Space-borne SAR data processing based on intermediate frequency sampling

doi:10.7523/j.issn.2095-6134.2009.4.010

›› 2009, Vol. 26 ›› Issue (4): 497-502.DOI: 10.7523/j.issn.2095-6134.2009.4.010

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Space-borne SAR data processing based on intermediate frequency sampling

YUAN Jing^1,2, LIANG Huai-Ning¹, LI Zao-She¹, YU Wei-Dong¹

1. Institute of Electronics, Chinese Academy of Sciences, Beijing 100190, China;
2. Graduate University of the Chinese Academy of Sciences, Beijing 100049, China

Received:2008-10-22 Revised:2009-03-13 Online:2009-07-15

Abstract

Abstract:

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.

Key words: synthetic aperture RADAR(SAR), intermediate frequency sampling, field programmable gate array(FPGA), digital quadrature demodulation, block adaptive quantization(BAQ)

CLC Number:

TN957

YUAN Jing, LIANG Huai-Ning, LI Zao-She, YU Wei-Dong. Space-borne SAR data processing based on intermediate frequency sampling[J]. , 2009, 26(4): 497-502.

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Space-borne SAR data processing based on intermediate frequency sampling

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