一种导航接收机启动策略的优化方案

摘要

TTFF(Time To First Fix)is one of the important indexes to show the capability of a navigation receiverto rapidly locate information and it is closely related to its cold or hot-start method,warm start method and hot-start method of a navigation receiver.Based on the BDS researched and developed by our country and its unique features,this paper introduces a research result for optimizing start method.The new optimized start method can make full use of the receiver's hardware resources,can distribute and use each channel to search for the satellite signals more reasonably,can make a better use for all the known information and can narrow down receiver's research scope and increase the success rate to capture satellite signals.The research result shows that the recommended start method can effectively help to shorten a navigation receiver's TTFF.%首次定位时间(TTFF)是导航接收机快速定位能力的重要指标之一,而首次定位时间和导航接收机的冷、温、热启动策略密切相关.基于我国自主研发的北斗卫星导航系统(BDS),根据其特点,提出一种优化启动策略.该启动策略充分利用接收机的硬件资源,合理分配使用各个通道进行卫星信号的搜索,更加充分的使用已知信息,缩小接收机搜索范围和增加捕获卫星信号的成功率.实验结果说明该启动策略可有效缩短导航接收机的首次定位时间.