基于干涉处理的机载合成孔径激光雷达振动估计和成像

实际飞行过程中载机的俯仰角和偏航角会在顺轨干涉处理的基线中引入交轨基线分量，在振动条件下对高程起伏地形难以精确成像。为实现机载合成孔径激光雷达(SAL)振动有效估计，提出了一种基于三探测器正交基线干涉处理的振动估计和成像处理方法，建立了信号模型并进行了精度分析。该方法需要使视场重叠，并利用了SAL非成像光学系统的特点来实现。介绍了利用一个对地宽幅成像探测器和三个振动估计探测器分置的光学系统实现方案，并讨论了探测器视场重叠度和信噪比对振动估计性能的影响。振动条件下对高程起伏地形的仿真成像结果验证了该方法的有效性。

Abstract

The cross-track baseline component of the along-track interferometry processing baseline is introduced by the angle of pitch and yaw in the actual flight, and the accurate imaging of elevation fluctuation terrain is difficult to obtain under the condition of vibration. In order to realize vibration estimation in airborne synthetic aperture ladar (SAL) effectively, a kind of vibration estimation and imaging method is proposed based on interferometry processing of three detectors with orthogonal baselines, and the signal model is established and its accuracy is analyzed. This method need to make the field of view overlap, and it is realized by the characteristic of SAL non-imaging optical system. The optical system containing a wide swath ground imaging detector and three vibration estimating detectors is introduced. The impact of overlapped degree of field of view of detectors and signal-to-noise ratio on performance of vibration estimation are discussed respectively. The imaging simulation results of the elevation fluctuation terrain under platform vibration condition validate the effectiveness of the proposed method.

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杜剑波, 李道京, 马萌, 胡烜, 乔明. 基于干涉处理的机载合成孔径激光雷达振动估计和成像[J]. 中国激光, 2016, 43(9): 0910003. Du Jianbo, Li Daojing, Ma Meng, Hu Xuan, Qiao Ming. Vibration Estimation and Imaging of Airborne Synthetic Aperture Ladar Based on Interferometry Processing[J]. Chinese Journal of Lasers, 2016, 43(9): 0910003.

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