摘要
空间目标的逆合成孔径雷达(ISAR)图像包含丰富的信息,但是当雷达波束中包含多个运动目标且目标在距离维无法分辨时,很难得到多目标ISAR图像。通过对回波信号的分析,建立了宽带线性调频雷达信号的近地轨道多目标ISAR成像模型。在分析了空间目标的高速运动对多目标成像的影响后,提出了用高阶模糊度函数积进行多分量多项式相位信号参数估计的方法。利用估计的参数进行回波分离、速度补偿,消除目标高速运动对多目标成像的影响。最后通过仿真验证了分析结果的正确和算法的有效,并提出了近地轨道多目标成像的一般方法。
ISAR image for space objects contains an abundant information, however, it is difficult to obtain ISAR image for multiple objects, when multiple targets are flying in the same antenna beam and can not be separated in range. A signal model is studied. A model of echo for near - earth orbit multi - targets from wideband linear frequency modulated radar signal is given. The effect of space object＇ s hypervelocity on multi - targets ISAR imaging is analyzed. A feasible method of parameter estimation of multi - component polynomial phase signal is proposed by using PHAF（ product high- order ambiguity function） . Echo separation and motion compensation are done with the estimated values. The effect of space object＇ s hypervelocity on multi - target ISAR imaging is removed. Finally, simulation result shows that the analysis is correct and the method is effective, and a general method of ISAR imaging for near- earth multi -targets is proposed.
出处
《计算机仿真》
CSCD
2008年第11期211-213,273,共4页
Computer Simulation
基金
国家863高技术项目资助(2007AA703421)
新世纪优秀人才支持计划资助
