基于GPU加速的双基地SAR回波快速仿真方法

摘要

针对双基地SAR实测数据缺乏、传统时域回波仿真方法耗时较长的现状,提出了一种基于GPU加速的双基地SAR回波仿真方法.将散射点及其对应的幅度、相位信息沿着收发平台的等斜距线进行累加,然后与发射信号相卷积得到回波信号.在计算过程中采用GPU提高运算速度,并给出其中关键部分计算阵列化的实现.仿真结果表明,改进方法在回波仿真速度上与传统时域仿真方法相比有大幅提升,仿真回波满足成像要求,具有较高的实用价值.%To deal with the lack of practical data and the high time-consuming of the traditional method,this paper introduces a bistatic synthetic aperture radar (SAR) echo simulation method based on graphic processing unit (GPU) acceleration.Scatterers' corresponding amplitudes and phase are added along the equal slant line,then convoluted with transmit signals.The computation is carried out in the form of array,and GPU is used to further increase the speed.The simulation results show that the proposed method can not only accelerate the simulation speed dramatically compared with traditional method,but also satisfy the image requirement.