Theoretical analysis and engineering solution of parasitical spectrum in the CINRAD transmitter  

作　　者：Zhe Li XiuMei Chai YuChun Gao 

机构地区：[1]Meteorological Observation Centre of China Meteorological Administration,Beijing 100081,China

出　　处：《Research in Cold and Arid Regions》2012年第4期357-360,共4页寒旱区科学（英文版）

基　　金：supported by the National Natural Science Foundation of China (40975018);the Meteorological Observation Centre of China Meteorological Administration

摘　　要：To deal with the universal problem of parasitical frequency spectrum in China New Generation Weather Radar transmitter, this paper establishes mathematical models for parasitical signals existing in radar transmitters and analyzes their effects on weather radar performance. Based on an engineering analysis of their possible sources, a step-by-step method to eliminate parasitical spec- trum is presented, which is applied to troubleshooting experimental weather radar. Eventually, parasitical spectrum is basically eliminated. As a result, improved spectrum purity and reduced phase noise is achieved. Moreover, accuracy for velocity estimate as well as ground clutter suppression ability of the radar system is enhanced.To deal with the universal problem of parasitical frequency spectrum in China New Generation Weather Radar transmitter, this paper establishes mathematical models for parasitical signals existing in radar transmitters and analyzes their effects on weather radar performance. Based on an engineering analysis of their possible sources, a step-by-step method to eliminate parasitical spec- trum is presented, which is applied to troubleshooting experimental weather radar. Eventually, parasitical spectrum is basically eliminated. As a result, improved spectrum purity and reduced phase noise is achieved. Moreover, accuracy for velocity estimate as well as ground clutter suppression ability of the radar system is enhanced.

关 键 词：CINRAD frequency spectrum parasitical modulation 

分 类 号：TN957.3[电子电信—信号与信息处理] TP333[电子电信—信息与通信工程]