SAR信号在距离多普勒域和二维频域中的频谱分析

合成孔径雷达的回波信号是SAR成像等一系列处理的基础，通过对SAR信号频谱的分析有利于脉冲压缩即匹配滤波器的设计，SAR信号频谱是目前较为精确高效的成像算法如RDA、wKA、CSA的理论基础。通过对频谱的分析有利于SAR成像中距离徙动、多普勒模糊等问题的解决。重点分析、详细推导了SAR信号在距离多普勒域及二维频域中的频谱表达式，深刻理解傅里叶变换的本质作用；最后利用Matlab对单个点目标分别在零斜视角、非零斜视角下的接收信号特性进行仿真，理论和实验分析SAR信号在这两种域的频谱性能。

Analysis of the frequency spectrum of SAR in the range doppler domain and two dimensional frequency domain

Synthetic aperture radar echo signal is the foundation of SAR imaging and other processes, the analysis of SAR signal spectrum is helpful to the design of the pulse compression that is to say the design of the matched filter,the SAR signal spectrum is the theoretical basis of some accurate and efficient imaging algorithm, such as RDA,wKA,CSA.Through the analysis of the spectrum,some problems like range cell migration,doppler ambiguity in SAR imaging will be solved more easily.This essay focuses on the analysis and derivation of the SAR signal in the range doppler domain and two dimensional frequency domain to get the spectrum expressionand profoundly understand the essence of the Fourier transform; Finally, by Matlabsimulating the characteristicsof the receivedsignalonasingle point target under zero squint angle and non zero angle respectively,analysing the characteristics of SAR signal spectrum properties in these two domains theoretically and experimentally.