回波强度测量的误差因素分析及解决方法

Error Analysis and Correction Methods on Observations of Echo Intensity

回波强度测量误差主要由雷达本身的参数(如发射功率、波束宽度、天线增益、系统损耗等)、气象因子(如折射指数、衰减系数、充塞系数等)、信号处理方法等误差引起。通过对相关雷达参数的相对误差和回波强度绝对误差曲线分析得出,雷达参数天线增益优于0.1 dB、发射峰值功率优于10%、发射频率优于0.1%、脉冲宽度优于1%、波束宽度优于0.01°时,反射率因子测量误差将<0.8 dB z,可满足新一代天气雷达反射率因子测量误差范围在±1 dB内的技术要求。

Errors of echo intensity observations mainly result from parameters of radar itself, i. e. , transmitting power, beam width, antenna gain, system Loss, and meteorological factors, namely, refractive index, attenuation coefficient, full of coefficient, and method of signal processing and the like. Through the correlation radar parameter relative error and the echo intensity absolute error curve analysis, when the radar parameter antenna gain surpasses 0. 1dB, the transmitting peak power surpasses 10% , the transmitting frequency surpasses 0.1% , the pulse width surpasses 1% , the beam width surpasses 0. 01 degree, errors of echo intensity observations 〈 0.8dBz, it may satisfy errors of echo intensity observations of CINRAD scope in _＋ ldB in specification.