合成孔径激光雷达(SAL)是遥感领域的研究热点.振动是SAL系统中较为突出的问题.根据之前的研究结果,SAL对垂直航向的线振动比较敏感.为了抑制振动带来的相位误差,根据差分合成孔径雷达(DSAL)实现振动抑制的原理,提出了在距离向上交错放置的两个接收镜头实现差分接收的方案,从原理上分析了这种交错结构的DSAL系统对线振动和角振动的抑制能力,并分析了角振动对抑制效果的影响.采用实测的POS数据对抑制能力进行仿真可以看到,这种交错结构对线振动和角振动有较好的抑制效果.该结论为在工程中实现SAL成像的振动抑制提供了理论基础和系统选择方案.

Synthetic Aperture Ladar(SAL) is the focus of remote sensing research in recent years with vibration as an important issue in this system. According to the research before, SAL is sensitive to the cross-trace line vibration. In order to eliminate the phase error brought by vibration, the staggered structure of two sub-apertures along range direction was proposed according to the principle of differential synthetic aperture ladar (DSAL). Using the measured POS data, the ability of eliminating the effect of line vibration of this staggered structure was analyzed in principle. Analysis was also made about the effect of angle vibration on this structure. The results show that the structure can eliminate the effect of line vibration as well as angle vibration. The results provide theoretical foundation and system choice for vibration elimination in SAL imaging in practice.