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System for estimating the speed of an aircraft, and an application thereof to detecting obstacles

Image Number 10 for United States Patent #7791529.

The invention relates to a method of determining an estimated speed of an aircraft relative to ground being overflown by the aircraft, in which use is made of the sum of an acceleration measurement of the aircraft plus a difference value, the difference value being obtained from observation data or signals relating to a region of the ground.

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