Fault-tolerant inertial navigation system

Details Fault-tolerant inertial navigation system Fault-tolerant inertial navigation system

1991-04-26

1993-02-02

Lall, Parshotam S.

Boots, shoes, and leggings

33321, G06F 1550

Patent

active

051843048

ABSTRACT:
Disclosed herein is a Fault-Tolerant Inertial Navigation System comprising, in a preferred embodiment, a Redundant Set of at least two Inertial Navigation Systems, from which one may identify and isolate at least one instrument within an Inertial Navigation Unit which shows substantial performance degradation. The two inertial navigation units are fully capable of performing navigational functions. Each of these inertial navigation units has a plurality of navigational instruments, including at least three linear sensors (such as accelerometers) and three angular change sensors (such as gyroscopes or ring laser gyroscopes). No two linear sensors nor any two angular change sensors of either unit are aligned colinearly. Each of the inertial navigation units produces a set of independent navigational solutions at each of their respective outputs. The independent navigational solutions of each of the navigation units are compared and any significantly degraded performance of any one linear sensor or any one angular change sensor is detected.

REFERENCES:
patent: 3489004 (1970-01-01), Barnhill
patent: 3680355 (1972-08-01), Goldstein
patent: 4173784 (1979-11-01), Heath et al.
patent: 4425040 (1984-01-01), Ljung
patent: 4914598 (1990-04-01), Krogmann et al.
patent: 5012424 (1991-04-01), Dodson
patent: 5050087 (1991-09-01), Walrath et al.
Chapter 11-Application Of Kalman Filtering Theory To Augmented Inertial Navigation Systems; Dr. J. R. Huddle; Article of Litton's Guidance & Control Systems Division (Feb. 1970) pp. 233-268.
A New Mathematical Formulation for Strapdown Inertial Navigation; John E. Bortz; The Analytic Sciences Corporation, Reading, Mass.; Aug. 24, 1970; pp. 61-66.

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