JP2002162478A - Road meteorology detection method and detection system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a road meteorology detection method and a detection system, capable of detecting continuously meteorological quantities along a road. SOLUTION: This method is characterized by installing meteorological sensors 5 on many spots along the road, binding interpolation faces relative to each meteorological quantity, by using the meteorological quantities, measured by the meteorological sensors and wide-area meteorological data around the road, and continuously estimating the meteorological quantities on the road from the interpolation faces.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a road weather detecting method and a detecting system for detecting weather such as wind speed, rainfall, snowfall, temperature, and solar radiation in a road environment.

[0002]

2. Description of the Related Art FIG. 5 shows a conventional road environmental meteorological observation system which has been used so far. In this system, a general weather observation device is installed at a representative point on a road, and measures the weather amount of the road environment. The meteorological observation device is specifically composed of sensors such as a thermometer 1, an anemometer 2 and a rain / snow gauge 3, and a control device 4. For example, in the case of an anemometer, this meteorological observation device is used in places where it is expected that the weather will change in advance and cause troubles such as accidents and traffic jams, such as near the top of a pass or a bridge above a valley. Installed,
Usually installed every 20 to 50 km. The measurement results of these observation devices are transmitted to a central management center using a communication line and provided to road managers and drivers as various road information.

In a conventional measurement system, the weather amount of the road environment can be detected in a place where the weather observation device is installed, but the weather amount cannot be grasped in a place where the weather observation device is not installed. There was a need from drivers to provide road weather continuously even in non-installed locations. That is, there has been a weather information providing system using a road weather observation device so far,
This information has a wide detection range of about 20 km to 50 km. In order for a vehicle to travel safely, it must identify the location of the frozen state and travel over a relatively short range (speed,
There was a problem that operations such as changing the distance between vehicles could not be performed. In addition, AHS (Automated Highwa
y Systems: A driving support road system that enables automatic driving using various support systems and various in-vehicle devices provided on the road side). Road conditions such as dryness, wet / water film, snow cover, freezing, etc., and a road surface slippage coefficient are required continuously. However, this cannot be realized by the conventional system.

[0004]

SUMMARY OF THE INVENTION Accordingly, the present invention has been made to solve the above-mentioned conventional problems and to provide a road weather detection method and a detection system capable of continuously detecting a weather amount along a road. Aim.

[0005]

In order to achieve the above object, according to the first aspect of the present invention, weather sensors are installed at a number of points along a road, and a weather amount measured by the weather sensors and a weather amount around the road are measured. This is a road weather detection method characterized by obtaining an interpolation plane for each weather quantity using wide area weather data and continuously estimating the weather quantity on the road from the interpolation plane. As a result, road weather can be continuously detected at low cost and with high accuracy.

According to a second aspect of the present invention, there are provided weather sensors installed at a number of points along a road, a wide-area weather data receiving apparatus for receiving a wide-area weather amount around the road, and reception from the wide-area weather data receiving apparatus. A road weather detection system comprising a data processing device that takes in data and measurement data from a weather sensor and performs interpolation calculation.

[0007]

An embodiment of the present invention will be described with reference to the drawings. FIG. 1 is an overall configuration diagram of the road weather detection system. The present system is provided with various weather sensors 5 such as a thermometer, a wind direction and anemometer, and a rain / snow gauge, a transmission device 6 for transmitting data measured by the weather sensors to a central monitoring station, and installed in the central monitoring station. It comprises a data processing device 7 and a wide area weather data receiving device 8. In this system, the weather sensors 5 are juxtaposed along a long-distance road. The juxtaposed interval is a distance corresponding to the length at which the road weather changes.
They are arranged at intervals of up to 4 km.

[0008] These received data and measured data are:
The data is taken into the data processing device 7 in the central monitoring station, and interpolation calculation is performed as needed. A specific example of this calculation is shown below. That is, for example, the distribution of the measured temperature (temporarily set to Z) at each location on FIG. 2 (temporarily sets the latitude to X and the longitude to Y) in FIG. It can be assumed, and if this is displayed spatially (three-dimensionally), it can be displayed as a smooth curved surface.

In general, a fifth-order polynomial function that connects Z given to points arranged irregularly on an XY plane on a smooth surface can be expressed as follows.

[0010]

(Equation 1) The interpolation surface is obtained by determining the variables of the above-mentioned approximate surface expression from the various wide-area weather data and the weather sensor measurement values.

FIG. 3 shows an example in which a main interpolation surface is obtained. This example is an example of a temperature distribution at a certain date and time, but has a curved surface that is smoothly connected spatially. Based on this result, at a place on the road where the weather sensor 5 is not installed, the weather quantity is obtained by substituting the position information (latitude X, longitude Y) into the obtained interpolated surface equation.

FIG. 4 shows the result. FIG.
Is the result of interpolation using the wide area weather data and the measurement values of the weather sensors 5 installed at intervals of about 4 km near the road. The temperature is accurately detected even in places where the weather sensors 5 are not installed. You can see that it is.

In this embodiment, the temperature is shown in the weather quantity.
Similarly, the amount of rainfall and snowfall is determined. The wind speed may have some error in the interpolated value due to the influence of the surrounding environment, but can be accurately reproduced by adding a correction process due to the influence of the surrounding shield.

[0014]

According to the first and second aspects of the present invention, the following effects can be expected. Road weather can be detected continuously and with high accuracy while increasing the installation interval of weather sensors installed near the road. The above can be constructed as a relatively inexpensive system. By incorporating prediction information as wide-area weather data, prediction information such as precipitation and snowfall a few hours ahead can be obtained as along the road in the same manner as described above. Based on this information, it is possible to increase the efficiency of road management such as arranging an optimal number of snow plows in necessary places. Based on this information, for example, for the driver,
Freezing points can be provided in more detail, increasing safety.

[Brief description of the drawings]

FIG. 1 is an overall configuration diagram of a road weather detection system according to an embodiment of the present invention.

FIG. 2 is a diagram showing an example of wide-area meteorological observation data.

FIG. 3 is a drawing showing an interpolation result (1) (an example of air temperature) of a weather quantity.

FIG. 4 is a drawing showing an interpolation result (2) (an example of air temperature) of a weather quantity.

FIG. 5 is a drawing showing a conventional road environment weather observation system.

[Explanation of symbols]

 Reference Signs List 5 weather sensor 6 transmission device 7 data processing device 8 wide area weather data receiving device

Claims (2)

[Claims] 1. A weather sensor is installed at many points along a road, and an interpolation plane for each weather amount is obtained by using weather amounts measured by the weather sensors and wide-area weather data around the road. A road weather detection method characterized by continuously estimating a weather amount on a road from a surface. 2. A weather sensor installed at a number of points along a road, a wide-area weather data receiving device for receiving a wide-area weather amount around the road, data received from the wide-area weather data receiving device, and the weather sensor. And a data processing device for taking in measurement data from the vehicle and performing interpolation calculation.