加速度冲击对卫星接收机性能影响

Influeuce of Acceleration Shock on Performance of GNSS Receiver

摘要:

基于加速度对晶体振荡器输出频率的影响,研究了加速度冲击对卫星接收机性能的影响。首先,利用ANSYS软件仿真分析了加速度冲击作用对石英晶体形变的影响过程,在此基础上建立加速度冲击环境下卫星接收机参考源晶振的频率偏差数学模型；接着,分析在加速度冲击下由参考晶振频率偏差对接收机射频前端输出中频信号的影响,并结合卫星接收机的工作原理阐述了加速度冲击对其跟踪性能的影响。仿真结果表明,加速度冲击会使接收机跟踪环路的性能恶化,时间较长会引起跟踪环路失锁。

Abstract:

In this paper, based on the frequency of the crystal oscillator, the influence of acceleration shock on performance of GNSS receiver was studied. Firstly ,the process of the quartz crystal deformation was analyzed by using ANSYS finite element method when the quartz crystal of the GNSS receiver suffers from acceleration shock, thus the mathematical model of the frequency offset of the standard crystal vibration of the GNSS receiver was built in the acceleration shock environment. Then the influence of the frequency standard offset on the output IF frequency of the RF receiver front-end was described, and also the influence on the receiver tracking performance was elaborated combined with working principle of the GNSS receiver. The simulation results showed that acceleration shock could deteriorate the performance of tracking loop of GNSS receiver, and make the tracking loop a failure when it lasts for a long time.