Patent
Satellite clock error resolving and forecasting method based on real-time data flow
Zhai Wei,Sun Cunguang +1 more
- 22 Jun 2018
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TL;DR: In this article, a satellite clock error resolving and forecasting method based on real-time data flow is proposed, which has the characteristics of high response speed and high forecasting precision, but it is not suitable for high-dimensional data.
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Abstract: The invention provides a satellite clock error resolving and forecasting method based on real-time data flow. The satellite clock error resolving and forecasting method based on real-time data flow comprises the following steps: preprocessing observation data of the real-time data flow; establishing a non-difference model and an inter-epoch difference model according to pseudorange, carrier wave and phase smooth pseudorange observation value after data preprocessing, taking a plurality of epoch convection zone parameter estimations as prior information, and carrying out initial estimation in real time to obtain clock error estimation information; acquiring a reference condition by using broadcasted clock error data, and restraining a clock error estimated reference to obtain resolved clockerror data; and separately storing the read resolved clock error data and the broadcasted clock error data to obtain real-time resolving clock error, a broadcasted clock error and a model parameter,selecting the broadcasted error which corresponds to the real-time forecasted clock error, detecting and rejecting gross errors of the real-time clock error data, and carrying out clock error forecasting on data without gross errors by using a linear polynomial fitting model. The satellite clock error resolving and forecasting method based on real-time data flow has the characteristics of high response speed and high forecasting precision.
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Citations
Patent
Ground precise single-point positioning data processing method
Zhang Wei,Li Ying,Liang Ertao,Cheng Yi,Gu Guihua,Song Tao,Zhang Liguo +6 more
- 21 May 2019
TL;DR: In this paper, a ground precise single-point positioning data processing method is proposed, which comprises the following steps that S1, cycle slip gross error detection correction is conducted on observation data of a GNSS receiver; S2, a carrier phase observation value and a pseudo code observation value are smoothed; S3, after Lagrange interpolation is carried out by utilizing the received GNSS precise ephemeris broadcasted by the low-orbit satellite, the GNSS broadcast ephemeri error ephemerI error is corrected; and S4, errors such as troposphere
3
Patent
Real-time clock deviation prediction method and device, and computer equipment
Dai Zhiqiang,Ge Maorong,Bao Zhixiong,Li Chenggang,Shi Xiaoyu,Zuo Xiang +5 more
- 25 Oct 2019
TL;DR: In this article, the authors proposed a real-time clock deviation prediction method based on a reference station network, where the clock deviation of an epoch is predicted using a sliding window model.
2
Patent
Global navigation satellite system real-time clock error evaluation algorithm
Chen Guo,Zhao Qile,Chen Zhuomin +2 more
- 06 May 2021
TL;DR: In this article, a GNSS real-time clock error evaluation algorithm is presented, where a median gross error detection method and a total variation regularization method are used to detect the abnormal data in the real time clock error.
Patent
Novel GNSS ultra-fast clock error forecasting method
Xu Tianhe,Huijie Xue,Sun Zhangzhen,Jiang Nan,Qingsong Ai +4 more
- 12 Jun 2020
TL;DR: In this paper, a novel GNSS (Global Navigation Satellite System) ultra-fast clock error forecasting method was proposed, which improved the current situation that the existing GNSS clock error forecast method is lower in clock error real-time forecasting precision and poorer in stability, and comprises the following steps of: preprocessing clock error data; performing principal component analysis on the clock errors; respectively carrying out modeling prediction on the main components and the total residual error sequence; obtaining a final forecast value.
Patent
Method for estimating clock deviation of satellite navigation timing receiver
Li Zhiqiang,Yu Yong +1 more
- 17 Jan 2020
TL;DR: In this paper, a method for estimating the clock deviation of a satellite navigation timing receiver is presented, which includes the steps of polynomial fitting, model simplification and matrix solution.
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Patent
High-frequency clock error estimation method of satellite navigation system
Chen Zhi,Zhang Xiaoqiang,Zhang Xuehui,Song Yang +3 more
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TL;DR: In this article, a high-frequency clock error estimation method of a satellite navigation system was proposed, which includes acquiring observed data of a tracking station; testing the reliability of the observed data; rejecting outliers from the observed observations after reliability test by using linear combination of the observation quantity, determining an initial ambiguity, detecting and repairing the cycle slip, and obtaining codes and phase observed values; acquiring a satellite obit parameter, an earth polar motion parameter, a troposphere parameter, and a station coordinate parameter; obtaining clock error estimated values of the satellite and a receiver according to original
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Patent
Multi-constellation single base station receiver clock difference estimation method
Pan Shuguo,Wang Qing,Wang Denghui,Yang Yang +3 more
- 10 Jul 2013
TL;DR: In this article, a multi-constellation single base station receiver clock difference estimation method was proposed to reduce the effect of the receiver clock differences which are related to the satellite speed to a submillimeter level.
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Patent
Real-time precise satellite clock error estimation method not impacted by deviation of code frequency of GLONASS
Liu Zhiqiang,Zheng Dehua,Yue Dongjie,Huang Zhangyu,Cao Qi,Wang Hai,Chen Shangdeng +6 more
- 13 May 2015
TL;DR: In this article, a real-time precise satellite clock error estimation method not impacted by the deviation of code frequency of GLONASS, the GPS, and the satellite clock estimation is executed by the GNSS reference station network, a plurality of independent time-frequency error parameters are set in the function model for absorbing the deviation.
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