Apparatus for measuring the angular displacement of a body
First Claim
1. A system for defining the line of sight of an observer relative to a vehicle in which said observer is traveling by measuring the angular displacement of headgear worn by said observer with respect to a coordinate reference frame, said system comprising:
- A. means for emitting radiation fromi. two sets of pointsii. of at least three non-colinear points per set,B. said two sets of points being fixed with respect to said headgear; and
C. means for sensing, independently at each of two viewing positions, the angular positions of a set of points respectively associated with each viewing position and with respect to said reference frame over a range of angular displacement of said headgear,i. said viewing positions being fixed with respect to said coordinate reference frame, andii. the fields of view from said two viewing positions being different and partially overlapping,D. thereby to obtain a measurement of said angular position and so to define the line of sight over a wide range of angular movement of said headgear.
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Abstract
A helmet sight system for use in an aircraft in which the angular displacement of the helmet in the reference frame of the aircraft is measured by measurement of the angular displacement of a set of three non-colinear radiation sources, fixed with respect to the helmet, whose angular positions are sensed by a sensor which is fixed with respect to the coordinate reference frame of the aircraft. The radiation sources may be light emitting diodes and the sensor may comprise an aperture having two mutually inclined rectilinear slits and an array of light sensitive charge coupled devices.
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Citations
7 Claims
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1. A system for defining the line of sight of an observer relative to a vehicle in which said observer is traveling by measuring the angular displacement of headgear worn by said observer with respect to a coordinate reference frame, said system comprising:
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A. means for emitting radiation from i. two sets of points ii. of at least three non-colinear points per set, B. said two sets of points being fixed with respect to said headgear; and C. means for sensing, independently at each of two viewing positions, the angular positions of a set of points respectively associated with each viewing position and with respect to said reference frame over a range of angular displacement of said headgear, i. said viewing positions being fixed with respect to said coordinate reference frame, and ii. the fields of view from said two viewing positions being different and partially overlapping, D. thereby to obtain a measurement of said angular position and so to define the line of sight over a wide range of angular movement of said headgear. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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Specification