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Method for Measuring Earth Orientation Parameters Using Three-Field Single-Focus Optical Telescope

A technology of earth orientation parameters and telescopes, which is applied in telescopes, optics, optical components, etc., and can solve problems such as the inability to measure the earth orientation parameters from the observation data of a single device.

Active Publication Date: 2022-02-08
SHANGHAI ASTRONOMICAL OBSERVATORY CHINESE ACAD OF SCI
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Problems solved by technology

[0003] Purpose of the invention: The present invention provides a method for measuring the orientation parameters of the earth using a three-field single-focal plane optical telescope, which solves the problem that the existing data processing technology can only process single-field observation images and cannot be measured by a single device observation data Problems with Earth Orientation Parameters

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  • Method for Measuring Earth Orientation Parameters Using Three-Field Single-Focus Optical Telescope
  • Method for Measuring Earth Orientation Parameters Using Three-Field Single-Focus Optical Telescope
  • Method for Measuring Earth Orientation Parameters Using Three-Field Single-Focus Optical Telescope

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Embodiment 1

[0075] Embodiment 1: A method for measuring the earth orientation parameter by using a three-field single-focal-plane optical telescope.

[0076] Such as figure 1 As shown, the three-field single-focus optical telescope is to install a reflector with three reflective surfaces in front of the optical telescope. The angle between each of the three reflective surfaces is 135 degrees. The single lens barrel of the optical telescope receives The light of stars in three different sky areas is imaged on the same focal plane detector, and finally three star images in different fields of view are acquired at the same time.

[0077] Utilize the above-mentioned method for measuring the earth orientation parameter with the single focal plane optical telescope of three fields of view, such as figure 2 Shown, including astrology extraction-separation of different fields of view-star matching-pointing calculation-earth orientation parameter calculation. Among them, astrology extraction, s...

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Abstract

The invention discloses a method for measuring earth orientation parameters by using a three-field single-focal plane optical telescope, which comprises the following steps: (1) extraction of astrology; (2) separation of different fields of view; (4) pointing calculation; (5) earth Orientation parameter calculations, including earth rotation axis orientation, pole shift and UT1 calculations. The present invention obtains star images of three different fields of view at the same time through the photographic observation of an optical telescope with a single focal plane of three fields of view; Through continuous multi-frame images, the direction of the instantaneous celestial pole within the observation period is obtained by fitting, and the instantaneous celestial pole reflects the precession and nutation; according to the change of longitude and latitude between different field of view points, the pole shift information is obtained; based on the principle of contour observation, Calculate the zenith direction of the telescope, that is, the right ascension and declination, and the right ascension is the local sidereal time, so as to obtain the universal time UT1 information.

Description

technical field [0001] The invention belongs to the technical field of astronomical optical photography and astrometry, and relates to a method for processing astronomical observation data. Background technique [0002] Earth orientation parameters (precession nutation, pole shift, universal time UT1) are used to describe the irregular changes of the earth in inertial space, and are important parameters in space science and earth science. In the past, classic instruments (such as contour instruments, zenith tubes, meridian rings, and transit instruments) required large-scale network deployment, and each instrument could only observe one field of view or one star at a time, and ultimately could only provide multi-day Averaging results at time resolution. Using an optical telescope with a single focal plane of three fields of view, a method for instantaneously measuring the orientation parameters of the earth can be realized. In order to achieve the two conditions of "simult...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01C15/00G01V8/14G02B23/02G02B23/12
CPCG01C15/00G01V8/14G02B23/02G02B23/12
Inventor 于涌齐朝祥赵铭唐正宏黄乘利孙立早孙中苗曾安敏
Owner SHANGHAI ASTRONOMICAL OBSERVATORY CHINESE ACAD OF SCI