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An orientation method for digital zenith instrument based on projection transformation

A technology of projection transformation and zenith instrument, which is applied in the directions of instruments, measuring instruments, astronomical navigation, etc., and can solve the problem that there is no special research report on the orientation method of digital zenith instrument.

Active Publication Date: 2021-08-20
ROCKET FORCE UNIV OF ENG
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  • Application Information

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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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  • An orientation method for digital zenith instrument based on projection transformation
  • An orientation method for digital zenith instrument based on projection transformation
  • An orientation method for digital zenith instrument 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, which adopts a general-purpose digital zenith instrument with a star map and software system for identification and positioning, and is characterized in that it includes four steps: measuring the astronomical position of the zenith instrument. Coordinates; Construct the projection model of stellar coordinates; Calculation of azimuth; Correction of azimuth A. Compared with the existing technology, it is less affected by the parameters of the optical system, and can accurately calculate the orientation even if the optical system is not calibrated, which saves the very difficult process of calibrating the focal length, distortion and other optical system parameters, and will not Because it will be affected by external factors, it will change accordingly over time, and the azimuth of the zenith instrument can be determined only through astronomical observation, and the azimuth output can realize the rapid orientation of the station, and has strong environmental adaptability. Experimental verification shows that the orientation accuracy that the present invention can complete with high precision is within 8", fully meeting the requirements for orientation accuracy in actual work.

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 Patents(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