适用于空间分集的GNSS信号跟踪环路设计

Design of GNSS Signal Tracking Loop Suitable for Spatial Diversity

为解决火箭发射时姿态变化造成的信号接收不连续问题,提出了一种空间分集方式下的GNSS信号双锁相环路设计,对环路稳定性进行了分析,并给出了环路在单、双环切换时的处理方案。通过对此环路结构的分析和数学推导,证明了环路的可行性,并通过仿真对环路在各个状态下的稳定进行了验证。仿真结果表明,双锁相环路在各个状态下均能实现稳定跟踪,且有一定的输出信噪比增益,解决了信号接收不连续的问题。

In order to solve the signal receiving discontinuity caused by the attitude change of rocket launching,a GNSS signal dual phase locked loop design based on spatial diversity is proposed.The stability analysis of the loop is introduced,and the schemes of loop processing are given in both single loop switching and dual loop switching.The loop stability is proved by means of the analysis of loop structure and mathematical deduction,and it is verified by simulation in each state of the dual loop.The simulation results indicate that the dual phase locked loop can realize stable tracking in all states and has a certain output SNR gain.The signal receiving discontinuity can be solved by the dual phase locked loop design.