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Error Correction Method for Stellar Imaging Based on Quasi-Ellipse Model

A technology of star imaging and error correction, applied in measurement devices, instruments, etc., can solve the problems of lack, imaging error, high coupling, etc., to achieve the effect of improving accuracy and eliminating high coupling

Active Publication Date: 2020-04-17
SUZHOU ZHONGKE IMAGE SKY REMOTE SENSING TECH CO LTD
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Problems solved by technology

[0005] Therefore, there is a lack of a star imaging error correction method in the prior art, which can process the star image error based on the satellite orbit characteristics and solve the problem of high coupling of imaging errors

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  • Error Correction Method for Stellar Imaging Based on Quasi-Ellipse Model
  • Error Correction Method for Stellar Imaging Based on Quasi-Ellipse Model
  • Error Correction Method for Stellar Imaging Based on Quasi-Ellipse Model

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Embodiment Construction

[0035] In order to enable those skilled in the art to better understand the technical solutions of the present invention, the present invention will be further described in detail below in conjunction with specific embodiments.

[0036] The embodiment of the present invention provides a star imaging error correction method based on the ellipse-like model, the flow chart is as follows figure 1 shown, including:

[0037]S1. Firstly, the canny operator edge extraction is performed on the initial image in the star sensor imaging data to obtain the star point extraction result. On this basis, the continuous multi-frame image is superimposed to obtain a time series superimposed star map.

[0038] S2. According to the time series superimposing the image square star point on the star map, establish the relative motion trajectory equation formed by the image square star point, and according to the relative motion trajectory equation, establish the image based on the elliptical orbit of...

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Abstract

The invention discloses a fixed star imaging error correcting method based on an ellipse-like model, and relates to the technical field of photogrammetry. According to the method, stellar astrologicalerrors based on satellite orbital characteristics can be processed and the problem of high coupling property of imaging errors is solved. The fixed star imaging error correcting method comprises thefollowing steps: carrying out time sequence superposition in the preliminary star point extraction result of star sensor imaging data; establishing a relative motion trajectory equation formed by image space star points and then establishing an image space error ellipse-like fitting model based on an elliptical orbit of a satellite platform, screening intersectant ambiguous solutions of an ellipse-like equation by utilizing multiple parameters and carrying out geometric error correction on the star sensor image space star points; resolving modified picpointed coordinates. According to the starimaging error correcting method disclosed by the invention, the ellipse-like model is established for modifying the errors of the fixed star image points, so that the high coupling property of multiple errors in the dynamic imaging process is effectively eliminated, gross error of an image point observation value is removed and the accuracy of the fixed star image point coordinates can be effectively improved.

Description

technical field [0001] The invention relates to the technical field of photogrammetry, in particular to a star imaging error correction method based on an ellipse-like model. Background technique [0002] The star sensor is an electronic measurement system with the star as the measurement object and the photodetector as the core component. Through the detection of the star, the three-axis attitude of the carrier is measured. Due to its strong autonomy, good concealment, high reliability and high precision, it has become an important attitude measurement instrument in the aerospace field, and is widely used in earth observation satellites and space exploration vehicles. In recent years, with the rapid development of aerospace technology, high-precision dynamic attitude measurement of aircraft has become more and more important for space target monitoring and ground-to-earth cooperative observation constellations. However, the star sensor will introduce complex imaging errors...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01C25/00
CPCG01C25/00
Inventor 王博周维盛庆红高语阳
Owner SUZHOU ZHONGKE IMAGE SKY REMOTE SENSING TECH CO LTD
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