旋转状态下的GPS信号跟踪性能

对于旋转载体采用圆柱共形微带天线更易实现对GPS信号稳定和连续的接收,然而接收得到的信号含有载体旋转引入的调制效应,对接收机跟踪环路提出了较高的要求。在考虑圆柱共形微带天线相位中心偏移的基础上,分析了载体旋转对GPS载波相位和频率的影响,研究了旋转状态下接收机跟踪环路的性能。仿真结果表明：为了减少旋转引入的动态应力误差,保持对GPS载波相位的稳定跟踪,必须相应的增大接收机跟踪环路的带宽,且旋转状态下二阶环路的跟踪性能要好于三阶环路。

GPS signal tracking performance in spinning state

In spinning vehicles, it is easy to provide stable and continuous signal-receiving with cylindrically conformal microstrip antennas. But the received signal has suffered the modulated effect induced by spinning vehicles and sets higher requirements for GPS receiver tracking loops. By considering the phase center offset of cylindrically conformal microstrip antenna, the effects of spinning vehicles on GPS carrier phase and frequency is analyzed, and the performance of receiver tracking loop in spinning state is studied. The simulation results illustrate that: in order to reduce the dynamic stress error induced by spinning vehicles and stably track the GPS carrier phase, the receiver tracking loop bandwidth must be increased. The performance of two-order tracking loop is better than that of three-order tracking loop in spinning state.