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Method for improving time service precision of eLoran system by using ASF grid and differential station

A differential station and grid technology, applied in the field of communications, can solve problems such as GNSS system gaps

Active Publication Date: 2021-04-09
NAT TIME SERVICE CENT CHINESE ACAD OF SCI
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  • Application Information

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Problems solved by technology

The differential station significantly improves the accuracy of the eLoran system, but there is still some gap with the GNSS system

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  • Method for improving time service precision of eLoran system by using ASF grid and differential station
  • Method for improving time service precision of eLoran system by using ASF grid and differential station
  • Method for improving time service precision of eLoran system by using ASF grid and differential station

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Embodiment Construction

[0030] 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.

[0031] The invention provides an ASF (Added secondary Factor) grid of the eLoran (Enhanced LongRange Navigation) system established by using the inverse operation of the bilinear interpolation algorithm, and the user uses the differential information of the ASF grid and the differential station to work together from time and space The latitude corrects the propagation delay of the received signal, thereby improving the timing accuracy of the eLoran system.

[0032] The idea of ​​the present invention is: the differential station must have a standard time-frequency signal, measure the real-time time difference, calculate the differential correction number model and broadcast it to the surrounding users; firstly, use the dynamic measurement data and the inverse bilinear interp...

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Abstract

The invention provides a method for improving the time service precision of an eLoran system by using an ASF grid and a differential station, and the method comprises the steps: enabling the differential station to carry out the real-time time difference measurement, calculating a differential correction model, and transmitting the differential correction model to surrounding users; establishing an ASF grid database by utilizing the dynamic measurement data and an inverse bilinear interpolation algorithm; enabling the user to calculate own one-time delay, and calculate a difference correction number according to the difference information to obtain a time component of the ASF; secondly, searching for a grid where the ASF is located, and calculating spatial components of the ASF according to the position information and ASF values of four vertexes of the grid; and finally, correcting the signal propagation time delay by using the time component and the space component to obtain more accurate signal propagation time delay, thereby improving the time service precision of the system.

Description

technical field [0001] The invention belongs to the technical field of communication and relates to a timing method. Background technique [0002] With the deepening and wide application of the GNSS system, its vulnerability is gradually exposed. The eLoran system is selected as the backup system of the GNSS system due to its advantages of good signal stability, high reliability, strong anti-interference, and long propagation distance; but in In terms of accuracy, there is a certain gap between the eLoran system and the GNSS system. Experts and scholars from various countries have begun to study methods to improve the accuracy of the eLoran system. Among them, the ASF grid improves the accuracy of eLoran from the spatial dimension, and can achieve a timing accuracy better than 200ns; the differential station improves the timing accuracy of the eLoran system in the time dimension, which is close to 100ns. The differential station has significantly improved the accuracy of t...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L7/00H04J3/06
CPCH04L7/002H04J3/0638H04J3/0682
Inventor 李云燕保荣郭伟华宇
Owner NAT TIME SERVICE CENT CHINESE ACAD OF SCI