{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,1,18]],"date-time":"2026-01-18T04:14:20Z","timestamp":1768709660263,"version":"3.49.0"},"reference-count":29,"publisher":"MDPI AG","issue":"8","license":[{"start":{"date-parts":[[2010,8,25]],"date-time":"2010-08-25T00:00:00Z","timestamp":1282694400000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/3.0\/"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Remote Sensing"],"abstract":"<jats:p>This paper presents two space detected Global Positioning System (GPS)signals reflected off sea ice and compares the returned power profiles with independent estimates of ice concentration provided by the Advanced Microwave Scanning Radiometer (AMSR-E) and sea ice charts from the National Ice Center. The results of the analysis show significantly different signals received for each of the GPS reflections. For the first collection,comparisons with ice concentration estimates from AMSR-E and the National Ice Centers reveal a very strong GPS signal return off high concentration sea ice. The second GPS data collection occurs over a region of changing sea ice concentration, and the GPS signal level responds at roughly the same point that the AMSR-E data and National Ice Center charts indicate a change in ice concentration. However, the very strong signal of the first GPS collection is not consistent in magnitude with similar ice concentrations during the secondGPS data collection. This demonstration shows the potential and the difficulties of this new technique as a valuable low-cost compliment to existing sea ice monitoring instruments. Additionally, a general method for calculating the location of the specular reflection point on the Earth\u2019s surface and the received Doppler frequencies and code phase delays is presented as part of an on-board open-loop signal tracking technique.<\/jats:p>","DOI":"10.3390\/rs2082017","type":"journal-article","created":{"date-parts":[[2010,8,25]],"date-time":"2010-08-25T10:27:24Z","timestamp":1282732044000},"page":"2017-2039","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":64,"title":["Towards Sea Ice Remote Sensing with Space Detected GPS Signals: Demonstration of Technical Feasibility and Initial Consistency Check Using Low Resolution Sea Ice Information"],"prefix":"10.3390","volume":"2","author":[{"given":"Scott","family":"Gleason","sequence":"first","affiliation":[{"name":"Department of Electrical and Computer Engineering, Concordia University, 1455 de Maisonnueve West, EV 005.139, Montreal H3G IM8, QC, Canada"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"1968","published-online":{"date-parts":[[2010,8,25]]},"reference":[{"key":"ref_1","unstructured":"Cavalieri, D., Markus, T., and Comiso, J. (2005). AMSR-E Aqua Daily L3 12.5 km Brightness Temperature, Sea Ice Conentration and Snow Depth Polar Grids, National Snow and Ice Data Center. V002."},{"key":"ref_2","unstructured":"Earth Observing System Data and Information System (EOSDIS) (2009). Earth Observing System ClearingHOuse (ECHO) \/ Warehouse Inventory Search Tool (WIST), Available online: https:\/\/wist.echo.nasa.gov\/api\/."},{"key":"ref_3","unstructured":"Livingstone, C.E. (,  1989). Combined active\/passive microwave classification of sea ice. Proceedings of the IEEE Geoscience and Remote Sensing Symposium, Vancouver, BC, Canada."},{"key":"ref_4","doi-asserted-by":"crossref","unstructured":"Rees, W.J. (2005). Remote Sensing of Snow and Ice, CRC Press. [1st ed.].","DOI":"10.1201\/9780367801069"},{"key":"ref_5","doi-asserted-by":"crossref","first-page":"1675","DOI":"10.1109\/36.718638","article-title":"Inverse electromagnetic scattering models for sea ice","volume":"36","author":"Golden","year":"1998","journal-title":"IEEE Trans. Geosci. Remote Sens."},{"key":"ref_6","unstructured":"Onstott, R.G. (,  1989). Active microwave classification of sea ice. Proceedings of the IEEE Geoscience and Remote Sensing Symposium, Vancouver, BC, Canada."},{"key":"ref_7","doi-asserted-by":"crossref","first-page":"3171","DOI":"10.1080\/01431160802558790","article-title":"Retrieval of ice thickness distribution in the seasonal ice zone from L-band SAR","volume":"30","author":"Toyota","year":"2009","journal-title":"Int. J. Remote Sens."},{"key":"ref_8","doi-asserted-by":"crossref","first-page":"12562","DOI":"10.1029\/94JC00707","article-title":"A Microwave technique for mapping thin sea ice","volume":"99","author":"Cavalieri","year":"1994","journal-title":"J. Geophys. Res."},{"key":"ref_9","doi-asserted-by":"crossref","first-page":"1387","DOI":"10.1109\/36.843033","article-title":"An enhancement of NASA Team sea ice algorithm","volume":"38","author":"Markus","year":"2000","journal-title":"IEEE Trans. Geosci. Remote Sens."},{"key":"ref_10","unstructured":"Markus, T., and Cavalieri, D.J. (2008). AMSR-E algorithm theoretical basis document: Sea ice products, Available online: http:\/\/wwwghcc.msfc.nasa.gov\/AMSR\/documents.html."},{"key":"ref_11","doi-asserted-by":"crossref","unstructured":"Ngheim, S.V., and Clemente-Colon, P. (2009). Arctic sea ice mapping with satellite radars. IEEE AE Systems Magazine November.","DOI":"10.1109\/RADAR.2008.4720991"},{"key":"ref_12","doi-asserted-by":"crossref","first-page":"1705","DOI":"10.1109\/36.718639","article-title":"Field observations of the electromagnetic properties of first-year sea ice","volume":"36","author":"Perovich","year":"1998","journal-title":"IEEE Trans. Geosci. Remote Sens."},{"key":"ref_13","doi-asserted-by":"crossref","first-page":"1642","DOI":"10.1109\/36.718636","article-title":"Evolution of electromagnetic signatures of sea ice from initial formation to the establishment of thick first-year ice","volume":"36","author":"Grenfell","year":"1998","journal-title":"IEEE Trans. Geosci. Remote Sens."},{"key":"ref_14","unstructured":"(2008). Tutorial: Fundamentals of Remote Sensing, Microwave Remote Sensing, Radar Polimetry, Canada Centre for Remote Sensing, Natural Resources Canada. Available online: http:\/\/www.ccrs.nrcan.gc.ca\/resource\/tutor\/fundam\/chapter3\/08_e.php."},{"key":"ref_15","unstructured":"Ulaby, F., Moore, R.K., and Fung, A. (1982). Microwave Remote Sensing: Active and Passive, Vol.II: Radar Remote Sensing and Surface Scattering and Emission Theory, Artech House."},{"key":"ref_16","doi-asserted-by":"crossref","first-page":"2074","DOI":"10.1175\/1520-0426(2001)018<2074:AAASPO>2.0.CO;2","article-title":"Analyzing altimetry artifacts: Statistical properties of ocean waveforms","volume":"18","author":"Quartly","year":"2001","journal-title":"J. Atmos. Oceanic Technol."},{"key":"ref_17","doi-asserted-by":"crossref","first-page":"560","DOI":"10.1109\/TGRS.2002.1000316","article-title":"Delay Doppler analysis of bistatically reflected signals from the ocean surface: Theory and applications","volume":"40","author":"Elfouhaily","year":"2002","journal-title":"IEEE Trans. Geosci. Remote Sens."},{"key":"ref_18","unstructured":"Gleason, S., and Gebre-Egziabher, D. (2009). GNSS Applications and Methods, Artech House."},{"key":"ref_19","doi-asserted-by":"crossref","first-page":"111","DOI":"10.1016\/j.asr.2010.01.014","article-title":"GNSS reflectometry and remote sensing: New objectives and results","volume":"46","author":"Jin","year":"2010","journal-title":"J. Adv. Space Res."},{"key":"ref_20","unstructured":"Komjathy, A., Maslanik, J., Zavorotny, V.U., Axelrad, P., and Katzberg, S.J. (,  2000). Sea ice remote sensing using surface reflected GPS signals. Proceedings of the IEEE International Geoscience and Remote Sensing Symposium, Honolulu, HI, USA."},{"key":"ref_21","unstructured":"Belmonte Rivas, M. (2007). Bistatic Scattering of Global Positioning System Signals From Arctic Sea Ice. [Ph.D. Thesis, University of Colorado at Boulder]."},{"key":"ref_22","unstructured":"Misra, P., and Enge, P. (2001). Global Positioning System: Signals, Measurements, and Performance, Ganga Jamuna Press."},{"key":"ref_23","doi-asserted-by":"crossref","first-page":"208","DOI":"10.1016\/j.asr.2010.03.023","article-title":"Fading statistics and sensing accuracy of ocean scattered GNSS and altimetry signals","volume":"46","author":"Gleason","year":"2010","journal-title":"J. Adv. Space Res."},{"key":"ref_24","doi-asserted-by":"crossref","first-page":"1229","DOI":"10.1109\/TGRS.2005.845643","article-title":"Detection and processing of bistatically reflected GPS signals from low Earth orbit for the purpose of ocean remote sensing","volume":"43","author":"Gleason","year":"2005","journal-title":"IEEE Trans. Geosci. Remote Sens."},{"key":"ref_25","doi-asserted-by":"crossref","first-page":"951","DOI":"10.1109\/36.841977","article-title":"Scattering of GPS signals from the ocean with wind remote sensing application","volume":"38","author":"Zavorotny","year":"2000","journal-title":"IEEE Trans. Geosci. Remote Sens."},{"key":"ref_26","doi-asserted-by":"crossref","first-page":"191","DOI":"10.1007\/s00190-008-0300-3","article-title":"The International GNSS Service in a changing landscape of Global Navigation Satellite Systems","volume":"83","author":"Dow","year":"2009","journal-title":"J. Geodesy"},{"key":"ref_27","doi-asserted-by":"crossref","unstructured":"Gleason, S. (2006). Remote Sensing of Ocean, Ice and Land Surfaces Using Bistatically Scattered GNSS Signals From Low Earth Orbit. [Ph.D. Thesis, University of Surrey].","DOI":"10.1109\/IGARSS.2006.792"},{"key":"ref_28","unstructured":"Gleason, S., and Gebre-Egziabher, D. (2009). GNSS Applications and Methods, Artech House."},{"key":"ref_29","unstructured":"Piwowar, J.M., Brown, R., Polanski, M., LeDrew, E.F., Goodison, B.E., and Hirose, T. (,  2002). The Canadian Cryospheric Information Network: Facilitating access to sea ice, lake ice, snow cover, permafrost, and glacier data. Proceedings of the IEEE International Geoscience and Remote Sensing Symposium, Toronto, ON, Canada."}],"container-title":["Remote Sensing"],"original-title":[],"language":"en","link":[{"URL":"https:\/\/www.mdpi.com\/2072-4292\/2\/8\/2017\/pdf","content-type":"unspecified","content-version":"vor","intended-application":"similarity-checking"}],"deposited":{"date-parts":[[2025,10,11]],"date-time":"2025-10-11T22:03:13Z","timestamp":1760220193000},"score":1,"resource":{"primary":{"URL":"https:\/\/www.mdpi.com\/2072-4292\/2\/8\/2017"}},"subtitle":[],"short-title":[],"issued":{"date-parts":[[2010,8,25]]},"references-count":29,"journal-issue":{"issue":"8","published-online":{"date-parts":[[2010,8]]}},"alternative-id":["rs2082017"],"URL":"https:\/\/doi.org\/10.3390\/rs2082017","relation":{},"ISSN":["2072-4292"],"issn-type":[{"value":"2072-4292","type":"electronic"}],"subject":[],"published":{"date-parts":[[2010,8,25]]}}}