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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,...
Autores principales: | , , , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
MDPI
2022
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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. |
format | Online Article Text |
id | pubmed-9317517 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2022 |
publisher | MDPI |
record_format | MEDLINE/PubMed |
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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