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Proceedings Paper

Internal Bearing Stabilized Sighting Unit (IBSSU) A New Concept In Stabilization
Author(s): Edward Louis Forys
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Paper Abstract

The McDonnell Douglas Astronautics Company (MDAC) Internal Bearing Stabilized Sighting Unit (IBSSU) utilizes a new patented physical arrangement of servo components to attain better stabilization, higher reliability, and lighter weight than possible with other techniques. A key feature of this concept is high servo bandwidth resulting in a very large attenuation of angular inputs. This is accomplished by using a special direct drive wide gap torquer which acts directly between the payload and mechanical ground, and has none of the limitations of conventional torque motors such as cogging, eddy current drag, friction, etc. Another important element in the design is use of soft vibration isolators which effectively decouple the payload from typical helicopter inputs, without affecting servo operation. A flyable unit has been constructed and has demonstrated high stability in both lab test, and flight test on an AH-1 Cobra helicopter. Stabilities attained were typically on the order of a few microradians, rms, without gunfire. With severe gunfire, line of site jitter increased to 25 µr rms.

Paper Details

Date Published: 23 December 1980
PDF: 4 pages
Proc. SPIE 0242, Long Focal Length, High Altitude Standoff Reconnaissance, (23 December 1980); doi: 10.1117/12.959277
Show Author Affiliations
Edward Louis Forys, McDonnell Douglas Astronautics Company (United States)

Published in SPIE Proceedings Vol. 0242:
Long Focal Length, High Altitude Standoff Reconnaissance
Donald H. Jarvis, Editor(s)

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