NASA SBIR 2009 Solicitation


PROPOSAL NUMBER: 09-2 S4.05-8441
SUBTOPIC TITLE: High Torque, Low Jitter Reaction Wheels or Control Moment Gyros
PROPOSAL TITLE: Reaction Wheel with Embedded MEMS IMU

SMALL BUSINESS CONCERN (Firm Name, Mail Address, City/State/Zip, Phone)
Milli Sensor Systems and Actuators, Inc.
93 Border Street
West Newton, MA 02465 - 2013
(617) 965-4872

PRINCIPAL INVESTIGATOR/PROJECT MANAGER (Name, E-mail, Mail Address, City/State/Zip, Phone)
Donato (Dan) Cardarelli
93 Border Street
West Newton, MA 02465 - 2013
(617) 965-4872

Estimated Technology Readiness Level (TRL) at beginning and end of contract:
Begin: 3
End: 5

TECHNICAL ABSTRACT (Limit 2000 characters, approximately 200 words)
Reaction wheels are used to stabilize satellites and to slew their orientation from object to object with precision and accuracy by varying the rotational speed of the wheels. Three or four wheels are usually used with three of them aligned along orthogonal axes. The degree to which pointing stability is achieved depends on the stability of the wheels' angular momentum vectors while spinning, which can be affected by static and dynamic unbalance contributions and other wheel construction issues. With the smaller satellites, requiring smaller wheels, the stability of the wheels will be even more challenging as the uncertainty of construction is likely to remain the same. To stabilize the smaller reaction wheels we propose to integrate a Sensor Chip containing MEMS gyroscopes and accelerometers with each reaction wheel. This allows direct measurement of the wheel motions for fine-tuning its operation. The improved wheel then becomes a means for improving IMU sensor stability for precision pointing and slewing from object to object.

POTENTIAL NASA COMMERCIAL APPLICATIONS (Limit 1500 characters, approximately 150 words)
MSSA's MEMS IMU Sensor Chip enables modular and programmable guidance & navigation systems with significantly reduced mass and cost for low-cost small spacecraft, microsatellites and nanosatellites. A MEMS IMU integrated with a reaction wheel enables both the measure of spin rate as well as the determination of attitude when three wheels are used. The applications are generally pointing and tracking.

POTENTIAL NON-NASA COMMERCIAL APPLICATIONS (Limit 1500 characters, approximately 150 words)
MSSA's single-chip Integrated MEMS IMU will be substantially smaller and less expensive, and will enable more highly-integrated applications than are possible with other MEMS IMUs. The principal military applications of MEMS IMUs are for interceptors and for precision-guided munitions, especially spinning munitions. Other military and commercial applications for MEMS IMUs are for the stabilization and GN&C of vehicles; for the stabilization and GN&C of small UAVs and for stabilization of UAV-borne sensors, seekers and cameras, (including Homeland Security and police operations); lower-cost IMUs for air, land and water vehicle navigation, with or without GPS-aiding; Personal Navigation for warfighters and civilian "first responders" such as fire-fighters; robotic stabilization and GN&C; precision motion tracking for portable/wearable systems (helmets & headsets); precision pointing and tracking for satellites, antennas and telescopes; and bore-hole measurement systems.

TECHNOLOGY TAXONOMY MAPPING (NASA's technology taxonomy has been developed by the SBIR-STTR program to disseminate awareness of proposed and awarded R/R&D in the agency. It is a listing of over 100 technologies, sorted into broad categories, of interest to NASA.)
Attitude Determination and Control
Autonomous Control and Monitoring
Guidance, Navigation, and Control
Integrated Robotic Concepts and Systems
Sensor Webs/Distributed Sensors
Telemetry, Tracking and Control

Form Generated on 08-06-10 17:29