A system and method for detecting and countering unmanned aerial vehicles in urban environments

Abstract

The present invention relates to a system and method for detecting and countering unmanned aerial vehicles in an urban environment. The system includes a radio detection and interference device, an optoelectronic search and tracking device, and a display and control device; the radio detection and interference device is used to detect unmanned aerial vehicles, and after detecting the unmanned aerial vehicle, a first alarm message is sent to the display and control device, and an interference signal is transmitted in response to an interference control instruction issued by the display and control device; the optoelectronic search and tracking device is used to detect unmanned aerial vehicles, and tracks unmanned aerial vehicles in response to a tracking control instruction issued by the display and control device, and after detecting or tracking the unmanned aerial vehicle, a second alarm message is sent to the display and control device; the display and control device is used to generate a tracking control instruction according to the orientation information of the unmanned aerial vehicle, identify and verify the target according to the image information of the unmanned aerial vehicle, and generate an interference control instruction according to the communication frequency band information and position information of the target unmanned aerial vehicle. In the daily early warning process of the system, there is no need to actively radiate electromagnetic waves for detection, the power consumption is low, and the target can be verified.

Description

Technical Field

[0001] The present invention relates to the technical field of unmanned aerial vehicles, and in particular to a detection and countermeasure system and method for unmanned aerial vehicles in an urban environment. Background Art

[0002] As drone technology continues to develop and improve, the civilian commercial small drone market is gradually expanding, more and more people can obtain drones, and the difficulty of operating drones is getting lower and lower. At present, the laws and regulations on drone flight management are still imperfect, there is a large gap in its supervision, and the drone production industry has not formed a unified standard, resulting in most drone flights There are safety hazards, and at the same time, it provides opportunities for criminals.

[0003] In the existing technology, radar detection mode is often used for aerial targets. In urban environments, the electromagnetic environment is complex, the terrain is complex, and the population density is high. Detecting drones through radar may interfere with the surrounding electromagnetic field and affect the daily life of residents. Summary of the invention

[0004] The purpose of the present invention is to address at least some of the above-mentioned shortcomings and to provide a drone detection and countermeasure system and method that does not require active outward radiation of electromagnetic waves for detection during daily early warning.

[0005] In order to achieve the above-mentioned object, the present invention provides a UAV detection and countermeasure system for urban environments, the system comprising: a radio detection and jamming device, an optoelectronic search and tracking device, and a display and control device;

[0006] The radio detection and interference device is used to detect UAVs, send a first alarm message to the display and control device after detecting the UAV, and transmit a corresponding interference signal to interfere with the communication frequency band of the target UAV in response to the interference control command issued by the display and control device; wherein the first alarm message at least includes the position information and communication frequency band information of the UAV;

[0007] The optoelectronic search and tracking device is used to detect the UAV, track the UAV in response to the tracking control instruction issued by the display and control device, and send a second alarm message to the display and control device after detecting or tracking the UAV; wherein the second alarm message includes at least the location information and image information of the UAV;

[0008] The display and control device is used to generate corresponding tracking control instructions according to the orientation information of the UAV after receiving the first alarm information and send them to the optoelectronic search and tracking device, perform target identification and verification according to the image information of the UAV after receiving the second alarm information, and after verifying and confirming that the target UAV is identified, generate corresponding interference control instructions according to the communication frequency band information and position information of the target UAV and send them to the radio detection and interference device, and / or generate a corresponding alarm report and report it to the user.

[0009] Optionally, the optoelectronic search and tracking device includes a turntable, a communication processing board and an infrared detector; the turntable is used to carry the infrared detector, and the communication processing board is used to realize information interaction within the optoelectronic search and tracking device.

[0010] Optionally, the optoelectronic search and tracking device also includes a visible light camera, which is arranged on the turntable.

[0011] Optionally, the radio detection interference device includes a detection antenna, an interference antenna, a receiving channel unit, an antenna power amplifier unit and a signal processing unit;

[0012] The detection antenna is used to receive radio signals to detect drones, and to send echo data to the signal processing unit through the receiving channel unit;

[0013] The signal processing unit is used to process based on the echo data to determine the orientation information and communication frequency band information of the UAV, and to process based on the interference control instruction issued by the display and control device to determine the frequency band and power of the interference signal, and send corresponding instructions to the antenna power amplifier unit;

[0014] The antenna power amplifier unit is used to generate a corresponding interference signal in response to an instruction issued by the signal processing unit, and transmit the interference signal through the interference antenna.

[0015] Optionally, the antenna power amplifier unit generates a corresponding interference signal, including:

[0016] Cover the communication frequency band of the target drone and generate a broadband jamming signal.

[0017] Optionally, the urban environment drone detection and countermeasure system further comprises: a network connection device;

[0018] The display and control device is connected to the radio detection and interference device and the optoelectronic search and tracking device through the network connection device.

[0019] Optionally, the urban environment drone detection and countermeasure system further includes: a server;

[0020] The server is connected to the radio detection and jamming device and the optoelectronic search and tracking device through the network connection device.

[0021] Optionally, the network connection device is connected to the radio detection and jamming device and the optoelectronic search and tracking device through optical fiber, and signal conversion is performed through an optical fiber transceiver.

[0022] The present invention also provides a method for detecting and countering unmanned aerial vehicles in an urban environment. The method is implemented by using any of the above-mentioned unmanned aerial vehicle detection and countering systems, and comprises the following steps:

[0023] S1. Detect UAVs through radio detection jammers and optoelectronic search and tracking equipment;

[0024] S2. If the radio detection and jamming device detects a UAV, then execute step S3; if the photoelectric search and tracking device detects a UAV, then execute step S4 directly;

[0025] S3, generating corresponding tracking control instructions according to the position information of the UAV obtained by the radio detection and jamming device, and sending the instructions to the optoelectronic search and tracking device to guide the optoelectronic search and tracking device to track the corresponding UAV;

[0026] S4, performing target recognition and verification according to the image information of the UAV obtained by the optoelectronic search and tracking device, and determining whether the current UAV is the target UAV, if so, executing step S5, otherwise returning to step S1;

[0027] S5. Generate and transmit corresponding interference signals according to the communication frequency band information and location information of the target UAV to interfere with the communication frequency band of the target UAV.

[0028] Optionally, in step S5, generating and transmitting a corresponding interference signal includes:

[0029] With respect to the communication frequency band of the target UAV, a broadband interference signal covering the communication frequency band of the target UAV is generated and transmitted.

[0030] The above-mentioned technical scheme of the present invention has the following advantages: the present invention provides a system and method for detecting and countering unmanned aerial vehicles in an urban environment. The present invention adopts photoelectric detection technology combined with radio technology. The photoelectric search and tracking equipment can search for targets by itself and can also accept the guidance of radio warnings. There is no active electromagnetic radiation to the outside during the warning detection stage, and there is no impact on surrounding residents and surrounding communications. The target can be verified based on the image information obtained by the photoelectric search and tracking equipment. The detection accuracy is high and false alarm incidents are not prone to occur. At the same time, the present invention uses electromagnetic interference to deal with the target unmanned aerial vehicle, which is not likely to cause the unmanned aerial vehicle to crash, reducing the probability of secondary damage. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 This is a structural block diagram of a UAV detection and countermeasure system for an urban environment according to an embodiment of the present invention;

[0032] Figure 2 It is a schematic diagram of the steps of a method for detecting and countering drones in an urban environment according to an embodiment of the present invention. DETAILED DESCRIPTION

[0033] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0034] like Figure 1 As shown, an embodiment of the present invention provides an urban environment drone detection and countermeasure system, including a radio detection and jamming device, an optoelectronic search and tracking device, and a display and control device. Specifically, wherein:

[0035] The radio detection interference equipment is used to detect drones. After detecting the drone, it sends a first alarm message to the display and control device, and, in response to the interference control command issued by the display and control device, it transmits a corresponding interference signal to interfere with the communication frequency band of the target drone; wherein the first alarm message includes at least the direction information and communication frequency band information of the drone.

[0036] The optoelectronic search and tracking device is used to detect drones, track the corresponding drones in response to the tracking control instructions issued by the display and control device, and send a second alarm message to the display and control device after detecting or tracking the drone; wherein the second alarm message includes at least the location information and image information of the drone.

[0037] The display and control device is used to generate corresponding tracking control instructions and send them to the optoelectronic search and tracking device according to the acquired position information of the drone after receiving the first alarm information, and to perform target identification and verification according to the acquired image information of the drone after receiving the second alarm information, and to generate corresponding interference control instructions and send them to the radio detection and interference device according to the communication frequency band information and position information of the target drone after verifying and identifying the target drone, and / or to generate corresponding alarm reports and report them to the user. Among them, the position information of the target drone comes from the optoelectronic search and tracking device, and the optoelectronic search and tracking device can determine the distance between the target and the optoelectronic search and tracking device through the laser ranging unit; the communication frequency band information of the target drone can come from the radio detection and interference device, and can also be further combined with the drone communication frequency band disclosed in the prior art. By reporting the corresponding alarm report, the user can also choose manual operation based on the alarm report to counter the target drone.

[0038] Radio detection technology detects, searches, and intercepts radio signals in the airspace, analyzes and identifies the radio signals, obtains corresponding technical parameters, working characteristics, radiation position and other data to identify and track drones, obtain information such as the azimuth, pitch angle and communication frequency band of the drone, has early warning capability, and has a fast search speed, but there are problems of false alarms and inability to detect atypical frequency bands; photoelectric detection technology does not have early warning capability, but after detecting the target, it can determine the specific position of the target by laser ranging and obtain the image information of the target. The urban environment drone detection and countermeasure system provided by the present invention adopts a combination of radio detection and photoelectric detection, uses the early warning capability of radio detection technology to monitor the airspace, and can usually quickly find the target. Based on the azimuth and pitch angle determined by radio detection, the photoelectric detection and tracking corresponding target are guided. At the same time, the photoelectric search and tracking device can also search and track the target separately, and obtain the corresponding image information after tracking the target. The present invention verifies the target based on the image information, determines whether the currently discovered drone is the target drone that needs to be countered, and can reduce false alarm events, improve detection accuracy, and improve system work efficiency and countermeasure effect.

[0039] Preferably, if Figure 1 As shown in the figure, the optoelectronic search and tracking equipment includes a turntable, a communication processing board and an infrared detector. Among them, the turntable is used to carry the infrared detector. Through the high-speed rotation of the turntable and the image stitching technology, it can realize all-round monitoring of the surrounding 360° airspace, and the turntable can provide high-precision azimuth and pitch data. The communication processing board is used to realize the information interaction within the optoelectronic search and tracking equipment. The infrared detector can realize day and night monitoring, and the acquired infrared image information can be used for target identification. Through the image processing algorithm, the point target on the infrared image can be locked, and the target can be stably tracked with the turntable.

[0040] Furthermore, the optoelectronic search and tracking device also includes a visible light camera, which is also arranged on the turntable. Visible light images are obtained by the visible light camera, and a large range of airspace can be observed by using the visible light image. At the same time, in a stable tracking state, the target can be magnified by a variable multiple so that the user can observe and confirm.

[0041] Preferably, if Figure 1 As shown, the radio detection interference device includes a detection antenna, an interference antenna, a receiving channel unit, an antenna power amplifier unit and a signal processing unit. Specifically, wherein:

[0042] The detection antenna is used to receive radio signals to detect the UAV, and to send detected echo data to the signal processing unit through the receiving channel unit;

[0043] The signal processing unit is used to process based on the echo data to determine the orientation information and communication frequency band information of the UAV, and to process based on the interference control instructions issued by the display and control device to determine the frequency band and power of the interference signal, and send corresponding instructions to the antenna power amplifier unit;

[0044] The antenna power amplifier unit is used to respond to the instructions issued by the signal processing unit, generate corresponding interference signals, and transmit them through the interference antenna to interfere with the communication frequency band of the target drone.

[0045] In radio detection and jamming equipment, the detection antenna and jamming antenna are used to receive and send electromagnetic signals respectively.

[0046] Furthermore, the antenna system can be composed of an eight-log periodic antenna array, which operates at 0.4GHz to 6GHz. It uses eight antenna array elements to sense the same radio electromagnetic wave signal in space into wired electrical signals of different amplitudes and phases. At the same time, the detection angle can be adjusted according to the antenna array elements.

[0047] Furthermore, the receiving channel unit may include two parts: a switch array and an analog down-conversion. The switch array mainly realizes the switching function of the direction-finding antenna and the self-calibration signal. The analog down-conversion performs frequency conversion processing on the input 0.3GHz~3.5GHz RF signal to output 5 140MHz intermediate frequency signals, mainly including functions such as frequency conversion, amplification, gain control, and signal bandwidth filtering. The signal processing unit has two built-in SOM boards to drive the antenna to receive 70M~6GHZ radio signals. After the received electrical signal is amplified by the LNA, the built-in algorithm performs protocol cracking and intelligent analysis on the electrical signal to realize the radio detection function.

[0048] Furthermore, the antenna power amplifier unit generates a corresponding interference signal, including:

[0049] Cover the communication frequency band of the target drone and generate a broadband jamming signal.

[0050] The broadband interference signal covers the entire drone communication frequency band, thereby achieving countermeasures. Generally, typical drone communication frequency bands are 2400-2480MHz, 5725-5850MHz, and can also be set according to the communication frequency band information in the first alarm information.

[0051] Taking into account the detection needs of urban environments, radio detection and jamming equipment and optoelectronic search and tracking equipment are preferably deployed at commanding heights in the city. To facilitate operation and management, the urban environment drone detection and countermeasure system further includes a network connection device, and the display and control device is connected to both the radio detection and jamming equipment and the optoelectronic search and tracking equipment through the network connection device. In this way, the radio detection and jamming equipment and the optoelectronic search and tracking equipment can be deployed at the desired location as front-end equipment, and the display and control equipment can be remotely controlled through the network connection device, such as receiving alarm information and image information sent by the front-end equipment, and controlling the front-end equipment according to the user's choice. The use of network connection equipment is conducive to the rapid exchange of large amounts of data.

[0052] Preferably, the urban environment drone detection and countermeasure system further includes a server; the server is connected to both the radio detection jamming device and the optoelectronic search and tracking device via a network connection device. Through the server, in addition to the user who controls the display and control device, other users can also obtain the detection information of the radio detection jamming device and the optoelectronic search and tracking device on the target, thereby realizing information sharing.

[0053] Furthermore, optical fiber is used to connect the network connection device to the radio detection and jamming device, and to connect the network connection device to the optoelectronic search and tracking device, and optical fiber transceivers are used for signal conversion. Considering that in an urban environment, there is a long distance between the front-end device and the back-end device (display and control device, server), the use of optical fiber and optical fiber transceivers is conducive to signal transmission.

[0054] like Figure 2 As shown, the present invention also provides a method for detecting and countering unmanned aerial vehicles in an urban environment. The method is implemented by the unmanned aerial vehicle detection and countering system in an urban environment as described in any of the above embodiments, and specifically comprises the following steps:

[0055] S1. Detect UAVs through radio detection jammers and optoelectronic search and tracking equipment;

[0056] S2. If the radio detection and jamming device detects a UAV, then execute step S3. If the photoelectric search and tracking device detects a UAV, then execute step S4 directly without executing step S3.

[0057] S3. Generate corresponding tracking control instructions according to the position information of the UAV obtained by the radio detection and jamming equipment, and send them to the optoelectronic search and tracking equipment to guide the optoelectronic search and tracking equipment to track the corresponding UAV so as to obtain the position information and image information of the UAV;

[0058] S4, perform target recognition and verification based on the image information of the drone obtained by the optoelectronic search and tracking device to determine whether the current drone is the target drone. If so, execute step S5, otherwise return to step S1 to continue detecting other drones;

[0059] S5. Generate and transmit corresponding interference signals according to the communication frequency band information and location information of the target UAV to interfere with the communication frequency band of the target UAV.

[0060] Preferably, in step S5, generating and transmitting a corresponding interference signal includes:

[0061] With respect to the communication frequency band of the target UAV, a broadband interference signal covering the communication frequency band of the target UAV is generated and transmitted.

[0062] In summary, the present invention provides a system and method for detecting and countering unmanned aerial vehicles in an urban environment, which adopts a mode of photoelectric detection combined with radio early warning, and does not adopt a conventional radar detection mode for aerial targets. In this way, there is no need to actively radiate electromagnetic waves for detection during daily early warning. It is safe, environmentally friendly, and has low power consumption, and is suitable for urban environments. The front-end equipment in the system can be installed at a commanding height, and can carry out overall prevention and control of a certain range of areas. Compared with ground equipment, it has less obstruction and better effect. The radio detection equipment has early warning capability, but there are problems of false alarms and inability to detect atypical frequency bands. The photoelectric search and tracking equipment has no early warning capability, but the image information after stable tracking can verify the target, and the search capability can perform target search alone. The method of the present invention complements the two, performs data fusion on the display and control device side, and can detect, force land, and drive away unmanned aerial vehicles within the prevention and control range. The disposal method of electromagnetic interference is not easy to cause the crash of the unmanned aerial vehicle, reducing the probability of secondary injury.

[0063] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. An urban environment drone detection and countermeasure system, characterized in that: include: Radio detection and jamming equipment, optoelectronic search and tracking equipment, and display and control equipment; The radio detection and interference device is used to detect UAVs, send a first alarm message to the display and control device after detecting the UAV, and transmit a corresponding interference signal to interfere with the communication frequency band of the target UAV in response to the interference control command issued by the display and control device; wherein the first alarm message at least includes the position information and communication frequency band information of the UAV; The optoelectronic search and tracking device is used to detect the UAV, track the UAV in response to the tracking control instruction issued by the display and control device, and send a second alarm message to the display and control device after detecting or tracking the UAV; wherein the second alarm message includes at least the location information and image information of the UAV; The display and control device is used to generate corresponding tracking control instructions according to the position information of the UAV after receiving the first alarm information and send it to the optoelectronic search and tracking device, perform target identification and verification according to the image information of the UAV after receiving the second alarm information, and after verifying and identifying the target UAV, generate corresponding interference control instructions according to the communication frequency band information and position information of the target UAV and send it to the radio detection and interference device, and / or generate corresponding alarm reports and report them to the user; The optoelectronic search and tracking device comprises a turntable, a communication processing board and an infrared detector; the turntable is used to carry the infrared detector, and the communication processing board is used to realize information interaction within the optoelectronic search and tracking device; The photoelectric search and tracking device also includes a visible light camera, which is arranged on the turntable; The radio detection and interference equipment includes a detection antenna, an interference antenna, a receiving channel unit, an antenna power amplifier unit and a signal processing unit; The detection antenna is used to receive radio signals to detect drones, and to send echo data to the signal processing unit through the receiving channel unit; The signal processing unit is used to process based on the echo data to determine the orientation information and communication frequency band information of the UAV, and to process based on the interference control instruction issued by the display and control device to determine the frequency band and power of the interference signal, and send corresponding instructions to the antenna power amplifier unit; The antenna power amplifier unit is used to generate a corresponding interference signal in response to the instruction issued by the signal processing unit, and transmit it through the interference antenna; The antenna power amplifier unit generates a corresponding interference signal, including: Cover the communication frequency band of the target drone and generate a broadband jamming signal; Network connection equipment; The display and control device is connected to the radio detection and interference device and the optoelectronic search and tracking device through the network connection device; server; The server is connected to the radio detection and jamming device and the optoelectronic search and tracking device via the network connection device; The network connection device is connected to the radio detection and jamming device and the optoelectronic search and tracking device through optical fiber, and signal conversion is performed through an optical fiber transceiver.

2. A method for detecting and countering unmanned aerial vehicles in an urban environment, characterized in that: The urban environment drone detection and countermeasure system as claimed in claim 1 is implemented, comprising the following steps: S1. Detect UAVs through radio detection jammers and optoelectronic search and tracking equipment; S2. If the radio detection and jamming device detects a UAV, then execute step S3; if the photoelectric search and tracking device detects a UAV, then execute step S4 directly; S3, generating corresponding tracking control instructions according to the position information of the UAV obtained by the radio detection and jamming device, and sending the instructions to the optoelectronic search and tracking device to guide the optoelectronic search and tracking device to track the corresponding UAV; S4, performing target recognition and verification according to the image information of the UAV obtained by the optoelectronic search and tracking device, and determining whether the current UAV is the target UAV, if so, executing step S5, otherwise returning to step S1; S5. Generate and transmit corresponding interference signals according to the communication frequency band information and location information of the target UAV to interfere with the communication frequency band of the target UAV.

3. The method for detecting and countering unmanned aerial vehicles in an urban environment according to claim 2, characterized in that: In step S5, generating and transmitting a corresponding interference signal includes: With respect to the communication frequency band of the target UAV, a broadband interference signal covering the communication frequency band of the target UAV is generated and transmitted.

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