JP2573375Y2 - Wireless antenna device for diesel locomotives - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a radio locomotive antenna device for a diesel locomotive used when a diesel locomotive is steered by radio.

[0002]

2. Description of the Related Art There is a case where a bogie is connected to a diesel locomotive, and an operator gets on top of the bogie and connects another bogie. In other words, when the diesel locomotive is to be driven by one person, the operator is at the head of the bogie because the bogie of the diesel locomotive is connected and driven while checking the traveling direction. In this case, since the operator does not get on the locomotive, the diesel locomotive is operated wirelessly.

FIG. 2A shows a state in which a plurality of bogies 1, 2, and 3 are connected to a locomotive 10, an operator 4 rides on the head of the endmost bogie 3, and wirelessly controls the locomotive 10. Is shown. There are two types of antennas for the diesel locomotive 10, which are as shown in FIG. The schemes shown in FIGS. 2B and 2C correspond to antennas 11 and 1.
2 is attached to the front and rear with respect to the rail direction of the locomotive 10, and the directivity direction of the antenna 11 is directed to the first direction A, and the directivity direction of the antenna 12 is directed to the second direction B (directly opposite to the first direction). ing. This is not always used only in the state shown in FIG. 2A, and a bogie may be used by being connected to the other side of the locomotive 10 opposite to the state shown in FIG. This is because the radio wave from the operator's wireless device comes from the direction B.

In the system shown in FIG. 2B, the antennas 11, 1
The high frequency coming from 2 is introduced into the coupler 21, combined and guided to the receiver 22. In the method shown in FIG. 2 (C), the high-frequency waves coming from the antennas 11 and 12 are guided to the first and second input terminals of the selection circuit 31, and the antenna output having a good reception state is selected and guided to the receiver 32. I have.

According to the antenna system shown in FIG. 2B, a combined output of an antenna output having a large reception input level and a small antenna output is smoothed due to the relationship between the direction of arrival of radio waves and the directivity of the antenna. Will be entered.
At this time, coupling loss due to synthesis also occurs. For this reason, the receiver receives the fluctuation (fading) of the reception input caused by the running of the locomotive almost directly. Therefore, depending on the surrounding conditions, when the notification distance reaches a certain level, the effect of fading cannot be suppressed, the notification limit is reached, and the remote control becomes unstable.

In the antenna system shown in FIG. 2C, the signal is usually received by one antenna having directivity in the direction of arrival of the radio wave. Although there is no antenna coupling loss due to combining compared to the previous method, the reception efficiency is good, but when the reception input level decreases due to fading, switching from one antenna to the other antenna, but the directivity is different even when switching. Average reception level is low. Therefore, the reception level becomes such that the antenna is immediately switched to the original one antenna. The antenna switching can be automatically switched by monitoring the reception level. However, when the reception input level decreases due to fading, the switching frequency increases. And a certain notification distance (number of connected vehicles)
At that point, the notification limit is reached and remote control becomes unstable.

[0007]

As described above, although the conventional antenna system for operating a locomotive uses two antennas, its effective use has not been obtained. Therefore, an object of the present invention is to provide a wireless antenna device for a diesel locomotive, which can improve reception efficiency and reliability of remote control.

[0008]

According to the present invention, an antenna having two-way directivity in the rail direction is installed on one side and the other in the rail direction of a locomotive, and the output of each two-way directional antenna is received. The configuration is such that a higher input level is supplied to a selection circuit for selecting the input level, and the output selected by the selection circuit is guided to a receiver.

[0009]

According to the above-mentioned means, radio signals are always received by two antennas, and a radio signal having a high reception input level and a good reception state is selected, so that the reception state can be stabilized.

[0010]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 shows an embodiment of the present invention. 100
Is a diesel locomotive, and the locomotive 100 has a receiver 101 mounted thereon. The antenna input to the receiver 101 is introduced from the selection circuit 102. The selection circuit 102 has two antenna terminals, to which the antenna outputs from the first and second antennas 103 and 104 installed on one side and the other in the rail direction of the locomotive are respectively introduced. The selection circuit 102 detects, for example, the level of the intermediate frequency obtained by the receiver 103, and when this level falls below a certain threshold value, generates an antenna switching signal and switches the antenna path to be introduced to the receiver 103. It has become.

Here, each of the antennas 103 and 104 has a bidirectional directivity. Therefore, for example, even when the reception level decreases when a radio wave arrives from the directional direction A of the antenna 103 and the antenna 104 is switched to the antenna 104, the antenna 104 also has the directional direction A, so that the input level sharply increases as in the related art. It does not decline. The same applies to a case where the antenna 104 is switched to the antenna 103 while receiving a radio wave from the directivity direction B by the antenna 104. As described above, according to this method, two antennas are selected so as to compensate for the level decrease due to fading, and a diversity effect can be sufficiently obtained. Even if the intensity of the used radio wave is used with the same output as the conventional one, the communication distance (the number of connected vehicles) increases, and the reliability of the reception state and the reliability of the remote control can be improved.

[0013]

As described above, according to the present invention, the reception efficiency can be improved, the reception state can be stabilized, and the reliability of remote control can be improved.

[Brief description of the drawings]

FIG. 1 is a configuration explanatory view showing an embodiment of the present invention.

FIG. 2 is an explanatory diagram for explaining an antenna system of a conventional diesel locomotive.

[Explanation of symbols]

100: diesel locomotive, 101: receiver, 102:
Selection circuit, 103, 104 ... antenna.

Continuation of the front page (58) Field surveyed (Int. Cl. ⁶ , DB name) B61L 1/00-23/34 H04B 7/10 B61C 17/12

Claims (1)

(57) [Scope of request for utility model registration] An antenna having bidirectional directivity in the rail direction is installed on each of one side and the other side of a rail direction of a locomotive, and an output of each bidirectional directional antenna is selected to have a higher reception input level. A radio antenna device for a diesel locomotive, characterized in that the output is supplied to a selection circuit and the output selected by the selection circuit is guided to a receiver.