The rearch of the CS algorithm in SA-BiSAR

Paper number

IAC-11,B1,4,10,x11672

Author

Mrs. Sun Zheng, University of electronic science and technology of China, China

Year

2011

Abstract

Spaceborne-Airborne Bistatic SAR (SA-BiSAR), has demonstrated some unique advantages and has great application space as a new Bistatic SAR. However ，the transmitted system and received system have great differences ,so the research  of  imaging algorithm has encountered many difficulties on account of azimuth-variant. 
	The CS algorithm of Bistatic SAR is computed on the basis of the mono-static SAR in this paper. The algorithm solved two difficulties: first, the range function is complex in range-Doppler domain, which is not linear with the range variable .So it is hard to get the CS function. Second, the problem of azimuth-variant makes the frequency remove. So the image will not focalize if the correct of Doppler parameter according to the reference target.
	The solution for the first problem is Taylor second order expansion in the transmitted range of reference target.          
	The crucial approach is computing the correct Doppler center frequency for the second problem. Considering the Doppler parameter is mainly affected by transmitted system, so the compute of Doppler center frequency is different from the general method in this paper. The range history is derivative in the time of between the transmitted system and target. Then the frequency of azimuth domain is removed with Doppler center frequency. After this step, the azimuth-variant is removed and the image will focalize correctly.
	The general CS algorithm introduced a phase function, which makes the Doppler frequency equality in the same range cell. However, this algorithm has a condition which is the range migration are equality for all the targets. But the algorithm has not that condition in this paper.

Abstract document

IAC-11,B1,4,10,x11672.brief.pdf

Manuscript document

(absent)