Beidou local precise time transfer method based on time laboratory enhanced information

A technology for enhancing information and precise time, applied in satellite radio beacon positioning systems, advanced technology, climate sustainability, etc. Simple and reliable, the effect of improving the level of correction

Active Publication Date: 2020-08-25
NAT TIME SERVICE CENT CHINESE ACAD OF SCI
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  • Abstract
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Problems solved by technology

[0003] The carrier phase precise point positioning (PPP) time transfer method in satellite time transfer has become the current mainstream technology because of its high precision, and has been widely used in many time laboratories; however, the current PPP time transfer method has three limitations: First, many errors in non-difference observations are difficult to deal with efficiently, and the accuracy of time transfer can be further improved; second, conventional PPP time transfer is implemented point-to-point, which cannot meet the concurrent use needs of a large number of users; third, conventional PPP requires professional technology Only personnel and software can achieve high-precision time transfer, and the operation is complicated

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  • Beidou local precise time transfer method based on time laboratory enhanced information
  • Beidou local precise time transfer method based on time laboratory enhanced information
  • Beidou local precise time transfer method based on time laboratory enhanced information

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Embodiment Construction

[0033] The present invention will be further described below in conjunction with the accompanying drawings and embodiments, and the present invention includes but not limited to the following embodiments.

[0034] The Beidou local precision time transfer method based on time laboratory enhanced information mainly includes two core technologies:

[0035] 1) Enhanced information extraction on the Beidou reference station of the time laboratory, the extraction of enhanced information adopts the following observation model:

[0036]

[0037] Among them, P and Φ represent the pseudorange and phase, L is the combined observation value without ionosphere, R is the reference station mark, Cor represents the enhanced information, ρ is the geometric distance between stations and stars, and model is the sum of modeling errors, including troposphere, relativity, Tides, antenna phase center, troposphere and Earth rotation errors.

[0038] 2) The time transfer calculation of the user te...

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Abstract

The invention discloses a Beidou local precise time transfer method based on time laboratory enhanced information. The method comprises the following steps: constructing a Beidou reference station, connecting a receiver clock with a standard time signal of a national timing center time laboratory of the Chinese Academy of Sciences; based on an observation value of a Beidou reference station, extracting and broadcasting Beidou satellite enhancement information containing standard time signals in a network mode, a time user receiving the enhancement information, performing non-differential PPP calculation in combination with collected observation data and a received ephemeris product, obtaining the time difference with a standard clock, and therefore achieving precise time transmission of national standard time. The method provided by the invention can eliminate or weaken common errors, improve the observation value error correction level, improve the time transfer precision, and improvethe correction level of the observation value errors of the user station.

Description

technical field [0001] The invention relates to the technical fields of precision timing, time synchronization and time-frequency transmission, in particular to a Beidou local precision time transmission method based on time laboratory enhanced information. Background technique [0002] Time transfer is an important means to achieve high-precision time synchronization between time users. It has a wide range of application requirements in power networking, 5G communications, financial securities and other industries. The time transfer method based on satellite technology is low in cost, good in continuity, and easy to implement. become one of the important means. [0003] The carrier phase precise point positioning (PPP) time transfer method in satellite time transfer has become the current mainstream technology because of its high precision, and has been widely used in many time laboratories; however, the current PPP time transfer method has three limitations: First, many e...

Claims

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Application Information

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IPC IPC(8): G01S19/03G01S19/25
CPCG01S19/03G01S19/256Y02D30/70
Inventor 涂锐卢晓春张鹏飞张睿韩军强范丽红鲁洋为
Owner NAT TIME SERVICE CENT CHINESE ACAD OF SCI
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