利用太阳法自动标定L波段探空雷达天线指向

Automatic Calibration of Radar Antenna Pointing in L-Band Radar by Using Solar Method

L波段探空雷达方位、仰角的标定通常借助北极星和经纬仪来完成,对其正确性缺乏可靠有效的检验工具,本文利用高精度的太阳位置算法,采用Python语言进行程序设计和封装,根据台站实际经纬度、太阳赤纬角和时差,从理论上计算出太阳实时位置去标定雷达天线指向,并在多个台站进行了测试和偏差分析,其精度为≤0.3°,参考国内新一代天气雷达天线波束指向定标技术指标(≤0.3°),其精度达到相关业务要求。同时,该算法软件还能为探空员日常检查雷达性能,判断雷达有无故障提供更为快捷的手段,确保探空资料的可靠性。

The azimuth and elevation calibration of L-band radar are usually conducted by Polaris and theodolites;however,there is lack of reliable and effective tools to test its correctness.This paper adopts the solar position algorithm with a high degree of accuracy,uses the Python language program to design and package.According to the actual latitude and longitude,solar declination angle,and the time difference of the station,the sun position is calculated in real time to calibrate the radar antenna pointing in theory.The test and tolerance analysis are carried out in several stations,and the accuracy is within 0.3 degrees,referring to the domestic new generation weather radar antenna beam pointing calibration specifications（≤0.3 degrees）.The accuracy meets the operation requirements.At the same time,the algorithm software can also provide a more efficient way to check the daily radar performance and check whether there are troubles in radar,so to ensure the reliability of sounding data.