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中国区域卫星定位系统(CAPS)是卫星导航通信一体化的系统。当利用CAPS微小卫星终端系统进行卫星通信时,所用的天线口径极小,增益低,终端的有效全向辐射功率EIRPe较小,整个通信链路的余量较小。虽然C波段的降雨衰减远没有Ku波段大,但是相对于微小卫星终端的整个卫星通信链路来说,降雨带来的信号衰减、地球站接收天线G/T值的变化以及对卫星通信上、下行链路载噪比的影响也是不可忽视的。文章对这些影响进行了分析,并利用ITU-R给出的降雨衰减预报模式,给出了C波段的降雨衰减的计算方法及结果,并且分析了降雨对CAPS微小卫星通信系统的整个链路余量的影响。
China Regional Satellite Positioning System (CAPS) is a satellite navigation and communication system. When using CAPS micro-satellite terminal system for satellite communications, the antenna used is very small in diameter and low in gain. The terminal has an effective EIRPe of less effective omnidirectional radiation and a smaller margin of the entire communication link. Although the C-band rainfall attenuation is far less than the Ku-band, relative to the entire satellite communication link of the micro-satellite terminal, signal attenuation due to rainfall, changes in the G / T value of the receiving antenna of the earth station, The impact of downlink carrier to noise ratio is also not negligible. The paper analyzes these effects and uses the rainfall attenuation forecast model given by ITU-R to give a calculation method and result of rainfall attenuation in C-band, and analyzes the effect of rainfall on CAPS micro-satellite communication system The impact of volume.