高轨GPS信号可用性分析  

Analysis of high altitude GPS signal availability

作　　者：闻长远[1] 岳富占[1] 仇跃华[1] 

机构地区：[1]北京卫星信息工程研究所,北京100086

出　　处：《电子设计工程》2014年第2期29-33,共5页Electronic Design Engineering

摘　　要：针对目前国内关于高轨GPS信号可见性研究大多以几何分析为主,工程实现指导性不强的缺点,文章以GPS接收机系统指标设计为目标,引入接收机等价增益概念,结合空间几何模型与信号链路传播特点,考虑GPS发射天线增益、接收机信号处理时间、GPS星座状况、接收天线增益等实际因素,对适用于高轨GPS信号可用性进行分析。仿真表明-180 dBW接收功率下,通过接收更多GPS旁瓣信号,GPS接收机能有效应用于高轨航天器导航。The domestic researches on high altitude GPS signal availability which only depended on the theoretical analysishave not yet taken the engineering into accout, with no sensitivity to the factors about the GPS satellite availability. By introducing the concept about the equivalent gain of the receiver, anlysising the space geometry model and the link propagation characteristics, this paper simulates of the GPS satellite availability, which conbines the engineering applications of the GPS transmitting antenna gain, the signal processing time, the current status of the GPS constellation and the receiver antenna gain. The results indicate that in sensitivity of -180dBW, by receiving more GPS sidelobe signal, the GPS receiver can be effectively used in the navigation system of the high altitude spaceflight.

关 键 词：GPS 链路预算 等价增益 接收机系统设计 GEO轨道 

分 类 号：TN96[电子电信—信号与信息处理]