Radar device
First Claim
1. A radar device which transmits an electric wave, receives a reflected wave of said electric wave from an object, and thereby detects said object, said radar device comprising:
- a plurality of antennas each having an antenna beam pattern having a predetermined directivity, said antennas being arranged such that the antenna beam patterns of said antennas are adjacent to each other, and the antenna beam patterns are partly overlapping with each other,frequency measurement means for measuring a frequency of how often said object is detected by each of said antennas, andazimuth measurement means for obtaining an azimuth of said detected object, based on (i) said measured frequency for each of said antennas and (ii) beam pattern characteristics of each of said antennas.
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Accused Products
Abstract
A radar device transmits an electric wave whose band is spread by a PN code, receives a reflected wave of the electric wave from an object 10, detects correlation between a received signal and a PN code which is delayed, and thereby detects the object. A receiving part 18 connects three receiving antennas 16a˜16c sequentially one by one, thereby to receive a reflected wave from an object. The three receiving antennas are arranged having their directions so staggered that their antenna beam patterns partly overlap with each other. A correlation detection circuit 19 detects such a slide width that a value of correlation between a received signal received by each of the antennas and the PN code exceeds a predetermined threshold. An operation part 12 obtains an azimuth of an object based on the detected slide width and beam pattern characteristics of the antennas.
117 Citations
12 Claims
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1. A radar device which transmits an electric wave, receives a reflected wave of said electric wave from an object, and thereby detects said object, said radar device comprising:
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a plurality of antennas each having an antenna beam pattern having a predetermined directivity, said antennas being arranged such that the antenna beam patterns of said antennas are adjacent to each other, and the antenna beam patterns are partly overlapping with each other, frequency measurement means for measuring a frequency of how often said object is detected by each of said antennas, and azimuth measurement means for obtaining an azimuth of said detected object, based on (i) said measured frequency for each of said antennas and (ii) beam pattern characteristics of each of said antennas. - View Dependent Claims (2)
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3. A radar device which transmits an electric wave, receives a reflected wave of said electric wave from an object, and thereby detects said object, said radar device comprising:
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a plurality of antennas each having an antenna beam pattern having a predetermined directivity, said antennas being arranged such that the antenna beam patterns of said antennas are adjacent to each other, and the antenna beam patterns are partly overlapping with each other, frequency measurement means for measuring a frequency of how often said object is detected by each of said antennas, signal strength measurement means for measuring a strength of a received signal from said object, received by each of said antennas, and azimuth measurement means for obtaining an azimuth of said detected object, based on (i) said measured frequency for each of said antennas, (ii) said measured signal strength and (iii) beam pattern characteristics of each of said antennas. - View Dependent Claims (4, 5, 6, 7, 8, 9)
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10. A radar device which transmits an electric wave, receives a reflected wave of said electric wave from an object, and thereby detects said object, said radar device comprising:
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a plurality of antennas each having an antenna beam pattern having a predetermined directivity, said antennas being arranged such that the antenna beam patterns of said antennas are adjacent to each other, and the antenna beam patterns are partly overlapping with each other, frequency measurement means for measuring a frequency of how often said object is detected by each of said antennas, signal strength measurement means for measuring a strength of a received signal from said object, received by each of said antennas, and azimuth measurement means for obtaining an azimuth of said detected object, based on (i) said measured frequency for each of said antennas, (ii) said measured signal strength and (iii) beam pattern characteristics of each of said antennas, and tracking means for tracking an object, wherein said plurality of antennas comprise at least three antennas, and said azimuth measurement means stores in advance a conversion function for obtaining a corresponding azimuth from a signal strength ratio of adjacent beams, compares measured values of signal strength of the respective beams with each other, thereby to judge whether said object is detected by a side lobe of each beam or detected by a main lobe of each beam or detected due to false tracking by said tracking means, calculates a signal strength ratio of beams based on such values of strength of received signals that are judged to be detected by main lobes of beams, and obtains an azimuth of said object utilizing said stored conversion function based on said calculated signal strength ratio. - View Dependent Claims (11, 12)
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Specification