不同INS器件对GNSS/INS深耦合接收机跟踪环路的影响

摘要

The effect of three different property levels of INS devices, navigation level, tactical level and commercial level,on GNSS/ INS deep-coupled receiver tracking loop is studied under different dynamic conditions for the INS devices selection in deep-coupled receiver. From this, the GNSS/INS deep-coupled receiver can reduce the critical bandwidth of lock-lose to a much greater extent, improve the lock-lose conditions of the traditional receiver and the carrier tracking precision. The critical bandwidthes of the navigation level .tactical level and commercial level deep-coupled receiver are 1 "1.8,1.5 -2. 7 Hz, and 2 ~ 4 Hz, respectively. The carrier tracking errors are less than 19?22?and27?respectively.The velocity errors are0.05 -0.5,0.1 -1.0m/s,and 0.2-2.0 m/s, respectively. Above results provide theoretical basis for the INS devices selection in deep-coupled receiver.%针对在GNSS/INS深耦合接收机产品设计中INS器件的选用问题,仿真研究了不同动态条件下,导航级、战术级和商业级这3种不同性能级别的INS器件对GNSS/INS深耦合组合接收机跟踪环路的影响.深耦合组合接收机能较大程度上降低失锁临界带宽,提高载波跟踪精度.导航级战术级及商业级深耦合接收机在不同动态下的载波环临界带宽可以分别压窄到1～1.8,1.5 ～2.7 Hz和2～4Hz;临界带宽下的载波跟踪环的误差分别在19°,22°和27°以内;速度误差分别在0.05～0.5,0.1～1.0,0.2～2.0 m/s.上述结果为GNSS/INS深耦合接收机中的INS器件选型提供了理论依据.