摘要
星载原子钟是全球导航卫星系统的核心设备之一,其性能及钟差预报精度直接决定着导航定位授时服务的精度。针对卫星钟差组合预报技术中子模型权值难以确定的问题,将熵权法引入到北斗卫星钟差组合预报中。对卫星钟差数据中的粗差、钟跳等异常值进行相频域组合探测,并使用滑动拉格朗日内插法进行修补,得到“干净”钟差序列。以灰色模型和二次多项式模型作为基础模型,构建基于信息熵这一新的评价指标的钟差组合模型,建立北斗卫星钟差熵权组合预报模型。使用武汉大学IGS数据中心发布的北斗精密钟差数据产品,分别进行了连续多天的短期预报和中长期预报试验,多天的平均试验结果验证了熵权组合模型在北斗卫星钟差预报精度和稳定性方面较传统组合模型均存在一定优势。
On-board atomic clock is one of the core equipment of navigation satellite system.Its performance and clock bias prediction accuracy directly determine the accuracy of navigation and positioning timing services.Aiming at the problem that it is difficult to determine the weight of the neutron model of the satellite clock bias combined forecast model,the entropy weight method is introduced into the Beidou satellite clock bias combined forecast.Perform phase-frequency combined detection of outliers such as gross errors and clock jumps in satellite clock bias data,and use sliding Lagrangian interpolation to repair them to obtain a“clean”clock bias sequence.Based on the grey model and the quadratic polynomial model,a combination model of clock bias based on information entropy,a new evaluation index,is constructed,and a combined forecast model of Beidou satellite clock bias entropy weight is established.Using the Beidou precision clock bias data product released by the IGS Data Center of Wuhan University,the short term forecast and medium-long term forecast experiments are carried out for multiple consecutive days.The multi-day average test results verify that the entropy weight combination model has certain advantages over the traditional combination model in terms of the accuracy and stability of the Beidou satellite clock bias prediction.
作者
梅长松
李天智
李铭
程昊
尹永珍
孔祥文
MEI Chang-song;LI Tian-zhi;LI Ming;CHENG Hao;YIN Yong-zhen;KONG Xiang-wen(Yangtze Ecology and Environment Co.,Ltd.,Wuhan,Hubei 430000,China)
出处
《计量学报》
CSCD
北大核心
2022年第9期1208-1215,共8页
Acta Metrologica Sinica
基金
三峡集团长江大保护项目(WWKY-2020-0045)。
关键词
计量学
卫星钟差
组合预报
北斗卫星
熵权法
metrology
satellite clock bias
combined forecast
Beidou satellite
entropy weight method
作者简介
第一作者:梅长松(1996-),男,安徽宿松人,中国地质大学(武汉)硕士研究生,研究方向为测绘数据处理与卫星钟差建模预报。Email:mei_changsong@ctg.com.cn。
