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Digital zenith instrument orientation method based on projection transformation

A technology of projection transformation and zenith instrument, which is applied in the direction of instruments, surveying instruments, astronomical navigation, etc., can solve the problem that there is no special research report on the orientation method of digital zenith instrument, and meet the requirements of orientation accuracy and environmental adaptability Strong, fast directional effects

Active Publication Date: 2019-07-30
ROCKET FORCE UNIV OF ENG
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Problems solved by technology

So far, there are no special research reports on the orientation method of digital zenith instrument at home and abroad

Method used

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  • Digital zenith instrument orientation method based on projection transformation
  • Digital zenith instrument orientation method based on projection transformation
  • Digital zenith instrument orientation method based on projection transformation

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Embodiment Construction

[0042] Now in conjunction with accompanying drawing, the method of the present invention will be further described.

[0043] see figure 1 : the used digital zenith instrument of the present invention is mainly made up of optical telescope, CCD imaging device and rotating platform leveling device; The inventive method specifically comprises the following steps:

[0044] Step 1:: Measure the astronomical coordinates of the location of the Zenith instrument

[0045] Before performing astronomical orientation, first measure the astronomical coordinates of the position of the zenith instrument to obtain higher-precision astronomical coordinates: (α 0 ,δ 0 );

[0046] Step 2: Establish a projection model of the same position and different images

[0047] Step 2.1: Preprocess the captured star map to remove noise;

[0048] Step 2.2: Extract the photo coordinates (x ij ,y ij ) ， And combined with the stellar catalog to identify the captured stars;

[0049] Step 2.3: Calculate...

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Abstract

The invention relates to a digital zenith instrument orientation method based on projection transformation. A universal digital zenith instrument having a star map and identification and positioning solution software system is adopted. The digital zenith instrument orientation method based on projection transformation is characterized by comprising the four steps of: measuring the astronomical coordinate of the position, where the zenith instrument is; constructing a projection model of a star coordinate; calculating an azimuth angle; and correcting the azimuth angle A. Compared with the priorart, influence by parameters of an optical system is low; the azimuth also can be accurately calculated even if the optical system is not calibrated; a process of calibrating the parameters of the optical system, such as the focal length and the distortion, very difficultly can be avoided; the problem that corresponding change occurs along with time due to influence by external factors also can be avoided; furthermore, the azimuth of the zenith instrument can be determined only through astro observation; furthermore, the azimuth is output; rapid orientation of a test site can be realized; theenironmental adaptation is relatively high; an experiment verifies that the orientation precision high precisely completed by the method in the invention is within 8''; and requirements of practicalwork on the orientation precision are completely satisfied.

Description

technical field [0001] The invention belongs to the technical field of geodetic astronomy surveying, and relates to a zenith instrument orientation method, in particular to a projection transformation-based digital zenith instrument orientation method. Background technique [0002] There are three main research institutes at home and abroad on digital zenith technology, the University of Hannover in Germany, the University of Technology Zurich in Switzerland, and the Second Artillery Equipment Research Institute. The software and hardware systems of the digital zenith instruments studied by the three companies are basically similar. The hardware structure is mainly composed of an optical system, an inclination measurement and leveling system, a timing system, a control system and a data processing system. The software system mainly includes star map and identification, calculation of the rotation axis of the zenith instrument and related compensation. In the prior art befor...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01C15/00G01C21/02G01C21/20
CPCG01C15/00G01C21/02G01C21/20
Inventor 张志利周召发刘先一冯磊
Owner ROCKET FORCE UNIV OF ENG
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