JP2952356B1 - Rotation angle detection method of obstacle detection radar - Google Patents

Abstract

A method of detecting a rotation angle of an obstacle detection radar, which does not require an angle detection device such as a rotary encoder and can detect the rotation angle of the radar with a simple mechanism. SOLUTION: In a millimeter wave obstacle detection radar in which a transmitting antenna and a receiving antenna are juxtaposed and these antennas are rotatable by a rotating mechanism, a transmitting antenna 1
And a reflector 10 is installed in front of the midpoint of the receiving antenna 2 and the rotation angle of the radar is detected based on the reflection intensity.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for detecting a rotation angle of an obstacle detection radar.

[0002]

2. Description of the Related Art Conventionally, when an obstacle in a range is detected by a radar and its position is estimated, it is necessary to scan a plane with a thin radar beam. At this time, a rotary encoder or the like is provided to detect the rotation angle, and the rotation angle is detected by reading the value.

[0003] By the way, angle detection by a conventional obstacle detection radar as described above requires an angle detection device such as a rotary encoder.

[0004]

SUMMARY OF THE INVENTION Accordingly, the present invention solves the above-mentioned conventional problems, and does not require an angle detecting device such as a rotary encoder, and detects the rotation angle of a radar by a simple mechanism. It is an object of the present invention to provide a method of detecting a rotation angle of an obstacle detection radar capable of detecting a rotation angle.

[0005]

In order to achieve the above object, the present invention relates to a millimeter-wave obstacle detecting radar in which a transmitting antenna and a receiving antenna are juxtaposed and these antennas are rotatable by a rotating mechanism. A reflector is fixedly installed in front of an intermediate point between the antenna and the receiving antenna, and the rotation angle of the radar is detected based on the reflection intensity. That is, a simple rotation angle detection mechanism is provided for the radar alone in detecting the rotation angle. In this case, the transmitting antenna and the receiving antenna are oriented in the same direction in the radome and are installed at a certain distance. The transmitting antenna and the receiving antenna are fixed so as to always rotate at the same angle.
The beam patterns of the transmitting antenna and the receiving antenna are composed of a main lobe and side lobes. At this time, a reflector is provided in front of the intersection of the reception antenna side lobe and the transmission antenna side lobe in the radome. This reflector is fixed to the radome. The current rotation angle is detected from the reflected wave of the reflector. More specifically, when the transmitting antenna and the receiving antenna are rotated, reflected waves at one main lobe and two side lobes are observed within one rotation. This reflection occurs periodically, and the distance is 0 m.
It becomes a reflected wave in the vicinity. That is, three reflected waves near 0 m are generated during one rotation. Since this reflected wave is always generated regardless of the presence or absence of the obstacle detected by the radar, the angle at which the radio wave is emitted can be determined from the cycle of the three waves. In the above, one or more reflectors may be installed.

[0006]

An embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a drawing of the embodiment viewed from above. 1 is a transmitting antenna, 2 is a receiving antenna, 3 is a main lobe of the receiving antenna, 4 is a side lobe of the receiving antenna (1), 5 is a side lobe of the receiving antenna (2), 6 is a main lobe of the transmitting antenna, and 7 is a main lobe of the transmitting antenna. The side lobes (1) and 8 of the transmitting antenna are the side lobes (2) of the transmitting antenna, 9 is a radome, 10 is an angle detecting reflector, and 11 is a rotation center.

The transmitting antenna 1 and the receiving antenna 2 are installed on the same jig (not shown) and rotate. Now the center of rotation
When the radar rotates clockwise by 11, the reflected wave of the side lobe (2) 8 of the transmitting antenna is received by the reflector 10 and detected by the radar modem 12 as a signal at a distance of 0 m. Next, when the antenna is rotated, the beam reflected wave of the main lobe 6 of the transmitting antenna has a distance of 0 m.
Is detected by When it is further rotated, it is similarly detected at a distance of 0 m by the beam of the side lobe (1) 7 of the transmitting antenna. When the rotation is further continued, the same phenomenon occurs with one rotation, and a reflected wave at a distance of 0 m is detected three times during one rotation. By measuring the reflected waves three times in one cycle, the emission direction of the beam can be determined. As a result, the rotation angle of the radar can be detected by a device having no rotation detection unit such as a rotary encoder.

FIG. 2 is a view similar to FIG. 1 showing another embodiment. This embodiment is an angle detection system having a structure in which two reflectors 10 and 13 are provided. By using two reflectors 10 and 13, six reflected waves at a distance of 0 m during one rotation are generated. Therefore, since the angle detection can be performed at a plurality of points, the accuracy is improved as compared with the above-described embodiment in which the angle is detected at one point. Although two reflectors 10 and 13 are provided in this embodiment, it goes without saying that three or more reflectors may be provided as long as a plurality of reflectors are provided.

[0009]

As described above, according to the present invention, a reflector is installed in front of a midpoint between a transmitting antenna and a receiving antenna,
Since the rotation angle of the radar is detected based on the reflection intensity,
There is an excellent effect that the rotation angle of the radar can be detected by a simple mechanism without requiring an angle detection device such as a conventional rotary encoder.

[Brief description of the drawings]

FIG. 1 is a configuration diagram showing an embodiment of the present invention.

FIG. 2 is a configuration diagram showing another embodiment.

[Explanation of symbols]

 Reference Signs List 1 transmitting antenna 2 receiving antenna 3 receiving antenna main lobe 4 receiving antenna side lobe (1) 5 receiving antenna side lobe (2) 6 transmitting antenna main lobe 7 transmitting antenna side lobe (1) 8 transmitting antenna side lobe Lobe (2) 9 Radome 10, 13 Reflector for angle detection 11 Center of rotation 12 Radar modem

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁶ , DB name) G01S 7/00-7/42 G01S 13/00-13/95

Claims (1)

(57) [Claims] In a millimeter-wave obstacle detection radar in which a transmitting antenna and a receiving antenna are juxtaposed and these antennas are rotatable by a rotating mechanism, a reflector is fixed in front of an intermediate point between the transmitting antenna and the receiving antenna. Install,
A rotation angle detection method for an obstacle detection radar, wherein the rotation angle of the radar is detected based on the reflection intensity.