双星双频地面快速运动目标成像与参数估计

Ground Fast Moving Target Imaging and Parameters Estimation with Dual-Satellite/Dual-Frequency

在多输入多输出合成孔径雷达(MIMO-SAR)的基础上,提出使用双卫星、双工作频率实现地面快速运动目标检测、成像和参数估计的方法。利用广义二阶Keystone变换对提取出的运动目标进行距离徙动校正,针对快速运动目标的多普勒模糊问题,使用修正的离散调频傅立叶变换结合最小波形熵搜索完成目标多普勒参数估计后,利用数值搜索的方法对不同工作频率下的速度集合进行交集求解得到目标真实速度值,并给出了一种运算量较小的快速搜索算法。最后,计算机仿真表明了方法的有效性。

Based on the multiple-input multiple-output synthetic aperture radar, an approach with dual-satellites dual frequency for detection, imaging and parameter estimation of the ground fast moving target is proposed. General two-order Keystone transform is employed to eliminate range migration. For the Doppler ambiguity of fast moving target, modified discrete Chirp-Fourier transform and least waveform entropy search are applied to Doppler parameters estimation. The actual target velocity can be obtained by searching of different frequency data, and a fast data search method with little calculation is also presented. Finally, simulation results show the effectiveness of the method.