多发多收Scan模式实现高分辨宽测绘带SAR成像

摘要

To deal with the contradiction between high resolution and wide swath in spaceborne synthetic aperture radar (SAR) imaging, an imaging algorithm based on multiple input multiple output (MIMO) and Scan mode is proposed. The wide swath in range direction is achieved by controlling the beam footprint scanning in several sub-swaths periodically. Meanwhile, in order to compensate the degraded of azimuth resolution inherent in scan mode, this paper applies the beamforming method based on multiple receive antennas to implement Doppler ambiguity removal in the condition of low pulse repetition frequency (PRF) sampling. In addition, the high resolution in range direcion is obtained with multiple antennas transmitting signals with different center frequencies and bandwidth synthesizing technique. Finally, the feasible system parameters are designed, and the corresponding simulation results confirm the validity of the method.%针对传统星栽合成孔径雷达(synthetic aperture radar,SAR)高分辨与宽测绘带成像之间的矛盾,提出基于多发多收扫描模式的SAR成像方法.该方法通过控制波束指向,使其在距离向多个子测绘带间周期性照射,进而得到距离向宽测绘带.同时,为了保证方位向分辨率,利用多天线接收和波束形成实现低方位重复频率下的多普勒模糊信号重构.另外,利用多个发射天线发射不同载频信号及频带合成技术获得距离向高分辨率.最后,应用参数设计结合仿真数据实验验证了该方法的有效性.