Object detecting method and object detector
First Claim
1. An object detecting method comprising:
- a step of irradiating beams in a plurality of directions by switching an irradiation direction of a mainlobe of an antenna by stages;
a step of receiving an echo from a detection object obtained in the mainlobe or a sidelobe in each irradiation direction;
a step of finding reflection power intensity in each irradiation direction from the received echo; and
a step of specifying a bearing in which the detection object exists based on a pattern of relative variation of the reflection power intensity in each irradiation direction.
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Abstract
Beams are irradiated in three directions by switching an irradiation direction of a mainlobe of an antenna by stages, and an echo is received from a detection object obtained in the mainlobe or a sidelobe in each irradiation direction. Then, reflection power intensity in each irradiation direction is found from the received echo, and pattern of relative variation of the reflection power intensity (power intensity pattern) in each irradiation direction is generated. Meanwhile, a detection region is divided into seven bearings “c” to “i” and a power intensity pattern when an object exists in each bearing is previously stored as a reference pattern in each bearing. Then, the bearing in which the detection object exists is specified by comparing the power intensity pattern obtained from the received echo with the reference pattern in each bearing.
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Citations
10 Claims
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1. An object detecting method comprising:
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a step of irradiating beams in a plurality of directions by switching an irradiation direction of a mainlobe of an antenna by stages;
a step of receiving an echo from a detection object obtained in the mainlobe or a sidelobe in each irradiation direction;
a step of finding reflection power intensity in each irradiation direction from the received echo; and
a step of specifying a bearing in which the detection object exists based on a pattern of relative variation of the reflection power intensity in each irradiation direction. - View Dependent Claims (2, 3, 4, 5)
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6. An object detector comprising:
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an antenna irradiating beams in a plurality of irradiation directions by switching an irradiation direction of a mainlobe by stages, and receiving an echo from a detection object obtained in the mainlobe or a sidelobe in each irradiation direction;
means for finding reflection power intensity in each irradiation direction from the received echo; and
means for specifying a bearing in which the detection object exists based on a pattern of relative variation of the reflection power intensity in each irradiation direction. - View Dependent Claims (7, 8, 9, 10)
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Specification