中文摘要：

针对机载冰川厚度探测雷达传统成像方法计算量大的问题,提出了一种适用于两层传播媒质的正下视波数域（RM A）成像算法。该算法能自动补偿电磁波的折射效应,校正不同媒质中电磁波传播速度的变化。基于空间几何模型和回波信号形式,推导了雷达回波信号的二维频谱,并在此基础上给出了成像算法实现步骤及相位补偿因子,分析了运动误差的影响及其补偿方法。最后通过仿真分析验证了该算法的有效性。

英文摘要：

Based on the problem that the traditional imaging method for air borne glacier penetrating radar is time consuming,a nadir-looking range migration imaging algorithm（RMA） for two mediums is studied.The algorithm can automatically compensate the refraction of the electromagnetic wave and the propagation velocity changes in different mediums.According to the spatial geometry and the model of echo signal,the 2-D spectrum of the radar echo is proposed and the realized steps of algorithm and phase compensation factors are given.The effect of motion errors and the compensating way are presented.The imaging quality of simulation results is consistent with the theoretical value and the validity of the algorithm is demonstrated.