Vehicle tracking control for continuously detecting the distance and direction to a preceding vehicle irrespective of background dark/light distribution
First Claim
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1. An automobile radar apparatus comprising:
- light source means installed at a predetermined position on a rear side of a preceding vehicle, for projecting light backwards;
a pair of spaced-apart light-receiving optical systems separately positioned on a front side of a self-vehicle (tracking vehicle), each of said optical systems having a respective light-receiving light path for receiving and focusing the light emitted from said light source means into an image;
at least one photoelectric transducer provided at a focal plane of each light-receiving light path, for converting said focused image into electrical output signals;
image formation position calculating means for calculating image formation positions in a horizontal direction at the focal plane with respect to the two light-receiving paths based upon outputs of the photoelectric transducer(s);
rotating means for rotating said light-receiving optical systems in the horizontal direction, and,angle detecting means for detecting a turning angle of said light-receiving optical system driven by the rotating means,wherein said light-receiving optical systems are rotated in response to an output from said image formation position calculating means to realign the light-receiving paths of said light-receiving optical systems with said light source, a direction of the preceding vehicle is calculated based on an output from said angle detecting means, and a distance up to the preceding vehicle is calculated based on the output from said image formation position calculating means.
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Abstract
In an automobile radar apparatus according to the present invention, a light-receiving optical system is rotated in response to an output from an image formation position calculation unit in such a manner that light source is focused on a vertical plane containing an optical axis of the light-receiving optical system; a direction up to the preceding vehicle is calculated from a turning angle in response to an output derived from an angular detecting unit; and a distance up to the preceding vehicle is calculated from an image position of the light source based upon an output derived from the image formation calculation unit.
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11 Claims
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1. An automobile radar apparatus comprising:
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light source means installed at a predetermined position on a rear side of a preceding vehicle, for projecting light backwards; a pair of spaced-apart light-receiving optical systems separately positioned on a front side of a self-vehicle (tracking vehicle), each of said optical systems having a respective light-receiving light path for receiving and focusing the light emitted from said light source means into an image; at least one photoelectric transducer provided at a focal plane of each light-receiving light path, for converting said focused image into electrical output signals; image formation position calculating means for calculating image formation positions in a horizontal direction at the focal plane with respect to the two light-receiving paths based upon outputs of the photoelectric transducer(s); rotating means for rotating said light-receiving optical systems in the horizontal direction, and, angle detecting means for detecting a turning angle of said light-receiving optical system driven by the rotating means, wherein said light-receiving optical systems are rotated in response to an output from said image formation position calculating means to realign the light-receiving paths of said light-receiving optical systems with said light source, a direction of the preceding vehicle is calculated based on an output from said angle detecting means, and a distance up to the preceding vehicle is calculated based on the output from said image formation position calculating means. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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Specification