WO-2026095124-A1 - DETECTOR FOR DETECTING WIRETAPPING DEVICE TRANSMITTING ILLEGALLY COLLECTED INFORMATION AND DETECTION METHOD THEREFOR

WO2026095124A1WO 2026095124 A1WO2026095124 A1WO 2026095124A1WO-2026095124-A1

Abstract

Disclosed are a detector for detecting a wiretapping device transmitting illegally collected information and a detection method therefor. The wiretapping detector of the present invention measures its own location within a surveillance area using ultrasonic waves and searches for wiretapping signals at a plurality of locations, thereby being capable of detecting the position of a wiretapping device by means of triangulation.

Inventors

JANG, Chang Nam
LEE, San Gu

Assignees

주식회사 케이앤어스

Dates

Publication Date: 20260507
Application Date: 20241031

Claims (12)

In a wiretapping detection system for detecting the location of a wiretapping device, A reflective column positioned at a designated location within a surveillance area and having a horizontal cross-section that is a convex polygon; An eavesdropping detector positioned at the nth detection position facing the nth surface of the above-mentioned reflector column to measure the signal strength of an eavesdropping signal and to measure the Time of Flight (TOF) of receiving a reflected wave by outputting ultrasound toward the nth surface, wherein the signal strength of the eavesdropping signal and the ultrasonic Time of Flight are measured at multiple detection positions while varying n. n is a positive integer; and It includes a control server that calculates the location of the eavesdropping device on the virtual floor plan of the surveillance area by calculating the plurality of detection locations and calculating the distance from the plurality of detection locations to the eavesdropping device. The above-described control server calculates the detection position using the distance calculated using the flight time based on the position of the reflector column on the above-described virtual plan and the angle of the above-described nth surface, and calculates the distance from the detection position to the above-described eavesdropping device using the above-described signal strength.
In paragraph 1, The above control server is, A wiretapping detection system characterized by determining the location of the wiretapping device by determining the intersection point within the monitoring area as the location of the wiretapping device when, at a first circle with a radius R1, the distance from a first point within the monitoring area to the wiretapping device, and at a second circle with a radius R2, the distance from a second point to the wiretapping device, one of the two intersection points of the first circle and the second circle is located outside the monitoring area and the other is located inside the monitoring area.
In paragraph 1, An eavesdropping detection system characterized in that the above-mentioned reflector column is a column having a horizontal cross-section of an equilateral triangle, and a material for reflecting the above-mentioned ultrasound is attached or coated on its outer surface.
In paragraph 1, The above-mentioned eavesdropping detector is, An eavesdropping detection system characterized by measuring the flight time when the intensity of the reflected wave received after emitting ultrasound toward the nth surface is greater than or equal to a preset threshold.
In paragraph 1, The above-mentioned eavesdropping detector is, It further includes an input unit for receiving the identification number of the nth surface among the plurality of surfaces of the above-mentioned reflector column, and An eavesdropping detection system characterized by the above-mentioned control server verifying the angle information of the nth side stored in memory using the above-mentioned identification number.
In paragraph 1, The above-mentioned eavesdropping detector is It further includes a display unit that displays a virtual floor plan of the above-mentioned surveillance area on a screen, and A wiretapping detection system characterized by receiving a floor plan showing the location of the wiretapping device from the control server and displaying it on the display unit.
In a method for detecting eavesdropping devices, A step of placing an eavesdropping detector at a detection position facing the nth face of a reflector column installed at a designated location within a surveillance area, wherein the horizontal cross-section of the reflector column is a convex polygon and n is a positive integer; A measurement step in which the eavesdropping detector detects an eavesdropping signal at the above detection location and measures the signal strength, and outputs ultrasound toward the nth surface to measure the Time of Flight (TOF) of receiving the reflected wave; A calculation step in which a control server calculates the detection position using the distance calculated using the flight time and the angle of the nth surface based on the position of the reflector column on the virtual plan of the surveillance area, and calculates the distance from the detection position to the eavesdropping device using the signal strength; and A detection method characterized by including a step of calculating the distance from a plurality of detection locations to the eavesdropping device by repeating the measurement and calculation steps while changing the above n, and the control server calculating the location of the eavesdropping device in the virtual plan using triangulation.
In Paragraph 7, In the step of calculating the location of the above-mentioned eavesdropping device, A detection method characterized by determining the location of the eavesdropping device by determining the intersection point within the surveillance area as the location of the eavesdropping device when, at a first point within the surveillance area, a first circle with a radius R1, the distance from the first point to the eavesdropping device, and at a second point with a radius R2, the distance from the second point to the eavesdropping device, one of the two intersection points of the first circle and the second circle is located outside the surveillance area and the other is located inside the surveillance area.
In Paragraph 7, A detection method characterized in that the above-mentioned reflector column is a column having a horizontal cross-section of an equilateral triangle, and a material for reflecting the above-mentioned ultrasound is attached or coated on its outer surface.
In Paragraph 7, In the above measurement step, A detection method characterized by the above-described eavesdropping detector measuring the flight time when the intensity of the received reflected wave is greater than or equal to a preset threshold after emitting ultrasonic waves toward the nth surface.
In Paragraph 7, The angle of the nth surface above The above-mentioned eavesdropping detector receives the identification number of the nth side through the input unit and provides it to the control server, and A detection method characterized by the above-mentioned control server verifying the angle information of the nth surface stored in memory using the above-mentioned identification number.
In Paragraph 7, A detection method characterized by further including the step of the control server providing the eavesdropping detector with a plan showing the location of the eavesdropping device calculated by triangulation, and the eavesdropping detector displaying the plan showing the location of the eavesdropping device on a display unit.

Description

Detector for detecting an eavesdropping device transmitting illegally collected information and the detection method thereof The present invention relates to a detector capable of tracking not only an eavesdropping signal transmitting illegally collected information but also the location of the eavesdropping device, and a detection method thereof. Eavesdropping and hidden cameras involve secretly listening to and watching, and with the advancement of technology, they are becoming increasingly miniaturized and high-performance, with various methods available. Advanced eavesdropping methods include techniques that use infrared lasers to measure changes in sound waves, as well as methods that detect electromagnetic waves emitted by computers to remotely reproduce the screen images of the target computer. The most common and widely used eavesdropping devices or hidden cameras conceal the device in a specific space to record conversations or secretly film videos, then transmit them to an external device via wireless signals. Conventional eavesdropping detectors are devices that detect wireless signals, collecting signals used for eavesdropping using an antenna. For example, an eavesdropping detector detects wireless signals with a signal strength exceeding a preset threshold in specific frequency bands primarily used by eavesdropping devices. When a signal appearing to be an eavesdropping signal is collected, a relevant expert analyzes the spectrum of the collected wireless signal to determine whether it is an eavesdropping signal containing voice or video, or a signal from a hidden camera, thereby making a final determination of whether eavesdropping has occurred. When an eavesdropping signal is detected, the eavesdropping device must be located. Eavesdropping devices are typically concealed and hidden within the building's interior walls or furniture structures such as desks and chairs. Therefore, traditionally, managers would walk around the surveillance area carrying a portable wireless signal detector (more precisely, an antenna connected to the detector) to search for wireless signals suspected of being eavesdropping, looking for the location with the strongest signal strength. Finally, they would visually search the area around where the wireless signal exceeds a certain strength to locate the device. Because this method is time-consuming, if the device stops transmitting a wireless signal during the search, one must wait until it resumes transmission. Moreover, an additional portable device is required for wireless signal detection, and searching a considerably large area takes a significant amount of time. FIG. 1 is a block diagram of an eavesdropping detection system according to one embodiment of the present invention, FIG. 2 is a block diagram of the eavesdropping detector of the present invention, FIG. 3 is a drawing illustrating an example of a virtual plan view of a surveillance area according to the present invention, and FIG. 4 is a flowchart provided for explaining the method for detecting an eavesdropping device according to the present invention. The present invention will be described in more detail below with reference to the drawings. Referring to FIG. 1, the eavesdropping detection system (100) of the present invention can detect an eavesdropping device (10) that illegally obtains information while hidden within a surveillance area. Here, the eavesdropping device (10) may use various eavesdropping methods, but it is a device that transmits eavesdropped information to an external device using a wireless communication signal. A hidden camera that transmits illegally filmed video to an external device using a wireless communication signal also corresponds to the eavesdropping device (10) of the present invention. Hereinafter, the wireless communication signal transmitted by the eavesdropping device (10) to an external device is referred to as an "eavesdropping signal." The eavesdropping detection system (100) includes a reflector column (110), an eavesdropping detector (130), and a control server (150). Multiple eavesdropping detectors (130) may be connected to the control server (150) via wired or wireless communication. The reflector column (110) is a column to which a material capable of totally reflecting the ultrasonic waves emitted by the eavesdropping detector (130) is attached or coated on all or part of its outer surface, and is positioned vertically at a point within the surveillance area. The reflector column (110) may be fixedly installed at a designated location within the surveillance area, but may also be positioned whenever necessary. Based on the vertical arrangement, the reflector column (110) is a column in which the horizontally cut cross-sectional shape is a convex polygon. It is preferable that the interior angles of the horizontal cross-section of the reflector column (110) are all of the same size, but it is not necessary. For example, the reflector column (110) may b