Dead reckoning system for vehicles
First Claim
1. A system comprising:
- a first digital imaging device and a second digital imaging device, each digital imaging device configured to capture multiple pixel two-dimensional digital images of a stochastic surface traveled by a vehicle, the first digital imaging device and the second digital imaging device coupled to the vehicle;
a digital image correlator configured to (i) correlate a first digital image of the stochastic surface captured by the first digital imaging device at a first time and a second digital image of the stochastic surface captured by the second digital imaging device at a subsequent second time, and (ii) determine a correlation vector, wherein the first digital image acquired by the first digital imaging device and the second digital image acquired by the second imaging device;
a kinematics circuit configured to determine in response to the correlation vector an incremental translation and rotation of the vehicle between the first time and the second time; and
a navigation circuit configured to combine at least two instances of the incremental translation and rotation of the vehicle into data indicative of an acceleration, speed, distance, direction, or course traveled by the vehicle during a period of time.
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Abstract
Described embodiments include a system and method. A system includes a first and second digital imaging devices. Each digital imaging device is configured to capture digital images of a surface traveled by a vehicle. A digital image correlator is configured to (i) correlate a first digital image of the surface captured by a first digital imaging device at a first time and a second digital image of the surface captured by a second digital imaging device at a subsequent second time, and (ii) determine a correlation vector. The first and second imaging devices are separated by a known distance. A kinematics circuit is configured to determine in response to the correlation vector an incremental translation and rotation of the vehicle. The system includes a navigation circuit configured to combine at least two instances of the incremental translation and rotation into data indicative of travel by the vehicle.
20 Citations
41 Claims
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1. A system comprising:
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a first digital imaging device and a second digital imaging device, each digital imaging device configured to capture multiple pixel two-dimensional digital images of a stochastic surface traveled by a vehicle, the first digital imaging device and the second digital imaging device coupled to the vehicle; a digital image correlator configured to (i) correlate a first digital image of the stochastic surface captured by the first digital imaging device at a first time and a second digital image of the stochastic surface captured by the second digital imaging device at a subsequent second time, and (ii) determine a correlation vector, wherein the first digital image acquired by the first digital imaging device and the second digital image acquired by the second imaging device; a kinematics circuit configured to determine in response to the correlation vector an incremental translation and rotation of the vehicle between the first time and the second time; and a navigation circuit configured to combine at least two instances of the incremental translation and rotation of the vehicle into data indicative of an acceleration, speed, distance, direction, or course traveled by the vehicle during a period of time. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30)
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31. A method comprising:
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capturing at a first time a first digital image of a stochastic surface being traveled by a vehicle; capturing at a second time subsequent to the first time a second digital image of the stochastic surface being traveled; correlating the first digital image and the second digital image, and determining a correlation vector; determining responsive to the correlation vector an incremental translation and rotation of the vehicle between the first time and the second time; and combining at least two instances of the incremental translation and rotation of the vehicle into data indicative of an acceleration, speed, distance, direction, or course traveled by the vehicle during a period of time. - View Dependent Claims (32, 33, 34, 35, 36, 37)
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38. a system comprising:
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means for capturing at a first time a first digital image of a stochastic surface being traveled by a vehicle; means for capturing at a second time subsequent to the first time a second digital image of the stochastic surface being traveled; means for correlating the first digital image and the second digital image, and determining a correlation vector means for determining responsive to the correlation vector an incremental translation and rotation of the vehicle between the first time and the second time; and means for combining at least two instances of the incremental translation and rotation of the vehicle into data indicative of an acceleration, speed, distance, direction, or course traveled by the vehicle during a period of time. - View Dependent Claims (39, 40, 41)
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Specification