Day 4

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Paper title The synthesis of PRETTY and GRAS
Authors
  1. Heinrich Fragner RUAG Space GmbH Speaker
  2. Jacob Christensen RUAG Space AB
  3. Anders Carlström RUAG Space AB
  4. Andreas Dielacher RUAG Space GmbH
  5. Franz Zangerl
Form of presentation Poster
Topics
  • B7. NewSpace missions
    • B7.03 New Space missions with small and nanosatellites
Abstract text GNSS Radio Occultation (RO) observations from space have been successfully demonstrated since many years and their value for weather prediction is indisputable. The demand for higher spatial and temporal RO observations is steadily increasing as more and more applications in the downstream market rely on pin point accurate weather prediction. The exploitation of radio waves not only bended within the atmosphere but also reflected on the earth surface for analysis of surface features is a more recent development and from the perspective of the instrument architecture closely related to the RO method.
The GRAS instrument on MetOp first generation still provides observation data of unprecedented quality which is a result of high end GNSS receiver design including antenna, clock, LO and RF design. In contrast to this the PRETTY mission will provide GNSS passive reflectometer (PR) data with simple RF and antenna architecture which is suitable to be accommodated on a 3U CubeSat. With this approach good performance can be reached at a fraction of the cost. For the PRETTY development a COTS approach has been followed, and the costs for the signal processing and development of the high-level software have been significantly reduced.
We are presenting a concept in which the GRAS instrument is enhanced with the PRETTY signal processing part allowing to provide RO and PR observations to be performed with the same high-end performance. The high gain antennas and the front end based on the Saphyrion G3 architecture are used to provide baseband samples to the two different signal processing cores, one based on the AGGA-4 architecture the other one on a System on Chip using an ARM processor. The enhanced GRAS instrument can be used as hosted payload on small satellites and will provide both high quality RO and PR observations.