辅助型GPS接收机中伪码相位延时及其不确定度估计算法研究 |
| |
引用本文: | 宋成,王飞雪,庄钊文.辅助型GPS接收机中伪码相位延时及其不确定度估计算法研究[J].空间科学学报,2009,29(6):620-626. |
| |
作者姓名: | 宋成 王飞雪 庄钊文 |
| |
摘 要: | 快速捕获卫星信号是研制辅助型GPS (A-GPS)接收机所必须解决的一项关键技术. 针对A-GPS接收机能从辅助数据中获取有效星历的特点, 本文提出了一种伪码相位延时及其不确定度估计算法. 该算法在对建立的信号发射时刻方程泰勒展开的基础上, 利用辅助信息建立了伪码相位延时及其不确定度估计方程. 分析和仿真表明, 提出的算法能有效压缩剩余卫星伪码相位延时不确定度, 加快A-GPS接收机的捕获速度.
|
关 键 词: | A-GPS 微弱信号环境 伪码相位延时 不确定度 |
收稿时间: | 1900-01-01 |
Estimate Algorithm for Pseudo-code Phase Delay and its Uncertainty in the Assisted GPS Receiver |
| |
Abstract: | Quick acquisition of satellites signals is a key technology in the assisted GPS (A-GPS) receiver. Considering that the A-GPS receiver can obtain the valid ephemeris data from the assistance data, a new estimate algorithm for pseudo-code phase delay and its uncertainty are proposed. On the basis of the Taylor approximation for the time of GPS signal transmission function, the estimate equation of pseudo-code phase delay and its uncertainty are proposed by using the assistance data. Simulation and experimental results show that the proposed algorithm can effectively compress the uncertainty of pseudo-code phase delay to the rest satellites, and can accelerate the signal acquiring speed of A-GPS receiver. As for the conventional un-assisted GPS receiver, the pseudo-code phase delay and its uncertainty can also be well estimated by the algorithm proposed in the paper when effective ephemeris data, satellite clock bias and pseudo-range amendment information are pre-stored in the receiver. |
| |
Keywords: | |
|
| 点击此处可从《空间科学学报》浏览原始摘要信息 |
| 点击此处可从《空间科学学报》下载免费的PDF全文 |
|