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复杂环境下的多普勒频移变化及信号功率衰减均会对载波准确跟踪造成影响.在研究北斗卫星B1频点信号结构的基础上,建立以环路中相关积分值为观测量的非线性EKF模型和UKF模型,并提出利用滤波估计状态量进行状态反馈控制的方法,从而解决了载波跟踪环路在高动态及弱信号环境中难以高性能工作的问题.实验结果表明,状态反馈控制的EKF模型和UKF滤波模型能准确地跟踪弱信号及高动态下的信号变化,从而有效控制跟踪误差,为实现快速准确的载波跟踪奠定了基础.
Doppler frequency shift under complex environment and signal power attenuation will affect the accurate tracking of the carrier.Based on the study of the signal structure of the Beidou satellite B1 frequency point, the non-linear EKF model and UKF model are proposed and the state feedback control method based on filter estimation state quantity is put forward to solve the problem that the carrier tracking loop can not work in high dynamic and weak signal environments with high performance.The experimental results show that the state feedback control EKF model and UKF filter model can accurately track the weak signal and signal changes under high dynamic, so as to effectively control the tracking error, which lays the foundation for fast and accurate carrier tracking.