JPS61283875A - Antenna position detector - Google Patents

Abstract

PURPOSE:To eliminate errors in the measured value of a receiving antenna, by using a small-capacity battery with limited metal parts and an optical fiber cable as transmission line. CONSTITUTION:As an antenna 1 slides along an antenna sliding guide 2 to reach a position detection switch 3, a switch 3 is pushed with a leg of the antenna 1 to close the contact. Current flows through a light emitting element 4 connected in series to the switch 3 through a battery 5 to have the element 4 emitting light, which is made incident into a light receiving element 8 passing through an optical fiber cable 7 and converted into an electrical signal to be introduced to a processing circuit 9 for the detection of position. The battery 5 for driving the element 4 shall be of a small-capacity type to reduce the reflection of radio waves caused at a metal part. For this purpose, a solar battery 6 is added to replenish the power to be consumed by the battery 5. This can extend the exchange cycle of the battery.

Description

[Detailed description of the invention] [Technical field to which the invention pertains] The present invention is combined with a non-metallic guide for positioning a receiving antenna for measuring radio waves by sliding, and is used to adjust the position of the antenna when setting the antenna to move. It relates to a device for detecting.

[Prior art]

Conventionally, antenna position detection devices used for this type of measurement are 1. When the receiving antenna moves along the guide and reaches a predetermined position, an electrical circuit is closed and an electrical signal is generated. This electrical signal is then sent to a remote location via a metal conductor transmission line, where it is possible to identify the set position of the antenna.

However, with such conventional antenna position detection devices,
Since the transmission line that sends electrical signals is a metal conductor, the radio waves reflected by the transmission line must be combined with the radio waves that should be measured and received by the antenna, and as a result, the value measured by the receiving antenna is It has the disadvantage of causing errors.

[Purpose of the invention]

An object of the present invention is to eliminate the use of transmission lines made of metal conductors around the antenna in order to eliminate the above-mentioned drawbacks of the conventional technology, thereby preventing disturbance of the radio waves to be measured and preventing errors from occurring in the measured values of the receiving antenna. An object of the present invention is to provide an antenna position detection device that can perform the following operations.

[Structure of the invention]

The antenna position detection device according to the present invention is combined with a non-metallic guide for positioning a receiving antenna for measuring radio waves by sliding, is fixed at a predetermined position of the guide, and is fixed to a predetermined position of the guide by sliding the antenna. a switch that is driven to close in the position, a light emitting element that converts an electrical signal generated by closing the switch into an optical signal, a battery for driving the light emitting element via the switch, and the light emitting element. and an optical cable that receives an optical signal and transmits the optical signal to a remote location.

The antenna is characterized in that the position of the antenna on the guide is identified by detecting the optical signal at the remote position.

[Embodiments of the invention]

Next, an embodiment of an antenna position detecting device according to the present invention will be described with reference to one drawing.

FIG. 1 is a diagram showing the configuration of an embodiment according to the present invention. In this figure, 1 is a receiving antenna for measuring electric field strength, 2 is an antenna sliding guide provided on the antenna 11 so that it can be moved and measured along a predetermined route, and 3 is a device for detecting the antenna position. 4 is a light emitting element (LED);
5 is a small capacity battery, 6 is a solar cell, 7 is an optical fiber cable, 8 is a light receiving element, and 9 is a processing circuit. To explain the operation of this embodiment, first, when the antenna 1 slides along the antenna sliding guide 2 and reaches the 9-position detection switch 3, the 1-position detection switch 3 is pushed by the leg of the antenna 1. Close the contact. As a result, current flows to the light emitting element 4 connected in series with the switch 3 via the battery 5t.

The light emitting element 4 emits light. The emitted light passes through the entire optical fiber cable 7 and enters a light receiving element (photodiode, phototransistor, etc.) 8.

Here, it is converted into an electrical signal and guided to the processing circuit 9 for position detection.

Note that the battery 5 for driving the light emitting element 4 is as follows.

Small capacitors are used to reduce the reflection of radio waves that occurs on metal parts. therefore.

A solar battery 6 is added to supplement the power consumed by the battery 5. by this.

Battery replacement cycles can be extended.

In this embodiment, the antenna sliding guide is formed parallel to the ground and long in an arc shape when, for example, horizontal characteristics as seen from the radio wave generation source are to be measured, and when vertical characteristics are to be measured. It is erected vertically from the ground. Further, the number of sets of antenna position detection devices can be provided at a plurality of locations, and the set positions can be moved and adjusted as necessary.

According to the above embodiment, only batteries or solar cells with few metal parts are used on the guide side of the antenna position detection device, and no metal conductor transmission line is used between the antenna position detection device and the receiving end. There is no interference from radio waves during reception measurements. For example, as in the case of the prior art.

Antenna induced voltage t” obtained by the measured radio wave
If vo is the induced voltage of the antenna caused by the reflected wave (secondary radiation wave) of a metal conductor, etc., then the measurement error ε
teeth.

occurs like this. Of course, if V,=Q.

If ε=O (dB), no additional error will occur.

〔Effect of the invention〕

As is clear from the above explanation, according to the present invention, since a small-capacity battery with few metal parts and an optical fiber cable are used as transmission lines, it is not necessary to set many antenna position detection points. Of course, the radio wave measurement by the antenna can be obtained without error, and various characteristics can be obtained accurately by changing the measurement position as well as the measurement level, which has a great effect on improving reliability.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing the configuration of an embodiment according to the present invention. In this figure, 1 is a receiving antenna. 2 is an antenna sliding guide, 3 is a position/detection switch,
4 is a light emitting element, 5 is a battery, and 6 is a solar cell.

Claims (1)

[Scope of Claims] 1. A receiving antenna for receiving radio waves to be measured is combined with a non-metallic guide for positioning by sliding, and is fixed at a predetermined position on the guide, and is fixed at a predetermined position on the guide, and a light-emitting element that converts an electrical signal generated by closing the switch into an optical signal; a battery for driving the light-emitting element via the switch; and an optical cable that receives an optical signal and transmits the optical signal to a remote position, and the position of the antenna on the guide is identified by detecting the optical signal at the remote position. antenna position detection device. 2. An antenna position detection device according to claim 1, characterized in that a solar cell is added, and the solar cell supplies power consumed by the battery. .