基于I、Q信号的北斗接收机跟踪环路设计

传统的北斗接收机一般采用标量跟踪环，每个通道的卫星相互独立，在此 基础上，又发展起来了基于矢量跟踪的接收机，使每个通道的卫星跟踪不再相互独立。 提出的基于I、Q 信号观测的接收机跟踪环路，保留矢量跟踪的特点，并且采用EKF 作 为跟踪环路预处理滤波器，代替传统跟踪环路的鉴别器，可以在高动态的环境下对卫星 信号进行跟踪，提高环路的稳定性，从而可以有效地提高BDS/INS 深组合导航滤波器观 测量的估计精度。主要对高动态信号跟踪进行仿真，并与传统的标量跟踪方法和矢量跟 踪方法的跟踪能力进行比较。实验表明， 改进的矢量跟踪环能够在高动态的环境下运 行，比起传统环路有更小的跟踪误差。

Design of BDS Receiver Tracking Loop Based on the I & Q Signals

Generally, the traditional BDS receiver uses scalar tracking loop, with satellites in each channel independent to each other. Based on this, receivers with vector tracking are developed, by which satellites in different channels are no longer independent. However, the algorithm in this paper remains the characteristic of the vector tracking, and applies EKF as tracking loop filter. As a substitute for the traditional tracking loop discriminator, it can track the satellite signals in high dynamic environment and improve the stability of the loop, which can effectively improve the estimation precision of the observation quantity of BDS/INS deep integrated navigation filter. This paper mainly simulates the high dynamic signal tracking and compares the tracking ability between the traditional scalar tracking method and the improved vector tracking method. The experimental results show that the improved vector tracking loop is able to run in high dynamic environment, and has fewer errors than the traditional one.