Precision Stabilization of a Ball Joint Gimbaled (BJG) Mirror

Award Information
Agency: Department of Defense
Branch: Navy
Contract: N68335-09-C-0044
Agency Tracking Number: N074-007-0402
Amount: $499,707.00
Phase: Phase II
Program: STTR
Awards Year: 2009
Solitcitation Year: 2007
Solitcitation Topic Code: N07-T007
Solitcitation Number: N/A
Small Business Information
D & S CONSULTANTS, INC.
P.O. Box 7259, Freehold, NJ, 07728
Duns: 792244097
Hubzone Owned: N
Woman Owned: N
Socially and Economically Disadvantaged: N
Principal Investigator
 Will McDowel
 Senior Systems Engineer
 (407) 207-1900
 wmcdowell@dsci.com
Business Contact
 John McNamara
Title: Senior Vice President
Phone: (732) 542-3113
Email: jmcnamara@dsci.com
Research Institution
 UNIV. OF CENTRAL FLORIDA
 Wasfy Mikhael
 4000 Central Florida Boulevard
Orlando, FL, 32816
 (407) 823-3210
 Nonprofit college or university
Abstract
In Phase I, DSCI developed an approach for achieving precision stabilization of a ball joint gimbaled (BJG) mirror by providing the control system with a direct, high precision measurement of the angular position of the BJG mirror. This is accomplished by means of a novel, wide-field-of-regard (WFOR) optical tilt sensor. Combining the precise, but lower bandwidth, tilt sensor feedback with the high speed, but inaccurate, shaft encoder feedback results in precise, high bandwidth control of the BJG mirror. Simulink simulations indicate that line-of-sight stabilization of tens of microradians is achievable with this hybrid feedback approach. In Phase II, a prototype WFOR tilt sensor that is designed to be integrated into NAVAIR’s Build 4 BJG mirror system will be fabricated and tested. The sensor will then be integrated into the Build 4 BJG mirror system and the control algorithm modified to implement the hybrid feedback algorithm. This “precision stabilized” version of the Build 4 mirror will then be tested under simulated operational conditions in the laboratory at DSCI and China Lake to verify the line of sight stabilization performance of the system. Finally, the “precision stabilized” version of the Build 4 mirror will be tested under field conditions at China Lake.

* information listed above is at the time of submission.

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