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Ephemeris correction method and device

A technology for ephemeris and error correction, applied in measurement devices, satellite radio beacon positioning systems, instruments, etc., can solve problems such as prediction errors, inability to improve capture efficiency, and increase in prediction errors, and achieve the effect of improving efficiency

Active Publication Date: 2018-10-23
CHINA TELECOM CORP LTD
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Problems solved by technology

[0004] However, the validity period of the ephemeris is generally only 4 hours. When the validity period is exceeded, the prediction error of the ephemeris to the satellite position and Doppler will increase significantly, resulting in inaccurate predictions. Seriously, it can make prediction errors and not only fail to improve capture efficiency, but will lead to capture failure
In addition, the acquisition time of ephemeris is relatively long, for example, for GPS (Global Positioning System, global positioning system) L1 C / A code signal, the acquisition of its ephemeris needs at least 30s

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Embodiment Construction

[0049] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. The following description of at least one exemplary embodiment is merely illustrative in nature and in no way taken as limiting the invention, its application or uses. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.

[0050] The relative arrangements of components and steps, numerical expressions and numerical values ​​set forth in these embodiments do not limit the scope of the present invention unless specifically stated otherwise.

[0051] At the same time, it should be understood that, for the convenience of d...

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Abstract

The present invention discloses an ephemeris correction method and apparatus. The ephemeris correction method includes the steps as follows: confirming the current local time; calculating out the ephemeris time difference between the current local time and the ephemeris emission time; judging whether the ephemeris time difference is greater than a predetermined time difference threshold or not; calculating out the current satellite position by utilizing the current local time if the ephemeris time difference is greater than the predetermined time difference threshold; correcting an error trend term coefficient by utilizing the ephemeris time difference, the ephemeris error angular frequency of the current satellite and the ephemeris so as to acquire the ephemeris correction information; and correcting the current satellite position by utilizing the ephemeris correction information. The ephemeris correction method and apparatus enable the ephemeris to get rid of validity period restriction, realize validity for a long time, and increase the efficiency of ephemeris assist of a receiver.

Description

technical field [0001] The invention relates to the field of location services, in particular to an ephemeris correction method and device. Background technique [0002] The original intention of the ephemeris is to draw a table that accurately describes the space position and speed of the satellite at each moment. However, since the speed of the satellite in space above the earth can reach up to more than 900 meters per second, if the satellite broadcasts its own position in real time And speed will generate a large amount of data, in order to reduce the amount of data transmission, the satellite navigation system uses the Kepler equation to describe the orbit of the satellite. The ground monitoring part of the satellite navigation system determines the orbit of the satellite by continuously receiving and measuring the signals emitted by the satellite, and then uses the least square method to approximate each coefficient in the equation to calculate a set of orbit parameter...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01S19/27
Inventor 谢鑫
Owner CHINA TELECOM CORP LTD
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