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Real-time UTC (k) time comparison method based on relative hardware delay calibration

A technology of hardware delay and time comparison, applied in the field of satellite navigation, to achieve good flexibility, unified calibration, and good real-time effects

Active Publication Date: 2022-07-15
BEIHANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, it is the relative hardware delay between stations that affects the PPP time transfer results

Method used

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  • Real-time UTC (k) time comparison method based on relative hardware delay calibration
  • Real-time UTC (k) time comparison method based on relative hardware delay calibration
  • Real-time UTC (k) time comparison method based on relative hardware delay calibration

Examples

Experimental program
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Effect test

Embodiment 1

[0093] Select a punctuality laboratory with an external atomic clock, connect two receivers to the same time and frequency source, and through post-event PPP processing, obtain the clock difference of the two receivers as dt respectively k1 and dt k2 . Since the local clock in the receiver clock error includes the hardware delay deviation δ caused by the existence of the hardware delay of the receiver and the cable k1 and δ k2 , the difference dt of the clock difference between the two receivers k1 -dt k2 That is, the relative hardware delay caused by the two receivers and cables.

[0094] The above two receivers are respectively placed in the time laboratories A and B connected to the atomic clocks. Based on the WPT time service platform, the clock errors of the receivers under the corresponding clock error benchmarks of the time laboratories A and B are estimated in real time. At this time, the two receivers are Receiver clock difference difference dt utc(k1) -dt utc(...

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Abstract

The invention discloses a real-time UTC (k) comparison method based on relative hardware delay calibration, and the method comprises the steps: obtaining the relative hardware delay deviation caused by two receivers and a cable through calculating the clock error data of the two receivers connected to the same time frequency source, and carrying out the calibration of the two calibrated receivers in different time laboratories based on a WPT time service platform, according to the method, the clock difference of receivers of two stations is obtained through real-time PPP processing, relative hardware delay is deducted, and then the real-time UTC (k) time comparison result is obtained, so that the influence of the hardware delay on UTC (k) time comparison based on the PPP method is eliminated, the availability of the system is greatly improved under the condition that the real-time performance is ensured, and the method has wide application prospects in time synchronization and high-precision positioning.

Description

technical field [0001] The invention belongs to the technical field of satellite navigation, and in particular relates to a real-time UTC(k) time comparison method based on relative hardware delay calibration. Background technique [0002] Time is one of the seven basic physical quantities, which is of great significance to the fields of daily life, scientific research and engineering construction. In order to ensure the consistency of time reference, the International Bureau of Weights and Measures (Bureau International des Poids et Mesures, BIPM) integrates the local time (UTC(k)) maintained in real time by more than 80 time laboratories around the world, and finally generates Coordinated Universal Time (Coordinated Universal Time, UTC). Therefore, accurate UTC(k) time comparison results are a prerequisite for maintaining UTC. [0003] The traditional methods of high-precision time transfer, including optical fiber time transfer and satellite two-way time transfer, have ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G04R20/02G04R20/04
CPCG04R20/02G04R20/04
Inventor 施闯王梦郑福张东
Owner BEIHANG UNIV