JP3448643B2 - Road surface grasp system - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a road surface condition grasping system for providing a road surface condition to a vehicle traveling on a road, and more particularly to an improvement of a radio wave radiometer which receives radio wave radiation energy and grasps a road surface condition. It is a thing.

[0002]

2. Description of the Related Art As an example of a conventional road surface condition grasping system, it was held at Keio University in March 1999.
Proceedings of the 1999 IEICE General Conference
System 1 ”Article No. SID- on page 353
Some are disclosed in 1-3 “Understanding the road surface condition with radio radiometers”. It is as shown in FIGS. 9 to 11, and this radioradiometer includes a radiowave radiation receiver 1 having an antenna 2, a high frequency receiver 3, and an intermediate frequency / AD unit 4, and The data processing unit 5 for processing the signal data output from the receiving unit 1 and the turntable 6 for rotating the radio wave radiation receiving unit 1 are provided.

In such a radioradiometer, as shown in FIG. 10, a radio wave radiation receiver 1 is installed on a pole 7 together with a turntable 6 to receive radiant energy radiated from a road surface 8 to obtain road surface information. Is being detected. The processing of the received signal from the radio wave radiation receiving unit 1 is performed by the data processing unit 5 placed immediately below the pole 7 and adjacent thereto.
The road surface information of each place on the road surface 8 includes road surface radiation beams 9-1,
It is received as 9-2. Therefore, in order to obtain road surface information at each place on the road surface, it is necessary to rotate the radio wave radiation receiving unit 1 on the turntable 6 so that the required measurement place can be obtained.

In the radio radiometer of the above-mentioned lecture collection, it is necessary to measure the sky radiation energy in addition to the road surface information. This sky radiant energy is such that the radio wave radiation receiving unit 1 is turned upside down from the road surface radiant energy measurement angle, and is rotated by the turntable 6 so as to be at the sky radiant energy measurement angle. For the elevation angle corresponding to the incident angle), the sky information is measured with the same number of road surface measurement points.

FIG. 11 shows a measurement state in the case of sky radiant energy measurement. That is, the radio wave radiation receiver 1 is installed on the pole 7 together with the turntable 6, and the radiant energy radiated from the road surface 8 is received to detect sky information. The processing of the received signal from the radio wave radiation receiving unit 1 is performed by the data processing unit 5 placed immediately below the pole 7 so that the sky information corresponding to each field on the road surface 8 is the sky radiation beam 10-.
It is received as 1, 10-2. That is, in order to obtain the sky information at each place in the sky, it is necessary to rotate the radio wave radiation receiving unit 1 on the turntable 6 so that the required number of measurement points can be obtained.

[0006]

The road surface condition grasping system as described above has the following problems. The first problem is that the radio wave radiation receiver is mounted on the turntable in order to measure the road surface condition information at multiple points in detail.
It has to be rotated with high precision, which requires a high-precision turntable.

The second problem is that the radio wave radiation receiver is moved to measure the sky information after the road information is measured. Conventionally, the rotary table for that purpose also serves as the above-mentioned high-precision rotary table, but although it is not as accurate as such a rotary table, some type of rotary table is necessary for installation on the pole. This is because, as described in the proceedings of the 1999 IEICE General Conference, which discloses the prior art, it is essential to acquire the road surface emissivity in order to realize road surface state identification. This is because it is necessary to measure road surface energy and sky radiation energy.

Therefore, an object of the present invention is to solve the problems in the conventional road surface condition grasping system as described above, to measure road surface information at a plurality of points on a road surface without using a high-accuracy turntable, and to measure a plurality of points. In the depression angle corresponding to the elevation angle when measuring the road surface information, there is to provide a road surface condition grasping system capable of measuring a plurality of sky information, and yet another object of the present invention is to use a rotary table, An object is to provide a road surface condition grasping system capable of measuring road surface information and sky information.

[0009]

SUMMARY OF THE INVENTION In order to achieve the above-mentioned object in a road surface condition grasping system, the present invention according to claim 1 receives radiant energy from the road surface and the sky. Data processing by receiving the signals output from the radio wave radiation receiving section having the antenna section, high frequency receiving section, intermediate frequency and AD return section, the turntable for rotating the radio wave radiation receiving section, and the radio wave radiation receiving section. the road surface status monitoring system comprising data processing unit which performs and is characterized by being configured by a multi-antenna having one of the dielectric lens, and at least two or more antennas aerial part.

According to a second aspect of the present invention, there is provided a radio wave radiation receiving section having an antenna section for receiving radiant energy from a road surface and the sky, a high frequency receiving section, an intermediate frequency / AD returning section, and a radio wave radiation receiving section. receiving a signal output, the road status monitoring system comprising a data processing unit for processing data, constituted by a multi-antenna having one of the dielectric lens, and at least two or more antennas antenna unit, Further, a radio wave reflector is provided on the front surface of the radio wave radiation receiver so as to be parallel or perpendicular to the road surface.

[0011]

BEST MODE FOR CARRYING OUT THE INVENTION In the embodiments of the present invention shown in the drawings, the same parts as those of the conventional example are designated by the same reference numerals, and the description thereof will be omitted. 1 to 4 show a first embodiment of the present invention. In this embodiment, a radio wave radiation receiving section 1 having an antenna section 2, a high frequency receiving section 3 and an intermediate frequency / AD section 4, It is provided with a data processing section 5 for performing data processing of the signal output from the radio wave radiation receiving section 1, and a turntable 6 for rotating the radio wave radiation receiving section 1. The antenna part 2 is different in system from the conventional one, and as shown in FIG.
It has 12 and multi-antenna 13.

In such an arrangement, the details of the antenna section 2 are shown in FIG. 2, and the radiation beams incident on the dielectric lens 12 at different angles are received by different antennas. This means that beams emitted from different road surfaces enter the dielectric lens 12 at different angles, and beams emitted from the sky also enter the dielectric lens 12.

Specifically, the radiation beam 21 that is incident on the dielectric lens 12 substantially perpendicularly is received by the antenna 25, while the radiation beams 22 and 23 that are incident slightly obliquely are received by the antennas 26 and 27, respectively. It That is, antennas 25, 26, 27
By using the array antenna composed of and the dielectric lens 12, it becomes possible to instantaneously detect radiation beams from different angles.

The measurement state of the embodiment using such an antenna portion 2 is shown in FIGS. In FIG. 3, the radio wave radiation reception unit 11 is installed on the pole 7 and the radiation energy radiated from the road surface 8 is received to detect the road surface information. The processing of the reception signal from the radio wave radiation reception unit 11 is performed by the data processing unit 5 arranged immediately below the pole 7 and adjacent thereto.

Road surface information at each location on the road surface 8 is received as a road surface radiation beam 9. In this case, the road surface information at each place on the road surface can be measured in a state as shown in FIG. 3 without using a turntable. On the other hand, the radiation beam in the sky is measured in the state shown in FIG. That is, the radio wave radiation receiving unit 11 is installed on the pole 7 and the radiant energy radiated from the sky is received to detect the sky information. The processing of the reception signal from the radio wave radiation reception unit 11 is performed by the data processing unit 5 arranged immediately below the pole 7 and adjacent thereto.

Information about each point in the sky is received as a sky radiation beam 10. In this case, the sky information at each point in the sky can be measured in a state as shown in FIG. 2 without using a turntable. The turntable 6 in FIGS. 3 and 4 is for rotating the radio wave radiation receiving unit 11 from road surface information measurement to sky information measurement, and does not require the turntable to have higher accuracy than the conventional method. is there. As described above, in this embodiment,
By using the dielectric lens and the array antenna, it is possible to measure road surface information and sky information without rotating the radio wave radiation receiver 11 with high accuracy.

FIGS. 5 to 8 show a second embodiment of the present invention. This embodiment has the same basic structure as that of the first embodiment, but the radio wave radiation receiver has a structure similar to that of the first embodiment. The difference is that a radio wave reflector is provided on the front surface. That is, as shown in FIG. 5, the radio wave radiation receiver 11 including the antenna 2 having the dielectric lens 12 and the multi-antenna 13 performs road surface information measurement and sky information measurement without being mounted on the turntable. ing. That is, as shown in FIG. 6, the radio wave radiation receiving unit 11 is fixed to a fixed base fixed to the pole 7, and when measuring road surface information, the radio wave reflecting plate driving unit 17
The radio wave reflection plate 16 is set in a state perpendicular to the road surface. As a result, the road surface radiation beam 9 radiated from the road surface is received by the radio wave radiation receiving unit 11 having the dielectric lens 12, as shown in FIG. 6, and the road surface information can be measured.

On the other hand, when measuring the sky information, as shown in FIG.
Keep 16 horizontal to the road. Here, the sky radiation beam 10 emitted from the sky is reflected by the radio wave reflection plate 16 and is received by the radio wave radiation receiving unit 11 having the dielectric lens 12, and the sky information can be measured.

The radio wave reflection plate 16 in this embodiment may be a metal plate, a dielectric plate or the like, but an aluminum plate is simple and easy to use. FIG. 8 shows the result of measurement of an aluminum plate placed on the road surface using the road surface condition comprehension system composed of radio wave radiometers disclosed in the Proceedings of the 1999 IEICE General Conference mentioned above as the prior art. Is shown in. In this drawing, the horizontal axis represents the angle of incidence of radiant energy from the road surface and the sky on the radio wave radiation receiver, and the vertical axis represents the measured radiation temperature at that time. And each measurement is made about the vertically polarized wave and the horizontally polarized wave.

From FIG. 8, in the case of the normal road surface information measurement, the road surface radiation temperature is about 280 degrees in vertical polarization and 2 in horizontal polarization.
It can be seen that the temperature is around 60 degrees, while the vertical radiation and horizontal polarization are around 140 degrees at the sky radiation temperature. However, when an aluminum plate written as using an aluminum reflector was placed on the road surface, the road surface radiation temperature became almost equal to the sky radiation temperature. From such experimental results, it was found that the aluminum plate is the optimum radio wave reflection plate.

[0021]

As described above, the present invention is as described above.
The invention described in 1. is an antenna for receiving radiant energy from a road surface and the sky, a high frequency receiver, an intermediate frequency / AD.
In a road surface condition grasping system including a radio wave radiation receiving unit having a return unit, a turntable for rotating the radio wave radiation receiving unit, and a data processing unit that receives a signal output from the radio wave radiation receiving unit and processes the data. , since it is configured by a multi-antenna having one <br/> dielectric lens, and at least two or more antennas antenna unit, a radio wave arriving at different angles, can correspond to the respective angles, for which Without rotating the radio wave radiation receiver
It is possible to measure road surface information at a plurality of points and sky information at a plurality of points corresponding to the road surface information, and it is possible to eliminate the need for highly accurate rotation.

According to a second aspect of the present invention, there is provided a radio wave radiation receiving section having an antenna section for receiving radiant energy from the road surface and the sky, a high frequency receiving section, an intermediate frequency / AD returning section, and a radio wave radiation receiving section. receiving a signal output, the road status monitoring system comprising a data processing unit for processing data, constituted by a multi-antenna having one of the dielectric lens, and at least two or more antennas antenna unit, Furthermore, since the radio wave reflector is installed in front of the radio wave radiation receiver so as to be parallel or perpendicular to the road surface, radio waves arriving at different angles can be received by the antennas corresponding to the respective angles. Enables measurement of road surface information at multiple points and corresponding sky information at multiple points without rotating the radio wave radiation receiver. It becomes parallel to, or perpendicular to the road surface
By providing a locatable radio wave reflecting plate cormorants, has the effect of allowing, without installing a turntable and a road surface information measurement and sky information measurement.

[Brief description of drawings]

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

FIG. 2 is a diagram showing the operating principle of the above dielectric lens and array antenna.

FIG. 3 is a measurement explanatory diagram when measuring road surface information of the above.

FIG. 4 is a measurement explanatory diagram when measuring sky information in the above.

FIG. 5 is a configuration diagram of a second embodiment of the present invention.

FIG. 6 is a measurement explanatory view when measuring road surface information of the above.

FIG. 7 is a measurement explanatory diagram when measuring sky information in the above.

FIG. 8 is a characteristic diagram of the aluminum radio wave reflection plate of the above.

FIG. 9 is a configuration diagram of a conventional road surface condition ascertaining system of the same type as the present invention.

FIG. 10 is a measurement explanatory diagram when measuring road surface information of the above.

[Fig. 11] Fig. 11 is a measurement explanatory diagram when measuring sky information in the same as above.

[Explanation of symbols]

1 Radio wave radiation receiver 2 Antenna 3 High frequency receiver 4 Intermediate frequency / AD
Part 5 Data processing part 6 Rotating table 7 Pole 8 Road surface 9 Road surface radiation beam 10 Sky radiation beam 11 Radio wave radiation reception part 12 Dielectric lens 13 Multi-antenna 16 Radio wave reflection plate 17 Radio wave reflection plate drive part 21 Radiation beam 22 Radiation beam 23 Radiation beam Beam 25 Antenna 26 Antenna 27 Antenna

─────────────────────────────────────────────────── ─── Continuation of the front page (56) Reference JP 2000-74655 (JP, A) JP 10-20037 (JP, A) JP 62-173442 (JP, A) JP 5-302968 (JP, A) JP 62-189443 (JP, A) JP 61-102508 (JP, A) JP 11-231052 (JP, A) (58) Fields investigated (Int. Cl. ⁷⁾ , DB name) G08G 1/00 G01S 13/88

Claims (2)

(57) [Claims] 1. A radio wave radiation receiving section having an antenna section for receiving radiant energy from a road surface and the sky, a high frequency receiving section, an intermediate frequency / AD returning section, and a turntable for rotating the radio wave radiation receiving section. In a road surface condition ascertaining system including a data processing unit that receives a signal output from a radio wave radiation receiving unit and performs data processing, the antenna unit includes one induction lens and at least two or more antennas. A road surface condition grasping system characterized by being configured by a multi-antenna having a. 2. A radio wave radiation receiving section having an antenna section for receiving radiant energy from the road surface and the sky, a high frequency receiving section, an intermediate frequency / AD returning section, and a signal output from the radio wave radiation receiving section. Te, in road status monitoring system comprising a data processing unit for performing data processing, the antenna unit is constituted by one of the dielectric lens and the multi-antenna having at least two or more antennas, further the front surface of the radio emission receiver A road surface condition grasping system, characterized in that a radio wave reflection plate is provided so as to be parallel or perpendicular to the road surface.