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dc.contributor.authorEriksen, Torkilden_GB
dc.contributor.authorHelleren, Øysteinen_GB
dc.contributor.authorSkauen, Andreas Nordmoen_GB
dc.contributor.authorStoresund, Frode Andréen_GB
dc.contributor.authorBjørnevik, Andersen_GB
dc.contributor.authorÅsheim, Haralden_GB
dc.contributor.authorBlindheim, Eirik Voieen_GB
dc.contributor.authorHarr, Jonen_GB
dc.date.accessioned2019-12-03T10:10:12Z
dc.date.accessioned2020-01-13T11:12:06Z
dc.date.available2019-12-03T10:10:12Z
dc.date.available2020-01-13T11:12:06Z
dc.date.issued2019-11-21
dc.identifier.citationEriksen T, Helleren Ø, Skauen AN, Storesund FA, Bjørnevik A, Åsheim H, Blindheim EV, Harr J. In-orbit AIS performance of the Norwegian microsatellites NorSat-1 and NorSat-2. CEAS Space Journal. 2019en_GB
dc.identifier.urihttp://hdl.handle.net/123456789/104188
dc.identifier.urihttp://hdl.handle.net/20.500.12242/2659
dc.descriptionEriksen, Torkild; Helleren, Øystein; Skauen, Andreas Nordmo; Storesund, Frode André; Bjørnevik, Anders; Åsheim, Harald; Blindheim, Eirik Voie; Harr, Jon. In-orbit AIS performance of the Norwegian microsatellites NorSat-1 and NorSat-2. CEAS Space Journal 2019en_GB
dc.description.abstractTwo Norwegian AIS-satellites, NorSat-1 and NorSat-2, were launched in July 2017. Both are equipped with the ASR x50, the latest space-AIS receiver developed by Kongsberg Seatex AS, ofering advanced signal processing and continuous operation on all four AIS channels. The NorSat-satellites collect~1.5 million messages from~50,000 ships per day (24 h) each, which is a factor~2.8 increase in the number of messages compared to the ASR 100 on-board AISSat-1 and AISSat-2. The improvements of the AIS-satellites can be attributed to three developments: the performance of the receiver, the use of antenna diversity, and the use of frequency channel diversity. Daily statistics for February 2018 over the Mediterranean Sea illustrate the improvements: The median value of the number of messages received with NorSat-1 using only one antenna is 2.3 times higher than for AISSat-1. When both NorSat-1 antennas are used, the improvement factor becomes 4.1, and fnally, when two additional receiver channels are used to collect long-range AIS messages, the total improvement becomes 8.2 times. In terms of ships detected, the factors are 1.8, 2.7, and 4.4 for the respective steps. Long-range AIS messages amount to just 5% of the total AIS messages received by NorSat-1 in August 2017, but it allows to detect 20% more ships on a global scale, and as much as 10 times more ships in a the high-trafc area in the North Sea.en_GB
dc.language.isoenen_GB
dc.subjectTermSet Emneord::Maritim overvåkningen_GB
dc.subjectTermSet Emneord::AIS (Automatic Identification System)en_GB
dc.subjectTermSet Emneord::Satellitteren_GB
dc.titleIn-orbit AIS performance of the Norwegian microsatellites NorSat-1 and NorSat-2en_GB
dc.typeArticleen_GB
dc.date.updated2019-12-03T10:10:12Z
dc.identifier.cristinID1753297
dc.identifier.doihttps://doi.org/10.1007/s12567-019-00289-1
dc.source.issn1868-2502
dc.source.issn1868-2510
dc.type.documentJournal article
dc.relation.journalCEAS Space Journal


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