北斗/INS深耦合接收机基带滤波器设计  

Baseband filter design of BeiDou/INS deeply coupled receiver

作　　者：郭瑶[1] 吴文启[1] 唐康华[1] 罗兵[1] 

机构地区：[1]国防科技大学机电工程与自动化学院,长沙410073

出　　处：《中国惯性技术学报》2013年第1期71-75,共5页Journal of Chinese Inertial Technology

基　　金：国家自然科学青年基金项目(名称:GNSS/MIMU深组合导航关键技术研究;编号:61104201)

摘　　要：随着北斗导航系统的组网,北斗/INS深耦合接收机的研制具有重要价值。传统的接收机基带滤波环路通常为相互独立的载波环路滤波器与码环路滤波器,码环路无法充分利用载波环路的信息,因此码环的动态性能受到限制。设计了载波/码组合滤波器,将载波环与码环的测量信息在一个滤波器内进行耦合,实时估计码相位、载波相位、多普勒频移与其变化率。通过北斗B3频点实际静态数据和GNSS模拟器采集的卫星-用户视线方向40g高动态数据进行离线跟踪测试,载波/码组合滤波环路可跟踪40g高动态信号,且静态数据的跟踪精度相比传统滤波环路提高27%。上述算法成功应用于基于Xilinx平台的卫星信号处理设备在线跟踪。提出的组合滤波器结构简单,测试有效,为北斗/INS深耦合接收机的工程实现提供参考。As BeiDou satellite navigation system is about to enter service, the development of BeiDou/INS deeply coupled receiver is of great value. The baseband filter tracking loop of traditional receiver is composed of independent carrier tracking loop and code tracking loop, and the dynamic performance code tracking is limited due to its unable to make the best use of carrier tracking measurement. In this paper, a new coupled filter of carrier/code tracking loop which couples the measurement of both was proposed. Then the code phase, carrier phase, Doppler frequency and Doppler frequency rate were estimated in real time. Finally, the efficiency of new proposed coupled tracking loop was verified by real off-line static BeiDou B3 data and GNSS simulator output high dynamic BeiDou B3 data with line-of-sight acceleration of 40g. The proposed carrier/code coupled tracking loop is able to track the high dynamic signal of 40g, and it improves static tracking precision by 27% compared to traditional tracking loop, and is successfully applied to on-line satellite signal tracking of the process module based on Xilinx. The proposed coupled filter tracking loop is brief and efficient, which provides a reference for BeiDou/INS engineering implementation.

关 键 词：跟踪环路 组合滤波器 高动态 北斗 INS深耦合 

分 类 号：U666.1[交通运输工程—船舶及航道工程]