Optics: measuring and testing – Fiducial instruments – Deflection of line of sight
Patent
1989-04-03
1995-03-07
Buczinski, Stephen C.
Optics: measuring and testing
Fiducial instruments
Deflection of line of sight
33321, 33326, 35613901, 35613903, G02B 2732, G01B 1126, G01C 1900
Patent
active
053963261
ABSTRACT:
A strapped down astro-inertial navigator includes a roll outer gimbal, a pitch inner gimbal and a platform coupled to the inner gimbal. An instrument cluster which includes X-axis, Y-axis and Z-axis ring laser gyros (RLGs) and associated accelerometers is mounted to the platform. Also hard mounted to the platform is a stellar sensor which includes a telescope and a solid state focal plane array which views stellar reference objects. In an astro-inertial mode of operation one or more stellar objects are tracked for a period of time. The roll and the pitch gimbals are employed to point the telescope and, periodically, to observe and average out the effects of star sensor and horizontal accelerometer errors. The star sensor error observability is accomplished by periodically rotating the inner and outer gimbals through 180.degree. and the stellar objects once again tracked. Due to the 180.degree. rotation boresight errors within the stellar tracker are observed and compensated for. The 180.degree. rotation also serves to reorient the accelerometer input axes by 180.degree., thereby also beneficially causing accelerometer errors to average out. In a free inertial mode of operation the inner and outer gimbals are both continuously rotated through plus and minus 360.degree. but at different rotational rates to provide 3 axis error averaging of both gyro and accelerometer errors.
REFERENCES:
patent: 3147626 (1964-09-01), Fischer et al.
patent: 3258977 (1966-07-01), Hoffman
patent: 3269195 (1966-08-01), Cahoon et al.
patent: 3320819 (1967-05-01), Riordan et al.
patent: 3349630 (1967-10-01), Seliger et al.
patent: 3391568 (1968-07-01), Dozier
patent: 3456513 (1969-07-01), Emerson
patent: 3491228 (1970-01-01), Selvin
patent: 3517563 (1970-06-01), Will
patent: 3731544 (1973-05-01), Acker et al.
patent: 3875488 (1975-04-01), Crocker et al.
patent: 4123849 (1978-11-01), Maughmer
patent: 4159419 (1979-06-01), Wittke
patent: 4168524 (1979-09-01), Soltz et al.
patent: 4292854 (1981-10-01), Leibing
patent: 4442723 (1984-04-01), Auer
Bose Carl L.
Knobbe Edward J.
Anderson Terry J.
Buczinski Stephen C.
Hoch Jr. Karl J.
Northrop Grumman Corporation
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