一种频率步进雷达目标径向速度估计方法

为补偿目标径向速度对频率步进雷达合成距离像的影响,提出了一种目标径向速度估计方法.经公式推导证明频率步进雷达相邻两个脉组回波的归一化采样序列的互相关函数是一复正弦序列,该序列的频率与目标径向速度有确定的对应关系.通过快速傅里叶变换(FFT,Fast Fourier Transform)可获得序列频率,从而估计出目标径向速度.该方法可估计的速度范围仅取决于系统带宽和脉冲重复周期,并且由于理论估计精度可通过FFT点数调整,在需要非常高估计精度的场合可以大幅降低计算量.计算机仿真结果表明该方法对目标径向速度估计准确,同时具有较好的抗噪声性能.

New estimation method of target’s radial velocity for stepped-frequency radar

A new radial velocity estimation method was presented to compensate the effects of the target's radial velocity on range profiles synthesized from a stepped-frequency radar.Theoretical analysis indicates that the correlation function derived from two sequential bursts' normalized complex samples of a stepped-frequency radar is a complex sinusoidal sequence,and the sequence's frequency is related to the target's radial velocity.So the target's radial velocity can be estimated with the sequence's frequency calculated by fast Fourier transform(FFT) algorithm.The estimable velocity range of this method is applicable depends only on the system bandwidth and the pulse repetition period.As the theoretical estimation resolution is determined by the point number of FFT,computational cost can be saved in the case of high estimation resolution is required.Simulation results show that this method can estimate the target's radial velocity accurately with good anti-noise performance.