摘要
研究卫星导航跟踪优化设计问题。当接收机载体处于高动态运动状态时,传统跟踪环路极易容易失锁。若采用矢量跟踪环路,虽具有较好的跟踪性能,但在信号环境极端恶化情况下,状态估计将变差,严重影响导航定位的精确度和稳定性。针对上述问题,提出采用自适应矢量跟踪环路(A-VLL)的方法。A-VLL能够自适应调整测量噪声协方差矩阵,从而达到自适应调整反馈估计并降低估计误差的目的。仿真表明,在载体高动态、接收信号信噪比下降严重时,采用自适应矢量跟踪环路具有较好的跟踪精度和稳定性。
This paper is based on the background which is the study of optimization design in satellite navigation. When the carrier receiver is in high dynamic motion state, the traditional tracking loop lock is easy to lose. If it uses the vector tracking loop, although it has good tracking performance, but in the case of extreme deterioration environ- mental of signal, state estimation can become worse and then seriously affect the navigation and positioning accuracy and stability. According to the above problem, this paper adopted the adaptive vector tracking loop （A -VLL）. The A - VLL can adaptively adjust the measurement noise covariance matrix Rk and feedback estimation, and reduc the purpose of the estimation error. MATLAB simulation results show that the adaptive vector tracking loop has good ac- curacy and stability when the receiver is in high dynamic and weak signal motion state.
出处
《计算机仿真》
CSCD
北大核心
2014年第2期149-153,共5页
Computer Simulation
基金
国家自然科学基金资助项目(61174194)
航空科学基金资助项目(20110196004)
关键词
高动态
自适应
矢量跟踪环
High dynamic
Adaptive
Vector tracking loop
