Radar apparatus of automotive vehicle for producing accurate beam axis correction value
First Claim
1. A radar apparatus of an automotive vehicle, which corrects a beam emission axis in accordance with a correction value to eliminate an error of the beam emission axis to a straight line path of the vehicle with respect to a horizontal direction, comprising:
- a radar unit outputting signals at intervals of a predetermined time, each signal indicating data of a position of a target at an output time;
a position detecting unit detecting data of the position of the target from each of the signals output by said radar unit when the vehicle operates in the straight line path; and
a correction value determining unit generating a set of errors of the beam emission axis with respect to the horizontal direction so that an average of the errors with respect to each of the signals is determined from the data detected by said position detecting unit, and determining a correction value by taking an average of said averages of the errors with respect to all the signals.
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Abstract
A radar apparatus of an automotive vehicle includes a radar unit which outputs signals at intervals of a predetermined time, each signal indicating data of a position of a target at an output time. A position detecting unit detects data of the position of the target from the signals output by the radar unit when the vehicle operates in a straight line path. A correction value determining unit generates a set of errors of a beam emission axis to the straight line path with respect to a horizontal direction so that an average of the errors with respect to each of the signals is determined from the data detected by the position detecting unit. The correction value determining unit determines a correction value by taking an average of the averages of the errors with respect to all the signals.
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Citations
8 Claims
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1. A radar apparatus of an automotive vehicle, which corrects a beam emission axis in accordance with a correction value to eliminate an error of the beam emission axis to a straight line path of the vehicle with respect to a horizontal direction, comprising:
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a radar unit outputting signals at intervals of a predetermined time, each signal indicating data of a position of a target at an output time; a position detecting unit detecting data of the position of the target from each of the signals output by said radar unit when the vehicle operates in the straight line path; and a correction value determining unit generating a set of errors of the beam emission axis with respect to the horizontal direction so that an average of the errors with respect to each of the signals is determined from the data detected by said position detecting unit, and determining a correction value by taking an average of said averages of the errors with respect to all the signals. - View Dependent Claims (2, 3, 4)
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5. A radar apparatus of an automotive vehicle, which corrects a beam emission axis in accordance with a correction value to eliminate an error of the beam emission axis to a straight line path of the vehicle with respect to a horizontal direction, comprising:
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a radar unit outputting signals at intervals of a predetermined time, each signal indicating a scanned angle of a target as well as a relative distance of the target at an output time; a target detecting unit detecting the scanned angle and the relative distance of the target from each of the signals output by said radar unit when the target moves forward in a roadway lane different from a roadway lane of the vehicle or when the target is a fixed road-side object; and a correction value determining unit generating changes of the scanned angle and the relative distance of the target detected by said target detecting unit within a period from an initial output time to a final output time, and determining a correction value from said changes so that an error of the beam emission axis to the straight line path of the vehicle with respect to the horizontal direction is eliminated. - View Dependent Claims (6, 7, 8)
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Specification