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Technical Paper
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SPONSORING / MONITORING AGENCY NAME(S) AND ADDRESS(ES)Air Force Research Laboratory (AFMC) AFRL/PRS 5 Pollux Drive Edwards AFB CA 93524-7048
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DISTRIBUTION / AVAILABILITY STATEMENTApproved for public release; distribution unlimited. Company's MR-510 hydrazine arcjet system has been successfully flight qualified for use on Lockheed Martin Corporation's A2100™ communication satellite bus and is currently flying on six spacecraft. The MR-510 arcjet power conditioning unit (PCU) is a key clement of this system. It provides the required high voltage sian pulse and conditioned power to four 2 kW arcjet thrusters (operated two at a time) for north/south station keeping orbit maneuvers. The PCU draws up to 4.4 kW of power from the satellite's power bus and provides the command and telemetry interface utilizing a bidirectional serial data bus. The MR-510 arcjet PCU utilizes an N+l redundancy and cross strapping topology. This topology allows one PCU to perform the same functions that required four separate PCUs on previously developed arcjet systems, resulting in an overall reduced weight. A description of the PCU ■ design is provided along with a review uf die qualification test sequence and results.On-orbit performance on the first four A2100™ satellites has been nominal, with all indicators pointing to operation of the MR-510 arcjet system as designed and tested.
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