Radar apparatus
First Claim
1. A radar apparatus of an electronic scan type configured to transmit an electric wave and calculate an angle of a target based on a phase difference of respective reception signals which are obtained by receiving reflected waves at a plurality of receiving antennae, thereby detecting a target position, the radar apparatus comprising:
- an antenna unit configured to transmit and receive the electric wave and provided with two transmission antennae;
a transmission unit configured to alternately transmit an electric wave having a first beam pattern and an electric wave having a second beam pattern from the two transmission antennae, the first beam pattern and the second beam pattern being different from each other;
a first reception unit configured to calculate an arrival angle and a reception level of a reflected wave calculated from respective reception signals which are obtained by receiving the reflected wave by the first beam pattern;
a second reception unit configured to calculate an arrival angle and a reception level of a reflected wave calculated from respective reception signals which are obtained by receiving the reflected wave by the second beam pattern;
a comparison unit configured to compare the reception levels calculated by the first and second reception units by combining the arrival angles of the reflected waves, and determine (i) whether a level difference between the reception level calculated by the first reception unit and the reception level calculated by the second reception unit is a predetermined reception level difference or greater and (ii) whether the reception level calculated by the first reception unit is greater than the reception level calculated by the second reception unit; and
a determination unit configured to determine a location of a target in accordance with a determination result of the comparison unit such that whether the target actually exists at the arrival angles of the reflected waves and a direction of the target when the target does not actually exist at the arrival angles of the reflected waves.
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Accused Products
Abstract
There is provided a radar apparatus of an electronic scan type configured to transmit an electric wave and calculate an angle of a target based on a phase difference of respective reception signals, thereby detecting a target position. An antenna unit transmits and receives the electric wave and provided with two transmission antennae. A transmission unit alternately transmits an electric wave having a first beam pattern and an electric wave having a second beam pattern from the two transmission antennae. First and second reception units calculate arrival angles and reception levels of reflected waves calculated from respective reception signals which are obtained by receiving the reflected waves by the first and second beam patterns. A comparison unit compares the reception levels by combining the arrival angles of the reflected waves. A determination unit determines whether a target actually exists at the arrival angles in accordance a comparison result.
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Citations
9 Claims
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1. A radar apparatus of an electronic scan type configured to transmit an electric wave and calculate an angle of a target based on a phase difference of respective reception signals which are obtained by receiving reflected waves at a plurality of receiving antennae, thereby detecting a target position, the radar apparatus comprising:
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an antenna unit configured to transmit and receive the electric wave and provided with two transmission antennae; a transmission unit configured to alternately transmit an electric wave having a first beam pattern and an electric wave having a second beam pattern from the two transmission antennae, the first beam pattern and the second beam pattern being different from each other; a first reception unit configured to calculate an arrival angle and a reception level of a reflected wave calculated from respective reception signals which are obtained by receiving the reflected wave by the first beam pattern; a second reception unit configured to calculate an arrival angle and a reception level of a reflected wave calculated from respective reception signals which are obtained by receiving the reflected wave by the second beam pattern; a comparison unit configured to compare the reception levels calculated by the first and second reception units by combining the arrival angles of the reflected waves, and determine (i) whether a level difference between the reception level calculated by the first reception unit and the reception level calculated by the second reception unit is a predetermined reception level difference or greater and (ii) whether the reception level calculated by the first reception unit is greater than the reception level calculated by the second reception unit; and a determination unit configured to determine a location of a target in accordance with a determination result of the comparison unit such that whether the target actually exists at the arrival angles of the reflected waves and a direction of the target when the target does not actually exist at the arrival angles of the reflected waves. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A radar apparatus of an electronic scan type configured to transmit an electric wave and calculate an angle of a target based on a phase difference of respective reception signals which are obtained by receiving reflected waves at a plurality of receiving antennae, thereby detecting a target position, the radar apparatus comprising:
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an antenna unit configured to transmit and receive the electric wave and provided with two transmission antennae; a transmission unit configured to alternately transmit an electric wave having a first beam pattern and an electric wave having a second beam pattern from the two transmission antennae, the first beam pattern and the second beam pattern being different from each other; a first reception unit configured to calculate an arrival angle and a reception level of a reflected wave calculated from respective reception signals which are obtained by receiving the reflected wave by the first beam pattern; a second reception unit configured to calculate an arrival angle and a reception level of a reflected wave calculated from respective reception signals which are obtained by receiving the reflected wave by the second beam pattern; a comparison unit configured to compare the reception levels calculated by the first and second reception units by combining the arrival angles of the reflected waves; and a determination unit configured to determine a location of a target in accordance with a comparing result of the comparison unit such that whether the target actually exists at the arrival angles of the reflected waves and a direction of the target when the target does not actually exist at the arrival angles of the reflected waves.
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Specification