{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2025,11,4]],"date-time":"2025-11-04T23:44:55Z","timestamp":1762299895755,"version":"build-2065373602"},"reference-count":23,"publisher":"MDPI AG","issue":"18","license":[{"start":{"date-parts":[[2021,9,18]],"date-time":"2021-09-18T00:00:00Z","timestamp":1631923200000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Remote Sensing"],"abstract":"<jats:p>Two-way Laser Time Transfer (TLTT) using the Ajisai satellite has been considered as a more accurate and stable time transfer technique than existing methods; TLTT requires the kHz laser pulses to decrease the systematic restrictions for TLTT realization. However, because of the low energy of the kHz laser pulses as well as the low cross section due to the small size of the Ajisai reflecting mirror, the link budget is an important issue to establish the TLTT link between two ground stations. In this study, the TLTT link budget is investigated to find the optimal laser pulse energy via analysis of geometric effects using 30 days of orbital data of the Ajisai satellite from 29 March 2021 within a ground network consisting of four stations located in three countries. The geometric configuration reduces the TLTT link budget by three orders of magnitude due to free space loss, atmospheric transmission, and effective cross section; then, the pulse energy is required to be much higher than laser ranging to the Ajisai satellite. It is shown from the simulation that a few tens of mJ level of pulse energy at the transmitting station is quite enough for TLTT realization.<\/jats:p>","DOI":"10.3390\/rs13183739","type":"journal-article","created":{"date-parts":[[2021,9,21]],"date-time":"2021-09-21T22:35:20Z","timestamp":1632263720000},"page":"3739","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":3,"title":["Link Budget Analysis with Laser Energy for Time Transfer Using the Ajisai Satellite"],"prefix":"10.3390","volume":"13","author":[{"ORCID":"https:\/\/orcid.org\/0000-0001-8060-6050","authenticated-orcid":false,"given":"Jong Uk","family":"Park","sequence":"first","affiliation":[{"name":"Korea Astronomy and Space Science Institute, Daejeon 34055, Korea"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-5266-1335","authenticated-orcid":false,"given":"Hyung-Chul","family":"Lim","sequence":"additional","affiliation":[{"name":"Korea Astronomy and Space Science Institute, Daejeon 34055, Korea"}]},{"given":"Ki-Pyoung","family":"Sung","sequence":"additional","affiliation":[{"name":"Korea Astronomy and Space Science Institute, Daejeon 34055, Korea"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-2019-3615","authenticated-orcid":false,"given":"Mansoo","family":"Choi","sequence":"additional","affiliation":[{"name":"Korea Astronomy and Space Science Institute, Daejeon 34055, Korea"}]}],"member":"1968","published-online":{"date-parts":[[2021,9,18]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"983","DOI":"10.1109\/5.84975","article-title":"Two-Way Time Transfer via Communication Satellites","volume":"79","author":"Kirchner","year":"1991","journal-title":"Proc. IEEE"},{"key":"ref_2","doi-asserted-by":"crossref","first-page":"27","DOI":"10.1088\/0026-1394\/32\/1\/003","article-title":"Operation and data analysis in the LASSO experiment","volume":"32","author":"Freelance","year":"1995","journal-title":"Metrologia"},{"key":"ref_3","doi-asserted-by":"crossref","first-page":"191","DOI":"10.1023\/A:1007982512087","article-title":"T2L2\u2014Time Transfer by Laser Link: A New Optical Time Transfer Generation","volume":"7","author":"Fridelance","year":"1997","journal-title":"Exp. Astron."},{"key":"ref_4","unstructured":"Vrancken, P. (2008). Characterization of T2L2 (Time Transfer by Laser Link) on the Jason 2 Ocean Altimetry Satellite and Micrometric Laser Ranging. [Ph.D. Thesis, Universit\u00e9 de Nice]."},{"key":"ref_5","doi-asserted-by":"crossref","first-page":"1043","DOI":"10.1142\/S0218271808012681","article-title":"Time transfer by laser link\u2014The T2L2 experiment on Jason-2 and further experiments","volume":"17","author":"Samain","year":"2008","journal-title":"Int. J. Mod. Phys. D"},{"key":"ref_6","doi-asserted-by":"crossref","first-page":"503","DOI":"10.1088\/0026-1394\/51\/5\/503","article-title":"Time transfer by laser link (T2L2): Characterization and calibration of the flight instrument","volume":"51","author":"Samain","year":"2014","journal-title":"Metrologia"},{"key":"ref_7","doi-asserted-by":"crossref","first-page":"526","DOI":"10.1109\/TGRS.1987.289830","article-title":"Launch and Observation Program of the Experimental Geodetic Satellite of Japan","volume":"GE-25","author":"Sasaki","year":"1987","journal-title":"IEEE Trans. Geosci. Remote Sens."},{"key":"ref_8","unstructured":"Kunimori, H., Takahashi, F., Itabe, T., and Yamamoto, A. (1992;, January 18\u201322). Laser ranging application to time transfer using geodetic satellite and to other Japanese space programs. Proceedings of the 8th international Workshop on Laser Ranging Instrumentation, Annapolis, MD, USA."},{"key":"ref_9","doi-asserted-by":"crossref","first-page":"957","DOI":"10.1016\/j.asr.2019.05.030","article-title":"Hypertemporal photometric measurement of spaceborne mirrors specular reflectivity for Laser Time Transfer link model","volume":"64","author":"Kucharski","year":"2019","journal-title":"Adv. Space Res."},{"key":"ref_10","unstructured":"Otsubo, T., Kunimori, H., and Gotoh, T. (2006, January 15\u201320). New Application for Khz Laser Ranging: Time Transfer Via Ajisai. Proceedings of the 15th international Workshop on Laser Ranging, Canberra, Australia."},{"key":"ref_11","doi-asserted-by":"crossref","first-page":"133","DOI":"10.1029\/GD025p0133","article-title":"Millimeter Accuracy Satellite Laser Ranging: A Review","volume":"Volume 25","author":"Smith","year":"1993","journal-title":"Contributions of Space Geodesy to Geodynamics: Technology"},{"key":"ref_12","doi-asserted-by":"crossref","first-page":"245","DOI":"10.5140\/JASS.2010.27.3.245","article-title":"Tracking Capability Analysis of ARGO-M Satellite Laser Ranging System for STSAT-2 and KOMPSAT-5","volume":"27","author":"Lim","year":"2010","journal-title":"J. Astron. Space Sci."},{"key":"ref_13","doi-asserted-by":"crossref","first-page":"983","DOI":"10.1016\/j.asr.2015.12.010","article-title":"Confirmation of gravitationally induced attitude drift of spinning satellite Ajisai with Graz high repetition rate SLR data","volume":"57","author":"Kucharski","year":"2016","journal-title":"Adv. Space Res."},{"key":"ref_14","doi-asserted-by":"crossref","first-page":"1629","DOI":"10.1109\/TGRS.2009.2031229","article-title":"The impact of solar irradiation on Ajisai\u2019s spin period measured by the Graz 2 kHz SLR system","volume":"48","author":"Kucharski","year":"2010","journal-title":"IEEE Trans. Geosci. Remote Sens."},{"key":"ref_15","doi-asserted-by":"crossref","first-page":"63","DOI":"10.1016\/j.asr.2018.08.010","article-title":"Time-varying solar radiation pressure on Ajisai in comparison with LAGEOS satellite","volume":"63","author":"Hattori","year":"2019","journal-title":"Adv. Space Res."},{"key":"ref_16","doi-asserted-by":"crossref","first-page":"1417","DOI":"10.1109\/36.843036","article-title":"Spin motion of the Ajisai satellite derived from spectral analysis of laser ranging data","volume":"38","author":"Otsubo","year":"2000","journal-title":"IEEE Trans. Geosci. Remote Sens."},{"key":"ref_17","doi-asserted-by":"crossref","first-page":"201","DOI":"10.1109\/TGRS.2006.882254","article-title":"Ajisai spin parameter determination using Graz kilohertz satellite laser ranging data","volume":"45","author":"Kirchner","year":"2007","journal-title":"IEEE Trans. Geosci. Remote Sens."},{"key":"ref_18","unstructured":"(2021, April 02). International Laser Ranging Service, Available online: https:\/\/ilrs.gsfc.nasa.gov\/network\/stations\/index.html."},{"key":"ref_19","doi-asserted-by":"crossref","unstructured":"Vallado, D., and Crawford, P. (2008;, January 18-21). SGP4 Orbit Determination. Proceedings of the AIAA\/AAS Astrodynamics Specialist Conference, Honolulu, HI, USA.","DOI":"10.2514\/6.2008-6770"},{"key":"ref_20","unstructured":"(2021, March 29). CelesTrak: Current NORAD Two-Line Element Sets. Available online: https:\/\/www.celestrak.com\/NORAD\/elements."},{"key":"ref_21","unstructured":"(2021, March 29). International Earth Rotation and Reference System Service. Available online: https:\/\/www.iers.org\/IERS\/EN\/Science\/EarthRotation\/EOP.html."},{"key":"ref_22","doi-asserted-by":"crossref","first-page":"212","DOI":"10.1088\/1674-4527\/12\/2\/009","article-title":"The use of laser ranging to measure space debris","volume":"12","author":"Zhang","year":"2012","journal-title":"Res. Astron. Astrophys."},{"key":"ref_23","doi-asserted-by":"crossref","first-page":"21","DOI":"10.1016\/j.asr.2012.08.009","article-title":"Laser measurements to space debris from Graz SLR station","volume":"51","author":"Kirchner","year":"2013","journal-title":"Adv. Space Res."}],"container-title":["Remote Sensing"],"original-title":[],"language":"en","link":[{"URL":"https:\/\/www.mdpi.com\/2072-4292\/13\/18\/3739\/pdf","content-type":"unspecified","content-version":"vor","intended-application":"similarity-checking"}],"deposited":{"date-parts":[[2025,10,11]],"date-time":"2025-10-11T07:01:44Z","timestamp":1760166104000},"score":1,"resource":{"primary":{"URL":"https:\/\/www.mdpi.com\/2072-4292\/13\/18\/3739"}},"subtitle":[],"short-title":[],"issued":{"date-parts":[[2021,9,18]]},"references-count":23,"journal-issue":{"issue":"18","published-online":{"date-parts":[[2021,9]]}},"alternative-id":["rs13183739"],"URL":"https:\/\/doi.org\/10.3390\/rs13183739","relation":{},"ISSN":["2072-4292"],"issn-type":[{"type":"electronic","value":"2072-4292"}],"subject":[],"published":{"date-parts":[[2021,9,18]]}}}