04287809 is referenced by 173 patents and cites 15 patents.

An electromagnetic system for determining the orientation including position of a helmet worn by a pilot is disclosed, having a transmitting antenna for transmitting electromagnetic field vectors, a receiving antenna for sensing the electromagnetic field vectors, a control apparatus responsive to the sensed electromagnetic field vectors and the transmitted electromagnetic field vectors for determining the orientation including location of the helmet, the control apparatus having a first output for supplying the orientation to a utilization apparatus and a second output, a driver for supplying driving energy to the transmitting antenna coils, and a selector switch connected to the second output of the control apparatus and to the driver for sequentially energizing the coils of the transmitting antenna.

Title
Helmet-mounted sighting system
Application Number
6/68296
Publication Number
4287809
Application Date
August 20, 1979
Publication Date
September 8, 1981
Inventor
Jack E Wier
Roseville
MN, US
Dennis Kuhlmann
New Brighton
MN, US
Werner H Egli
Minneapolis
MN, US
Agent
Trevor B Joike
Assignee
Honeywell
MN, US
IPC
G01R 33/02
F41G 9/00
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