First Calibration Results for the SARAL/AltiKa Altimetric Mission Using the Gavdos Permanent Facilities
Based on these observations and the gravimetric geoid model, the altimeter bias for the SARAL/AltiKa is determined as mean value of −46mm ±10mm, and a median of −42 mm ±10 mm, using GDR-T data at 40 Hz rate. A preliminary cross-over analysis of the sea surface heights at a location south of Gavdos showed that SARAL/AltiKa measure less than Jason-2 by 4.6 cm. These bias values are consistent with those provided by Corsica, Harvest, and Karavatti Cal/Val sites. The wet troposphere and the ionosphere delay values of satellite altimetric measurements are also compared against in-situ observations (−5 mm difference in wet troposphere and almost the same for the ionosphere) determined by a local array of permanent GNSS receivers, and meteorological sensors.
Document Type: Research Article
Affiliations: 1: Technical University of Crete, Geodesy and Geomatics Engineering Lab, Mineral Resources Engineering Department, Chania, Greece 2: Space Geomatica Ltd., Chania, Greece 3: Aristotle University of Thessaloniki, Surveying Engineering, Thessaloniki, Greece
Publication date: September 10, 2015