星历和星钟参数辅助精度对AGPS接收机捕获性能的影响  

Influence of Assisted Ephemeris and Space Vehicle Clock Precision on AGPS Receiver Acquisition Performance

作　　者：谷文飞[1] 吕晶[2] 常江[2] 徐荣[2] 

机构地区：[1]解放军理工大学通信工程学院研究生四队,南京210007 [2]解放军理工大学通信工程学院训练部,南京210007

出　　处：《电讯技术》2011年第4期75-78,共4页Telecommunication Engineering

基　　金：国家高技术研究发展计划(863计划)资助项目(2008AA12Z307)~~

摘　　要：根据辅助型接收机能从辅助网络获取导航电文的特点,提出了一种精简星历和卫星时钟参数辅助算法。基于MS-based方式,对比分析了全参数辅助、精简参数辅助、截短参数辅助以及历书辅助模式下的多普勒偏差和无线通信网络所需传输的信息量。仿真和实验结果表明,截短的星历和星钟参数辅助同样能很快定位捕获时刻的多普勒频移,额外频移误差增加不足1 Hz,辅助数据量却减少了1.55倍。According to the feature that the AGPS（Assisted GPS） receiver can obtain navigation data from assist- ed network, a new algorithm for assisted Doppler is proposed. Based on MS - based mode, the Doppler bias and transported information on wireless network are compared and analysed in such mode as full ephemeris and SV （Space Vehicle） clock data assistance, reduced ephemeris and SV clock data assistance, truncated ephemeris and SV clock data assistance and almanac data assistance. Simulation and experimental results show that in the truncated assistance mode, Doppler shift can also be well calculated with negligible extra bias not more than 1 Hz, but assisted data is reduced by 1.55 times.

关 键 词：AGPS接收机 微弱信号环境 载波频偏 捕获性能 

分 类 号：TN96[电子电信—信号与信息处理] TN85[电子电信—信息与通信工程]