基于UKF的GPS L1 C/A码微弱信号跟踪算法  

Weak Signal Tracking Algorithm Base on UKF for L1 C/A Code

作　　者：曾庆喜[1] 唐琳琳[1] 王庆[2] 陈小惠[3] 

机构地区：[1]南京航空航天大学能源与动力学院,南京210016 [2]东南大学仪器科学与工程学院,南京210096 [3]南京邮电大学自动化学院,南京210046

出　　处：《舰船电子工程》2014年第1期58-62,共5页Ship Electronic Engineering

基　　金：中央高校基本科研业务费专项资金资助(编号:NS2012037);南京航空航天大学研究生创新基地(实验室)开放基金资助项目(编号:kfjj120221)资助

摘　　要：为了实现高灵敏度的软件接收机,提出了一种基于UKF的GPS L1C/A码微弱信号跟踪算法。该算法使用UKF实现了微弱信号的L1C/A码和载波跟踪。通过构建模型,建立方程,并通过采用仿真噪声干扰下的微弱GPS C/A中频信号对该算法进行实验性能分析。仿真实验结果表明,UKF算法可以实现对载波相位跟踪、载波频率跟踪以及码相位跟踪性能的改善,并且大大简化了计算的复杂度,具有较高的跟踪灵敏度和精度,是一种适合软件接收机实现的算法。To achieve high sensitivity GPS software receiver, a GPS L1 C/A code signal tracking algorithm based on Unscented Kalman filter（UKF） is put forward, which can realize the tracking of the L1 C/A code and carrier for weak sig nal. Through building model and establishing equations, the algorithm performance is analyzed by using a weak intermediate frequency signal with the simulated noise. Simulation results show that. UKF algorithm can improve the tracking perform ance of the carrier phase, the carrier frequency and code phase. It is suitable for implementing the software receiver, reducing the complexity of calculation, raising the sensitivity and accuracy of tracking.

关 键 词：GPS软件接收机 微弱信号 跟踪 

分 类 号：U666.1[交通运输工程—船舶及航道工程]