一种连续波雷达高精度波束中心速度求取方法

解决着陆导航连续波测速雷达中面目标非均匀散射特性和加速度分量对测速精度的影响，提出了一种高精度波束中心速度求取方法。采用Kalman滤波完成速度跟踪和加速度估计，进行加速度补偿后，利用ZFFT变换完成对目标多普勒频移范围的细化分析，最后采用包络截取法完成高精度波束中心速度估计。通过仿真分析证明，包络截取法相比其他方法具有精度高、适应性强的特点，速度测量误差小于0.15m/s（3δ）；通过硬件系统处理时间分析，该算法流程易于实时处理，已成功应用于某着陆导航雷达系统中。

A high-accuracy measuring method of beam center velocity in continuous wave radar

For solving the influence of the heterogeneous scattering features of area target and the acceleration in velocity measuring of CW radar for landing navigation，a high-accuracy beam center velocity measuring method was presented.Kalman filter was used for velocity tracking and acceleration compensation after acceleration estimating.ZFFT transform was used for spectrum zoom of target Doppler range.Finally the envelope method was presented for high-precision estimating of beam center velocity.The simulation results verify that the envelope method can obtain higher estimating precision and adaptation than other methods，the standard deviation（3δ）of velocity measuring error is less than 0.15m/s.The process time analysis results of hardware system verify that the algorithm procedure is suitable for real-time processing，and has been successfully used in certain landing navigation radar system.