多普勒辅助RangeFit快速定位方法  

A novel algorithm for rapidly positioning using Doppler-aided RangeFit

作　　者：孙金海[1] 汪峰[1] 李金海[1] 阎跃鹏[1] 

机构地区：[1]中国科学院微电子研究所电子系统总体室,北京100029

出　　处：《哈尔滨工程大学学报》2011年第10期1351-1354,共4页Journal of Harbin Engineering University

基　　金：国家863计划基金资助项目(2009AA12Z314)

摘　　要：常规GNSS快速定位算法(即首次定位时间TTFF<1 s)中存在初始时间、初始位置、钟差等误差总和小于150 km的约束门限,即使初始位置十分准确,初始时间误差也不能超过210 s,这使得只有在热启动和AGNSS条件下,才能实现TTFF小于1 s.该文针对常规快速定位算法的这种缺陷提出一种多普勒辅助RangeFit快速定位法,有效拓展了快速定位算法的适用范围.数据分析及实测证明,该方法能够在初始时间误差在千秒甚至万秒以内且初始位置误差未知的情况下完成GNSS快速定位,使得TTFF小于1 s.The global navigation satellite system （GNSS） can position rapidly within one second if the sum of the initial position error, initial time error, and other factors is less than 150 km; that is, the initial time error can not be larger than 210 s even when the initial position error is zero. So the time to first fix （TFFF） of the GNSS could be within one second only in the instance of a hot start or Aided GNSS. To resolve the problem, a novel algorithm for rapid positioning using a Doppler - aided range fit was proposed. The algorithm can function in conditions other than a hot start and Aided GNSS. Analysis and tests in real data show that the proposed algorithm works correctly and achieves the TI＇FF within one second when the initial time error exceeds one thousand or even ten thousand seconds, as welt as in the condition of an unknown initial position error.

关 键 词：GNSS快速定位 TTFF RangeFit SNAPSHOT 多普勒辅助 

分 类 号：TN961[电子电信—信号与信息处理]