参考站相对位置对AGNSS接收机卫星信号捕获的影响  

Influence of Reference Station Position on Satellite Signal Acquisition for AGNSS Receiver

作　　者：李罡[1] 常江[1] 吕晶[1] 李广侠[1] 

机构地区：[1]解放军理工大学通信工程学院卫星通信重点实验室,南京210007

出　　处：《宇航学报》2011年第6期1288-1291,共4页Journal of Astronautics

基　　金：国家863高技术研究发展计划(2008AA12Z307)

摘　　要：AGNSS(Assisted Global Navigation Satellite Service)接收机的性能受辅助信息准确程度的影响。由于参考站位置和终端的真实位置存在偏差,使得接收机获得的参考多普勒频移不准确,将增大弱信号条件下终端对卫星信号频率维搜索的范围。为分析参考站相对位置对AGNSS接收机卫星信号捕获的影响,推导了参考站相对位置偏差引起的多普勒频移分布以及最大频率搜索空间的表达式,并进行了数值仿真和分析,得到了一些有用的结论。The performance of the AGNSS（Assisted Global Navigation Satellite Service） receiver is affected by the accuracy of assisted information.The assisted Doppler obtained by the AGNSS receiver is not accurate due to the distance between the reference station and the receiver,which will enlarge the frequency search range in weak signal conditions.In order to evaluate the influence of reference station position on satellite signal acquisition,the formulas of Doppler error distribution and maximum frequency search range are derived to analyze the impact.Some useful results are given by numerical simulations and analysis.

关 键 词：AGNSS 弱信号 捕获 多普勒偏差 

分 类 号：P228[天文地球—大地测量学与测量工程]