Precise-point-positioning-based real-time time transfer method

A precise single-point positioning and time transfer technology, applied in transmission systems, digital transmission systems, synchronization error correction and other directions, can solve the problem that the navigation satellite system cannot meet the real-time time transfer in nanoseconds

Inactive Publication Date: 2017-06-13
BEIJING INST OF RADIO METROLOGY & MEASUREMENT
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Problems solved by technology

[0007] The purpose of the present invention is to provide a real-time time transfer method based on precise single point positioning technology, which is used to solve the problem that the current navigation satellite system cannot meet the nanosecond level real-time time transfer

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[0038] In order to illustrate the present invention more clearly, the present invention will be further described below in conjunction with preferred embodiments and accompanying drawings. Similar parts in the figures are denoted by the same reference numerals. Those skilled in the art should understand that the content specifically described below is illustrative rather than restrictive, and should not limit the protection scope of the present invention.

[0039] The present invention uses the real-time ephemeris and star clock data broadcasted by the network server of the IGS data center to replace the final precision ephemeris and star clock data released after 15 days used in the traditional precision single-point positioning data processing, to perform real-time data processing, and to calculate Local and GNSS time difference. Then, the time difference data of the two stations are exchanged through the wireless communication module, thereby completing the time transfer b...

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Abstract

The invention discloses a precise-point-positioning-based real-time time transfer method. According to the method, carrier phase and pseudorange data of a navigation satellite as well as a broadcasting ephemeris and a broadcasting on-board clock are measured and extracted by a measurement receiver; cycle slip detection and non-difference integer ambiguity resolution are carried out on real-time carrier phase data according to real-time ephemeris and on-board clock revised data broadcast by a network server in an IGS data center to obtain time difference between local time and satellite system time; and data exchange is carried out with a communication module after error correction is performed according to a classical precise point positioning model, thereby realizing real-time time transfer between two stations.

Description

technical field [0001] The present invention relates to a time transfer method. More specifically, it relates to a real-time time transfer method based on precise point positioning. Background technique [0002] In addition to being used for navigation and positioning, the satellite navigation system is also one of the most important ways of timing and time transfer. Time transfer by using Global Navigation Satellite System (GNSS, Global Navigation Satellite System) is currently the most widely used time transfer method. The Global Positioning System (GPS, Global Positioning System) common-view time comparison method was proposed by the United States in the 1980s. Two ground stations, through the GPS receiver connected to the local atomic clock time reference signal, receive the same The time difference between the local time and the on-board clock of the satellite is calculated respectively, and the record is stored in a file. Through file exchange and data processing aft...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L7/00H04J3/06H04B7/185
CPCH04B7/18519H04J3/0638H04L7/002
Inventor 王宏博张升康易航
Owner BEIJING INST OF RADIO METROLOGY & MEASUREMENT
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