Method for preprocessing high speed platform ultra-high resolution stop and reserves (SAR) data
A technology of ultra-high resolution and data preprocessing, which is applied in the preprocessing of ultra-high-resolution SAR data on high-speed platforms, and in the field of ultra-high-resolution SAR imaging on high-speed motion platforms, which can solve the problems of low imaging accuracy and inapplicability. Achieve high resolution and eliminate image ghosting
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[0033] Reference figure 1 The preprocessing steps of the present invention for SAR data are as follows:
[0034] Step 1: Receive SAR echo data, and use the existing quadrature demodulation method to perform carrier frequency removal processing on the echo data.
[0035] Step 2. Determine whether the azimuth spectrum of the SAR echo data is aliased, when the azimuth Doppler bandwidth B a When it is greater than the azimuth sampling rate PRF, it is judged that there is azimuth spectrum aliasing in the SAR echo data, and then go to step 3, otherwise go to step 4.
[0036] Step 3. Perform azimuth defuzzification processing on the SAR echo data;
[0037] 3.1 By combining the SAR echo data with the secondary phase reference function S that varies with the frequency of the range ref Convolution to achieve no aliasing of SAR echo azimuth spectrum;
[0038] The second phase reference function expression is:
[0039] S ref = exp ( j 2 π ( vt m ) 2 R ref ...
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