高分辨距离像循环相关复合精确测速方法

摘要

To solve the distortion of high resolution range profile (HRRP) due to target's motion for step frequency signal, a positive-negative-positive style step frequency waveform is designed which is separated into groups constituted of two positive pulse trains and one negative pulse train. A corresponding velocity precise measurement method using combination of circular correlation of HRRP is presented, and the final precise velocity estimated value is identified by combining coarse velocity estimated value and precise velocity estimated value. The simulation results indicate that this method can achieve a very high precision with little computation and has good anti-noise and anti-motility performance. This method is especially applicable to the system requiring high speed signal processing.%为解决目标径向速度对步进频率信号高分辨距离像的影响,以精确速度补偿为目的,设计了一种正负正步进跳频波形,以两帧正跳频脉冲序列和一帧负跳频脉冲序列作为一测速组.提出了一种高分辨距离像循环相关复合精确测速方法,通过粗细估值的复合得出速度精确估计值,并用于下一组脉冲序列的速度补偿.仿真结果表明该方法测速精度高,具有良好的抗噪声性能和抗目标机动性能,且运算量较小,适用于实时性要求较高的信号处理系统.