Improved CS algorithm based on Legendre deployment in squint mode
斜视模式下基于Legendre展开的改进CS成像算法

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.