JP2593114Y2 - barometer - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a barometer, particularly to a barometer used in a mobile weather observation device.

[0002]

2. Description of the Related Art As a barometer, for example, a barometer using a mercury column is well known, but it is not an apparatus taking into account the altitude (above sea level) of a measuring point. However, the pressure changes due to the altitude difference so that there is an altimeter that uses the change in pressure. Therefore, conventionally, a barometer is installed at a measurement point whose altitude is known in advance, and altitude is corrected by calculation.

[0003]

As described above, the conventional barometer has a problem that it can be used only at a point where the altitude is known in advance. However, for example, when it is desired to accurately measure the central atmospheric pressure of a typhoon, it is convenient if the on-board mobile weather information observation device can be used to actually measure the atmospheric pressure on the typhoon course. Cannot be measured when Further, it cannot be used for meteorological observation in a remote place, further, meteorological observation in the sky using an observation balloon or the like, or pressure measurement as weather prediction in mountain climbing.

The present invention has been made to solve such a problem, and an object of the present invention is to provide a barometer capable of accurately measuring the atmospheric pressure at a location where the altitude of the measurement point is not known.

[0005]

SUMMARY OF THE INVENTION A barometer according to the present invention performs correction using altitude information of a location measured by altitude measuring means using a GPS receiver, so that the barometer can be used regardless of the altitude of the measurement location. Instead, the measurement results at a constant altitude (usually 0 m above sea level) were to be output.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram showing an embodiment of the present invention.
In the drawing, reference numeral 1 denotes an atmospheric pressure sensor, which may be any type of atmospheric pressure sensor, but a sensor capable of outputting a measured value as a numerical value is used. Reference numeral 2 denotes a GPS receiver, which receives radio waves from a plurality of artificial satellites and outputs positioning information and altitude information of the receiving location as is well known, but only the altitude information is used in the present invention. Therefore, the barometer according to the present invention can be incorporated in a navigation device using a GPS receiver, for example. An arithmetic circuit 3 includes an averaging circuit 30 and a correction circuit 31. The averaging circuit 30 is not an essential component as described later.

Next, the operation will be described. Atmospheric pressure sensor 1
Then, the atmospheric pressure is measured ignoring the altitude, and the measurement result is input to the correction circuit 31 of the arithmetic circuit 3. Further, the measurement altitude information of the local point (measurement point) is input from the GPS receiver 2 to the averaging circuit 30 of the arithmetic circuit 3 as needed. The averaging circuit 30 calculates the average value of the measured altitude information according to the averaging constant input from the port 5 and sends the result to the correction circuit 31 as the average altitude information. That is, one measurement altitude obtained by the GPS receiver may include a measurement error, and the averaging circuit 30 converts the error into accurate altitude information until it can be used as altitude information of the barometer. A predetermined average value is obtained.

The correction circuit 31 corrects an altitude difference between the measured atmospheric pressure input from the atmospheric pressure sensor 1 and the average altitude information input from the averaging circuit 30 to obtain an altitude of 0 m (0 m above sea level).
The measured value of the atmospheric pressure in m) is corrected and output from the output port 4. This correction may be performed, for example, by using a correction coefficient (k) table in which the altitude (h) is used as an address. Alternatively, a method of obtaining an approximate value in which the correction coefficient is kept constant, for example, when the pressure rises by 100 m, the pressure of 12 mb decreases. Either of these methods may be used. Further, the measured atmospheric pressure data from the atmospheric pressure sensor 1 may be configured to obtain an average value of a predetermined number of data by an averaging circuit.

[0009]

[Effect of the invention] As described above, the barometer of the invention is as follows.
Correction based on the altitude measured by the GPS receiver can output accurate measurement results that are not affected by the altitude of the measuring point, making it easy and accurate even in places where the altitude of the measuring point is unknown or in mobile weather observation equipment. There is an effect that the measurement of the atmospheric pressure can be performed.

[Brief description of the drawings]

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

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Atmospheric pressure sensor 2 GPS receiver 3 Arithmetic circuit 30 Averaging circuit 31 Correction circuit

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁶ , DB name) G01L 7/00 G01S 5/00 G01W 1/00

Claims (2)

(57) [Scope of request for utility model registration] An altitude (above sea level) information of the measurement point is obtained from the GPS receiver, and measurement data from the atmospheric pressure measuring means is calculated by the arithmetic circuit using the altitude information. A barometer that corrects and outputs barometric pressure measurement data that is not affected by the altitude of the measurement point. 2. An averaging circuit for determining an average value of a plurality of altitude information from altitude information obtained from a GPS receiver, and / or an average value of a plurality of measurement data from measurement data obtained from a barometric pressure measuring means. 2. The barometer according to claim 1, wherein the correction is performed on the basis of these values.