晶振误差特性及其对弹载卫星导航接收机的影响分析

Analysis on Crystal Oscillator Error Characteristics and Its Effect on Missile Borne Satellite Receiver

在卫星导航定位中,需要通过测量时间来计算伪距和伪距率,因此晶振的应用尤为重要。特别是当弹载卫星接收机工作在振动、高动态等恶劣的工作环境中时,晶振性能会明显恶化。提出了晶振长期稳定性、短期稳定性、相位噪声等误差特性的描述,以及这些误差特性对接收机捕获、跟踪、定位测速影响的仿真分析,并根据仿真结果提出了相应的晶振选型分析和应用方法,以使卫星导航接收机能够满足其工作要求。

In the satellite navigation and positioning system, the pseudorange and pseudorange rate need to be calculated by measuring the time, so the application of the crystal oscitlator is particu- larly important. Especially when the missile borne satellite receiver works in vibration, high dy- namic and other harsh working environment, the performance of the crystal oscillator will be sig- nificantly worse. The paper describes error characteristics such as long-term stability, short-term stability and phase noise. And the effects of these error characteristics on acquisition, tracking and positioning accuracy are simulated and analyzed. According to the simulation results, the paper proposes relevant choosing analysis and application methods, in this way, the satellite navigation receivers can meet working requirements.