Redundant inertial measurement system
First Claim
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1. A redundant inertial measurement system for use in space navigation comprising:
- three gyros, each having at least two degrees of freedom and including first and second mutually orthogonal axes;
means for mounting said gyros in three distinct attitudes with the respective first axes orthogonally directed with respect to each other so as to develop a first orthogonal triad including the first axis of each gyro and the respective second axes directed at 45°
with respect to corresponding pairs of said first axes so as to develop a second triad skewed at 45°
to the first triad, the second triad including the second axis of each gyro;
means for deriving rate information relative to the first and second triads; and
means for processing said information.
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Abstract
A system providing economical redundant strap-down inertial measurement capability in a space navigation system. By appropriate orientation of two-degree-of-freedom dry tuned rotor gyros, the system is able to achieve complete redundancy utilizing only three gyro units. With this orientation, both orthogonal and skewed rate data are available. Not only are the necessary computations materially simplified, but this system also provides the necessary conditions for failure detection and isolation.
30 Citations
12 Claims
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1. A redundant inertial measurement system for use in space navigation comprising:
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three gyros, each having at least two degrees of freedom and including first and second mutually orthogonal axes; means for mounting said gyros in three distinct attitudes with the respective first axes orthogonally directed with respect to each other so as to develop a first orthogonal triad including the first axis of each gyro and the respective second axes directed at 45°
with respect to corresponding pairs of said first axes so as to develop a second triad skewed at 45°
to the first triad, the second triad including the second axis of each gyro;means for deriving rate information relative to the first and second triads; and means for processing said information. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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Specification