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Meeting	ACGS Committee Meeting 107 - Boulder - March 2011
Agenda Location	5 SUBCOMMITTEE B – MISSILES AND SPACE 5.4 Low Noise MEMS Inertial Sensing in Space-Based Precision Pointing Applications
Title	Low Noise MEMS Inertial Sensing in Space-Based Precision Pointing Applications
Presenter	Shan Mohiuddin
Affiliation	Draper Labs
Available Downloads*	presentation
	Downloads are available to members who are logged in and either Active* or attended this meeting.
Abstract	Shan Mohiuddin, Peter Sherman, and John West Draper Laboratory Abstract Draper Laboratory’s DEXTRE Pointing Package (DPP) IMU program is a NASA/Goddard Space Flight Center supported effort to design a small, low-power precision pointing device for use on the International Space Station. The device, which includes a star camera and a Draper-designed MEMS inertial measurement unit, will support a number of tracking and proximity operations and will enable closed-loop control of the special purpose dexterous manipulator (SPDM) arm. The IMU and its supporting algorithms are designed specifically to provide the ability to gracefully navigate through star camera outages and to characterize the spacecraft’s vibration environment. The SWaP constraints and the on orbit thermal environment present unique challenges for in-mission calibration and initialization of a MEMS inertial sensor. The sensors used here are a new generation of low noise instruments, but still carry significant turn-on errors and in-mission bias drift. Strategies for overcoming these challenges will be discussed, including algorithm development, sensor modeling, mission-specific CONOPS, and unique electronics and packaging design tuned to minimize the effects of thermal sensitivity. Simulation results will support this discussion.