Radar apparatus and signal processing method
First Claim
1. A radar apparatus capable of extracting peak signals obtained from a difference frequency between a transmitting signal of which a frequency is changed in a predetermined period, and a receiving signal obtained by receiving a reflection wave of a transmission wave based on the transmitting signal at a target, during a first period in which the frequency of the transmitting signal ascends, and a second period in which the frequency of the transmitting signal descends, and deriving information about the target based on the extracted peak signals, the radar apparatus comprising:
- a pairing unit configured to pair a peak signal extracted in the first period and a peak signal extracted in the second period; and
a judging unit configured to judge whether or not the target is an overhead object based on the number of paired data of stationary objects existing within a predetermined range from the radar apparatus and being arranged at a substantially regular interval in a traveling direction of a vehicle on which the radar apparatus is mounted, among the paired data obtained by pairing the peak signals in the pairing unit,wherein if the target has been judged as the overhead object for a number of times within a predetermined time and the number of times exceeds a predetermined number, the judging unit subsequently executes a relaxed judging process based on a threshold that is lower than a predetermined threshold for determining an overhead object.
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Accused Products
Abstract
There is provided a radar apparatus capable of extracting a peak signal obtained from a difference frequency between a transmitting signal and a receiving signal during first and second periods and deriving target information based on the extracted peak signals. A pairing unit pairs the peak signals extracted in the first and second periods. A judging unit judges whether or not the derived target is an overhead object based on the number of paired data of a stationary object existing within a predetermined range from the radar apparatus, among the paired data obtained by pairing the peak signals in the pairing unit.
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Citations
10 Claims
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1. A radar apparatus capable of extracting peak signals obtained from a difference frequency between a transmitting signal of which a frequency is changed in a predetermined period, and a receiving signal obtained by receiving a reflection wave of a transmission wave based on the transmitting signal at a target, during a first period in which the frequency of the transmitting signal ascends, and a second period in which the frequency of the transmitting signal descends, and deriving information about the target based on the extracted peak signals, the radar apparatus comprising:
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a pairing unit configured to pair a peak signal extracted in the first period and a peak signal extracted in the second period; and a judging unit configured to judge whether or not the target is an overhead object based on the number of paired data of stationary objects existing within a predetermined range from the radar apparatus and being arranged at a substantially regular interval in a traveling direction of a vehicle on which the radar apparatus is mounted, among the paired data obtained by pairing the peak signals in the pairing unit, wherein if the target has been judged as the overhead object for a number of times within a predetermined time and the number of times exceeds a predetermined number, the judging unit subsequently executes a relaxed judging process based on a threshold that is lower than a predetermined threshold for determining an overhead object. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A signal processing method capable of extracting peak signals obtained from a difference frequency between a transmitting signal of which a frequency is changed in a predetermined period, and a receiving signal obtained by receiving a reflection wave of a transmission wave based on the transmitting signal at a target, during a first period in which the frequency of the transmitting signal ascends, and a second period in which the frequency of the transmitting signal descends, and deriving information about the target based on the extracted peak signals, the signal processing method comprising:
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(a) pairing, by a pairing unit of a radar apparatus, a peak signal extracted in the first period and a peak signal extracted in the second period; (b) judging, by a judging unit of the radar apparatus, whether or not the target is an overhead object based on the number of paired data of stationary objects existing within a predetermined range from the radar apparatus and being arranged at a substantially regular interval in a traveling direction of a vehicle on which the radar apparatus is mounted, among the paired data obtained by pairing the peak signals in the step (a), and (c) if the target has been judged as the overhead object for a number of times within a predetermined time and the number of times exceeds a predetermined number, executing a relaxed judging process based on a threshold that is lower than a predetermined threshold for determining an overhead object.
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Specification