摘要
提出了一种在有辅助信息的定位系统(AGPS)中实现快速定位的方法,同时分析了本地时间精度和伪距误差对预测准确度的影响.仿真结果表明,在RTC偏差小于27秒、预测伪距偏差小于87千米的条件下该方法能够正确的预测和定位,TTFF达到1秒量级;在RTC偏差接近一分钟、预测伪距偏差接近200千米的条件下该方法能够正确的预测和定位,TTFF达到4秒量级.相比于一般的预测伪距方法,该方法容易实现,具有一定的实用性.
This paper develops a method for decreasing the TTFF and fast fixes position in the Aided Global Position System （AGPS）,which also analyzes the influence of local time accuracy and pseudo range deviation. The simulation results show that the new method can correctly predict pseudo range and give out the accurate users＇ position in 1 second of TTFF,when the RTC＇s average error could be around 27 seconds and the predicting satellite position＇s average error could be about 87 kilometers; the same situation for 4 seconds of TTFF,when the RTC＇s average error could be around 1 minute and the predicting satellite position＇s average error could be about 200 kilometers; this can be applicable in many circunstanses.
出处
《微电子学与计算机》
CSCD
北大核心
2010年第7期157-160,共4页
Microelectronics & Computer
