三亚SC天气雷达强度“马赛克”问题仿真溯源分析

The Reflectivity Factor Mosaic Phenomenon Simulation Traceability Analysis for Sanya SC Weather Radar

针对三亚SC天气雷达在台风"威马逊"中出现的回波强度"马赛克"现象,采用实验验证和仿真溯源的方法,对批式双重复频率技术(dual PRF)回波强度的影响进行分析。通过改变脉冲重复频率、脉冲累计个数、信号处理算法等方式,开展对比观测实验,真实复现"马赛克"现象,并追踪回波马赛克现象出现的天气和雷达参数条件。同时,基于天气雷达发射脉冲的时间自相关特性,采用大气分层模型,建立天气雷达发射端到接收端的I/Q信号仿真算法,通过采用端到端I/Q信号算法,结合实测数据和雷达参数情况,正演分析得到"马赛克"回波,证实了回波"马赛克"现象的成因。

Aiming at the mosaic phenomenon of reflectivity factor in typhoon ＂ Johnson Weimar＂ of Sanya,based on the experimental validation and simulation method,the influence of the Dual PRF to the reflectivity factor is first analyzed.By changing the different PRT,accumulate number and signal processing algorithm,the mosaic phenomenon is recurrence during the experiment and the weather conditions and radar parameters are traced.At the same time,based on weather radar transmitted pulse time autocorrelation properties,using the atmospheric stratification model,the end to end weather radar I/Q signal simulation algorithm is estabilished,By using the end to end I/Q simulation methods,the mosaic phenomenon of reflectivity factor is obtained,the causes of echo ＂ mosaic＂ phenomena is confirmed.