Method for calculating earth rotation parameters through observation data of CCD zenith telescope

A technology of earth rotation and observation data, applied in astronomical navigation, navigation calculation tools, etc., can solve the problem of low accuracy

Inactive Publication Date: 2017-01-04
NAT ASTRONOMICAL OBSERVATORIES CHINESE ACAD OF SCI
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Problems solved by technology

Although the ERP measurement results of ground optical instruments are not as accurate as those of new distance-measuring technical instruments, ground o

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  • Method for calculating earth rotation parameters through observation data of CCD zenith telescope
  • Method for calculating earth rotation parameters through observation data of CCD zenith telescope
  • Method for calculating earth rotation parameters through observation data of CCD zenith telescope

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Embodiment Construction

[0048] Such as figure 1 As shown, the data reduction process of using the observation data of the CCD zenith telescope to solve the earth's rotation parameters includes: star image extraction and star image centroid calculation, star apparent position and Greenwich apparent sidereal time calculation, star map recognition, zenith position calculation and Telescope tilt correction.

[0049] The detailed steps are as follows:

[0050] a. Process the stellar map A and B taken by the CCD zenith telescope at two directions of 180 degrees relative to each other, and obtain the coordinates of the stars in the star map (x i ,y i );

[0051] b. Through star map recognition, calculate the equatorial coordinates (α i ,δ i );

[0052] c. Calculate the stars (α i ,δ i ) of the apparent position

[0053] d. View the position of the stars Convert to tangent plane coordinates;

[0054] cot q = ...

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Abstract

The invention discloses a method for calculating earth rotation parameters through observation data of a CCD zenith telescope. The latitude variation and universal time of an observation point are calculated by processing the fixed star maps photographed by the CCD zenith telescope in two positions with relative direction included angle of 180 degrees through the combination of the photographing moments of the two star maps and the astronomical latitude and longitude of the observation point. By means of the method, a technical basis is provided for establishing an autonomous earth rotation parameter measurement system in China through the CCD zenith telescope, and the situation that China excessively depends on the international earth rotation and reference system service organization on the aspect of earth rotation parameter measurement can be relieved.

Description

technical field [0001] The invention relates to the field of astrometry, in particular to a method for calculating the parameters of the earth's rotation. Background technique [0002] Earth rotation parameters (ERP), including pole movement and day length variation (LOD, generally expressed in UT1 universal time). Together with precession and nutation, ERP constitutes the Earth Orientation Parameter (EOP). EOP is an important parameter to realize the conversion between the celestial reference frame and the earth reference frame. Precise orbit determination and navigation of artificial satellites and space vehicles require high-precision earth rotation parameters. Therefore, the observation and research of earth rotation parameters are of great significance. There are already high-precision models for the calculation of precession and nutation, but ERP cannot be calculated using models and can only be obtained through observation. At present, ERP observation is realized t...

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Application Information

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IPC IPC(8): G01C21/02G01C21/20
CPCG01C21/02G01C21/20
Inventor 王博韩延本田立丽
Owner NAT ASTRONOMICAL OBSERVATORIES CHINESE ACAD OF SCI
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