Error sensing system for vessels with absolute zero referencing

Details Error sensing system for vessels with absolute zero referencing Error sensing system for vessels with absolute zero referencing

1983-10-31

1986-01-14

Chin, Gary

Boots, shoes, and leggings

364571, 318588, 114144RE, 33363K, G05D 100

Patent

active

045649090

ABSTRACT:
An error sensing system for use in marine autopilot systems of the type having a photographic film compass disk aligned with the direction North and sensing means associated with the disk is operative to sense relative movement between the disk and the sensors in response to changes in the heading of the vessel. A first direction error surface portion on the disk has opaque and transparent areas defining a zero reference therebetween, a second magnitude error surface portion on the disk has a second zero reference position in predetermined relation to the first zero reference position and an area of variable transparency extending along the second surface portion. The first and second surface portions are defined by images along the peripheral surface of the photographic film disk. The disk sensing system has first and second light sensors aligned with the first and second surface portions, respectively, to generate direction error and magnitude error signals representative of the direction and extent of movement of the vessel away from a given heading.

REFERENCES:
patent: 3699420 (1972-10-01), Kundler et al.
patent: 3746842 (1973-07-01), Fowler
patent: 3833901 (1974-09-01), Fowler
patent: 3975621 (1976-08-01), Fowler
patent: 4040374 (1977-08-01), Greene
patent: 4101882 (1978-07-01), Kramer
patent: 4117602 (1978-10-01), Lapeyre
patent: 4190962 (1980-03-01), Lyman, Jr.
patent: 4414754 (1983-11-01), Lapeyre

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