JP2024021630A - Communications system - Google Patents

Abstract

To provide a communication system capable of transmitting jamming radio waves corresponding to radio waves with a wide bandwidth to wireless devices to be monitored.SOLUTION: A communication system includes a wideband receiver 40 that can receive radio waves with a wide bandwidth, including bands of multiple monitored radio waves, and output reception status data from the received monitored radio waves; a plurality of transmitting devices 60 that transmit radio waves for jamming to a radio device 10 that generates the received monitored radio waves; and a monitoring server 45 that inputs the reception status data from the wideband receiver 40, causes the plurality of transmitting devices 60 to transmit at different bands to make the radio waves for jamming against the radio device 10 wideband to match the bands of the radio waves generated by the radio device 10, and thereby controls spatial synthesis of the radio waves.SELECTED DRAWING: Figure 1

Description

The present invention relates to a communication system that interferes with radio waves of a wireless device to be monitored, and particularly relates to a communication system that realizes radio wave interference over a wide band.

[Conventional technology]
In conventional communication systems, a wireless device uses an amplifier to combine signal power to obtain an arbitrary output power, and then transmits the necessary signal power.
Furthermore, transmitting devices equipped with the function of interfering with communications are in practical use.
A transmitting device with a communication interference function monitors radio waves from a wireless device that is a source of wireless communication performed within a monitoring area, and generates interference radio waves, for example.

[Conventional first communication system: Figure 6]
Next, a first conventional communication system will be described with reference to FIG. 6. FIG. 6 is a schematic diagram of the configuration of a first conventional communication system.
As shown in FIG. 6, the conventional first communication system includes a plurality of wireless devices 10 for monitoring targets, a monitoring receiver 20, a transmitting device 30, and a monitoring server 24.

The monitoring receiver 20 in the first conventional communication system receives radio waves from known wireless devices 10a to 10d to be monitored and an unknown wireless device 10e (sometimes simply referred to as "wireless device 10"). , outputs information on the received radio waves to the monitoring server 24.
The monitoring server 24 estimates the frequency band, direction of arrival, position of the wireless device 10, etc. of the received radio waves based on the information of the received radio waves input from the monitoring receiver 20, and sends the signals to the transmitting device 30 toward the wireless device 10. It calculates the distance and range for jamming and controls the transmission of jamming waves.
The transmitting device 30 transmits jamming radio waves from the transmitting antenna 31 to the area where the wireless device 10 exists based on the control information from the monitoring server 24 .

In addition, in the first conventional communication system, in order to interfere with the communication of a plurality of wireless devices, the same number of transmitting devices 30 as the wireless devices 10 to be jammed are required, so the number of wireless devices 10 to be jammed is limited. However, it is inefficient, and it is not possible to realize a simple and low-cost configuration.

[Conventional second communication system: Figure 7]
Next, a second conventional communication system will be described with reference to FIG. 7. FIG. 7 is a schematic diagram of the configuration of a second conventional communication system.
As shown in FIG. 7, the conventional second communication system is almost the same as the conventional first communication system. 24 controls the transmitting antennas 31a and 31b to transmit different jamming waves.
In FIG. 7, the transmitting device 30 transmits different jamming waves to the wireless device 10a and the wireless device 10c.

In addition, the conventional second communication system solves the problems of the conventional first communication system, and uses a plurality of transmitting antennas 31a and 31b to transmit jamming radio waves to a plurality of radio devices 10a and 10c to be interfered with. It can be sent.
However, in the conventional second communication system, one transmitting device 30 outputs jamming waves alternately from a plurality of transmitting antennas 31a and 31b, so that jamming waves are transmitted to a plurality of wireless devices 10 at the same time. Therefore, it is not suitable to instantly interfere with each wireless device 10.

[Conventional transmitter: Figure 8]
Next, a conventional transmitting device will be explained with reference to FIG. FIG. 8 is a schematic diagram of the configuration of a conventional transmitting device.
As shown in FIG. 8, the conventional transmitter 30 includes an external interface section (external IF) 30a and jamming transmitting amplifiers 30b-1 to 30b-N. The interfering radio waves are transmitted from a single transmitting antenna 31 by combining the power from the two transmitting antennas.
Since the conventional transmitting device 30 implements the above configuration with a single device, it is large and heavy.

The jamming transmitting amplifier includes a variable attenuator (variable ATT) 301, a variable phase shifter 302, a local oscillator 303, a mixer 304, an amplifier 305, and a bandpass filter (BPF) 306, and uses a shared transmitting antenna. 31 outputs the power of the intended jamming radio wave.

[Related technology]
Incidentally, as a related prior art, there is Japanese Patent Application Publication No. 2002-232393 "Communication Method" (Patent Document 1).
Patent Document 1 discloses that an operation is performed to monitor the state of interference waves in the frequency band for data communication before data communication, the presence or absence of interference waves is memorized, and a frequency according to the result is used to detect interference waves. A communication method is shown that prevents a decrease in information communication speed by avoiding and canceling the avoidance.

Japanese Patent Application Publication No. 2002-232393

However, in the conventional first and second communication systems, interference radio waves of a specific frequency are transmitted based on the data collected by the monitoring receiving device, so the wireless device to be monitored does not transmit broadband radio waves. In the case of a radio wave, there was a problem in that it was not compatible with the broadband radio waves.

Note that Patent Document 1 does not describe a configuration for transmitting jamming radio waves in response to broadband radio waves to a wireless device to be monitored.

The present invention has been made in view of the above-mentioned circumstances, and it is an object of the present invention to provide a communication system capable of transmitting jamming radio waves corresponding to broadband radio waves to a wireless device to be monitored.

The present invention to solve the problems of the conventional example described above is a communication system that interferes with the radio waves of a monitoring target, and is capable of receiving wideband radio waves including the radio wave bands of a plurality of monitoring targets. A receiver that outputs reception status data from radio waves, multiple transmitters that transmit jamming radio waves to the wireless device that generates the received radio waves to be monitored, and inputs reception status data from the receiver. Then, control is performed to cause multiple transmitting devices to transmit in different bands so that radio waves for interfering with the wireless device are wideband in accordance with the band of radio waves generated by the wireless device, and to spatially synthesize the radio waves from the multiple transmitting devices. The invention is characterized by having a control device that performs the operation.

The present invention is characterized in that, in the above communication system, a plurality of receivers connected to the control device are used and installed in a plurality of areas.

The present invention is characterized in that the above communication system is characterized in that the control device performs control to change the band of radio waves transmitted from the plurality of transmitting devices in response to the change in the band of radio waves generated by the wireless device.

The present invention is characterized in that, in the above communication system, the control device divides into groups a plurality of transmitting devices that transmit jamming radio waves to a plurality of wireless devices.

The present invention is a communication system that interferes with the radio waves of a monitoring target, and is capable of receiving wideband radio waves including the radio wave bands of a plurality of monitoring targets, and that outputs reception status data from the received radio waves of the monitoring targets. a plurality of transmitting devices that respectively transmit jamming radio waves to each wireless device that generates received radio waves to be monitored; The present invention is characterized by comprising a control device that performs control to cause a plurality of corresponding transmitting devices to transmit interfering radio waves to each of the wireless devices in accordance with the band of radio waves generated by the device.

The present invention is characterized in that, in the above communication system, a plurality of receivers connected to the control device are used and installed in a plurality of areas.

The present invention is characterized in that the above communication system is characterized in that the control device performs control to change the band of radio waves transmitted from the plurality of transmitting devices in response to the change in the band of radio waves generated by the wireless device.

According to the present invention, the receiver is capable of receiving wideband radio waves including radio wave bands to be monitored, and outputs reception status data from the received radio waves to be monitored. The controller transmits jamming radio waves to the wireless device that generates the radio waves to be monitored. The communication system controls the spatial synthesis of the radio waves from multiple transmitters by having multiple transmitters transmit them in different bands so that the radio waves for interference are wideband. It has the effect of transmitting jamming radio waves corresponding to radio waves.

FIG. 1 is a schematic configuration diagram of a first communication system. FIG. 2 is a schematic configuration diagram of a second communication system. FIG. 3 is a schematic configuration diagram of a third communication system. FIG. 3 is a schematic configuration diagram of a fourth communication system. FIG. 1 is a schematic configuration diagram of the present transmitting device. FIG. 1 is a schematic configuration diagram of a first conventional communication system. FIG. 2 is a schematic configuration diagram of a second conventional communication system. FIG. 1 is a schematic configuration diagram of a conventional transmitting device.

Embodiments of the present invention will be described with reference to the drawings.
[Overview of embodiment]
A communication system according to an embodiment of the present invention (the present communication system) is capable of receiving wideband radio waves including a plurality of radio wave bands to be monitored, and is capable of receiving radio waves that output reception status data from the received radio waves to be monitored. the radio device, multiple transmitting devices that transmit jamming radio waves to the radio device that generates the received radio waves to be monitored, and receiving status data from the receiver, and It also has a monitoring server that performs control to cause a plurality of transmitting devices to transmit in different bands so that the radio waves for interfering with the wireless device are broadband, and to spatially synthesize the radio waves from the plurality of transmitting devices, It is capable of transmitting jamming radio waves compatible with wideband radio waves towards the wireless devices to be monitored.
Note that this communication system is realized by the following four embodiments.

[First communication system: Figure 1]
A first communication system in this communication system will be explained with reference to FIG. FIG. 1 is a schematic diagram of the configuration of a first communication system.
As shown in FIG. 1, the first communication system includes a wideband monitoring receiver (wideband receiver) 40, a monitoring server 45, a plurality of transmitting devices 60a to 60e, and a plurality of transmitting antennas 61a to 61e. have.
Transmitting antennas 61a-61e are connected to transmitting devices 60a-60e, respectively.
Although five transmitting devices 60a to 60e (sometimes simply referred to as "transmitting device 60") and five transmitting antennas 61a to 61e (sometimes simply referred to as "transmitting antenna 61") are shown in FIG. , the number is arbitrary.

In the first communication system, the interference radio waves generated from one transmitting device 30 in the conventional communication system are distributed to a plurality of devices to reduce the output level. However, the reduced output level is strengthened by spatially combining the interfering radio waves from the plurality of transmitting devices 60. The transmission spectrum waveform of the jamming radio wave is easier to form when the output level is lower.

[Broadband monitoring receiver 40]
The wideband monitoring receiver 40 is capable of receiving wideband radio waves, receives radio waves from known radio devices 10a to 10d, and also receives radio waves from an unknown radio device 10e, and monitors information on the received radio waves. Output to server 45.

[Monitoring server 45]
The monitoring server 45 estimates the frequency band, direction of arrival, location information of the wireless device 10, etc. of the received radio waves from the information on the received radio waves input from the wideband monitoring receiver 40, and transmits broadband jamming radio waves to the transmitting device 60. This is a control device that controls transmission. A method for forming broadband jamming waves will be described later.

Furthermore, when the monitoring server 45 determines from the information of the received radio waves from the wideband receiver 40 that the wireless device 10 to be monitored has changed the transmission frequency band, the monitoring server 45 causes the monitoring server 45 to follow the changed frequency band. The transmitting device 60 is controlled to shift the frequency band of the jamming radio wave and transmit the jamming radio wave.

[Transmitting device 60]
The plurality of transmitting devices 60 input control information for generating jamming waves from the monitoring server 45, and each transmitting device 60 modulates and generates jamming waves in different bands. The generation of the jamming waves to be transmitted is adjusted so that the amplitudes are the same and the phase difference is zero at the target point.

Incidentally, jamming radio waves in the same band may be generated, but although the band will not be wide, the jamming radio waves at the target point will overlap and the power will be a multiple of the number of transmitting devices 60.
Further, interference radio waves in different bands may partially overlap.
Further, the width of the wide band is determined by control information from the monitoring server 45, and the width of the wide band is not fixed, but can be changed depending on the condition of the radio waves to be monitored.

[Transmission antenna 61]
The plurality of transmitting antennas 61 output the transmission power output from the connected transmitting device 60 to the space of the monitoring target area.
In FIG. 1, all the transmitting antennas 61 simultaneously transmit jamming waves toward one wireless device 10a. If the interfering radio waves transmitted from each transmitting antenna 61 are of different bands, the spatially combined overall interfering radio waves will have a wide band.

The first communication system is characterized in that it includes a plurality of transmitting devices 60 and simultaneously transmits broadband jamming waves from a plurality of corresponding transmitting antennas 61 to a specific wireless device 10a (specific area).
Here, in order to realize the transmission of broadband jamming waves, the jamming waves in frequency band F1 are transmitted from a specific transmitting antenna 61a, and the frequency band F1-f (frequency f in frequency band F1) is transmitted from another transmitting antenna 61b. By simultaneously transmitting and spatially synthesizing jamming waves in the frequency band F1+f (frequency band F1 high frequency range) from another transmitting antenna 61c, a wide band (frequency band F1-f, F1 , F1+f).

[Second communication system: Figure 2]
The second communication system in this communication system will be explained with reference to FIG. 2. FIG. 2 is a schematic diagram of the configuration of the second communication system.
The second communication system is basically the same as the first communication system, as shown in FIG. However, in the second communication system, a plurality of transmitting devices 60 are grouped, and a plurality of transmitting antennas 61 in the group transmit jamming waves to a specific wireless device 10.

Specifically, in FIG. 2, transmitting antennas 61a, 61b, and 61c to which transmitting devices 60a, 60b, and 60c are connected are transmitting jamming radio waves to wireless device 10a, and transmitting antennas to which transmitting devices 60d and 60e are connected are transmitting jamming waves to wireless device 10a. Antennas 61d and 61e are transmitting jamming waves to wireless device 10c.
In the second communication system, although the effect of spatial synthesis is reduced, the transmission efficiency is improved because jamming waves can be transmitted to a plurality of wireless devices 10.

[Third communication system: Figure 3]
A third communication system in this communication system will be explained with reference to FIG. 3. FIG. 3 is a schematic diagram of the configuration of the third communication system.
As shown in FIG. 3, the third communication system has the same configuration as the first and second communication systems, but a plurality of transmitting devices 60 are assigned to individual wireless devices 10, and groups are made into minimum units. It transmits jamming radio waves.

Specifically, in FIG. 3, a transmitting antenna 61a connected to a transmitting device 60a transmits a jamming wave to the wireless device 10a, a transmitting antenna 61b connected to a transmitting device 60b transmits a jamming wave to the wireless device 10b, and the transmission A transmitting antenna 61c connected to the device 60c transmits jamming waves to the wireless device 10c, a transmitting antenna 61d connected to the transmitting device 60d transmits jamming waves to the wireless device 10d, and a transmitting antenna 61e connected to the transmitting device 60e transmits jamming waves to the wireless device 10c. Interfering radio waves are being transmitted to the device 10e.

However, the third communication system does not perform spatial synthesis and therefore does not support wideband. However, under the control of the monitoring server 45, the transmitting antennas 61 cooperate to provide fine-grained information to each individual wireless device 10. It is capable of transmitting jamming waves.

[Fourth communication system: Figure 4]
A fourth communication system in this communication system will be described with reference to FIG. 4. FIG. 4 is a schematic diagram of the configuration of the fourth communication system.
As shown in FIG. 4, the fourth communication system is based on the second communication system, and includes a plurality of installed receiving devices 70 arranged in a mesh pattern within a monitoring target area. The information on the radio waves of the wireless device 10 received at 70 is transmitted to the monitoring server 45 by wire or wirelessly, the radio wave status of the wireless device 10 in the monitored area is reported, and the monitoring server prevents the transmission of interference radio waves to the wireless device 10. 45 is in control.
Note that the fourth communication system may be based on the first and third communication systems instead of the second communication system.

Furthermore, in the fourth communication system, the transmitter 60 and the transmitter antenna 61 are mounted on a plurality of installed receivers 70 arranged in a mesh pattern, and the monitoring server 45 controls the transmitter 60 and the transmitter antenna 61 to transmit jamming radio waves from the installed locations. You may also do so.

[Transmitting device of this communication system: Figure 5]
The transmitting device (this transmitting device) of this communication system will be explained with reference to FIG. FIG. 5 is a schematic diagram of the configuration of this transmitting device.
As shown in FIG. 5, this transmitting device includes an external interface section (external IF) 60a and jamming transmitting amplifiers 60b-1 to 60b-N (referred to as jamming transmitting amplifiers 60b). Interfering radio waves are transmitted from the transmitting antennas 61a to 61N connected to each other by combining the power from the antennas 61a to 61N. Here, the directivity of the plurality of transmitting antennas 61 is controlled by the monitoring server 45.
Since each transmitting device 60 and the transmitting antenna 61 are arranged in the horizontal direction, excluding the external IF 60a in this transmitting device, the transmitting device 60 can be distributed and the size and weight can be reduced. be.

The interfering transmission amplifier 60b of this transmitting device includes a variable attenuator (variable ATT) 601 that controls the amplitude of the baseband signal, a variable phase shifter 602 that controls the phase, a local oscillator 603 for modulating the baseband signal, and a baseband signal. It has a mixer 604 that combines the signal and the oscillation signal of the local oscillator 603, an amplifier 605, and a bandpass filter (BPF) 606, and outputs the power of the target interfering radio wave to the individual transmitting antenna 61. .

Further, as an application example of the present communication system, it is possible to generate jamming radio waves to the radio waves of mobile phones near an ATM, thereby making it possible to deal with bank transfer fraud and the like.

[Effects of embodiment]
According to this communication system, the wideband receiver 40 is capable of receiving wideband radio waves including the bands of radio waves to be monitored, outputs reception status data from the received radio waves to be monitored, and transmits data to the plurality of transmitting devices. 60 transmits jamming radio waves to the wireless device 10 that generates the received radio waves to be monitored, the monitoring server 45 inputs reception status data from the wideband receiver 40, and the wireless device 10 generates the received radio waves. Control is performed to cause multiple transmitting devices 60 and transmitting antennas 61 to transmit in different bands so that the radio waves for interfering with the wireless device 10 are wideband in accordance with the radio wave band, and to spatially synthesize the radio waves from the multiple transmitting antennas 61. This has the effect of transmitting jamming radio waves corresponding to broadband radio waves toward the wireless device 10 to be monitored.

INDUSTRIAL APPLICATION This invention is suitable for the communication system which can transmit the interference radio wave corresponding to a broadband radio wave to the wireless device of monitoring object.

DESCRIPTION OF SYMBOLS 10... Wireless device, 20... Monitoring receiver, 24... Monitoring server, 30... Transmitting device, 31... Transmitting antenna, 40... Broadband receiver, 45... Monitoring server, 60... Transmitting device, 61... Transmitting antenna, 70... Installation type receiving device, 30a, 60a... External interface section, 30b, 60b... Jamming transmission amplifier, 301, 601... Variable ATT, 302, 602... Variable phase shifter, 303, 603... Local oscillator, 304, 604... Mixer, 305,605...Amplifier, 306,606...BPF

Claims (7)

A communication system that interferes with the radio waves of a monitored target,
a receiver capable of receiving wideband radio waves including multiple radio wave bands to be monitored, and outputting reception status data from the received radio waves to be monitored;
a plurality of transmitting devices that transmit interference radio waves to the wireless device that generates the received radio waves to be monitored;
inputting reception status data from the receiver, causing the plurality of transmitting devices to transmit in different bands so that radio waves for interfering with the wireless device are wideband in accordance with the band of radio waves generated by the wireless device; A communication system comprising: a control device that performs control to spatially synthesize radio waves from a plurality of transmitting devices. 2. The communication system according to claim 1, wherein a plurality of receivers connected to the control device are used and installed in a plurality of areas. The communication system according to claim 1 or 2, wherein the control device performs control to change the band of radio waves transmitted from the plurality of transmitting devices in response to a change in the band of radio waves generated by the wireless device. . 3. The communication system according to claim 1, wherein the control device divides into groups a plurality of transmitting devices that transmit interference radio waves to a plurality of wireless devices. A communication system that interferes with the radio waves of a monitored target,
a receiver capable of receiving wideband radio waves including multiple radio wave bands to be monitored, and outputting reception status data from the received radio waves to be monitored;
a plurality of transmitting devices that respectively transmit jamming radio waves to each wireless device that generates the received radio waves to be monitored;
Control is performed by inputting reception status data from the receiver and causing the plurality of corresponding transmitting devices to transmit jamming radio waves to each of the radio devices in accordance with the band of radio waves generated by each of the radio devices. A communication system comprising a control device that performs the following operations. 6. The communication system according to claim 5, wherein a plurality of receivers connected to the control device are used and installed in a plurality of areas. The communication system according to claim 5 or 6, wherein the control device performs control to change the band of radio waves transmitted from the plurality of transmitting devices in response to a change in the band of radio waves generated by the wireless device. .