GNSS precise time transmission method based on constraint of fixed solution of double-difference ambiguity

A double-difference ambiguity, precise time technology, applied in satellite radio beacon positioning systems, measuring devices, instruments, etc., can solve problems such as poor time transfer accuracy and reliability

Active Publication Date: 2018-08-24
ACAD OF MATHEMATICS & SYSTEMS SCIENCE - CHINESE ACAD OF SCI
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[0004] The purpose of the present invention is to propose a GNSS precise time transfer method based on double-difference ambiguity fixed s

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  • GNSS precise time transmission method based on constraint of fixed solution of double-difference ambiguity
  • GNSS precise time transmission method based on constraint of fixed solution of double-difference ambiguity
  • GNSS precise time transmission method based on constraint of fixed solution of double-difference ambiguity

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[0081] In order to make the purpose, content, and advantages of the present invention clearer, the specific implementation manners of the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments.

[0082] This embodiment proposes a GNSS precise time transfer method based on double-difference ambiguity fixed solution constraints. The system used in this method is as follows figure 1 shown. The system consists of a GNSS receiver, a data communication link and a data processing center. The GNSS receiver can receive and process GNSS signals, and output GNSS dual-frequency pseudo-range, carrier observations and ephemeris data; the data communication link combines GNSS observations and star The calendar data is transmitted to the data processing center; after the data processing center completes the data processing, the relative clock difference results of the two GNSS receivers are obtained.

[0083] The GNSS precise...

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Abstract

The invention relates to a GNSS precise time transmission method based on constraint of a fixed solution of a double-difference ambiguity, and belongs to the technical field of precise time service, time synchronization and time frequency transmission. The GNSS precise time transmission method comprises that an inter-station single-difference observation module calculates a relative clock error ofa GNSS receiver; single-difference ambiguity is projected into double-difference ambiguity, and the double-difference ambiguity is fixed; and a relative clock error of the receiver is calculated based on constraint of the fixed solution of the double-difference ambiguity. The GNSS pseudo range and a carrier phase observation value are used, and the inter-station single-difference observation module is utilized to estimate the relative clock error of the receiver. On such basis, the single-difference ambiguity is projected into double-difference ambiguity, and the double-difference ambiguity is fixed. The fixed double-difference ambiguity serves as a constraint condition, the precision of a floating point solution of the single-difference ambiguity is improved, and the time transmission precision and reliability are improved.

Description

technical field [0001] The invention belongs to the technical field of precision timing, time synchronization and time-frequency transmission, and in particular relates to a GNSS precision time transmission method based on double-difference ambiguity fixed solution constraints. Background technique [0002] High-precision time-frequency technology is an important technical support for a country, and it is widely used in national defense, military, aerospace, modern communications, power transmission and distribution, financial securities, measurement and testing and other fields. GNSS has broad application and development prospects in the field of precision time transfer. In GNSS carrier phase precision time transfer, due to the existence of hardware delay and phase deviation at the satellite end and receiver end, the non-difference and single-difference ambiguities do not have integer characteristics. , so it is difficult to fix. In the existing GNSS carrier phase precisio...

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Application Information

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IPC IPC(8): G01S19/44G01S19/25
CPCG01S19/256G01S19/44
Inventor 吕金虎张明武春风谢高岗张强
Owner ACAD OF MATHEMATICS & SYSTEMS SCIENCE - CHINESE ACAD OF SCI
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