合成孔径激光成像雷达距离向等延时的信号处理结构和算法  

Signal Processing Construction and Algorithm of Range Equal Delay in SAIL

作　　者：许楠[1,2] 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 [2]中国科学院研究生院,北京100039

出　　处：《电子学报》2010年第6期1405-1409,共5页Acta Electronica Sinica

摘　　要：合成孔径激光成像雷达中啁啾激光光源的非线性会严重降低距离向成像分辨率.国外已发展了建立参考通道的非线性啁啾补偿算法.本文证明了等延时抑制非线性啁啾和非同步触发初始相位误差的原理,提出了一种具有三种本振延时产生方案的接收信号处理结构及算法体系,包含:建立等臂目标本振通道,建立参考通道及两次外差变频、建立参考通道及相移计算.建立了该算法的一般性数学流程,以星载合成孔径激光成像雷达为模型进行了计算机仿真,验证了算法的可行性.最后对三种方法的优缺点进行了讨论.The nonlinear chirp of laser reduces the range resolution of synthetic aperture imaging ladar.The compensating algorithms by establishing reference path are developed.An equal delay theory to compensate nonlinear chirp phase errors and asynchronous trigged phase errors is proposed,including three methods：establishing matched target LO path,establishing reference path and twice coherent detection,establishing reference path and phase shifting calculation.The mathematical flow of the algorithm is established.The simulation of the airborne synthetic aperture imaging ladar model validates the feasibility.The characteristics of three methods are discussed finally.

关 键 词：合成孔径激光成像雷达 等延时 非线性啁啾 距离向分辨率 

分 类 号：TN958[电子电信—信号与信息处理]