CINRAD/SA发射机极限改善因子受干扰的成因分析  

Analysis of Interference Causes for Limit Improvement Factor of CINRAD/SA Transmitter

作　　者：周红根 柴秀梅[2] 胡帆 汤建国 张正 李喆[2] 张宇尧 

机构地区：[1]江苏省气象技术装备中心,南京210008 [2]中国气象局气象探测中心,北京100081 [3]江苏省南通市气象局,南通226008 [4]江苏省吴江市气象局,吴江215200

出　　处：《气象》2012年第8期1029-1032,共4页Meteorological Monthly

基　　金：中国气象局行业专项(2009115054)资助

摘　　要：发射机极限改善因子是新一代天气雷达出厂验收测试的最重要的技术指标之一,它分为发射机输入极限改善因子和输出极限改善因子两项测试内容。参照普来赛西门子雷达公司提供的测试方法,用频谱仪检测信号功率谱密度分布,从中求取信号和相噪的功率谱密度比值(S/N)。然而在出厂验收测试和巡检中,发现不同频率的干扰毛刺出现在信号功率谱密度分布图上,它们可能会影响发射机极限改善因子的测量指标及发射机相位的稳定性等。文章从CINRAD/SA雷达发射机极限改善因子测试信号链路进行分析,查找干扰毛刺的产生原因及检测检修方法,为雷达技术保障人员提供现场维修和维护方面的经验。Transmitter limit improvement factor is one of the most important technological indexes for de- livery test of CINRAD and it comprises transmitter input and output limit improvement factors. Based on the testing methods offered by Plessey-Siemens Company, a spectrum analyzer is used to measure the sig- nal power spectrum density distribution, and then the signal-to-noise ratio （S/R） is obtained. However, during the delivery test and patrol examination, the interfering spikes at different frequency are often found on the graph of signal power spectrum density distribution and they may affect measurement indexes of transmitter limit improvement factor and transmitter phase stability and so on. This paper analyzes test signal circuit and examines causes for interfering spikes and repairing methods and hence provides useful field maintenance experience for radar technologists.

关 键 词：干扰 发射机 极限改善因子 信噪比 

分 类 号：P481[天文地球—大气科学及气象学]