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This paper summarizes the work at Lawrence Livermore National Laboratory in the development, integration and testing of the critical enabling technologies needed for the realization of agile micro-satellites (or MicroSats). Our objective is to develop autonomous, agile MicroSats weighing between 20 to 40 kilograms, with at least 300 m/s of Dv, that are capable of performing precision maneuvers in space, including satellite rendezvous, inspection, proximity operations, docking, and servicing missions. The MicroSat carries on-board a host of light-weight sensors and actuators, inertial navigation instruments, and advanced avionics. The avionics architecture is based on the CompactPCI bus and PowerPC processor family. This modular design leverages commercial-off-the-shelf technologies, allowing early integration and testing. The CompactPCI bus is a high-performance, processor independent I/O bus that minimizes the effects of future processor upgrades. PowerPCs are powerful RISC processors with significant inherent radiation tolerance. The MicroSat software development environment uses the space flight proven VxWorks, a commonly used, well tested, real-time operating system that provides a rapid development environment for integration of new software modules. The MicroSat is a 3-axis stabilized vehicle which uses cold gas N2 for ACS and a novel pressure-fed, non-toxic, monopropellant hydrogen peroxide propulsion system for maneuvering.

Autonomous, agile, micro-satellites and supporting technologies for use in low-earth orbit missions