Navigational instrument

Details Navigational instrument Navigational instrument

1976-02-23

1978-04-11

Buczinski, S. C.

Optics: measuring and testing

Angle measuring or angular axial alignment

Apex of angle at observing or detecting station

33268, 250203R, 250231SE, G01B 1126

Patent

active

040836363

ABSTRACT:
A navigational system for spacecraft use utilizes two telescopes gimbaled on a common axis to measure the scalar angle between a star and the lunar limb. The common axis is the axis of rotation of a momentum wheel carrying a narrow mirror. When each tracker is aligned at its respective target, the mirror passes through the respective optical axis of the telescopes. Timing sensors record the passage to measure the angle and its complement. The phase locked loop used to maintain precision angular rotational rates of the momentum wheel is disclosed such that approximately 20 statistical measurements of the included angle per second can be made.

REFERENCES:
patent: 2758377 (1956-08-01), Claret et al.
patent: 3001289 (1961-09-01), Carbonara
patent: 3293980 (1966-12-01), Benedetti
patent: 3448272 (1969-06-01), Slater
patent: 3953132 (1976-04-01), Michelson

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