斜视模式下基于Legendre展开的改进CS成像算法  

Improved CS algorithm based on Legendre deployment in squint mode

作　　者：万智龙[1] 谢亚楠[1] 郑和[1] 刘文渊[1] 

机构地区：[1]上海大学特种光纤与光接入网省部共建重点实验室,上海200072

出　　处：《计算机应用研究》2012年第6期2339-2341,2349,共4页Application Research of Computers

基　　金：国家自然科学基金资助项目(61071185);上海市重点学科和科委重点实验室资助项目(S30108;08DZ2231100);上海市科委科技攻关计划资助项目(10511501702)

摘　　要：在SAR的斜视模式下,针对传统的CS成像算法相位展开精度差的缺点,提出一种改进算法将Legendre展开应用其中。传统的成像算法主要对回波信号的二维频域的传递函数,还有算法流程中的三个相位校正函数应用Taylor多项式进行展开。将Legendre多项式取代Taylor多项式对算法进行处理,并进行了详细的推导,与传统的基于Taylor多项式进行展开的成像算法相比,减少了回波相位近似误差,相位展开精度得到了提高。最后从峰值旁瓣比和积分旁瓣比的角度评估了SAR图像的成像质量。理论推导和仿真结果都表明成像质量得到了进一步的提高。In the squint mode of the SAR,in allusion to the traditional CS imaging algorithm＇s shortcoming of poor unwrapping precision,this paper presented an improved algorithm with application of Legendre polynomial.The traditional imaging algorithm mainly adopted Taylor polynomial to deploy the transfer function of the echo signal in 2-dimensional frequency domain and 3 phase correction in the algorithm flow.Taylor polynomial would be replaced by Legendre polynomial to process the algorithm and deduced in detail.Compared with the traditional imaging algorithm based on Taylor polynomial,it could reduce the approximation error of echo phase,improved unwrapping precision.Finally,it estimated the image quality of SAR image by PSLR and ISLR.The theoretical deduction and simulation results show that the image quality has been further improved.

关 键 词：合成孔径雷达 时域距离徙动校正 LEGENDRE多项式 CS成像算法 

分 类 号：N957.52[自然科学总论]