基于模糊函数-雷顿变换的SAR运动目标成像

该文从一个新的角度赋予模糊函数以新的用途.近似为线性调频信号的SAR运动目标回波信号的模糊度函数在模糊平面内具有很高的能量集中性.联合雷顿变换可以求出线性调频信号的调频率.在此基础上本文提出了基于模糊函数-雷顿变换的SAR运动目标成像算法,计算机仿真结果验证了算法的可行性.

SAR MOVING TARGETS IMAGING BASED ON COMBINED AMBIGUITY FUNCTION AND RADON TRANSFORM

A new application of the ambiguity function is given in this paper to resolve the problem of moving targets imaging of SAR. It is well known that the SAR echo can be considered as a linear FM signal, so does the echo of moving targets. The square modulus of linear FM signal has high energy centrality in the ambiguity domain. Its peaks represent straight lines whose slopes equal to the Doppler rates of the moving targets echo signals. The parameters of moving targets can be estimated by applying the Radon transform to the ambiguity function. In this way, the moving targets can be easily detected and imaged. The simulation results prove the effectiveness and feasibility of this new method.