Polarimetric calibration technique based on natural distribution scenes and rare calibrator
A calibrator and calibration technology, which is applied to instruments, radio wave measurement systems, etc., can solve the problem of difficulty in obtaining distributed targets, and achieve the effect of enhancing applicability and robustness
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[0080] Combine below Figure 1-Figure 24 The present invention is further described.
[0081] Experiment 1: X-band polarimetric SAR data on January 31, 2010
[0082] Using the X-band airborne polarimetric SAR data obtained by the 38th Institute of China Electronics Group in a certain place in Hainan, China on January 31, 2010, the image size is 7601*4901 pixels, figure 2 is the original HH polarization channel SAR image of the region.
[0083]First, according to Step I and Step II, the crosstalk factor is solved by using the information of the data itself in the imaging scene. After the crosstalk factor is calculated, the observed polarimetric SAR data can be compensated for the crosstalk factor to realize the polarization crosstalk determination of the data. mark. image 3 and Figure 4 The crosstalk degrees before and after polarization calibration of the experiment 1 data are given. The crosstalk items of the data before calibration are -18.79dB, -21.19dB, -18.78dB, -2...
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