利用优化算法对合成孔径激光雷达相位误差补偿的研究

摘要

In the field of remote sensing,the platform vibration is one of the important problems of synthetic aperture ladar (SAL).There is no efficient method in compensating the platform vibration of SAL currently.The platform vibration effects the phase of the received data.By analyzing the mechanism of platform vibration,the phase error caused by platform vibration can be described by polynomial function.The vibration is compensated by optimization algorithm which optimizes the polynomial coeffi-cients based on this conversion model.In optimization process,proper object function is needed and the phase of received data is compensated by optimization result,then the compensated data is compressed by matched filter.By simulation and experimental result,the conclusion is the better result of compression can be achieved after compensate the phase error by using the optimization algorithm.The research has offered candidate technology to platform vibration compensation.%在遥感领域，平台振动是合成孔径激光雷达（SAL）研究中的一个重要问题。目前尚没有针对SAL的平台振动补偿方法。根据对振动机理分析，平台振动的影响体现在相位误差上。根据对振动机理的分析，可以利用多项式描述平台振动带来的相位误差。基于这一转化模型利用优化算法对多项式系数进行优化求解可以达到补偿效果。优化过程需要选取合适的目标函数，用优化后的求解结果补偿回波数据相位，补偿结果再用匹配滤波器进行压缩。通过仿真和实验证明，用优化算法实现相位误差补偿可以达到很好的压缩效果。研究工作为平台振动补偿技术提供了一项选择。