基于金属球的垂直指向型毫米波雷达标定

Calibration of vertical-pointing millimeter wave radar with metal sphere

垂直指向型的Ka波段毫米波雷达标定结果直接决定探测数据的准确性,影响产品在气象业务中的应用。根据雷达的特点制定标定方案,控制无人机悬停在不同的高度,使金属球处于雷达有效探测波束内,从而获取距离、反射率因子和径向速度等数据,经过分析可知,毫米波雷达距离的实测值和计算值的偏差最大为2.15 m,最小为0.1 m;水平和垂直方向上的反射率因子理论值和实测值的最大偏差分别为2.52和2.56dB,最小偏差分别为0.85和1.18dB;GPS和雷达得到的径向速度绝对偏差的最大值为0.014 m/s,最小值为0.002 m/s。参考标定结果调整雷达探测参数,从设备端减小雷达探测数据的误差。

The calibration results of vertical-pointing Ka band millimeter wave radar,which is short for MWR,directly determine the accuracy of detection data,affecting the application of the product in meteorological service.The calibration scheme is developed according to the vertical-pointing MWR features,controlling the unmanned aerial vehicles to hover at different heights.The values of distance,reflectivity factor,linear depolarization ratio and radial velocity of metal sphere in the radar beam are obtained.By analyzing the calibration data,distance deviation of MWR between the measured and calculated values is 2.15 m at most and 0.1 m at least;horizontal and vertical reflectivity factor deviation is 2.52 and 2.56 dB at most and 0.85 and 1.18 dB at least;radial velocity deviation of MWR and GPS is 0.014 m/s at most and 0.002 m/s at least.The detection parameters are adjusted according to calibration results to reduce the detection error from the radar equipment.