调频步进雷达的目标速度估计方法

Velocity estimation method for moving target of frequency-modulated stepping radar

针对调频步进雷达目标运动对合成距离像的影响,提出了一种快速的速度估计方法。根据调频步进雷达运动目标的回波特性,首先对压缩后的子脉冲进行包络平移。然后将前后两帧中同一频率的信号进行相关处理,对消相位项中距离信息及距离和速度交叉信息,只保留速度信息。再通过快速傅里叶变换处理,完成速度的快速估计。最后利用估计的速度对回波进行补偿,得到了清晰的一维距离像。仿真结果证明了该方法的有效性。

Aiming at the influence of the target movement acquired by the frequency modulated stepping radar on composite range profiles, a fast velocity estimation method is proposed. According to the moving target＇s echo characteristics acquired by the frequency modulated stepping radar, the envelope migration is firstly carried out for the subset of the compressed pulse. By the correlation processing of signals with the same frequency located in both front and back frames, the range terms and the cross terms of both range and velocity are eliminated, but only the velocity terms are remained. Then a fast estimation of the velocity is come out by a FFT transform. Finally, the echo is compensated in terms of the estimated velocity value, and then a clear one dimensional range profile is achieved. Simulation results prove the feasibility of the proposed method.