摘要
采用频谱分析方法对BDS星载原子钟的周期项变化规律进行分析,继而构建了附有周期项的精密钟差预报模型。在此基础上,对预报模型的短期预报效果和不同类型卫星的预报精度差异进行分析。结果表明,不同类型的卫星均表现出较为显著的12h和24h的周期项变化规律,但其对应的能量幅值存在差异;与传统的二次多项式预报模型相比,结合周期项改正的钟差预报模型能够提高预报精度,6h的预报精度约为2ns,24h的预报精度约为10ns。
The periodicity of BDS satellite clocks is analysed using the Fourier transformation method, and then we build the forcast model considering periodic term. On this basis, we analyze the short- term forecast effect and forecast precision of different types of satellites. Experimental results show that different types of satellites show more significant half-day and one-day period terms, and the cor- responding energy amplitudes are different. Compared with the traditional quadratic polynomial fore- cast model, the proposed model can significantly improve prediction accuracy. The overall accuracy of 6 h prediction can be better than 2 ns and 24 h prediction accuracy better than 10 ns.
出处
《大地测量与地球动力学》
CSCD
北大核心
2017年第3期292-296,共5页
Journal of Geodesy and Geodynamics
关键词
BDS
星载原子钟
频谱分析
周期项
钟差预报
BDS
satellite atomic clock
spectrum analysis
periodic term
clock offset prediction
作者简介
马卓希，助理工程师，研究方向为GNSS理论与数据处理，Email：mzhx_1991@163．com.
