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System for measuring the angular displacement of an object

  • US 4,896,962 A
  • Filed: 05/26/1988
  • Issued: 01/30/1990
  • Est. Priority Date: 06/01/1987
  • Status: Expired due to Fees
First Claim
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1. A helmet line of sight measuring system for determining the spatial location of a helmet and the line of sight of an observer wearing said helmet, both relative to a coordinate reference frame, said system comprising:

  • a plurality of assemblies of light sources distributed on said helmet, each assembly comprising three light sources positioned at the vertices of a triangle and a fourth light source outside the plane of said triangle, there being a predetermined geometry associated with said light sources;

    optical means fixed in space relative to said coordinate reference frame for imaging the light emitting by the light sources in at least one of said assemblies onto an area image sensor located a predetermined distance from said optical means producing two-dimensional image data of said light sources on said area image sensor; and

    computing means coupled to said area image sensor and responsive to said predetermined geometry and said predetermined distance for determining the spatial coordinates of said helment from said image data.

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