Radar device and target angle detection method
First Claim
1. A radar device, comprising:
- a plurality of receiving antennas which receive, as a reception wave, a radar wave sent in a predetermined reference direction and reflected by a target;
a phase difference detection unit which detects a first phase difference of the reception wave received by a first receiving antenna pair that is spaced by a first gap, and a second phase difference of the reception wave received by a second receiving antenna pair that is spaced by a second gap smaller than the first gap; and
an angle detection unit which determines, as a detection angle, an angle of the target relative to the predetermined reference direction, whereinin a first process when a difference in the detection angles for a predetermined number of times in the past lies beyond a predetermined range, the angle detection unit determines, as the detection angle, an angle corresponding to mutually coincident angles from among a plurality of first angles corresponding to the first phase difference and a plurality of second angles corresponding to the second phase difference, orin a second process when a difference in the detection angles for a predetermined number of times in the past lies within the predetermined range, the angle detection unit determines, as the detection angle, an average of a first angle that is closest to a previous detection angle from among the plurality of first angles corresponding to the first phase difference, and a second angle that is closest to a previous detection angle from among the plurality of second angles corresponding to the second phase difference.
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Abstract
A radar device has a plurality of receiving antennas which receive, as a reception wave, a radar wave sent in a predetermined reference direction and reflected by a target; a phase difference detection unit which detects a first phase difference of the reception wave received by a first receiving antenna pair that is spaced by a first gap, and a second phase difference of the reception wave received by a second receiving antenna pair that is spaced by a second gap smaller than the first gap; and an angle detection unit which performs a first process of determining, as a detection angle, an angle of the target relative to the reference direction being a mutually coincident angle from among a plurality of first angles corresponding to the first phase difference and a plurality of second angles corresponding to the second phase difference. The radar device allows expanding an angle detection range without reducing the resolution of the angle corresponding to the second phase difference.
32 Citations
8 Claims
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1. A radar device, comprising:
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a plurality of receiving antennas which receive, as a reception wave, a radar wave sent in a predetermined reference direction and reflected by a target; a phase difference detection unit which detects a first phase difference of the reception wave received by a first receiving antenna pair that is spaced by a first gap, and a second phase difference of the reception wave received by a second receiving antenna pair that is spaced by a second gap smaller than the first gap; and an angle detection unit which determines, as a detection angle, an angle of the target relative to the predetermined reference direction, wherein in a first process when a difference in the detection angles for a predetermined number of times in the past lies beyond a predetermined range, the angle detection unit determines, as the detection angle, an angle corresponding to mutually coincident angles from among a plurality of first angles corresponding to the first phase difference and a plurality of second angles corresponding to the second phase difference, or in a second process when a difference in the detection angles for a predetermined number of times in the past lies within the predetermined range, the angle detection unit determines, as the detection angle, an average of a first angle that is closest to a previous detection angle from among the plurality of first angles corresponding to the first phase difference, and a second angle that is closest to a previous detection angle from among the plurality of second angles corresponding to the second phase difference. - View Dependent Claims (2, 3, 4, 5)
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6. An angle detection method, comprising:
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a step of receiving, as a reception wave, a radar wave sent in a predetermined reference direction and reflected by a target; a phase difference detection step of detecting a first phase difference of the reception wave received by a first receiving antenna pair that is spaced by a first gap, and a second phase difference of the reception wave received by a second receiving antenna pair that is spaced by a second gap smaller than the first gap; when a difference in the detection angles for a predetermined number of times in the past lies beyond a predetermined range, a first angle detection step for determining, as a detection angle, an angle of the target relative to the reference direction corresponding to mutually coincident angles from among a plurality of first angles corresponding to the first phase difference and a plurality of second angles corresponding to the second difference;
orwhen a difference in the detection angles for a predetermined number of times in the past lies within the predetermined range, a second angle detection step for determining, as a current detection angle, an average of a first angle that is closest to a previous detection angle from among the plurality of first angles corresponding to the first phase difference, and a second angle that is closest to a previous detection angle from among the plurality of second angles corresponding to the second phase difference. - View Dependent Claims (7, 8)
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Specification