惯导辅助的北斗接收机深组合环路跟踪方法研究

Survey on INS-Aided Beidou Receiver with Ultra-Tight Integration Tracking Loops

为了减小接收机信号跟踪环路的滤波带宽,提高接收机的灵敏度和动态应力承受范围,提出一种惯导辅助北斗接收机深组合环路跟踪方法。该方法将外界惯导系统的测量值反馈给接收机信号跟踪环路,使接收机能准确地预测出接收到的载波信号的多普勒频移变化量,进而准确、及时地调整载波数控振荡器的输出频率。仿真结果表明:该方法能有效改善北斗卫星信号跟踪效果。

In order to decrease the bandwidth of PLL tracking loops of Beidou receiver,thus to offer higher sensitivity and broader dynamic stress,an INS-aided ultra-tight integration with PLL method is proposed.It utilizes the result of INS to predict the correct doppler then to adjust the carrier NCO accordingly in time.The simulation test shows that the INSaided PLL can provide pretty good performance than ordinary PLL.