Gradient reflector location sensing system

Details Gradient reflector location sensing system Gradient reflector location sensing system

1993-11-30

1995-06-13

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

2502062, 2502032, 3561415, 345 8, G01B 1126

Patent

active

054245567

ABSTRACT:
A multi-band high-speed videometric head tracking system having a gradient reflector array attached to a helmet on a person's head, ultraviolet light source emitting light which is reflected by the reflector array to a video camera which provides an image to a spot location estimator providing accurate locations of spots in the image representing the reflectors' reflecting light to image location accuracies within a pixel of the image. The location information from the spot location estimator goes to a track point 3-D location and helmet LOS estimator that provides location and orientation information to a Kalman Filter that accurately estimates and predicts the helmet position at faster rates than would be possible for a process that uses just the image-based measurements of the helmet.

REFERENCES:
patent: 3917412 (1975-11-01), Stoutmeyer et al.
patent: 4111555 (1978-09-01), Ellis
patent: 4475814 (1984-10-01), Marche
patent: 4649504 (1987-03-01), Krouglicof et al.
patent: 4956794 (1990-09-01), Zeevi et al.
patent: 5208641 (1993-05-01), Mocker et al.

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