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The Wide Field Imager (WFI) is one of two scientific instruments onboard the next generation European x-ray observatory ATHENA. It will orbit Lagrange point L2 and send the acquired science data to a single ground station with a downlink that is available for several hours once per day. The data rate of the downlink is a bottleneck, which limits the amount of science data that can be transferred. Measurement data of the eRosita satellite which is in operation since mid of 2019 shows that a high radiation background generates parasitic sensor data that adds to the science data. In order to remove the parasitic data from the science data stream onboard, a Risc-V softcore processor implementation in the RTG4 FGPA has been studied. Depending on the observation scenario, the data rate is reduced by a factor of more than 50. Within this article, we describe the WFI onboard processing architecture, the sensor effects on space radiation and the hard- and software architecture of the Risc-V softcore that can be implemented to reduce the data rate on board. Three test cases are defined and executed to verify the performance of the data reduction scheme.

Satellite Onboard Data Reduction Using a Risc-V Core Inside an RTG4-Based Data Processing Pipeline