Radar apparatus and method of measuring azimuth angle of target
AssigneeHitachi, Ltd.
InventorsMitsutoshi Morinaga, Hiroto Mitoma
Life of this patent
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Abstract
A radar apparatus capable of determining the position of targets at a high accuracy even when plural objects of an identical relative velocity are present in a detection view field of the radar, using signal processing of obtaining an effect which is similar with that of virtually increasing the number of antennas along the moving direction of the radar by determining the change of intensity of reception signals using data in the past in which an identical antenna was positioned at a slightly different place (T1) and data at present (T1+ΔT) as a unit data set.
Claims20
A radar apparatus including a transmission antenna for transmitting transmission waves to a detection region, a pair of reception antennas disposed being opposed to each other and receiving reflection waves from a target, and a signal processing circuit having a function of processing the reception signals,
- wherein the signal processing circuit virtually doubles the number of antennas by combining a first data obtained by the pair of reception antennas and a second data obtained at a time different from that for the first data as reception signals into a unit data set, and
- wherein the signal processing circuit determines the change of intensity of the reception signals based on the unit data set and measures the position for the plurality of targets.
A radar apparatus including an analog circuit having a generating function, transmission function and reception function of signals, and a signal processing circuit having a processing function of reception signals,
- wherein the analog circuit has a transmission antenna for transmitting transmission waves to a detection region and a pair of reception antennas disposed being opposed to each other,
- wherein the signal processing circuit processes the reflection wave of the received transmission waves as a reception signal and tracks the target,
- wherein the signal processing circuit virtually doubles the number of antennas by combining a first data obtained by the pair of reception antennas and a second data obtained at a time different from that of the first data as reception signals into a unit data set, and
- wherein the signal processing circuit measures the positions for the azimuth angles of the plurality of the targets by using the unit data set.
A method of measuring an azimuth angle of a tangent in a radar apparatus including a transmission antenna, a pair of reception antennas disposed being opposed to each other, and a signal processing circuit having a function of processing reception signals, the method comprising the steps of:
- transmitting transmission waves from the one transmission antenna to a detection region;
- receiving the reflection waves of the transmission waves by the pair of reception antennas disposed being opposed to each other;
- combining a first data obtained by the pair of reception antennas and a second data obtained at a time different from the first data as a unit data set of reception signals;
- and
- determining the change of intensity of the reception signals from the unit data set and measuring the position for the azimuth angle of the plurality of targets.
Dependencies are inferred from the claim text.