JP2759158B2 - Intrusion detection device - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to an intrusion detection device for crime prevention using microwaves or the like.

[Conventional technology]

Conventionally, there is an intrusion detecting device in which a transmitting device A 'and a receiving device B' are opposed to each other as shown in FIG. This intrusion sensing device receives a microwave (carrier) transmitted from a transmitting device A 'by a receiving device B', and determines whether there is an intruder between the transmitting and receiving units based on a change in the receiving intensity. is there. That is, if there is an intruder or the like between the transmitting device A 'and the receiving device B', the microwave is cut off, the receiving intensity is reduced, and an alarm is issued.

In the transmitting apparatus A 'shown in the figure, 1 is a microwave oscillator, 2 is an AM modulator for modulating the microwave from the microwave oscillator 1, and 3 is a microwave modulated by the modulator 2 in the direction of the receiving apparatus B'. A transmission antenna 5 for radiating a single-frequency (monotone) modulation signal to the modulator 2 is a single-frequency modulation signal generator.

In the receiving apparatus B ', 9 is a receiving antenna for receiving the microwave from the transmitting apparatus A', 10 is a microwave detector for demodulating the received microwave by AM, and 11 is an amplifier for amplifying the AM-demodulated microwave. , 12 is a level determination circuit that determines whether or not to take in the amplified microwave and output warning information, and 13 is an alarm output terminal that outputs the warning signal to a device that transmits the warning signal.

[Problems to be solved by the invention]

However, in such a conventional intrusion detection device, only the intensity change of the microwave is used as the information transmission signal, and the modulation method for transmitting the information adopts the AM modulation by a single low frequency. I just did. That is, since only the amplitude information of the microwave is used, the use efficiency of the radio wave is extremely low. Therefore, as for the current status information of the apparatus, only a failure that causes a change in the alarm signal has been stopped at a remote location.

The present invention has been made in order to solve the above problems, the purpose of which is to effectively utilize radio waves and wave media,
It is an object of the present invention to provide an intrusion detection device that makes it possible to obtain information on a device installed in a remote place without requiring large-scale wiring facilities or construction.

[Means for solving the problem]

To this end, a first aspect of the present invention is an intrusion detection device including a transmission device and a reception device that receives a wave medium transmitted from the transmission device, wherein the transmission device includes data for detecting blockage and device management of the transmission device. A means for transmitting a wave medium signal combined with data is provided.

In a second aspect based on the first aspect, the means includes a means for modulating a microwave generated by a microwave oscillator with a single frequency signal for detecting interruption and the device management data.

〔Example〕

Hereinafter, an intrusion detection device according to an embodiment of the present invention will be described. FIG. 1 is a block diagram of the intrusion detection device.
A is the transmitting device and B is the receiving device. The same components as those of the conventional (FIG. 4) apparatus are denoted by the same reference numerals.

In the present embodiment, the modulation signal is applied from the modulation signal control circuit 4 to the modulator 2 of the transmission device A.
The modulation signal control circuit 4 is connected to a single frequency (monotone) modulation signal generator 5, a data input circuit 6, and a control circuit 7. 8 is an external data input terminal.

In the level determination circuit 12 of the receiving device B, the amplifier 11
A part of the microwave amplified in the step is separated and taken in. 14 is a data decoder for receiving another separated microwave and decoding the data section of the demodulated signal.
Reference numeral 15 denotes a data output terminal for outputting a signal decoded by the data decoder.

The power to the transmitting device A and the receiving device B is supplied from a storage battery, a solar cell, or the like provided exclusively for each device.

FIG. 2 is a diagram of an alert detection system for intruding crime prevention in a wide area formed by combining a large number of pairs in which the transmitting device A and the receiving device B are spaced apart and opposed to each other. In this figure, seven pairs are installed in a link shape. C is the central unit,
It is connected to a transmitting device A1 as a base point of a system link and a receiving device B7 as a terminal point of the link. The central device C receives the data output and the alarm output of the receiving device B7.

Here, a pair of the transmitting device A and the receiving device B shown in FIG.
The operation of will be described. First, in the transmitting device A, the microwave generated by the microwave transmitter 1 is modulated by the AM modulator 2 and radiated from the transmitting antenna 3 into space.

In this case, the modulation signal to be applied to the AM modulator 2 is a single modulation signal (interruption detection data) from the single frequency modulation signal generator 5 and a data signal (device management data) from the control circuit 7 or the data input circuit 6. ) Is a signal obtained by repeating the signal as shown in FIG. 3 combined in the modulation signal control circuit 4 at a predetermined cycle. In this signal, a long H (high level) section indicates the beginning of data. This data is 5
It is represented by a simple code having a bit length. For this data section, NRZ code or Manchester code may be used.
As a data format, it is needless to say that a 7-bit ASCII code or a 1-bit start, 1-bit stop, 1-bit parity serial data format known by RS232C or the like can be used.

The control circuit 7 checks the device management state of the power supply voltage and the internal temperature of the transmission device, and when an abnormality is found, creates data indicating the abnormality and inputs the data to the modulation signal control circuit 4. In this circuit 4, a device abnormality code is created and added to the data section, and the microwave is modulated by the AM modulator 2 and transmitted from the transmitting antenna 3 to the receiving device B.

In the receiving device B, the microwave radiated from the transmitting antenna 3 of the transmitting device A is received by the receiving antenna 9, AM-demodulated by the microwave detector 10, and then amplified by the amplifier 11 to an appropriate amplitude. Is separated and taken into the level determination circuit 12 as information proportional to the amplitude of the microwave. The level determination circuit 12 determines whether or not the microwave beam between the transmitting device A and the receiving device B has been interrupted, and controls whether or not to transmit an alarm signal from the alarm output terminal 13. When monitoring without abnormality is continued, "normal" is output, and when abnormal (microwave beam cutoff), an alarm signal is output.

The other separated microwaves are input to the data decoder 14, decode the data section of the demodulated signal, and output from the data output terminal 15.

The signals output from the alarm output terminal 13 and the data output terminal 15 are input to the external data terminal 8 of the adjacent transmission device A.

Now, for example, between the transmitting device A3 and the receiving device B3 (section A3
When the microwave beam (referred to as B3) is cut off, the alarm output of the receiving device B3 becomes "abnormal" and is applied to the data input circuit 6 from the external data input terminal 8 of the transmitting device A4. As a result, the alarm data of the section A3B3 is created by the signal control circuit 4 and sequentially transmitted to B4, A5, B5, A6, B6, A7, B7, and the central unit C, and the central unit C detects "abnormal". Can be. Similarly, when the transmission device A2 has an internal abnormality, the data is transmitted to the central device C.

In the above embodiment, the device management data is limited to the data of the transmitting device A, but the management data of the receiving device B can be included in the data section.

In the above embodiment, one central device C is installed in one loop, but two or more central devices C can be installed. In this case, it is easy to determine the simultaneous cutoff at a plurality of locations.

Further, in the above embodiment, the microwave is used as the signal transmission medium, but another wave medium, for example, light, ultrasonic wave, or the like may be used. Further, the modulation method may be FM modulation or the like instead of AM modulation.

〔The invention's effect〕

As described above, according to the present invention, it is possible to add a management data signal of a power supply, a device, and the like to a signal transmission medium in addition to cutoff information, thereby increasing the utilization rate of the signal transmission medium. Therefore, it is possible to construct a security system with a wide-area network function that makes it possible to obtain various device information and the like at a remote location without requiring large-scale wiring facilities and construction.

[Brief description of the drawings]

FIG. 1 is a block diagram of an intrusion detection device according to one embodiment of the present invention, FIG. 2 is an explanatory diagram of an alert detection system formed using the intrusion detection device, FIG. 3 is a waveform diagram of a modulated signal, and FIG.
FIG. 1 is a block diagram of a conventional intrusion detection device. A: transmitting device, B: receiving device, C: central device, 1
... Microwave oscillator, 2 modulator, 3 transmission antenna, 4 modulation signal control circuit, 5 single-frequency (monotone) modulation signal generator, 6 data input circuit, 7
... Control circuit, 8 ... External data input terminal, 9 ... Reception antenna, 10 ... Microwave detector, 11 ... Amplifier, 12
…… Level judgment circuit, 13 …… Alarm output terminal, 14 …… Data decoder, 15 …… Data output terminal.

Claims (2)

(57) [Claims] 1. An intrusion sensing device comprising a transmitting device and a receiving device for receiving a wave medium transmitted from the transmitting device, wherein the transmitting device combines blocking detection data with device management data of the transmitting device. An intrusion detection device comprising means for transmitting a wave medium signal. 2. The intrusion sensing device according to claim 1, wherein
The intrusion sensing device according to claim 1, wherein said means comprises means for modulating a microwave generated by a microwave oscillator with a single frequency signal for detecting interruption and the device management data.