Method and apparatus for establishing a north reference for inertial measurement units using scene correlation
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United States of America Patent
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Aug 16, 2016
Grant Date -
Apr 9, 2015
app pub date -
Oct 3, 2014
filing date -
Oct 3, 2013
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Abstract
A scene correlation-based target system and related methods are provided. A reference image depicts a remotely-positioned object having identifiable characteristics, wherein a reference directional vector is established relative to the reference image. A target image of a general vicinity of the remotely-positioned object has an unknown directional vector, the target image having at least a portion of the identifiable characteristics. An inertial measuring unit has a scene correlation system, wherein the scene correlation system matches the portion of the identifiable characteristics of the target image with the identifiable characteristics of the reference image, wherein a slew angle between the reference image and the target image is calculated. A target image directional vector is derived from the calculated slew angle and the reference directional vector.
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