合成孔径成像激光雷达成像算法研究

Synthetic Aperture Imaging Ladar Imaging Algorithm

在描述了调频连续波信号模型以及其外差接收体制特点的基础上,针对传统合成孔径雷达的"一步一停"模型中忽略的平台连续运动引入的多普勒频移项,采用线性调频连续波信号的合成孔径成像激光雷达瞬时距离较传统合成孔径雷达的改变.推导出在该模型下一种适用于机载合成孔径成像激光雷达系统的频率变标算法,一并考虑了在连续波信号模型中多普勒频移项对成像的影响.仿真证明了该算法能有效补偿平台连续运动带来的影响.

FMCW signal and its characteristic in balanced heterodyne detecting were described. The difference in instantaneous slant range between SAIL and conventional SAR were analyzed. A Doppler shift term was induced by the continuous motion of the platform that was ignored by conventional SAR in ＂stop- and-go＂ model. A refined frequency scaling algorithm was deduced,which was suitable for airborne SAIL in stripmap model and was taking the Doppler shift term into account. The simulation result shows that the given algorithm can compensate for the effect of the continuous motion of the platform efficiently.