RISC-V：空间计算的新轨道.pdf

1、1ESA UNCLASSIFIED-For ESA Official Use Only1RISC-V Summit Europe 2025,ParisRISC-V:Reaching New Orbits in Space ComputingLucana Santos(lucana.santosesa.int);Roland Weigand(roland.weigandesa.int)22RISC-V is flying in spaceTRISAT-R,Nanosatellite by Skylabs/University of Maribor(SI),launched July 2022Po

2、larfire-SoC with RISC-V subsystem on the ISS in 2022(SpaceBilt)HARV RISC-V SoC on ROBUSTA-3A,launched 2024AI-eXpress,launched Jan 2025ETHZ Trikarenos,15th March 20253Space specific technical constraintsReliability Radiation Total ionising dose(TID)and single event effects(SEU)Commercial off-the-shel

3、f(COTS)needs expensive testing and system level mitigation Radiation hardening by design(RHBD),redundancy Vacuum Outgassing from package materials contamination of sensors Vibration At launch stress on interconnects Temperature Satellites can be very hot and very cold(-55 to 125 deg C)challenge for

4、timing closure.Thermal dilatation defects in interconnects.Functional Determinism Needed by timing critical control functions(launch,landers)Mixed criticality software Different levels of trust,time and space partitioning for fault containment.Specific interfaces Often inherited from commercial,auto

5、motive or military standards with additional constraints(determinism,electrical environment).MIL-1553B(galvanic isolation,inherited from aeronautics)SpaceWire(derived from IEEE1355 D/S encoding)SpaceFibre(extension of SpaceWire to high speed SerDes)Time Sensitive Networking(TSN)/TimeTriggered-Ethern

6、et(TTE)Lifetime of satellites up to 20 years longer than commercial electronics No repair!4Space specific technical constraintsReliability Radiation Total ionising dose(TID)and single event effects(SEU)Commercial off-the-shelf(COTS)needs expensive testing and system level mitigation Radiaition harde