合成孔径雷达成像中频带分割与子带处理技术研究

采用多收多发孔径的合成孔径雷达(SAR)可以获得较常规SAR更宽的测绘带和更高的空间分辨率。该文将频带分割技术应用到多收多发孔径SAR成像中，在实现方位向高分辨率的同时获得距离向高分辨率。针对同步收发的子带脉冲信号，提出了一种时域先合成再脉冲压缩的方法，并对频域子带先脉冲压缩再合成的方法进行了扩展，提出了非零中频子带脉冲压缩合成的方法，仿真结果证明了方法的有效性。文中研究了子带载频差对压缩结果及成像的影响，并通过计算机仿真分别对两种相位差的影响进行了说明。

Study on Intersection of Spectrum and Sub-band Processing Technique in Synthetic Aperture Radar Imaging

Synthetic Aperture Radar (SAR) using multiple transmit-receive apertures can obtain wider swath and higher spatial resolution. In this paper, intersection of frequency spectrum is adopted in the SAR imaging using multiple transmit-receive apertures, which can achieve high range and azimuth resolution simultaneously. As for sub-band pulses synchronously transmit-received, a method of sub-band combination in time domain prior to pulse-compression is proposed and sub-band compression prior to combining is proposed in frequency domain as a extension. The simulation result illustrates the validity of these methods. In addition, there exist some phase differences caused by the carrier frequency and their influence on pulse compression and SAR imaging is studied, the computer simulation is made to show the influence.