CRYOSAT ORBIT ACCURACY ASSESSMENT BASED ON MULTI SATELLITE CROSS OVER REDUCTION TECHNIC OVER OCEAN AND IMPACT OF LONG-TERM CHANGES IN THE GRAVITY FIELD ON ENVISAT AND CRYOSAT ORBIT SOLUTIONS A PRELIMINARY ANALYSIS

摘要

CryoSat LRM data has been processed with the processing prototype developed by CNES. CryoSat Processing Prototype (C2P) has been developed internally to prepare the SAR processing study over ocean. In that frame, the LRM processing was also included and validated thanks to Jason-2 data. We have analyzed the CryoSat LRM data over ocean and feed those data inside the CNES CalVal multi mission tool to assess the orbit quality compared to Jason-2 operational orbit. This CalVal analysis is based on the computation of multi satellite cross overs over ocean and compute the orbit error estimates by spline functions. As Jason-2 orbit quality has a quality of 1-2 centimeters (depending on the orbit latency) this allows to analyze the CryoSat obit quality. MOE orbit qualities are presented here.