A-GPS辅助定位技术研究

A-GPS Positioning Terminal Testing Technology Research

摘要:

A-GPS定位技术是结合地面网络资源和传统卫星导航定位,利用蜂窝网基站代为传送卫星星历等信息,提高接收机对卫星信号的捕获概率,缩短接收机首次定位时间;在研究A-GPS对接收机辅助定位技术过程中,重点分析了A-GPS对接收机信号捕获的辅助原理,分析表明,基于A-GPS的信号捕获时间可缩短为传统接收机的1/40;利用GNSS导航信号模拟器和蜂窝网基站模拟器组建了室内A-GPS模拟测试系统,通过模拟基站的信令方式将参考时间、多普勒频移预测值以及星历或历书等辅助数据传输给用户接收机,实现了辅助数据在信令通道的编码和传输。

Abstract:

A-GPS positioning technology is a combination of terrestrial network resources and traditional satellite navigation. Using cellular network base station and transmitting the auxiliary information to shorten time to first fix of the receiver and reduce the user's dependence on the satellite. In the study of A-GPS receiver assisted positioning technology process. Focuses on how A-GPS information assist the receiver signal acquisition. Then, using GNSS navigation signal simulator and cellular base station simulator to set up indoor A-GPS simulation tests system and studying on transmitting reference time, Doppler shift predicted values and ephemeris or almanac and other assisted information to the receiver, which implements accessibility for data encoding and transmission of signaling channels.