收稿日期: 2008-10-22
修回日期: 2009-03-13
网络出版日期: 2009-07-15
Space-borne SAR data processing based on intermediate frequency sampling
Received date: 2008-10-22
Revised date: 2009-03-13
Online published: 2009-07-15
袁静 , 梁淮宁 , 李早社 , 禹卫东 . 基于中频采样的星载合成孔径雷达的数据处理[J]. 中国科学院大学学报, 2009 , 26(4) : 497 -502 . DOI: 10.7523/j.issn.2095-6134.2009.4.010
We studied the scheme of space-borne synthetic aperture RADAR(SAR) data processing based on intermediate frequency sampling and the implementation method on FPGA. For a traditional space-borne SAR system, the video signal is first demodulated usually by analog method, and then sampled and compressed. This paper employs the intermediate frequency sampling technique to realize the quadrature demodulation and processing of space-borne SAR data. We analyzed the digital quadrature demodulation and the block adaptive quantization algorithms, and accomplished the FPGA design and simulation. The results show that the design scheme is feasible. Compared with the analog method, the employment of intermediate frequency sampling has improved the reliability and performance of the system, and it presents the trend of SAR data processing.
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