【摘要】 气象雷达是中小尺度天气预报的主要大气探测工具之一。地物杂波严重干扰气象回波信号的识别、影响降雨量的定量测定和雷达数据的进一步处理,本课题从经济和现役天气雷达的现状出发选用非相参三脉冲对消器来抑制地物杂波,提取气象信号。本抑制器在脉冲重复频率200Hz,天线转速3转/分,脉冲宽度2μs,波长6.6cm的713雷达上作实验,取得地物杂波抑制比大于21分贝,气象信号损失小于5分贝的结果。 本文对气象雷达地物杂波抑制器的可取方案进行简要分析,给出二脉冲和三脉冲对消器的杂波和气象信号的衰减曲线,对本课题的非相参MTI系统进行说明,最后给出外试验埸结果、分析以及今后的工作的设想。更多还原

【Abstract】 Weather radar is one of the major sounding tools for the prediction of small scale and middle scale weather phenomena.The ground clutters seriously effect the recognition of weather echoes、 accuracy of measuring rain rate and further processing of radar data.From the point of view of the situations of the economy and the situations of the present weather radar,non-coherent 3-pulse canceller is selected for rejecting ground-clutters and abstracting weather signals.For model 713 weather radar ,prf=200hz,antenna scanning 3rpm and waTelength-3cm,the following results are obtained:ground clutter cancellation rate more than 21db and weather signal loss less than 5db.The methods of the ground-clutter rejecting which could be selected for the weather radar are discused,then attenuating curves of the ground clutter and the weather signal for 2-pulse and 3-pulse cancellers are given,Finally,the experimental results of the field are given analysed and considered for further research.更多还原