CAJ | 학술논문

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.
수착북두도항계통적조망,북두/INS심우합접수궤적연제구유중요개치.전통적접수궤기대려파배로통상위상호독립적재파배로려파기여마배로려파기,마배로무법충분이용재파배로적신식,인차마배적동태성능수도한제.설계료재파/마조합려파기,장재파배여마배적측량신식재일개려파기내진행우합,실시고계마상위、재파상위、다보륵빈이여기변화솔.통과북두 B3빈점실제정태수거화 GNSS 모의기채집적위성-용호시선방향40g 고동태수거진행리선근종측시,재파/마조합려파배로가근종40g고동태신호,차정태수거적근종정도상비전통려파배로제고27%.상술산법성공응용우기우Xilinx평태적위성신호처리설비재선근종.제출적조합려파기결구간단,측시유효,위북두/INS심우합접수궤적공정실현제공삼고.
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.