0294101-A2 is referenced by 100 patents and cites 6 patents.

An improved helmet line of sight measuring system for determining the spatial location of a helmet (1) and the line of sight of an observer wearing the helmet (8), both relative to a coordinate reference frame. A plurality of assemblies (2) of light sources are distributed on the helmet (8) each comprising three light sources positioned at the vertices of a triangle (10, 11, 12) and a fourth light source (13) outside the plane of the triangle. Optical means (3, 14) fixed in space relative to the coordinate reference frame image the light emitted by the light sources in at least one of the assemblies onto an area image sensor (4), thereby producing two-dimensionsal image data of the light sources on the plane of the image sensor (15). Computing means (6) coupled to the area image sensor (4, 15) is thereby able to determine the spatial coordinates of the helmet (1) from the image data.

Title
System for measuring the angular displacement of an object.
Application Number
EP19880304776 19880526
Publication Number
0294101 (A2)
Application Date
May 26, 1988
Publication Date
December 7, 1988
Inventor
Krimerman Joseph
Menn Anatoly
Assignee
Electro Optics
IL
IPC
G01S 05/16
F41G 03/22
F41G 03/00
F41G 03/22
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