高动态环境下高灵敏度GPS跟踪环路算法的研究  

Study on GPS Tracking Algorithm with High Sensitivity in High Dynamic Environment

作　　者：胡开通[1,2] 

机构地区：[1]太原理工大学信息工程学院,山西太原030024 [2]大同煤矿集团恒宝源煤业有限公司,山西大同036012

出　　处：《山西科技》2016年第3期75-78,共4页Shanxi Science and Technology

摘　　要：随着用户对接收机性能要求的不断提高,GNSS接收机在高动态环境下实现高灵敏度、高定位精度的定位性能成为研究的热点。在GNSS接收机中,传统跟踪环路在高动态情况下难以满足用户对定位精度的要求。针对复杂环境下GNSS接收机定位精度不高的问题,提出了高灵敏度GPS跟踪环路算法以改善GPS接收器的定位精度,通过经典超前—滞后延迟锁定环对码延时跟踪,并结合三阶PLL对载波相位跟踪。仿真实验表明:通过对中频信号码相位和载波相位估计,避免了使用传统FLL进行频率估计引起的码延迟效应和近似误差。与传统跟踪环路相比,在动态环境下码跟踪误差明显小于传统跟踪环路。As the continuous increase of users＇ requirements for the performance of receiver＇s performance, to achieve the high sensitivity and high positioning precision of the positioning performance of GNSS in high dynamic environment is becoming a hot spot of research. In the GNSS receiver, the conventional tracking loop＇s positioning accuracy is difficult to meet the user＇s requirements in high dynamic conditions. In the light of the problem of that the positioning accuracy of GNSS receiver is not high in complex environment, this paper presents a GPS tracking loop algorithm with high-sensitivity,aiming at improving positioning accuracy of GPS receivers, realizing the code delay tracking through the use of classical lead-lag delay locked loop, and realizing the carrier phase tracking combined with the third-order PLL. The simulation results show that the estimation of the code phase and carrier phase of IF signal can avoid the code delay and approximation error caused by traditional FLL, and the code tracking error in dynamic environment is significantly less than the traditional tracking loop.

关 键 词：全球定位系统 跟踪环路 高灵敏度跟踪算法 弱信号 

分 类 号：TN967.1[电子电信—信号与信息处理]