基于多核DSP的高分辨距离像运动补偿算法实现

弹载毫米波步进频率雷达能够得到目标具有较高距离分辨率的一维距离像，但当运动目标相对雷达具有径向速度时，会使回波信号产生严重的偏移与畸变，故必须进行运动速度补偿。本文首先分析了步进频率雷达高分辨距离像成像原理与目标运动速度对成像的影响，然后论述了一种基于正负调频法与最大脉组求和法的二次速度估计算法，并在TMS320C6678多核DSP平台上提出了该算法的一种并行实现方案，同时描述了该实现方案的任务分配、调度与核间通信过程。最后在多核DSP平台上对1 000帧回波信号做算法测试。测试结果表明，基于多核DSP的运动补偿算法具有较高的精度和良好的实时性。

Implementation of Motion Compensation Algorithm of HRRP Based on TMS320C6678

Missile-borne step frequency MMW radar can get high resolution range profile, but when moving target has radial velocity relative to the radar, it makes the echo signal produce serious deviation and distortion, so it is necessary to make compensation in the motion velocity. Firstly, this paper analyzes the image forming principle of missile-borne step frequency MMW radar and the effect of the target velocity on image forming, then discusses the quadratic velocity estimation algorithm, which is on the basis of the positive and negative frequency modulation method and the maximum pulse group summation method. It provides a parallel implementation scheme of the algorithm on the TMS320C6678 multi core DSP platform, and describes the implementation scheme of task allocation, scheduling and inter core communication process at the same time. Finally it carries out an algorithm test to 1 000 frames echo signal on multi-core DSP platform, whose result shows that the motion compensation algorithm has high accuracy and good real-time performance based on multicore DSP.