摘要
高动态环境存在较大的多普勒频移,这使得普通的GPS接收机在没有惯导辅助的情况下很难可靠工作。为了同时满足高动态GPS接收机动态性能和跟踪误差两方面的要求,文中根据时频分析的理论,提出了一种基于Wigner-Ville分布的高动态频率跟踪算法。在分析高动态载波相位模型和Wigner-Ville分布理论的基础上,给出算法的实现方法。仿真结果表明:该算法可在低信噪比下跟踪高动态GPS信号。
There exists great Doppler frequency shift under high dynamic circumstances,thus the common GPS receiver could not work reliably without the help of inertial navigation devices.To satisfy the requirements of dynamic performance and tracking accuracy during GPS signal receiving under high dynamic circumstances,a high dynamic frequency tracking algorithm based on Wigner-Ville distribution is proposed according to the theory of time-frequency analysis.Based on analyzing the model of high dynamic GPS carrier phase and the theory of Wigner-Ville Distribution,the implementation of the algorithm is presented.The simulation results show that the algorithm could track the dynamic signal of GPS receiver in high dynamic and low SNR circumstance.
出处
《通信技术》
2010年第3期21-23,共3页
Communications Technology
关键词
高动态
维格纳-威利分布
跟踪
同步
high dynamic
Wigner-Ville distribution
tracking
synchronization
