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On the possible use of satellite fixed positions for Argo profiles in case of GPS failures

Satish, RUVN and Udaya Bhaskar, TVS and Ravichandran, M and Suresh Kumar, N (2014) On the possible use of satellite fixed positions for Argo profiles in case of GPS failures. Technical Report. INCOIS, Hyderabad.

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Abstract

INCOIS had deployed iridium based PROVOR Bio-Argo floats obtained from NKE, France. These floats are fitted with GPS for obtaining accurate position of the Argo profiles. However there are cases where in the GPS fitted with the Argo floats tend to give wrong positions owing to unknown reasons. In this present work we discuss the possibilities of using the Iridium satellite fixed position in case of GPS failures. For this, analysis was done by comparing the GPS and satellite fixed profiles positions of good floats. These statistics can be used for using the satellite fixed position in case of GPS failures. For each comparison the satellite fixed position with least circular error probability (CEP) radius was chosen. The study suggested that on a average the satellite fixed positions tend to differ from the GPS fixed positions by 0.03 degrees. CEP radii are found to be consistent with the difference between satellite fixed position and GPS position. Based on this we suggest a quality flag of 2 for positions with CEP radius <=4 and flag 4 for any other positions.

Item Type: Monograph (Technical Report)
Additional Information: Argo, GPS, CEP Radius, Accuracy, Precision
Subjects: Oceanography > oceanography
Depositing User: INCOIS Library
Date Deposited: 25 Jan 2016 08:57
Last Modified: 25 Jan 2016 08:57
URI: http://moeseprints.incois.gov.in/id/eprint/3560

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