JP3133522B2 - Wireless abnormality monitoring equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wireless abnormality monitoring system for monitoring abnormalities such as fire, theft and gas leakage, and more particularly to a wireless abnormality monitoring system using spread spectrum communication.

[0002]

2. Description of the Related Art In a conventional abnormality monitoring equipment, for example, a fire alarm equipment, a fire detector is connected to a signal line drawn from a fire receiver to a warning area. A repeater is provided for each alert section for the receiver,
The fire detector is connected to the signal line drawn from the repeater.

Therefore, a signal line must be connected between the receiver and the fire detector, and between the receiver and the fire detector via a repeater, and the amount of wiring for the signal line and the cost are large. It increases with the scale, and accounts for a large proportion of equipment work and cost. On the other hand, wireless fire alarm systems have been put into practical use as fire alarm systems that are used temporarily on construction sites such as extension and remodeling. This wireless fire alarm system uses a predetermined assigned frequency, transmits fire detection information from a wireless fire detector using, for example, an FSK-FM modulation method, receives and decodes the information using a wireless receiver, and connects to an existing signal line. A fire detection signal is sent to the fire receiver of the fire alarm system in Japan.

[0004]

However, such a conventional wireless fire alarm system is special in that it is temporarily installed at a construction site and used, and the usable frequency band is determined. Since this frequency band is also used in wireless devices such as transceivers, there is always the problem of false alarms due to interference.

When a polling method is employed in which address information is sequentially transmitted from a receiver or a repeater in a wireless manner, and a fire detector is called back and monitoring information is returned, compared with the conventional wired system, interference with other wireless devices is caused. In addition, it is susceptible to various types of propagation disturbances such as propagation abnormalities and power surge noise, and it has been difficult to ensure the reliability and stability of equipment equivalent to conventional wired systems with wireless abnormality monitors. .

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned conventional problems, and provides a wireless abnormality monitoring facility capable of sufficiently assuring reliability and stability by using spread spectrum communication technology. With the goal.

[0007]

In order to achieve this object, the present invention is configured as follows. When spread spectrum communication is used for wireless abnormality monitoring equipment, the configuration of the device is classified as follows. (1) when abnormality is detected in the one-way communication method detecting device, a method for transmitting a predetermined pseudo-random sequence PN ₀ to monitoring devices such as repeaters and receivers.

[0008] Here, the abnormality detection signal is turned on, when the off signal, the transmission unit transmitting a predetermined pseudo-random sequence PN ₀ when an abnormality is detected in the detection device is provided, the monitoring device is transmitted from the sensing device pseudo-random sequence PN reception of ₀ to determine using the same pseudo-random sequence PN ₀ and assigned to the detection device abnormality detection reception output produces provided receiver.

If the abnormality detection signal is analog information, the data indicating the analog information is modulated and transmitted in a pseudo-random sequence. Further, when it is desired to know the position of the detection device, that is, the address, a message in a format including the address is created, and the message is modulated by a pseudo-random sequence and transmitted. (2) Bidirectional communication method This is a polling method in which a monitoring device such as a receiver or a repeater sequentially calls a terminal-side detection device and returns information, and wirelessly performs bidirectional transmission between the monitoring device and the detection device. This polling method is divided into the following two.

PN address system Each of the plurality of detection devices has a different address corresponding to an address.
Unique pseudo-random sequence PN₁ ~ PN_n Assign
Then, the monitoring device transmits the call information to the pseudo random sequence PN. ₁ ~ P
N_n Is modulated and transmitted. Terminal detection device
Is spread spectrum modulated transmitted from the monitoring device.
The pseudo-random sequence PNi assigned to itself.
Demodulate using.

In this case, a demodulated output is obtained only when the pseudo-random sequence used on the transmitting side matches the pseudo-random sequence used on the receiving side. Therefore, the same call can be performed as if the address of the detection device was specified only by assigning the pseudo-random sequence without sending the address information. The response from the detector is also the assigned unique pseudo-random sequence P
Transmission is performed by spread spectrum modulation using Ni. The monitoring device can receive the response information by using the pseudo-random sequence used for the call during the response period after the call.

[0012] Normally the address scheme and modulated and transmitted by pseudo-random sequence PN ₁ of a call address information assigned to each sensing device terminal, all of the sensing device uses the pseudo-random sequence PN ₁ for call Receives and demodulates address information. Demodulated address information is only detecting device is determined to be consistent in its allocation address, and transmits the modulated with a pseudo-random sequence PN ₂ for response its own abnormality detection information. The monitoring device at all times, and demodulates the received signal using the pseudo-random sequence PN ₂ for response, it receives and demodulates the abnormality detection information from the detecting apparatus that has performed the call to the response time after the call.

Further, in the case of the bidirectional transmission system, the distance from the monitoring device to the detecting device that has detected the abnormality can be measured. For example, when an abnormality is detected, a pseudo-random sequence for distance measurement is sent from the monitoring device to the detecting device that has detected the abnormality, and the pseudo-random sequence is returned upon reception. The monitoring device calculates a distance to the detection device based on a propagation time from transmission of the pseudo random sequence for measurement to reception thereof.

[0014]

According to the wireless abnormality monitoring equipment of the present invention having such a configuration, the wireless transmission between a monitoring device such as a receiver or a repeater and a detection device such as a fire detector installed in a terminal can be performed. Then, an autocorrelation with the received sequence is calculated using a reference sequence that matches the pseudo-random sequence used on the transmitting side, and an autocorrelation peak value obtained when the received sequence matches the reference sequence is demodulated as reception information.

[0015] For this reason, by performing spread spectrum communication by radio, such as abnormality detection information and call address information, it is resistant to interference by other wireless devices and noises, and has high reliability and stability without interfering with other wireless devices. Wireless transmission of high abnormality detection information. Further, by being able to measure the distance to the detection device that has detected the abnormality, it is possible to determine evacuation guidance in the event of a fire and to automatically set the water discharge distance to the fire position for the water discharge device.

[0016]

FIG. 1 is a block diagram showing a first embodiment of the present invention, taking a fire alarm system as an example. In FIG.
The receiver 1 is installed in a manager's office or the like of the building, and a signal line 2 drawn from the receiver 1 is provided with a repeater 3a for each floor.
3b, 3c and 3d are connected. The fire detectors 4a and 4 are provided in the guard area for each floor where the repeaters 3a to 3d are installed.
.. 4n are installed.

FIG. 2 is a block diagram showing an embodiment of the embodiment shown in FIG. 1 in which the relay and the fire detector installed on one floor are taken out and shown in detail. In FIG. 2, first, as shown on behalf of the fire detector 4a, the fire detectors 4a to 4n
A fire detection unit 5, a control unit 6 using a CPU, an SS transmission unit (spread spectrum transmission unit) 7, a PN sequence generator 8, a transmission antenna 9, and a battery power supply 10 are provided.

The fire detector 5 detects smoke, temperature, and the like accompanying the fire. The control unit 6 outputs bit data indicating a fire as fire detection information based on the fire detection output of the fire detection unit 5 if the fire detection signal from the fire detection unit 5 is an on / off signal. When an analog signal is output from the fire detection unit 5, the analog signal is converted into digital information and output. The SS transmitting unit 7 performs spread spectrum modulation on the transmission data from the control unit 6 using the pseudo random sequence signal output from the PN sequence generator 8, and
It is transmitted to the repeater 3.

On the other hand, the repeater 3 has the receiving antennas 11, S
An S receiving unit (spread spectrum receiving unit) 12, a PN sequence generator 13, and a control unit 14 using a CPU are provided. The SS receiving unit 12 performs a demodulation operation on a reception signal received by the reception antenna 11 using a pseudo-random sequence signal generated by a PN sequence generator 13. When a spread spectrum modulated fire detection signal is received from any of the fire detectors 4a to 4n, the pseudo random sequence included in the received signal matches the reference pseudo random sequence generated by the PN sequence generator 13. The control unit 14 restores the original fire detection information based on the data bits output from the SS receiving unit 12.

That is, when the fire detector outputs ON / OFF signals, the reception of the fire detection signal is determined when a predetermined data bit output is obtained from the SS receiving unit 12, while the fire detection signal is detected. When the sensor outputs the analog signal, the fire detection data corresponding to the original analog information is restored when a predetermined number of data bit outputs are obtained from the SS receiver 12.

The on, off, or analog fire detection information restored by the control unit 14 is sent to the receiver 1 via a signal line to perform a fire alarm, an interlocking control of various disaster prevention devices, and the like. In the above embodiment, the fire detection unit 5 outputs an ON / OFF signal or an analog signal. However, when it is desired to determine the addresses of the fire detectors 4a to 4n. The control unit 6 creates a message having a format configuration in which the address of the sensor is added to the fire information, and spreads and spreads the data bits indicating the message by the SS transmission unit 7 using a pseudo-random sequence. May be transmitted.

In the embodiment shown in FIG. 2, the PN sequence generators 8 provided in the fire detectors 4a to 4n and the repeater 3 are provided.
13 are the same,
When the repeaters 3a to 3d are provided for each floor as shown in FIG. 1, a different pseudo random sequence is assigned to each of the repeaters 3a to 3d, and a pseudo-random sequence for control with the fire detectors 4a to 4n is provided. It is desirable to perform spread spectrum communication using a random sequence.

By assigning a different pseudo-random sequence to each of the repeaters 3a to 3d, it is possible to prevent a transmission signal from a fire detector on another floor from being erroneously decoded. FIG. 3 is an example configuration diagram showing details of the SS transmission unit 7 provided in the fire detectors 4a to 4n in FIG.
The pulse spread modulation method is taken as an example.

In FIG. 3, the SS transmitter 7 is a mixer 1
5, a PN sequence generator 8 and a balanced modulator 17. The original signal A (t) PSK-modulated according to the transmission data bits 0 and 1 which is fire detection information is input to the mixer 15, and the pseudo-random sequence from the PN sequence generator 8 is applied to the original signal A (t). A transmission signal S (t) is generated by multiplying the signal P (t) as a carrier. Transmission signal from the mixer 15 S (t) is transmitted from the transmitting antenna 9 by modulating a carrier signal cos radio frequencies in balanced modulators 17 (ω _c t).

FIG. 4 is a block diagram of an embodiment showing details of the SS receiving section 12 provided in the repeater 3 of FIG. In FIG. 4, the SS receiving unit 12 includes a mixer 18, a PN sequence generator 1
3, a balanced modulator 19, an IF band pass filter 21, and a PSK demodulator 22. The SS receiving section 12 receives and demodulates the transmission signal from the SS transmitting section 7 of the pulsed spread modulation system shown in FIG. First, the PN sequence generator 13
Is the same pseudo-random sequence signal P as the transmitting side shown in FIG.
(T) is generated, and the carrier signal cos (ω _c + ω _IF ) t having the intermediate frequency component IF is modulated by the pseudo-random sequence signal P (t) in the balanced modulator 19, and the transmission-side pseudo signal shown in FIG. A pseudo inverse function signal Q (t) is generated for the random sequence signal P (t).

The signal Q (t) of the inverse function output from the balanced modulator 19 is multiplied by the received signal in the mixer 18, and when the cycle of the received signal completely matches the cycle of the signal Q (t) of the inverse function. Then, an intermediate frequency signal depending on the autocorrelation peak value is obtained. The IF band-pass filter 21 removes unnecessary band components from the intermediate frequency signal output from the mixer 18 and which depends on the autocorrelation peak value.
(T) is demodulated, and data bits are finally restored from the PSK signal.

FIG. 5 is a block diagram showing another embodiment of the SS transmitting section 7 provided in the fire detectors 4a to 4n in FIG. 2, and exemplifies a direct spread modulation system. In FIG. 5, the SS transmitter 7 includes a PN sequence generator 8, a mixer 15, a phase modulator 23, and a carrier oscillator 24. S
The transmission data A (t) including the data bits 1 and 0 indicating the fire detection information is given to the mixer 15 of the S transmission unit 7. For example, when the data bit of the transmission data A (t) is 1, the mixer 15 The pseudo random sequence P (t) from the PN sequence generator 8 is output to the phase modulator 23. On the other hand, if the data bit of the transmission data A (t) is 0, the mixer 15
Stops the output of the pseudo-random sequence.

The phase modulator 23 modulates the phase of the carrier signal of the carrier frequency from the carrier oscillator 24 with the pseudo random sequence signal corresponding to the data bit 1 output from the mixer 15, and transmits the modulated signal from the transmitting antenna 9. That is, the pseudo-random sequence from the mixer 15 is a bit string of data bits 0 and 1 of a predetermined number of elements, for example, 511 elements (511 words).
The carrier frequency from 4 is sufficiently high and is a frequency that is an integral multiple of the bit rate, and performs phase modulation for inverting the phase of the carrier signal with a change of 0 to 1 or 1 to 0 of the data bit.

FIG. 6 is a block diagram of an embodiment showing the details of the SS receiver 12 provided in the repeater 3 of FIG. 2 corresponding to the direct spreading modulation system of FIG. 6, the SS receiving unit 12 includes a phase demodulator 25, a carrier oscillator 26, an A / D
Converter 27, shift register 28, correlation calculator 2
9, a PN sequence generator 13 and a comparator 50.

The phase demodulator 25 demodulates the original pseudo-random sequence signal from the received signal received by the receiving antenna 11 using the carrier signal generated by the carrier oscillator 26.
The demodulated pseudo-random sequence signal is supplied to the A / D converter 2
7 and converted into digital data.
Are sequentially input. The shift register 28 uses the number of stages corresponding to the number of elements (word length) of the used pseudo-random sequence.

The correlation calculator 29 calculates the product sum for each element of the received sequence sequentially input to the shift register 28 and for each element of the same pseudo-random sequence signal generated by the PN sequence generator 13 as on the transmitting side in FIG. You are doing autocorrelation. Correlation calculator 29 outputs an autocorrelation peak value when the received sequence input to shift register 28 matches the pseudo-random sequence generated by PN sequence generator 13, and comparator 50 outputs the autocorrelation peak value. It discriminates and outputs data bit 1 as transmission data A (t).

Of course, when the autocorrelation peak value cannot be obtained from the correlation calculator 29 at the demodulation timing of one data bit, the output of the comparator 30 outputs the data bit 0. FIG. 7 is a block diagram showing an embodiment of the second embodiment of the present invention. In this embodiment, a polling system for sequentially calling fire detectors from a repeater and returning fire detection information is adopted. As a feature, two-way communication using spread spectrum communication is performed between the repeater and the fire detector.

In FIG. 7, the fire sensors 4a to 4n include a control unit 30 using a CPU, an SS transmission unit 31, a PN sequence generator 32, a transmission / reception antenna 33a, and SS receiver 34 and battery power supply 10
Is provided. The repeater 3 has a transmitting / receiving antenna 33
b, an SS transmission unit 35, an SS reception unit 36, a PN switching generation unit 37, and a control unit 38 are provided.

In the embodiment of FIG. 7, the fire detector 4a
To 4n unique pseudo-random sequences PN ₁ , PN
_2, and allocates a · · · PN _n, each of the PN sequence generator 32 outputs assigned unique pseudo-random sequence PN ₁ to PN _n to each SS transmitter 31 and the SS receiver 34. Moreover, PN switching generator 37 of the relay station 3 uses a pseudo-random sequence PN ₁ to PN _n assigned to the fire detector 4a~4n as call address information. For this reason, the PN switch generation unit 37 assigns the same pseudo-assignment to the SS transmission unit 35 and the SS reception unit 36 by the PN switch generation unit 37 on the sensor side for each sensor call cycle controlled by the control unit 38. Random sequence PN ₁ -PN _n
Are sequentially generated, and this is repeated.

The SS transmitting section 35 of the repeater 3 receives call data as a telegram including a call command from the control section 38 for each call cycle of the fire detector, and at this time, detects the call destination output from the PN switch generating section 37. The transmission data is spread spectrum modulated using the pseudo random sequence PNi corresponding to the device address, and transmitted from the transmission / reception antenna 33b. For example, the SS transmitting unit 35 modulates and transmits the call data using the pseudo-random sequence PN1 assigned to the fire detector 4a.

The transmission signal from the repeater 3 is a fire detector 4a.
~ 4n are received at the same time and each SS
By the receiver 34 using a pseudo-random sequence PN ₁ to PN _n assigned to the self to obtain a demodulated output by the autocorrelation calculation. Since it is at this time modulates transmitted using pseudo-random sequence PN _1, the relay device 3, data corresponding to the autocorrelation peak value only at SS receiver 34 of the fire detector 4a assigned a pseudo-random sequence PN ₁ A bit demodulated output is obtained.

[0037] In the other fire detectors 4B～4n, a pseudo-random sequence PN ₂ to PN _n to be used for demodulation, because different from the pseudo-random sequence PN ₁ which is used for transmission, the autocorrelation peak value obtained I can't. Consequently it can establish communication between the pseudo-random sequence PN ₁ to the corresponding repeater 3 and the fire sensor 4a only. The call data received and demodulated by the SS receiving unit 34 is supplied to the control unit 30. The control unit 30 creates a response message in a format including current detection information based on the output of the fire detection unit 5, and generates an SS transmission unit 31. Output the transmission data to SS transmitter 31 is spread spectrum modulated using a pseudorandom sequence PN ₁ from the PN sequence generator 32, it is transmitted from the transmitting and receiving antenna 33a. The transmission signal from the fire detector 4a is received by the transmission / reception antenna 33b of the repeater 3 and given to the SS receiver 36.

At this time, since the PN switch generator 37 has switched to the state of generating the pseudo random sequence PN ₁ assigned to the fire detector 4a, the SS receiver 36 receives and demodulates the data bits based on the autocorrelation peak value. A data bit string indicating the received fire detection information is output to the control unit 38,
The control unit 38 restores the electronic message including the fire detection information in a predetermined format.

The data indicating the fire detection information restored by the control unit 38 is sent to the receiver 1 via a signal line, and a fire determination is performed. If a fire is determined, a fire alarm and interlocking control of disaster prevention equipment are performed. Will be done. FIG. 8 shows the repeater 3 of FIG.
It is the flowchart which showed the call control of the fire detector in FIG.

In FIG. 8, the control unit 38 of the repeater 3
First, in step S1, a designated counter A indicating a pseudo-random sequence generated by the PN switching generator 37 is initialized, and A =
Let it be 1. Next, the process proceeds to step S2, and the process proceeds to step S3 in a state where the generation is switched to the generation of the A-th pseudo-random sequence specified by the counter A, and a command for polling the fire detector is issued.

The calling command issued in step S3 is given to the SS transmitting unit 35, and in step S2, the pseudo-random sequence currently generated in the PN switch generating unit 37, for example, the pseudo-random sequence PN corresponding to the fire detector 3a. By using ₁ , the data bit indicating the call command is spread-spectrum modulated and transmitted. At the same time, the SS receiver 36 is set with the same pseudo-random sequence PN _1, a receivable state of the response data using a pseudo-random sequence having sequence PN ₁ from SS transmitter 31 provided in the fire detector 4a ing.

[0042] Subsequently has determined the existence of a response from the fire detector side in step S4, when it is the response received from the fire detector 4a which corresponds to the pseudo-random sequence PN ₁ generated proceeds to step S5, receives A process is performed based on the data indicating the detected state of the fire detector. Subsequently, in step S6, it is determined whether or not the counter A has reached the number n of the fire detectors 4a to 4n.
After the counter A is incremented by one at step S,
2 and the pseudo-random sequence PN of the next fire detector 4b
Switch to ₂ and repeat the same process.

As described above, in the embodiment of FIG. 7, the pseudo-random sequences PN ₁ -P unique to the fire detectors 4a-4n.
By allocating N _n and performing spread spectrum communication with the repeater 3, the address is not required, and
Commands and data can be directly transmitted and received.
Next, as another embodiment of the polling device shown in FIG.
Commands and data may be transmitted and received using the address data. When used in this manner the address data may only use two for the pseudo-random sequence PN ₁ as a pseudo-random sequence PN ₂ for response call.

[0044] That is, SS transmitter 35 and the SS receiver 34 of the fire detector 4a~4n repeater 3 performs modulation and demodulation using the pseudo-random sequence PN ₁ for call while the fire detector 4a~ SS receiver 36 of SS transmitter 31 and the repeater 3 of 4n may be to perform modulation and demodulation by using the pseudo-random sequence sequence PN ₂ for response. in this way,
Two pseudo-random sequences PN ₁ and PN for calling and answering
_If the address, command or data is transmitted and received using ₂ , only two types of pseudo-random sequences need to be used for each repeater, and the pseudo-random sequences used by a plurality of repeaters are made different to prevent interference. To prevent this, the number of pseudo-random sequences used can be reduced, and the device configuration can be simplified.

FIG. 9 is an explanatory view showing an embodiment for measuring a distance from a monitoring device such as a receiver or a relay to a detection device such as a fire detector in the wireless abnormality monitoring equipment of the present invention. . For example Taking as an example the device configuration of the polling method of Fig. 7, when the relay 3 as shown in FIG. 9 was calling the fire detector 4a using a pseudo-random sequence PN _1, fire detector 4a is pseudo-random sequence PN ₁ simultaneously with the reception of the modulated signal using the carry out a return for the repeater 3.

More specifically, for example, directional coupling may be performed in which the reception input to the mixer 18 of the SS receiver 12 shown in FIG. 4 is directly returned to the transmission antenna 9 of the SS transmitter 7 shown in FIG. Therefore, as shown in FIG. 9, the modulated signal using a pseudo-random sequence PN ₁ received by the fire sensor 3, at the same time sent back again to the repeater 3 and receiver. In the relay station 3 starts a timer at the transmission end time t ₁ using the pseudo random sequence PN _1, obtained autocorrelation peak value by the demodulation of the received signal that has been returned is received in the fire sensor 3 It was time t ₂ stops timer to measure the elapsed time T until the end of reception from the transmission start.

The elapsed time T from transmission to reception is the sum of the propagation time τ from the repeater 3 to the fire detector 3 and the propagation time τ from the fire detector 3 to the repeater 3. Therefore, the propagation speed c of the radio wave is c = 3 × 10 ⁸ m / s
Assuming ec, the distance R from the relay 3 to the fire detector 4a can be calculated as R = C × (T / 2) = C × τ.

The measurement of the distance shown in FIG.
Is not limited to the configuration of the polling system capable of two-way transmission, and the one-way transmission from the fire detector to the repeater 3 also transmits the reception signal of the antenna 9 to the SS transmitter 7 of the fire detectors 4a to 4n. This can be easily realized by adding a path for directional coupling to the power amplification section at the last stage of the section. FIG.
FIG. 9 is a block diagram showing another embodiment of the present invention. In this embodiment, a signal transmitted from a fire detector by spread spectrum modulation is received and demodulated to control a fire prevention device such as a water discharge gun. It is characterized by doing so.

In FIG. 10, repeaters 3a to 3d are provided for each floor on the signal line 2 drawn from the receiver 1, and each of the repeaters 3a to 3d has, for example, a water gun 40a to 40d. And ITV cameras 42a to 42d are connected to signal lines. As one example in FIG. 10, the transmission signals by the spread spectrum modulation from the fire detectors 4a to 4n are received and demodulated by the repeaters 3a to 3d, and based on the received data, the water discharge guns 40a to 40d and the ITV cameras 42a to 42d. 42d.

In another embodiment, the water discharge guns 40a-
The same SS receiver as the repeater 3a is provided in each of the 40d and the ITV cameras 42a to 42d, and the fire detectors 4a to 4d are provided.
d, and directly receives a transmission signal based on spread spectrum modulation from any one of the water spray guns 40a to 40d to control the water discharge of the water spray guns 40a to 40d or to activate the ITV cameras 42a to 42d to shoot the fire place.

In particular, regarding the control of the water discharge guns 40a to 40d and the ITV cameras 42a to 42d, the water discharge guns 40a to 40d are provided with a measuring function for measuring the distance of a fire detector or the like which detects a fire shown in FIG. The water discharge distance can be automatically set, and in the shooting control of the ITV cameras 42a to 42d, the distance to the fire occurrence location is determined by the receiver 1.
It becomes possible to know on the side.

Of course, the apparatus configuration used in the embodiment of FIG. 10 may be the one-way transmission system shown in FIG. 2 or the two-way transmission system shown in FIG. In the above embodiment, the fire alarm system is taken as an example. However, the present invention can be applied to other appropriate abnormality monitoring systems such as a gas leak monitoring system and a theft monitoring system.

Also, since a wireless detection device such as a fire detector is operated by a built-in battery power source, the one-way transmission system uses a relay or a receiver as a periodic notification of the state of exhaustion of the battery power source. In the polling method for performing bidirectional transmission, information indicating a battery consumption state may be included in response information data and transmitted to the repeater or the receiver side.

Further, in the above embodiment, the radio transmission between the repeater and the fire detector is taken as an example. However, in a small-scale facility, the direct connection between the receiver and the fire detector is made. Wireless transmission will be performed.

[0055]

As described above, according to the present invention, the exchange of information between a monitoring device such as a receiver and a repeater and a detection device such as a fire detector installed on the site is spread spectrum. Because it is performed by wireless transmission using communication, it is stable without being restricted by frequency allocation as in ordinary wireless devices, affecting other wireless devices, and not receiving interference from other wireless devices Abnormality monitoring by wireless with high reliability and reliability can be realized.

Further, by individually assigning a pseudo-random sequence used for spread spectrum communication, the pseudo-random sequence itself has a function as an address of each device. A call can be realized. Furthermore, by transmitting and receiving transmission signals by spread spectrum modulation using a pseudo-random sequence, the distance from the monitoring device to the detection device can be measured based on the propagation time from transmission to reception, and it can be used for disaster prevention devices such as water guns. Control can be performed more appropriately.

[Brief description of the drawings]

FIG. 1 is a configuration diagram illustrating an embodiment of the present invention that performs one-way transmission.

FIG. 2 is a configuration diagram of an embodiment showing details of a fire detector and a repeater of FIG. 1;

FIG. 3 is a configuration diagram of an embodiment of an SS receiver performing one-way transmission in FIG. 2;

FIG. 4 is a block diagram of an embodiment of the SS receiving unit of FIG. 2 corresponding to FIG. 3;

FIG. 5 is a configuration diagram of another embodiment of the SS receiving unit in FIG. 2;

FIG. 6 is a block diagram of another embodiment of the SS receiver of FIG. 2 corresponding to FIG.

FIG. 7 is a block diagram showing a second embodiment of the present invention for performing bidirectional transmission;

FIG. 8 is a flowchart showing a polling process in the repeater of FIG. 7;

FIG. 9 is an explanatory diagram showing a distance measuring function of the present invention.

FIG. 10 is a block diagram of an embodiment showing another embodiment of the present invention for controlling a terminal device.

[Explanation of symbols]

 1: Receiver 2: Signal line 3: Repeater 4a to 4n: Fire detector (detection device) 5: Fire detector 6, 14, 30, 38: Controller 7, 31, 35: SS transmitter 8, 13 , 32: PN sequence generator 9: transmitting antenna 10: battery power supply 11: receiving antenna 12, 34, 36: SS receiver 15, 18: mixer 17, 19: balanced modulator 21: IF bandpass filter 22: PSK demodulation Modulator 23: phase modulator 24, 26: carrier oscillator 25: phase demodulator 27: A / D converter 28: shift register 29: correlation calculator 50: comparator 33a, 33b: transmitting / receiving antenna 37: PN switching generator 40a to 40d : Water gun 42a-42d: ITV camera

Claims (8)

(57) [Claims] 1. A wireless abnormality monitoring facility in which a plurality of detection devices are installed in a guard area and a transmission signal from the detection device is received and processed by a monitoring device, wherein an abnormality is detected by the detection device. Sometimes provided with a transmission unit for transmitting a predetermined pseudo-random sequence signal, by using the same pseudo-random sequence as assigned to the detection device to receive the pseudo-random sequence signal transmitted from the detection device to the monitoring device, Set up a receiver that generates anomaly detection reception output.
The detection device performs a regular notification in a regular monitoring state,
The visual observation device generates a fault based on the periodic notification from the detection device.
A wireless abnormality monitoring facility that determines liveness. 2. A wireless abnormality monitoring facility in which a plurality of detection devices are installed in a guard area and a transmission signal from the detection device is received and processed by a monitoring device, wherein an abnormality is detected by the detection device. A transmitting unit for transmitting the abnormal detection information by performing spread spectrum modulation with a predetermined pseudo random sequence, and providing the monitoring device with the same pseudo code as that assigned to the detection device from the spread spectrum modulation signal transmitted from the detection device. only set a monitoring device having a reception unit for demodulating the abnormality detection information using the random sequence, the detection device performs periodic report at steady monitoring state, the superintendent
The visual observation device generates a fault based on the periodic notification from the detection device.
A wireless abnormality monitoring facility that determines liveness. 3. The wireless abnormality monitoring equipment according to claim 1, wherein a different pseudo-random sequence is assigned to each of the plurality of detecting devices, and the plurality of monitoring devices are the same as those assigned to the plurality of detecting devices. A wireless abnormality monitoring facility comprising means for determining a detection device that has detected an abnormality by reception demodulation using a random sequence. 4. A wireless abnormality monitoring facility in which a plurality of detection devices are installed in a guard area corresponding to one monitoring device, and the monitoring devices sequentially call the detection devices and return status detection information. A paging transmission unit for sequentially transmitting spread-spectrum-modulated paging information to the monitoring device with different pseudo-random sequences (PN _{1 to} PN _n ) assigned to the plurality of detection devices, and
A call receiving unit for demodulating state detection information from a spread spectrum modulated signal returned from the detection device using a pseudo-random sequence (PNi) same as that used at the time of the call during a response period after the call; A demodulator for demodulating call information using a unique pseudo-random sequence (PNi) assigned to itself from a spread spectrum modulated signal for call transmitted from the monitoring device, and a demodulated output from the receiver. A wireless abnormality monitoring facility, comprising: a transmission unit that, when obtained, transmits a state detection information by performing spread spectrum modulation with the pseudo random sequence (PNi) allocated to the self. 5. A plurality of detection devices are installed in a guard area corresponding to one monitoring device, and at least call address information is sequentially transmitted from the monitoring devices to the plurality of detection devices. In a wireless abnormality monitoring equipment for transmitting status detection information to the monitoring device when an address is determined, the call address information is spread-spectrum modulated by the monitoring device with a pseudo-random sequence (PN ₁ ) for calling. And a call receiving unit for demodulating a state detection signal from a spread spectrum modulated signal returned from the detection device using a pseudo random sequence (PN ₂ ) for a response during a response period after the call. the parts provided wherein the plurality of sensing devices, using a pseudo-random sequence for the call from the transmitted spread spectrum modulation signal (PN ₁₎ from the monitoring device Call address information demodulated by the call receiver unit and said receiver unit for demodulating the call address information Te spread spectrum modulated by the pseudo-random sequence for the response to the state detection signal when a match to its own assigned address (PN ₂₎ Wireless abnormality monitoring equipment, characterized in that a response transmission section for transmitting the abnormality is provided. 6. In the wireless abnormality monitoring equipment according to claim 4 or 5, wherein, in said monitoring device further from the detection device at the time of abnormality detection is detecting the abnormality by transmitting a pseudo-random sequence for measurement A wireless abnormality monitoring facility comprising a distance measuring means for returning a signal at the same time as reception and measuring a distance to a detection device based on a propagation time from transmission to reception of the pseudo random sequence for measurement. 7. A wireless abnormality monitoring facilities of claims 1 to 6, wherein the sensing device is a fire sensor of a fire alarm system, said monitoring device is a repeater or a receiver of the fire alarm system, the Wireless abnormality monitoring equipment that outputs a fire alarm and controls disaster prevention equipment when a fire detection signal is received from a fire detector. 8. In the wireless abnormality monitoring equipment according to claim 1 to 7, wherein the sensing device comprises a battery power supply, wireless abnormality monitoring equipment, characterized by notifying monitoring information of the battery power supply.