北斗广播电文钟差模型精度评估及改善策略

星载原子钟是北斗卫星导航系统（BDS）的核心设备，其钟差模型是北斗广播电文的重要组成部分，模型精度直接影响BDS的服务性能。本文采用星地双向时频传递（TWSTF）钟差测量为参考，评估了BDS广播电文钟差模型精度，结果表明BDS广播电文钟差模型精度优于2 ns（数据龄期小于12 h）。针对BDS广播电文钟差参数解算问题，结合BDS地面段的钟差模型解算策略，本文提出进一步提升精度的多种策略。对于1 h时长的短期预报，本文提出加权线性模型与混合区间线性模型的钟差拟合预报方法，短期预报精度可提高20%以上；对于预报时长大于6 h的中长期预报，本文采用谱分析钟差时间序列，并根据谱分析结果构造预报模型，与...

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Published in:Ce hui xue bao 2021-02, Vol.50 (2), p.181
Main Authors: 巩秀强, 袁俊军, 胡小工, 王彬, 陈俊平, 周善石
Format: Article
Language:chi ; eng
Subjects:
Accuracy
Atomic clocks
BeiDou Navigation Satellite System
Error analysis
Mathematical models
Model accuracy
Navigation systems
Parameter estimation
Polynomials
Prediction models
Satellite navigation systems
Spectral analysis
Spectral methods
Spectrum analysis
Time series
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container_end_page
container_issue 2
container_start_page 181
container_title Ce hui xue bao
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creator 巩秀强
袁俊军
胡小工
王彬
陈俊平
周善石
description 星载原子钟是北斗卫星导航系统（BDS）的核心设备，其钟差模型是北斗广播电文的重要组成部分，模型精度直接影响BDS的服务性能。本文采用星地双向时频传递（TWSTF）钟差测量为参考，评估了BDS广播电文钟差模型精度，结果表明BDS广播电文钟差模型精度优于2 ns（数据龄期小于12 h）。针对BDS广播电文钟差参数解算问题，结合BDS地面段的钟差模型解算策略，本文提出进一步提升精度的多种策略。对于1 h时长的短期预报，本文提出加权线性模型与混合区间线性模型的钟差拟合预报方法，短期预报精度可提高20%以上；对于预报时长大于6 h的中长期预报，本文采用谱分析钟差时间序列，并根据谱分析结果构造预报模型，与简单的二次多项式模型预报相比，预报6 h精度提高13%，预报12 h平均提高了21%；对于IGSO/MEO卫星，本文提出将TWSTF的设备时延值作为参数估算，使钟差模型在设备切换后精度提高18%。最后，利用本文提出的改进策略对2017年1月-6月的钟差数据重新处理，获得了新的广播电文钟差模型时间序列。利用新的广播电文钟差模型进行北斗监测接收机定位，结果表明，N、E、U 3个方向精度分别提高14.22%、29.39%、14.91%，显著提升了BDS广播电文钟差服务性能。
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subjects Accuracy
Atomic clocks
BeiDou Navigation Satellite System
Error analysis
Mathematical models
Model accuracy
Navigation systems
Parameter estimation
Polynomials
Prediction models
Satellite navigation systems
Spectral analysis
Spectral methods
Spectrum analysis
Time series
title 北斗广播电文钟差模型精度评估及改善策略
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