合成孔径雷达系统建模、仿真与信号处理初探

作为雷达技术发展历史中的里程碑,合成孔径雷达(SAR)通过使用空中合成天线阵列技术及先进的目标回波信号处理技术能够提供清晰的地球表面图像。由于它的这一突出特点,SAR已经成为许多飞行器的重要任务载荷并被广泛应用于军事及民用领域。从航空电子系统总体需求角度出发,为了深刻理解SAR系统的工作原理并得到更好的SAR图像产品,有必要对系统数学模型的建立、SAR回波信号的仿真以及信号处理算法进行深入的研究。本文试图从这三方面讨论SAR系统设计中的关键问题。

Primary Exploration for Modeling、Simulation and Signal Processing of SAR System

As a milestone of the history of radar technology development,synthetic aperture radar (SAR) can provide detailed information of ground surface by processing echo signals of a moving radar transmitter,which forms a large synthetic aperture antenna array in the space.Due to its valuable properties,in particular,being one of main mission payloads in air vehicles,SAR is widely used in both military and civil applications.In order to deeply understand from an avionics point of view the working principle of SAR system and hence to produce better SAR images,a comprehensive study of SAR system modeling,raw signal simulation and signal processing algorithm is both critical and necessary.In this paper,we try to discuss these key aspects of SAR technology.