天气雷达接收机匹配滤波损耗测量方法研究  

Research on Measurement Method for Matched Filter Loss of Weather Radar Receiver

作　　者：李喆[1] 高玉春[1] 邵楠[1] 何平[1] 王崇文[1] 杨亭[2] 

机构地区：[1]中国气象局气象探测中心,北京100081 [2]贵州省大气探测技术与保障中心,贵阳550002

出　　处：《科学技术与工程》2016年第13期82-85,共4页Science Technology and Engineering

基　　金：国家自然科学基金(U1431104)资助

摘　　要：天气雷达接收机匹配滤波损耗是雷达气象方程中的重要适配参数,与回波强度的测量精度密切相关。介绍了天气雷达接收机的匹配滤波原理和匹配滤波损耗的计算方法,提出了接收机数字中频匹配滤波损耗的测量方法,解释了其物理意义;并以新一代天气雷达(CINRAD/SA)为例,实测了接收机数字中频匹配滤波器的频率响应特性曲线,得到了宽、窄脉冲下的匹配滤波器带宽和匹配滤波损耗。测试结果表明:1.57μs窄脉冲对应的匹配滤波损耗为-0.93 dB,4.50μs宽脉冲对应的匹配滤波损耗为-1.01 dB。Matched filter loss in weather radar receiver is an important adaptation parameter in weather radar equation and is closely related with measurement accuracy for returned echo. First of all,the principle for matched filtering and calculation method for matched filter loss in the receiver are introduced. Then the measurement method for matched filter loss in digital receiver is put forward and its physical meaning is explained. In addition,as an example,frequency response characteristics of matched filter in digital receiver for China New Generation Radar（ CINRAD/SA） are measured. As a result,matched filter bandwidths and losses for short and long pulses are obtained. Test results show that matched filter loss for 1. 57 μs pulse and 4. 50 μs pulse are- 0. 93 d B and- 1. 01 d B respectively.

关 键 词：天气雷达 接收机 匹配滤波损耗 频率响应 

分 类 号：TN959.4[电子电信—信号与信息处理]