JPH01196588A - Distance measuring apparatus - Google Patents

Abstract

PURPOSE:To measure a distance even in a narrow place, by measuring the elevation of an arriving direct wave and that of a reflected wave and calculating the distance up to a transmission source on the basis of said elevations and the height data inputted from the outside. CONSTITUTION:In a direct wave measuring means 11, the elevation thetaH of the direct arrival wave S1 from a radio wave transmission source P0 is measured at a predetermined height position H. In a reflected wave measuring means 2, the elevation thetaL of the reflected arrival wave S2 arriving by the reflection from the ground of the radio wave from the same transmission source P0 is measured at the same position as the aforementioned direct wave measuring means 1. On the basis of the elevation data thetah, thetal measured by the measuring means 1, 2 and the height data (h) at a measuring position, the distances W0, W1 from a measuring reference point A0 to the radio wave transmission source P0 are calculated. When this measuring apparatus is used, it becomes unneces sary to separate two measuring means by a predetermined distance at a measur ing point as conventional and a distance can be measured even in a narrow place.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a distance measuring device, and more particularly, to a distance measuring device for detecting a source of incoming radio waves and measuring the distance thereof.

[Conventional technology]

Conventionally, this type of distance measuring device uses a radio wave source P as shown in FIG. 3, for example. The azimuth angle of the direct wave arriving from the receiving side is measured by two azimuth measuring devices 10A and IOB located at a distance R apart from each other, and their angle θ1. θ
2 and the distance R between the two points.

[Problem to be solved by the invention]

However, in the above conventional example, the direction of the incoming radio waves is measured at a point a predetermined distance R away, so if the installation location is narrow, it is not possible to take a sufficient distance, and therefore the direction is This has caused an inconvenience in that it interferes with measurement and distance measurement to the radio wave source.

[Object of the Invention] The object of the present invention is to improve the disadvantages of the conventional example, and to provide a distance capable of effectively measuring the distance to the source of incoming radio waves even if the measurement point is in a narrow place. The purpose of this invention is to provide a measuring device.

(Means for Solving the Problems) The present invention includes a direct wave measuring means that measures the elevation angle of a directly arriving wave from a radio wave source at a predetermined height position, and a direct wave measuring means that measures the elevation angle of a directly arriving wave from a radio wave source at a predetermined height position. reflected wave measuring means for measuring the elevation angle of the reflected arriving wave arriving at the same position as the direct wave measuring means.Furthermore, the elevation angle information measured by each measuring means and the preset measurement position are provided. The configuration is such that a calculation circuit is provided for calculating the distance to the radio wave source based on the height information of the radio wave source.This is intended to achieve the above-mentioned purpose.

[Embodiments of the invention]

An embodiment of the present invention will be described below with reference to FIGS. 1 and 2.

The embodiment shown in FIGS. 1 and 2 includes a direct wave measuring means 1 that measures the elevation angle θ□ of a directly arriving wave S1 from a radio wave source P0 at a predetermined height position H, and The elevation angle θ1 of the reflected incoming wave S2 that arrives after the radio wave is reflected on the ground
It is equipped with a reflected wave measuring means 2 which measures at the same position as the direct wave measuring means 1 described above. Each of these measuring means 1,
2, the elevation angle information θ1. Calculating means 3 is provided for calculating the distances W0 and Wl from the measurement reference point A0 to the radio wave source P0 based on θ and the height information of the measurement position. Here, one distance W. indicates the spatial straight line distance to the radio wave source P0. Further, the other distance WI indicates the distance to the ground position vertically below the radio wave transmission source P0. That is, w,=r(θ8.θ2)...■W,=
cos θs·r(θ4.θ2)...■ is calculated by the calculation means 3 using the height H to the measurement reference point A0 as a reference.

In the above embodiments, the case where the direct wave measuring means 1 and the reflected wave measuring means 2 are separate is explained, but for example, it is also possible to use either one to perform rotation in the horizontal direction, up and down rotation, etc. The direct arriving wave and the reflected arriving wave are measured, and the elevation angle information θ5. θ, is input to the calculation means 3, and Wo, W.

It may be configured to calculate.

〔Effect of the invention〕

As described above, according to the present invention, it is possible to measure the elevation angle of an incoming direct wave and the elevation angle of a reflected wave, and calculate the distance to the source from these elevation angles and externally input height information. Therefore, it is no longer necessary to separate the two measuring means by a predetermined distance on the measurement point side as in the past, and it is possible to provide an unprecedented and excellent distance measuring device that can measure distance even in a narrow place.

[Brief explanation of the drawing]

FIG. 1 is a configuration diagram showing one embodiment of the present invention, and FIG.
FIG. 3 is an explanatory diagram showing the overall operation, and FIG. 3 is an explanatory diagram showing a conventional example. 1... Direct wave measuring means, 2... Reflected wave measuring means, 3
...Arithmetic means, Po...Position of radio wave source, Ao.
...Measurement reference point, Wo...distance. Patent applicant: Japan Electric Co., Ltd. Agent Patent attorney: Isamu Takahashi Figure 1 Figure 2

Claims (1)

[Claims] (1) A direct wave measuring means that measures the elevation angle of a direct arriving wave from a radio wave source at a predetermined height position, and a direct wave measurement means that measures the elevation angle of a reflected arriving wave that arrives after radio waves from the same source are reflected on the ground. Reflected wave measuring means for measuring at the same position as the direct wave measuring means is provided, and the distance to the radio wave source is determined based on the elevation angle information measured by each of the measuring means and the height information of the measuring position. A distance measuring device characterized by comprising a calculation means for calculating.