Project Title:

Gradiometry Attitude Measurement System (GAMS)

ITHACO, Inc.
735 W. Clinton St.
P.O. Box 6437
Ithaca, NY 14851-6437

93-1-09     01   7640

Gradiometry Attitude Measurement System (GAMS)

Abstract:

A program leading to the definition of a spaceborne attitude
determination system based upon gravity field measurements is
proposed. The specific innovation involves processing gravity
gradient measurements from a network of accelerometers. Precision
determination of attitude (0.003 degrees) can be expected at an
update rate of 10 Hz. This project addresses the need for a
high-accuracy, low-cost, low-power, and low-mass attitude
determination system for use on-board spacecraft, in particular
small momentum biased, nadir pointing satellites. The proposed
systems engineering consists of six tasks: 1) measurement error
analysis, 2) attitude determination accuracy definition, 3)
gradiometer survey and system electronic design definition, 4)
requirements for the satellite hardware suite, 5) attitude
determination flight software specifications, 6) planning for a
proof-of-concept demonstration to be executed under Phase II. 
The expected benefits to NASA are numerous with the current trend
toward development of small, low-cost satellites.

The GAMS sensor will be marketed to prime contractors and other
private concerns that have a need for low-cost, precision
attitude determination.

GAMS, Gradiometer, Gradiometry, Attitude, Satellite, Systems,
Spacecraft