July 20, 1998This is a preprint of a paper intended for publication in a journal or proceedings. Since changes may be made before publication, this preprint is made available with the understanding that it will not be cited or reproduced without the permission of the author.
PREPRINTThis paper was prepared for submittal to the DISCLAIMER This document was prepared as an account of work sponsored by an agency of the United States Government. Neither the United States Government nor the University of California nor any of their employees, makes any warranty, express or implied, or assumes any legal liability or responsibility for the accuracy, completeness, or usefulness of any information, apparatus, product, or process disclosed, or represents that its use would not infringe privately owned rights. Reference herein to any specific commercial product, process, or service by trade name, trademark, manufacturer, or otherwise, does not necessarily constitute or imply its endorsement, recommendation, or favoring by the United States Government or the University of California. The views and opinions of authors expressed herein do not necessarily state or reflect those of the United States Government or the University of California, and shall not be used for advertising or product endorsement purposes. Abstract. 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 N 2 for ACS and a novel pressure-fed, non-toxic, monopropellant hydrogen peroxide propulsion system for maneuvering.
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