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合成孔径激光雷达(SAL)受激光器件信号调制速率的制约,导致了激光调制带宽和脉冲重复频率(PRF)成为一对矛盾;同时,由于激光信号波长较短,造成波束光斑脚印较小,限制了成像场景的幅宽。基于此,本文提出了一种SAL多通道扫描工作模式下的成像方法。采用多通道体制,以空间采样弥补时间采样的不足,并采用空域滤波方法解决了多普勒模糊的问题;通过控制波束指向,使其周期性的在不同子测绘带之间扫描实现宽测绘带成像。针对扫描模式短孔径对宽场景成像易造成图像模糊的问题,采用谱分析(SPECAN)思想,将图像聚焦在方位频率域。仿真结果验证了本文算法的有效性。
Synthetic aperture laser radar (SAL) by laser device signal modulation rate constraints, resulting in the laser modulation bandwidth and pulse repetition frequency (PRF) as a contradiction; the same time, due to shorter laser wavelength, resulting in smaller beam spot footprints, restrictions The width of the imaging scene. Based on this, this paper presents a multi-channel SAL scanning mode of imaging method. Multi-channel system is adopted to make up for the shortage of time sampling by spatial sampling and spatial filtering to solve the problem of Doppler ambiguity. By controlling the beam direction, it can be scanned cyclically among different sub-bands to achieve wide swath Imaging. Aiming at the problem of image blur caused by short aperture scanning mode and wide scene imaging, spectral analysis (SPECAN) is adopted to focus the image in the azimuth frequency domain. The simulation results verify the effectiveness of the proposed algorithm.