JPH04132993A - Information device of rain fall - Google Patents

Abstract

PURPOSE:To obtain automatically information regarding rain fall with out requiring any special apparatus by detecting received intensity of an electric wave from a stationary satellite so as to obtain the informations regarding the rain fall. CONSTITUTION:A receiver 10 is equipped with a parabolic antenna 11 and a frequency converter 12, and output of the converter 12 is fed to a radiofrequency wattmeter 13 equipped with a bolometer. When the sky is clear, a value of received electric power measured by the wattmeter 13 is stored to a memory 22, as a standard value. At rain fall, an electric wave from a broadcasting satellite 1 reduces according to the precipitation amount. The received electric power, which reduces during the rain fall, is measured by the wattmeter 13 and compared to the standard value stored in the memory 22, by a comparison measures 21, to obtain the decrement amount caused by the rain fall. A calculation measures 23 of precipitation calculates intensity of rain fall and an accumulated precipitation, based on a decrement amount by rain fall obtained by the measures 21 and referring to a conversion table stored in a ROM 24.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] This invention relates to a rainfall information device that uses radio waves from satellite broadcasting.

[Summary of the Invention] The present invention detects the reception strength of radio waves from a geostationary satellite to automatically measure the amount of rainfall that has a predetermined relationship with this reception strength, thereby providing information on rainfall without the need for special equipment. First, it is automatically obtained.

[Prior Art] Conventionally, the amount of rainfall has been measured by humans using a rain gauge to measure the actual amount of rainfall every unit time. Or, for example, rainfall 1
A telemeter rain gauge with a tipping basin that generates a pulse by tipping over once every millimeter was used to calculate the total amount within the observation station via a wireless link.

[Problems to be Solved by the Invention] In the conventional rainfall measurement method described above, the amount of rainfall per unit time can be measured, but there is a problem in that it is difficult to measure the amount of rainfall instantaneously (rain intensity). Ta.

Another problem is that automatic measurement requires a special rainfall gauge, such as a tipping basin type.

In view of this, an object of the present invention is to provide a rainfall information device that can automatically obtain information regarding rainfall without requiring special equipment.

[Means for Solving the Problems] The present invention is a descent information device that detects the reception strength of radio waves from a geostationary satellite to obtain information regarding rainfall.

[Operations] According to the present invention, information regarding rainfall can be automatically obtained without the need for special equipment.

[Embodiment] Hereinafter, an embodiment of the rainfall information device according to the present invention will be described with reference to FIGS. 1 and 2.

FIG. 1 shows the configuration of an embodiment of this invention.

In Figure 1, (1) is a broadcasting satellite located in a geostationary orbit 36,000 km above the equator, and transmits S in the 12 GHz band.
It is transmitting HF radio waves.

The receiving device (10) includes a parabolic antenna (11) and a
It is equipped with a frequency converter (12) that converts broadcast radio waves in the 2GHz band to the IGHz band, and the output of the frequency converter (12) is
For example, it is supplied to a high frequency power meter (13) using a bolometer.

(20) is a computer, which includes a memory (21) for storing a reference value of received power, a means (22) for comparing the reference value and the measured value, and a rainfall amount based on the output of the comparing means (22). It is provided with a rainfall calculation means (23) for calculating the amount of rainfall.

(24) is a ROM table.

Next, the operation of an embodiment of the present invention will be described with reference to FIG.

Since the radio waves from the broadcasting satellite (1) have a high frequency of 12 GHz, it is known that they are attenuated by rain, as shown in FIG.

This invention focuses on the fact that the amount of attenuation due to rain is almost proportional to the amount of rainfall, and attempts to automatically obtain information regarding rainfall, such as automatic measurement of rainfall amount.

In this embodiment, the received power value measured by the wattmeter (13) on a clear day is used as the reference value, and the memory (21
).

When it rains, the radio waves from the broadcasting satellite (1) are attenuated according to the amount of rain, and the received power is reduced.

The received power during rain is measured by a power meter (13), and the comparison means (22) stores this measured value and the memory (21).
The amount of attenuation due to rain is determined by comparing with the reference value stored in .

In the rainfall calculation means (23), the comparison means (22)
Based on the amount of rainfall attenuation obtained in step 1, rain intensity and cumulative rainfall amount are calculated by referring to a conversion table similar to that shown in FIG. 2, which is stored in the ROM (24).

As mentioned above, in this embodiment, the reception strength of radio waves from a geostationary satellite is detected, so commercially available antennas and converters can be used, and a common observation system throughout Japan can be easily configured. be able to.

In addition, in the above-mentioned embodiment, the frequency converter provides 12GH
Although the received power is measured by converting the broadcast radio waves in the z band to the IGHz band, the received power of the broadcast radio waves in the 12 GHz band may be directly measured.

Further, in the case of rough measurement, a so-called high frequency level meter may be used to measure the reception strength of broadcast waves in the 12 GHz band.

Furthermore, in the above embodiment, the amount of rainfall is calculated based on the amount of rainfall attenuation of broadcast radio waves in the 12 GHz band. You can also do it.

[Effects of the Invention] As detailed above, according to the present invention, since the reception strength of radio waves from a geostationary satellite is detected, it is possible to automatically measure the amount of rainfall in a predetermined relationship with this reception strength, etc. A rainfall information device can be obtained that can automatically obtain information regarding rainfall without requiring special equipment.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing the configuration of an embodiment of a rainfall information device according to the present invention, and FIG. 2 is a diagram for explaining the present invention. (1) is a broadcasting satellite, (10) is a receiving device, (13) is a high frequency power meter, (20) is a computer, (24) is an RO
This is an M table.

Claims (1)

[Claims] A rainfall information device that obtains information regarding rainfall by detecting the reception strength of radio waves from a geostationary satellite.