基于最大似然估计的高动态GPS载波跟踪环  

Maximum Likelihood Estimation Based High Dynamic GPS Carrier Tracking Loop

作　　者：向洋[1] 胡修林[1] 

机构地区：[1]华中科技大学电子与信息工程系,湖北武汉430074

出　　处：《电子学报》2010年第7期1563-1567,共5页Acta Electronica Sinica

摘　　要：基于最大似然估计提出了一种全新设计的GPS载波跟踪环结构,并将该环路应用于高动态、低信噪比条件下的GPS载波频率跟踪.文中给出了环路的设计细节,并详细讨论了环路中各模块的功能及模块之间的参数传递.利用具有典型高动态参数的GPS载波信号对环路的跟踪性能进行了测试.测试结果表明,与普通GPS接收机的载波跟踪环相比,该环路对高动态环境下的失锁门限和门限附近的频率跟踪精度均有显著改善.A new structure of GPS carrier tracking loop is proposed based on maximum likelihood estimation.The loop is used for tracking GPS carrier frequency under the circumstance of high dynamic and low signal-to-noise ratio.Details of the loop are presented in this paper,and the functions of all the blocks in the loop as well as parameter transmission among the blocks are discussed.Performance of the loop is tested using GPS carrier signals with typical high dynamic parameters.Results of the tests indicate that the designed loop greatly improves the loss-of-lock threshold and frequency tracking precision near the threshold compared with the ones in common GPS receivers.

关 键 词：最大似然估计 高动态GPS 载波跟踪 

分 类 号：TN850.4[电子电信—信息与通信工程]