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Least-Square-Method-Based Optimal Laser Spots Acquisition and Position in Cooperative Target Measurement

The relative positioning precisions of coordinate points is an important indicator that affects the final accuracy in the visual measurement system of space cooperative targets. Many factors, such as measurement methods, environmental conditions, data processing principles and equipment parameters,...

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Autores principales: Li, Kai, Yuan, Feng, Hu, Yinghui, Du, Yongbin, Chen, Wei, Lan, Chunyun
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2022
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9317517/
https://www.ncbi.nlm.nih.gov/pubmed/35890797
http://dx.doi.org/10.3390/s22145110
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author Li, Kai
Yuan, Feng
Hu, Yinghui
Du, Yongbin
Chen, Wei
Lan, Chunyun
author_facet Li, Kai
Yuan, Feng
Hu, Yinghui
Du, Yongbin
Chen, Wei
Lan, Chunyun
author_sort Li, Kai
collection PubMed
description The relative positioning precisions of coordinate points is an important indicator that affects the final accuracy in the visual measurement system of space cooperative targets. Many factors, such as measurement methods, environmental conditions, data processing principles and equipment parameters, are supposed to influence the cooperative target’s acquisition and determine the precision of the cooperative target’s position in a ground simulation experiment with laser projected spots on parallel screens. To overcome the precision insufficiencies of cooperative target measurement, the factors of the laser diode supply current and charge couple device (CCD) camera exposure time are studied in this article. On the hypothesis of the optimal experimental conditions, the state equations under the image coordinates’ system that describe the laser spot position’s variation are established. The novel optimizing method is proposed by taking laser spot position as state variables, diode supply current and exposure time as controllable variables, calculating the optimal controllable variables through intersecting the focal spot centroid line and the 3-D surface, and avoiding the inconvenience of solving nonlinear equations. The experiment based on the new algorithm shows that the optimal solution can guarantee the focal spot’s variation range in 5–10 pixels under image coordinates’ system equivalent to the space with a 3 m distance and 0.6–1.2 mm positioning accuracy.
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spelling pubmed-93175172022-07-27 Least-Square-Method-Based Optimal Laser Spots Acquisition and Position in Cooperative Target Measurement Li, Kai Yuan, Feng Hu, Yinghui Du, Yongbin Chen, Wei Lan, Chunyun Sensors (Basel) Article The relative positioning precisions of coordinate points is an important indicator that affects the final accuracy in the visual measurement system of space cooperative targets. Many factors, such as measurement methods, environmental conditions, data processing principles and equipment parameters, are supposed to influence the cooperative target’s acquisition and determine the precision of the cooperative target’s position in a ground simulation experiment with laser projected spots on parallel screens. To overcome the precision insufficiencies of cooperative target measurement, the factors of the laser diode supply current and charge couple device (CCD) camera exposure time are studied in this article. On the hypothesis of the optimal experimental conditions, the state equations under the image coordinates’ system that describe the laser spot position’s variation are established. The novel optimizing method is proposed by taking laser spot position as state variables, diode supply current and exposure time as controllable variables, calculating the optimal controllable variables through intersecting the focal spot centroid line and the 3-D surface, and avoiding the inconvenience of solving nonlinear equations. The experiment based on the new algorithm shows that the optimal solution can guarantee the focal spot’s variation range in 5–10 pixels under image coordinates’ system equivalent to the space with a 3 m distance and 0.6–1.2 mm positioning accuracy. MDPI 2022-07-07 /pmc/articles/PMC9317517/ /pubmed/35890797 http://dx.doi.org/10.3390/s22145110 Text en © 2022 by the authors. https://creativecommons.org/licenses/by/4.0/Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/).
spellingShingle Article
Li, Kai
Yuan, Feng
Hu, Yinghui
Du, Yongbin
Chen, Wei
Lan, Chunyun
Least-Square-Method-Based Optimal Laser Spots Acquisition and Position in Cooperative Target Measurement
title Least-Square-Method-Based Optimal Laser Spots Acquisition and Position in Cooperative Target Measurement
title_full Least-Square-Method-Based Optimal Laser Spots Acquisition and Position in Cooperative Target Measurement
title_fullStr Least-Square-Method-Based Optimal Laser Spots Acquisition and Position in Cooperative Target Measurement
title_full_unstemmed Least-Square-Method-Based Optimal Laser Spots Acquisition and Position in Cooperative Target Measurement
title_short Least-Square-Method-Based Optimal Laser Spots Acquisition and Position in Cooperative Target Measurement
title_sort least-square-method-based optimal laser spots acquisition and position in cooperative target measurement
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9317517/
https://www.ncbi.nlm.nih.gov/pubmed/35890797
http://dx.doi.org/10.3390/s22145110
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