifier
Group pos_1 difference+1 ,+2 ,+3 ..., saves as array form, is named as pos_2, pos_3, pos_4 ..., and basis respectively
Respective location information extracts data from orig_data array, also saves as array form, be named as orig_data_1,
orig_data_2、orig_data_3……。
6. the satellite-borne synthetic aperture radar data fast frame head inspecting method based on Matlab as described in claim 1, special
Sign is to search identifier in the array of the step four after shifting, and the 2nd is successively searched in array orig_data_1
The 4th mark, is searched at the position that the 3rd identifier is searched in orig_data_2 in the position of identifier in orig_data_3
Know the position ... of symbol, and save as array respectively, is named as orig_data_1_pos, orig_data_2_pos, orig_
data_3_pos……。
7. the satellite-borne synthetic aperture radar data fast frame head inspecting method based on Matlab as described in claim 1, special
Sign is that same position data are extracted in the step 5, and intersect order is called to extract orig_data_1_pos, orig_
Identical value, saves as array form in data_2_pos, orig_data_3_pos ... array, is named as orig_pos, most
Orig_pos, which is substituted into pos_1, afterwards can be obtained frame head initial position.
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