Analysis of Disciplined Crystal Oscillator Method Based on GNSS
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摘要: 高稳定度、高准确度的频标在计量测试、测控通信、电信电力、金融等领域至关重要。GNSS驯服晶振结合了GNSS具有较高长期稳定度和晶振具有较高短期稳定度的优点,加之成本较低,获得了广泛应用。本文针对GNSS驯服晶振的特点,对比分析了最小二乘法、无偏滑动平均滤波法、Kalman滤波法等几种主要的晶振驯服滤波方法,并利用相同控制方法进行驯服仿真比对,给出了几种滤波方法的驯服性能差异,分析了其优缺点。本文可以为驯服晶振在GNSS授时接收机的应用提供技术借鉴。Abstract: Contrast to the huge demand in measurement and testing, monitoring and communication, telecommunications and electricity and finance, a standard frequency source of high stability and high precision is crucial. GNSS disciplined crystal oscillator has combined the advantages of GNSS pulse per second signal which has good longterm stability. So GNSS disciplined crystal oscillator is widely applied for its high precision and low cost. In this paper, least squares algorithm, unbiased moving average filtering and Kalman filtering have been analyzed and compared.Those main filtering methods was applied to crystal oscillators which controlled in the same way.Their advantages and shortcomings have also been summed in this paper. Some meaningful suggestions are provided for the use of disciplined crystal oscillator in GNSS timing receiver.
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Key words:
- GNSS /
- disciplined crystals oscillator /
- Least Square /
- Kalman filtering
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