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Object detecting method and object detector
| Details |
Inventors: Nishiguchi, Tadao; Okamura, Shinichiro; Furukawa, Hirohisa;
Assignee: Omron Corporation (Kyoto, JP)
Primary Examiner: Sotomayor; John B.
Assistant Examiner:
Attorney, Agent or Firm: Dickstein Shapiro Morin & Oshinsky LLP
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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DETAILED DESCRIPTION The present invention was made in view of the above problems and it is an object of the present invention to provide technique capable of detecting an object with a simple and inexpensive constitution, in which directional error detection is not hardly generated and bearing resolution is high.
In addition, it is a second object of the present invention to provide technique capable of detecting an object without the directional error detection even with an antenna having low performance of sidelobe suppression.
Furthermore, it is a third object of the present invention to provide technique capable of improving bearing resolution without varying a variation amount of a mainlobe irradiation direction.
The inventors of the present invention have studied the technique earnestly, to solve the above problems in the prior art.
The summary thereof is described hereinafter.
Conventionally, as a measure to prevent the directional error detection, research and development for the purpose of improvement of the sidelobe suppression performance or removal of a sidelobe signal have been the mainstream.
However, this approach has a limit in implementing simplicity of the constitution, reduction in designing and manufacturing costs, improvement of the bearing resolution and the like.
Thus, the inventors of the present invention got an idea that the echo obtained from the sidelobe could be used for object detection instead of removing the sidelobe as a noise.
However, even when only the reflection power intensity in one direction is analyzed, it is not easy to distinguish whether it is obtained from the mainlobe or the sidelobe.
This is because the reflection power intensity is varied depending on the size of the object and distance up to the object, as well as intensity of an irradiated beam but also the size of the object and distance up to the object.
Then, the inventors of the present invention focused attention on a rule of the directional characteristics of the antenna.
In general, the directional characteristics of the antenna comprises the mainlobe in which a gain (highness of radiation performance) is the maximum and the plural sidelobes repetitively appearing on both sides thereof
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