摘要
针对GPS接收机上电开机后热启动问题,阐述一种新型的快速热启动方法。首先研究了卫星导航测距定位原理,在此基础上深入分析接收机基带信号处理链路。当处于卫星信号跟踪状态下,利用接收机实时时钟单元RTC直接预测卫星发射时间,省去了通常耗时的子帧同步过程。此快速热启动策略,相比传统方法,既满足了定位速度要求,又具有较高时间准确度,热启动首次定位时间大为缩短。
For the question of fast hot- start in the GPS receiver after power- on, a new fast hot- start method is introduced. The analysis is presented for the method of pseudorange measurement in navigation and positioning at first. Base on this,the baseband signal process is researched. While the signal from the satellite is tracked, the new hot- start method is assistant by the RTC of the receiver,and the conventional subframe synchronization could he avoided,which costs much time. Compared with the conventional way,the time to first fix in the hot- start is shortened sharply.
出处
《现代电子技术》
2009年第1期11-13,共3页
Modern Electronics Technique