JP2002190085A - Receiver hindrance detecting method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To quickly and easily detect hindrance to a receiver even when the receiver is not in a receivable condition in a dam discharge alarming system including a control part transmitting a discharge alarm signal and the receiver receiving the discharge alarm signal. SOLUTION: By monitoring oscillation of quartz inside the receiver, hindrance can be detected in non-receiving condition, and the hindrance to the receiver can be detected in a real time.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a failure detection system for a receiver in a dam discharge warning system.

[0002]

2. Description of the Related Art As a conventional technique, a method of detecting a failure by monitoring a time until a squelch is released at the time of reception, and a method of detecting a failure when an input electric field is smaller than a preset value. Was an obstacle to

[0003]

In the above-mentioned prior art, the receiving state is set, and the detection is not possible unless the receiver actually operates, so that the failure detection is delayed. In particular, the switching timing is delayed in a double system. And the like. SUMMARY OF THE INVENTION An object of the present invention is to provide a receiver failure detection method which eliminates the above-mentioned drawbacks and can quickly and easily detect a failure in a receiver even when the receiver is not in a reception state.

[0004]

In order to achieve the above object, the present invention comprises a monitoring means for constantly monitoring a crystal oscillation signal in a receiver. This enables failure detection.

[0005]

An embodiment of the present invention will be described below with reference to FIG. Discharge alarm control unit 3 in the discharge alarm device
Is the heart of the system.

In FIG. 2, a discharge alarm control section 3 rectifies the oscillation signals of the respective crystals of the receiver 1 and the receiver 2, converts the oscillated signals into digital levels by a DC amplifier, and converts the oscillated signals into digital signals via Di.
This is taken into the PU, and the CPU monitors whether the crystals of the receiver 1 and the receiver 2 oscillate normally. When the receiver 1 fails and the crystal oscillation stops, there is no Di input of the discharge warning control unit. Therefore, the CPU detects the failure of the receiver 1 and the CPU 1 detects the failure of the receiver 1 via the Do.
To the receiver 2 and sends fault information of the receiver 1 to the operation panel. Therefore, when a failure occurs, the system is immediately switched to the standby system, and information on the failure is displayed on the operation panel.

In this way, by constantly monitoring the oscillation state of the crystal inside each receiver, a failure in the receiver can be immediately detected even during periods other than the reception state.

[0008]

According to the present invention, even if the receiver does not actually enter the receiving state, the failure of the receiver can be detected.
In particular, in a dual system or the like, the timing for switching to the standby system is advanced, and fault information is immediately transmitted, so that the reliability can be significantly improved.

[Brief description of the drawings]

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

FIG. 2 is a system diagram showing one embodiment of the present invention.

[Explanation of symbols]

 1, 2: Receiver, 3: Discharge alarm control unit.

Claims (3)

[Claims] 1. A dam discharge warning system including a control unit for transmitting a discharge warning signal and a receiver for receiving the discharge warning signal, comprising: a monitoring unit that monitors oscillation of crystal inside the receiver. A receiver failure detection method for detecting a receiver failure. 2. The receiver fault detection system according to claim 1, wherein said monitoring means constantly monitors the oscillation of the crystal inside said receiver, so that said receiver can be operated during a period other than when a discharge warning signal is received. A receiver failure detection system configured to detect a failure of the receiver. 3. The receiver failure detection system according to claim 1, wherein said control means is provided with said monitoring means.