方位多波束SAR系统中天线长度和PRF选择分析

Determination of Antenna Length and Pulse Repetition Frequency in Multiple Azimuth Beam Synthetic Aperture Radar System

基于方位多波束合成孔径雷达可以同时实现方位高分辨率和宽测绘带 ,首先简要介绍了方位多波束SAR的基本原理 ,然后详细分析了该系统的方位分辨率与天线长度及脉冲重复频率 (PRF)之间关系。通过与单波束系统对比 ,揭示了方位多波束技术在同时获得高分辨率、宽测绘带方面的优势 ,并探讨了不同分辨率时 ,天线长度、脉冲重复频率选择情况 ,以资工程设计考虑。最后 。

Multiple azimuth beam synthetic aperture radar (SAR) allows realization of ”simultaneous wide-swath and high-resolution SAR imagery” by using ”a combination of low pulse repetition frequency (PRF) and multiple azimuth beams to provide a high Doppler sampling rate needed for high azimuth resolution imaging”. In this paper, first the principle of the multi-beam SAR is described briefly. Then the relationship between azimuth resolution, antenna length and PRF are analyzed in detail. By contrasting with the single-beam SAR, the advantages of multi-beam technique are explained. Considering the engineering requirements, the determinations of antenna length and PRF are discussed for different azimuth resolution. The problem about the system to be considered further is addressed at last.