两种低噪声放大器性能对地面接收系统影响的分析

The Analysis for Influence of the Performance of Two LNA on the Receiving System

针对进口和国产低噪声放大器（ＬＮＡ）的增益和噪声温度指标，就中科院遥感卫星地面站运行接收系统的主要系统性能指标即Ｇ／Ｔ值和误码率进行了理论分析和实际测量。结果表明，国产ＬＮＡ比进口ＬＮＡ的增益提高９．８ｄＢ，噪声温度降低４Ｋ，接收系统增益改善约０．２５ｄＢ／Ｋ，１０－７误码率对应的Ｅｂ／Ｎ０改善约０．７ｄＢ。

The influence of the performance of two types of LNA, chinese produced and imported,on the G/T and BER of the receiving system a researched. The work is undertaked on the receiving station of Remote Sensing Satellite Ground Station of Chinese Academy of Science. The results indicated that the receiving system gain is increased by 0.25 dB/K and E b/N 0 is improved by 0.7 dB with 10 -7 BER, when the gain of Chinese produced LNA is 9.8 dB better and the noise temperature is 4 K lower than import LNA.