Research on High-Precision Initial Pointing for Near-Earth Laser Communication
This paper proposes a systematic ground experimental method to address the insufficient initial pointing accuracy of optical terminals in free space optical communication (FSO). By utilizing a multi-coordinate system transformation model combined with geodetic coordinates obtained from a Global Navi...
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| Format: | Article |
| Language: | English |
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MDPI AG
2025-07-01
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| Series: | Photonics |
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| Online Access: | https://www.mdpi.com/2304-6732/12/7/706 |
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| _version_ | 1850071301424676864 |
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| author | Yuang Li Xuan Wang Junfeng Han Xinxin Quan |
| author_facet | Yuang Li Xuan Wang Junfeng Han Xinxin Quan |
| author_sort | Yuang Li |
| collection | DOAJ |
| description | This paper proposes a systematic ground experimental method to address the insufficient initial pointing accuracy of optical terminals in free space optical communication (FSO). By utilizing a multi-coordinate system transformation model combined with geodetic coordinates obtained from a Global Navigation Satellite System (GNSS), the elevation and azimuth angles of the optical terminal are calculated to achieve initial pointing. High-precision horizontal installation and true north direction calibration are accomplished using a GNSS dual-antenna system and a digital inclinometer to suppress mechanical installation errors. Furthermore, an iterative stellar calibration method is proposed, leveraging ephemeris to precompute stellar positions and optimize correction values through multiple observations, significantly improving pointing accuracy. In a 104.68 km span experiment conducted in the Qinghai Lake area, the azimuth and elevation angle errors of the optical terminal were reduced to −0.0293° and −0.0068°, respectively, with the uncertainty region narrowed to 0.0586°. These results validate the effectiveness of the proposed method in high-precision rapid link establishment, providing technical support for the engineering application of satellite-to-ground laser communication. |
| format | Article |
| id | doaj-art-15a4887bd8df4a589d04f4d400789dc6 |
| institution | DOAJ |
| issn | 2304-6732 |
| language | English |
| publishDate | 2025-07-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Photonics |
| spelling | doaj-art-15a4887bd8df4a589d04f4d400789dc62025-08-20T02:47:21ZengMDPI AGPhotonics2304-67322025-07-0112770610.3390/photonics12070706Research on High-Precision Initial Pointing for Near-Earth Laser CommunicationYuang Li0Xuan Wang1Junfeng Han2Xinxin Quan3Xi’an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi’an 710119, ChinaXi’an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi’an 710119, ChinaXi’an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi’an 710119, ChinaXi’an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi’an 710119, ChinaThis paper proposes a systematic ground experimental method to address the insufficient initial pointing accuracy of optical terminals in free space optical communication (FSO). By utilizing a multi-coordinate system transformation model combined with geodetic coordinates obtained from a Global Navigation Satellite System (GNSS), the elevation and azimuth angles of the optical terminal are calculated to achieve initial pointing. High-precision horizontal installation and true north direction calibration are accomplished using a GNSS dual-antenna system and a digital inclinometer to suppress mechanical installation errors. Furthermore, an iterative stellar calibration method is proposed, leveraging ephemeris to precompute stellar positions and optimize correction values through multiple observations, significantly improving pointing accuracy. In a 104.68 km span experiment conducted in the Qinghai Lake area, the azimuth and elevation angle errors of the optical terminal were reduced to −0.0293° and −0.0068°, respectively, with the uncertainty region narrowed to 0.0586°. These results validate the effectiveness of the proposed method in high-precision rapid link establishment, providing technical support for the engineering application of satellite-to-ground laser communication.https://www.mdpi.com/2304-6732/12/7/706laser communicationinitial pointingcoordinate transformationstellar calibration |
| spellingShingle | Yuang Li Xuan Wang Junfeng Han Xinxin Quan Research on High-Precision Initial Pointing for Near-Earth Laser Communication Photonics laser communication initial pointing coordinate transformation stellar calibration |
| title | Research on High-Precision Initial Pointing for Near-Earth Laser Communication |
| title_full | Research on High-Precision Initial Pointing for Near-Earth Laser Communication |
| title_fullStr | Research on High-Precision Initial Pointing for Near-Earth Laser Communication |
| title_full_unstemmed | Research on High-Precision Initial Pointing for Near-Earth Laser Communication |
| title_short | Research on High-Precision Initial Pointing for Near-Earth Laser Communication |
| title_sort | research on high precision initial pointing for near earth laser communication |
| topic | laser communication initial pointing coordinate transformation stellar calibration |
| url | https://www.mdpi.com/2304-6732/12/7/706 |
| work_keys_str_mv | AT yuangli researchonhighprecisioninitialpointingfornearearthlasercommunication AT xuanwang researchonhighprecisioninitialpointingfornearearthlasercommunication AT junfenghan researchonhighprecisioninitialpointingfornearearthlasercommunication AT xinxinquan researchonhighprecisioninitialpointingfornearearthlasercommunication |