NASA NTRS · 19910000255
Low-Speed Optical Speedometer
Abstract
Proposed speedometer measures speed of vehicle along ground by comparing signals from two inexpensive sensors focused on surface passing beneath vehicle. Delay between terrain-reflectance signals from two optical sensors indicates speed. Used to measure speeds as low as 10 cm/s.
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Shimada, Katsunori. 1991-06-01. Low-Speed Optical Speedometer. https://ntrs.nasa.gov/citations/19910000255
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