# US 12,222,425 B2 · Apparatus and method for blocking navigation satellite signal reception with respect to illegal unmanned aerial vehicles > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 12,222,425 B2 - Document ID: US12222425B2 - Status: Granted - Kind: B2 - Application number: 18/718,928 - Filed: 2022-12-14 - Published: 2024-12-19 - Granted: 2025-02-11 - Earliest claimed: 2022-01-21 - Assignees: Agency for Defense Development - Applicants: Agency for Defense Development - Inventors: Jun O Kim; Youngjoong Lee - Web page: https://patentgrep.com/patent/US12222425B2 ## CPC - G01S 19/015: {Arrangements for jamming, spoofing or other methods of denial of service of such systems} - G01S 19/21: Interference related issues {; Issues related to cross-correlation, spoofing or other methods of denial of service} - G01S 13/66: Radar-tracking systems; Analogous systems - G01S 19/01: Satellite radio beacon positioning systems transmitting time-stamped messages, e.g. GPS [Global Positioning System], GLONASS [Global Orbiting Navigation Satellite System] or GALILEO - G01S 19/215: {issues related to spoofing} - H01Q 1/28: Adaptation for use in or on aircraft, missiles, satellites, or balloons - H01Q 21/06: Arrays of individually energised antenna units similarly polarised and spaced apart - G01S: RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES - H01Q: ANTENNAS, i.e. RADIO AERIALS (radiators or antennas for microwave heating H05B6/72) ## Abstract An apparatus for intercepting navigation satellite signal reception to an illegal unmanned aerial vehicle includes a navigation satellite position identification unit configured to identify a position of a navigation satellite, a plurality of radio wave interference sources distributively arranged, and a radio wave interference source selection unit configured to selectively activate, from among the plurality of radio wave interference sources, a radio wave interference source at a position symmetric to the navigation satellite based on a current position or flight trajectory of an illegal unmanned aerial vehicle to cause an interference signal to emit, wherein the interference signal causes the illegal unmanned aerial vehicle to generate symmetric interference in a direction of the navigation satellite. ## Claims ### Claim 1 An apparatus for intercepting navigation satellite signal reception to an illegal unmanned aerial vehicle, the apparatus comprising: a plurality of radio wave interference sources distributively arranged; and one or more processors configured to: identify a position of a navigation satellite, and selectively activate, from among the plurality of radio wave interference sources, a radio wave interference source at a position symmetric to the navigation satellite based on a current position or flight trajectory of an illegal unmanned aerial vehicle to cause an interference signal to emit, wherein the interference signal causes the illegal unmanned aerial vehicle to generate symmetric interference in a direction of the navigation satellite. ### Claim 2 (depends on 1) The apparatus of claim 1, wherein the one or more processors are further configured to receive current position information comprising an elevation angle and an azimuth angle of the illegal unmanned aerial vehicle from a radar or optical observation camera, to track the current position of the illegal unmanned aerial vehicle, and to predict the flight trajectory. ### Claim 3 (depends on 1) The apparatus of claim 1, wherein: the plurality of radio wave interference sources are distributively arranged around a major facility that does not allow access of the illegal unmanned aerial vehicle around thereof. ### Claim 4 (depends on 1) The apparatus of claim 1, wherein: the illegal unmanned aerial vehicle comprises an antenna platform on which a multi-element array antenna is arranged. ### Claim 5 (depends on 4) The apparatus of claim 4, wherein: the interference signal is a real null signal, and the symmetric interference is a symmetric null signal caused in a process of canceling the interference signal by an interference processing function of a multi-element array antenna system of the illegal unmanned aerial vehicle. ### Claim 6 (depends on 4) The apparatus of claim 4, wherein: an elevation angle of the interference signal and an elevation angle of the symmetric interference have the same value and are symmetric with respect to an antenna plane of the antenna platform. ### Claim 7 (depends on 4) The apparatus of claim 4, wherein: the symmetric interference results in intercepting reception of a navigation satellite signal present in a zone comprising a symmetric point area of emission origins of the radio wave interference sources based on an antenna plane of the antenna platform. ### Claim 8 (depends on 1) The apparatus of claim 1, wherein: the one or more processors are further configured to: identify positions of a plurality of satellites; and selectively exclude the navigation satellite from the illegal unmanned aerial vehicle from among the plurality of navigation satellites. ### Claim 9 (depends on 1) The apparatus of claim 1, wherein: the one or more processors are further configured to activate n radio wave interference sources to exclude n navigation satellites from which the illegal unmanned aerial vehicle is receiving signals, leading to navigation cessation of the illegal unmanned aerial vehicle. ### Claim 10 A method for intercepting navigation satellite signal reception to an illegal unmanned aerial vehicle by selectively activating a plurality of radio wave interference sources distributively arranged, the method comprising: selecting, from among the plurality of radio wave interference sources, a radio wave interference source symmetric to a navigation satellite based on a current position or flight trajectory of the illegal unmanned aerial vehicle; and activating the radio wave interference source to cause an interference signal to be emitted in a direction in which symmetric interference is generated in a direction of the navigation satellite. ### Claim 11 (depends on 10) The method of claim 10, further comprising, receiving current position information comprising an elevation angle and an azimuth angle of the illegal unmanned aerial vehicle from a radar or optical observation camera, tracking the current position of the illegal unmanned aerial vehicle, and predicting the flight trajectory. ### Claim 12 (depends on 10) The method of claim 10, wherein: the plurality of radio wave interference sources are distributively arranged around a major facility that does not allow access of the illegal unmanned aerial vehicle around thereof. ### Claim 13 (depends on 10) The method of claim 10, wherein: the illegal unmanned aerial vehicle comprises an antenna platform on which multi-element array antennas are arrayed. ### Claim 14 (depends on 13) The method of claim 13, wherein: the interference signal is an actual null signal, and the symmetric interference is a symmetric null signal caused in a process of canceling the interference signal by an interference processing function of a multi-element array antenna system of the illegal unmanned aerial vehicle. ### Claim 15 (depends on 13) The method of claim 13, wherein: an elevation angle of the interference signal and an elevation angle of the symmetric interference have the same value and are symmetric with respect to an antenna plane of the antenna platform. ### Claim 16 (depends on 13) The method of claim 13, wherein: the symmetric interference results in intercepting reception of a navigation satellite signal present in a zone including a symmetric point area of an emission origin of the radio wave interference source based on an antenna plane of the antenna platform. ### Claim 17 (depends on 10) The method of claim 10, further comprising: identifying positions of a plurality of navigation satellites; and selectively excluding the navigation satellite from the illegal unmanned aerial vehicle from among the plurality of navigation satellites. ### Claim 18 (depends on 10) The method of claim 10, further comprising activating n radio wave interference sources to exclude n navigation satellites from which the illegal unmanned aerial vehicle is receiving signals, thereby causing navigation cessation of the illegal unmanned aerial vehicle.