合成孔径激光成像雷达中非线性啁啾补偿算法的误差分析  

Error Analysis of the Nonlinear Chirp Compensation Algorithm in Synthetic Aperture Imaging Ladar

作　　者：许楠[1] 刘立人[1] 鲁伟[1] 

机构地区：[1]中国科学院上海光学精密机械研究所中国科学院空间激光通信及检验技术重点实验室,上海201800

出　　处：《光学学报》2010年第3期758-762,共5页Acta Optica Sinica

摘　　要：可调谐激光器产生的非线性啁啾相位误差会降低合成孔径激光成像雷达(SAIL)的距离向分辨率。已有的补偿算法中使用的相移公式存在估算误差,外差脉冲补偿方法也存在补偿误差。由理论推导得到适合于实际有限数据的相移公式,对理想相移公式产生估算误差的物理原因进行了分析。建立了条带扫描模式下星载SAIL的计算机仿真模型,并对两个相移公式的估算误差、整体补偿和逐一扫描滤波补偿两种方法的补偿误差进行了模拟。仿真结果验证了理论推导结论。最后,给出了减少SAIL非线性啁啾补偿算法中估算误差和补偿误差的方法。The phase errors due to the nonlinear chirp of a tunable laser reduce the range resolution in synthetic aperture imaging ladar（SAIL）.The compensating algorithm was developed.The estimation errors of the phase shifting function and the compensation errors of the traditional compensation algorithm must be eliminated.The theoretical derivation of the practical phase shifting function for finite data in practical application is established and the reason for the transfer errors of the theoretical phase shifting function is analyzed.The simulation model of the airborne SAIL working in strip map mode is established,and the simulation validates the derivation results.The method for reducing errors in the nonlinear chirp compensation algorithm is given finally.

关 键 词：合成孔径激光成像雷达 非线性啁啾 补偿算法 误差分析 距离向分辨率 

分 类 号：TN958[电子电信—信号与信息处理]