合成孔径雷达回波信号线性调频特性分析

Analysis of Echo Signal Linear FM in SAR

本文从合成孔径雷达(SAR)回波信号的特点出发,对SAR回波信号的线性调频特性、频谱特性进行了详细的分析.由于SAR回波信号的线性调频特性,对方位向和距离向的SAR信号进行脉冲压缩,可实现SAR回波数据的成像.本文首先构建了二维线性调频信号,分别通过两个一维傅立叶变换实现对信号的脉冲压缩,并对压缩后的波形进行质量评估,可以得到积分旁瓣比小于-10dB的信号质量.通过这种仿真过程,实现对SAR成像算法的进一步理解.

Detailed analysis on characteristics of the linear FM＇s and spectrum of echo signal in the synthetic Aperture Radar （SAR） is made. According to its linear FM characteristic, imaging of the SAR echo data is carried out by the method of pulse-compression on SAR signal at the orientation and in its vertical direction. The authors conceive a kind of two-dimensional FM signal and do compression with two one-dimensional Fourier Transforms first, then evaluate the quality of compressed signal wave. The results show that the radio of integral sidelobe is less than-10dB. The emulation process promotes further understanding about the arithmetic of SAR＇ s imaging.