毫米波捷变频体制下低空风切变风速估计方法

机载气象雷达下视探测低空风切变时,复杂的电磁干扰及强地杂波会严重影响其对目标信号的检测,造成风场速度估计失准.针对上述问题,本文提出一种毫米波(millimeter wave,MMW)捷变频体制下的低空风切变风速估计方法.该方法采用载频脉组间捷变,在每个脉组内利用雷达系统先验信息设计两维两脉冲对消(two di-men...

Wind speed estimation of low-altitude wind-shear under MMW frequency agile system

Complex electromagnetic interference and strong ground clutter will seriously affect the detection of the target signal when airborne weather radar is used to detect the low-altitude wind-shear, resulting in the inaccurate estimation of wind speed. To solve these problems, this paper presents a method of wind speed estimation of low-altitude wind-shear in MMW (millimeter wave) frequency agile system. In this method, two dimensional pulse-to-pulse canceller (TDPC) prefilter is designed in each pulse group by using radar system prior information to prefilter radar echo and weaken clutter power. Then, the combined space-time main channel adaptive processing(CMCAP) is used to filter the echo data in two dimensional space-time,obtains the Doppler ambiguity estimation value of the wind-shear signal, finally transforms the estimation result in each pulse group from the Doppler frequency domain to the velocity domain, uses the dislocation difference table method to revise the speed ambiguity, thus obtains the real speed value of the wind field. The simulation results show the effectiveness of the proposed method.