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From Telemetry to Level 1b: Architecture and Processing Strategy

Diana De Candia(1), Teresa Geminale(1), Pierluca Mantovani(1) and Carlo Zelli(1)

(1) Advanced Computer Systems ACS SpA., Via della Bufalotta 378, 00139 Rome, Italy

Abstract

This presentation provides an overview of the Processing Facility Infrastructure and of its processors designed by ACS for the GOCE Mission of ESA.

GOCE is the Gravimetry mission of ESA scheduled for launch in 2007 as part of the Earth Explorers Programme. GOCE Level 1b processing, which actually encompasses science processing to transform telemetry in to engineering calibrated values, calibration processing for gradiometer and GPS instruments, monitoring processing for attitude control and gradiometer, is performed in the PDS within a hosting environment named IPF (Instrument Processing Facility). The generation of the full set of Level 1b products is actually not a simple matter, since several types of products shall be created and there exist strong interrelations among the various products giving rise to a fairly complex data flow. Additionally, there are different types of latency requirements for the products: the Nominal Level 1b products will be generated on orbit basis, while Calibration products may require exploitations of long sequences of data (even more than a single orbit). As a consequence of these requirements, the IPF architecture has been designed to be flexible (in order to cope with various types of processors and product types to be generated) as well as open to the hosting of several types of processors, not excluding the possibility of co-existence in the infrastructure of different versions of the same basic processor due to the highly experimental nature of the mission. At the same time, the IPF shall be available for the plugging of totally new processors which may generate new products in addition to the existing ones. The design of the IPF which will be reviewed in this paper has been deeply based on the well proven architecture designed and developed by ACS for CRYOSAT and currently in use also for the ADM-Aeolus PDS infrastructures. Some innovations have been introduced to cope with the specific requirements of GOCE. This architecture will be presented in this paper together with the products, Data Flow and the resulting processing strategy.

 

Workshop presentation

Keywords: ESA European Space Agency - Agence spatiale europeenne, observation de la terre, earth observation, satellite remote sensing, teledetection, geophysique, altimetrie, radar, chimique atmospherique, geophysics, altimetry, radar, atmospheric chemistry