JP3735663B2 - Road surface condition grasping system - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a road surface condition grasping system that provides road surface condition information to a vehicle traveling on a road, and more particularly to an improvement of a radio wave radiometer type road surface condition grasping system that receives radio wave radiation energy and grasps a road surface condition.
[0002]
[Prior art]
An example of a conventional radio radiometer-type road surface condition grasping system (hereinafter referred to as “radio radiometer”) is a collection of lectures at the 1999 IEICE General Conference held at Keio University in March 1999. It is shown in a paper entitled “Understanding Road Surface Conditions Using a Radio Radiometer” published on page 353 of “Information / System 1”. FIG. 4 shows a radio radiometer that has been published in this collection of lectures. That is, the radio wave radiometer includes a radio wave radiation receiving unit 1 including an antenna unit 2, a high frequency receiving unit 3, an intermediate frequency / A / D unit 4, and data for performing data processing of signals output from the radio wave radiation receiving unit 1. The processing unit 5 is configured. The antenna unit 2 includes a sky, a dielectric lens 12 that collects a radiation beam radiated from the road surface, and a reception horn 13 for taking the collected radiation beam into the high-frequency receiving unit 3. With this radio wave radiometer, the measurement form as shown in FIG. 5, that is, the radio wave radiation receiving unit 1 is installed on the pole 7 together with the turntable 6, and the road surface information is detected by receiving the radiation energy radiated from the road surface 8. I do. The processing of the reception signal from the radio wave radiation receiving unit 1 is performed by the data processing unit 5 that is placed immediately below the pole 7. The road surface information of each place on the road surface 8 is received as road surface radiation beams 9a and 9b. That is, in this prior art, in order to acquire road surface information at each location on the road surface 8, it is necessary to rotate the radio wave radiation receiving unit 1 with the turntable 6 so that the required number of measurement locations can be obtained.
[0003]
In addition, in the radio wave radiometer described in the above-mentioned lecture paper collection, it is necessary to measure the sky radiation energy in addition to the road surface information. This sky radiant energy is the depression angle (incident angle with respect to the road surface) where the radio wave radiation receiving unit 1 is turned upside down from the road surface radiant energy measurement angle and rotated by the turntable 6 so as to be the sky radiant energy measurement angle. The sky information of the same number as the road surface measurement points is measured for the elevation angle corresponding to FIG. 6 shows a measurement form in the case of sky radiation energy measurement. That is, the radio wave radiation receiving unit 1 is installed on the pole 7 together with the turntable 6, and the sky information is detected by receiving the radiant energy radiated from the road surface 8. The processing of the reception signal from the radio wave radiation receiving unit 1 is performed by the data processing unit 5 that is placed immediately below the pole 7. Sky information corresponding to each field on the road surface 8 is received as sky radiation beams 10a and 10b. That is, in order to acquire sky information at each place in the sky, it is necessary to rotate the radio wave radiation receiving unit 1 with the turntable 6 so that a necessary number of measurement points can be obtained.
[0004]
[Problems to be solved by the invention]
However, the conventional road surface condition grasping system described above has the following problems. That is, the first problem is that a radio wave radiation receiving unit is mounted on a turntable and rotated with high accuracy in order to measure a plurality of information on road surface conditions finely. For that purpose, a highly accurate turntable was required. Further, the second problem is that the radio wave radiation receiving unit is directed downward for measuring road surface information and directed upward for measuring sky information in order to measure sky information after measurement of road surface information. And the turntable for that purpose has been shared with the above-mentioned high-precision turntable, but the accuracy of the turntable is not necessary, but there is a problem that some turntable is required to install on the pole There is. As described in the 1999 IEICE General Conference Proceedings, where the above-mentioned prior art is published, it is essential to acquire road surface emissivity in order to realize road surface state identification. This is because it is necessary to measure road surface radiant energy and sky radiant energy. As described above, the conventional radioradiometer has been provided with a rotating table to perform two-dimensional scanning in order to measure a plurality of road surface conditions. However, a radioradiometer is actually installed on a roadside column. Since it is unsuitable for practical use to perform the dimension scanning, it is desired to realize a road surface condition grasping system that does not use such a turntable.
[0005]
The object of the present invention is equivalent to the measurement of road surface information at a plurality of points on the road surface and the elevation angle at the time of measuring the road surface information at the plurality of points, without using a high-precision turntable, which was used in a conventional road surface condition grasping system. An object of the present invention is to provide a road surface condition grasping system that enables measurement of a plurality of sky information at depression angles.
[0006]
[Means for Solving the Problems]
In order to achieve the object as described above, the road surface condition grasping system includes a road surface, an aerial unit that receives a radiation beam radiated from the sky, a high-frequency receiving unit, and an intermediate frequency / A / D conversion unit. And a data processing unit that receives a signal output from the radio wave radiation receiving unit and performs data processing on the road surface condition grasping system, wherein the antenna unit emits radiation emitted from the road surface and the sky. A dielectric lens for condensing the beam; a receiving horn for receiving the radiation beam collected by the dielectric lens and taking it into the high-frequency receiving unit; and a radiation beam for the dielectric lens and the receiving horn on the road surface and in the sky. is composed of a aerial movable portion for moving the corresponding positions, different angles to the incident radiation beam positioning is moved to the position corresponding to the angle at the antenna moving unit And it is characterized in that which is so received by a dielectric lens and a receiving horn is.
Therefore, it is possible to measure road surface information at a plurality of points and to measure sky information at a plurality of points corresponding thereto without rotating the radio wave radiation receiving unit. Therefore, it is possible to obtain an effect that a highly accurate turntable is not required.
[0007]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described in detail with reference to FIGS.
FIG. 1 shows a basic configuration in the first embodiment of the present invention. In FIG. 1, a radio wave radiation receiving unit 11 comprising an antenna unit 2, a high frequency receiving unit 3, an intermediate frequency / A / D unit 4, and a data processing unit 5 that performs data processing of signals output from the radio wave radiation receiving unit 11. It is configured. In the present invention shown in FIG. 1, the antenna unit 2 is composed of a dielectric lens 12, a receiving horn 13, and an antenna moving unit 14, unlike the conventional system.
[0008]
FIG. 2 shows details of the aerial part 2 shown in FIG. That is, in FIG. 2, the radiation beams incident at different angles are received by the dielectric lens and the receiving horn 13 positioned by the antenna movable unit 14 at the corresponding positions. This is because beams emitted from different road surfaces are incident on the dielectric lens at different angles, and beams emitted from the sky are also incident on the dielectric lens at different angles, but the beams incident at these different angles. Means that the signal is received by the dielectric lens and the receiving horn positioned by the antenna movable portion at the corresponding position. Specifically, in FIG. 2, the dielectric lens moves on the rotation locus 15 with the radius R by the antenna moving part 14 (FIG. 1). Here, the radius R is the focal length of the dielectric lens. In the figure, when the radiation beam 21a is incident on the dielectric lens 12a, the radiation beam 21a is converged and taken into the receiving horn 13a. Dielectric lens 12 b by aerial movable portion 14 relative to the radiation beam 21b incident from different directions in the same manner, the receiving horn 13b is moved, is taken into the receiving horn 13b is further converged. Similarly, the dielectric lens 12c and the receiving horn 13c are moved by the antenna moving part 14 and the dielectric lens 12c and the receiving horn 13c are moved to the radiation beam 21c incident from different directions, respectively. To do. As described above, it is possible to detect radiation beams from different angles by moving the dielectric lens and the reception horn using the antenna movable unit 14 as described above.
[0009]
FIG. 3 shows a measurement form of the road surface condition grasping system using such an antenna unit 2. In FIG. 3, the radio wave radiation receiving unit 11 is installed on the pole 7, and road surface information and sky information are detected by receiving radiant energy radiated from the road surface 8. The processing of the received signal from the radio wave radiation receiving unit 11 is performed by the data processing unit 5 that is placed immediately below the pole 7. The road surface information of each place on the road surface 8 is received as road surface radiation beams 9a and 9b. Further, information on each point in the sky is received as sky radiation beams 10a and 10b. In this case, the road surface information at each location on the road surface can be measured as described in FIG. 2 without using a turntable. As described above, in this embodiment, the use of the dielectric lens and the array antenna has an effect that the road surface information measurement and the sky information measurement can be performed without rotating the radio wave radiation receiving unit with high accuracy.
[0010]
【The invention's effect】
As described above, the road surface condition grasping system of the present invention has the following effects. That is, in the case of the present invention, since the antenna moving part is provided in the antenna part of the radio wave radiation receiving part and the dielectric lens and the receiving horn are made movable, the radio wave radiation receiving part is used for road surface information measurement and sky information measurement. There is an effect that it can be carried out without rotation.
[Brief description of the drawings]
FIG. 1 is a diagram showing a configuration of a road surface condition grasping system according to an embodiment of the present invention.
FIG. 2 is a diagram showing an operation principle of the dielectric lens and the array antenna.
FIG. 3 is a diagram showing a measurement form of road surface information and sky information measurement in the road surface condition grasping system.
FIG. 4 is a diagram showing a configuration of a conventional road surface condition grasping system.
FIG. 5 is a diagram showing a measurement form of road surface information measurement in the road surface condition grasping system.
FIG. 6 is a diagram showing a measurement form of sky information measurement in the road surface condition grasping system.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1,11 Radio wave receiving part 2 Aerial part 3 High frequency receiving part 4 Intermediate frequency and A / D part 5 Data processing part 6 Turntable 7 Pole 8 Road surface 9a, 9b Road surface radiation beam
10a, 10b Sky radiation beam
12a-d Dielectric lens
13a-d Receiving horn
14 Aerial moving parts
21a-d Radiation beam

Claims (1)

A radio wave radiation receiver (11) comprising a road surface, an aerial section (2) for receiving a radiation beam radiated from the sky, a high frequency receiver (3) , an intermediate frequency / A / D converter (4 ), and the radio wave radiation In a road surface condition grasping system including a data processing unit (5) that receives a signal output from a receiving unit and performs data processing,
The antenna part (2) receives the radiation lens condensed by the dielectric lens (12) and the dielectric lens (12) for condensing the radiation beam radiated from the road surface and the sky, and receives the high frequency signal. A receiving horn (13 ) to be taken into the unit (3) , and an antenna moving part (14) for moving the dielectric lens (12) and the receiving horn (13) to a radiation beam corresponding position on the road surface and the sky. The radiation beam incident at different angles is received by the dielectric lens (12) and the receiving horn (13) which are moved and positioned by the antenna moving part (14) to a position corresponding to the angle. Road surface condition grasping system characterized by being.

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