Unmanned aerial vehicle counter device and circuit

Abstract

An unmanned aerial vehicle counter device and circuit. The unmanned aerial vehicle counter circuit comprises a main control unit, a baseband unit, a radio frequency unit and an antenna unit, wherein the antenna unit comprises a receiving antenna and a transmitting antenna. The baseband unit comprises a receiving channel and a transmitting channel, and the radio frequency unit is connected to the transmitting antenna. The receiving antenna is used for receiving an electromagnetic wave signal and converting the electromagnetic wave signal into a first electric signal. The receiving channel is connected to the receiving antenna, and is used for performing signal processing on the first electric signal to obtain a second electric signal. The main control unit is connected to the receiving channel and is used for acquiring, on the basis of a preset software algorithm and the second electric signal, unmanned aerial vehicle information, and on the basis of the unmanned aerial vehicle information, generating a counter signal. The transmitting channel is separately connected to the main control unit and the radio frequency unit, and is used for performing signal processing on the counter signal and outputting to the transmitting antenna the processed signal by means of the radio frequency unit for transmitting.

Description

UAV countermeasure equipment and circuits

[0001] This application claims priority to the Chinese patent application filed with the China Patent Office on December 29, 2023, with application number 202311868561.9 and application name “UAV countermeasure equipment and circuit” and the Chinese patent application filed with the China Patent Office on July 14, 2023, with application number 202321857932.9 and application name “UAV interference circuit and its application equipment and system”, the entire contents of which are incorporated by reference into this application. Technical Field

[0002] The embodiments of the present application relate to the field of drone countermeasures, and in particular to a drone countermeasure device and circuit. Background Art

[0003] One way to control drones in a controlled area is to send counter signals to drones entering the controlled area, thereby improving the security of the controlled area.

[0004] When implementing signal countermeasures against drones entering controlled areas, traditional countermeasure solutions usually adopt a sweeping frequency countermeasure solution based on VCO or a sweeping frequency countermeasure solution based on DDS digital frequency synthesis technology. However, both countermeasure solutions have the problem of fixed and single countermeasure signal characteristics, and the configuration flexibility of the countermeasure signal is poor.

[0005] Summary of the Invention

[0006] Based on this, it is necessary to provide a drone countermeasure device and circuit.

[0007] A drone countermeasure circuit includes a main control unit, a baseband unit, a radio frequency unit, and an antenna unit, wherein the antenna unit includes a receiving antenna and a transmitting antenna. The baseband unit includes a receiving path and a transmitting path, and the radio frequency unit is connected to the transmitting antenna. The receiving antenna is used to receive electromagnetic wave signals and convert the electromagnetic wave signals into a first electrical signal. The receiving path is connected to the receiving antenna and is used to perform signal processing on the first electrical signal to obtain a second electrical signal. The main control unit is connected to the receiving path and is used to obtain drone information based on the second electrical signal based on a preset software algorithm and generate a countermeasure signal based on the drone information. The transmitting path is connected to the main control unit and the radio frequency unit respectively, and is used to perform signal processing on the countermeasure signal and output the processed signal to the transmitting antenna for transmission via the radio frequency unit.

[0008] A drone countermeasure device comprises the drone countermeasure circuit described above.

[0009] The details of one or more embodiments of the present application are set forth in the accompanying drawings and the description below. Other features, objects, and advantages of the invention will become apparent from the description, drawings, and claims. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, without paying any creative work, they can also obtain drawings of other embodiments based on these drawings.

[0011] FIG1 is a schematic diagram of a first circuit module of a UAV countermeasure circuit according to an embodiment of the present invention.

[0012] FIG2 is a schematic diagram of a second circuit module of a UAV countermeasure circuit according to an embodiment of the present invention.

[0013] FIG3 is a schematic diagram of a third circuit module of the UAV countermeasure circuit according to an embodiment of the present invention.

[0014] FIG4 is a schematic diagram of a fourth circuit module of the UAV countermeasure circuit according to an embodiment of the present invention.

[0015] Description of Figure Numbers:

[0016] 1: Main control unit, 2: Baseband unit, 3: Radio frequency unit, 4: Antenna unit.

[0017] 11: First main control unit, 12: Second main control unit.

[0018] A1, A3: first amplifier, A2, A4: second amplifier, B1, B3: first balun, B2, B4: second balun, S1, S3: first attenuator, S2, S4: second attenuator, Z1, Z3: first filter, Z2, Z4: second filter, PA1, PA2: power amplifier.

[0019] 41: transmitting antenna, 42: receiving antenna, ANT1: first receiving antenna, ANT2: second receiving antenna, ANT3: first transmitting antenna, ANT4: second transmitting antenna.

[0020] U1, U3: transmitter, U2, U4: receiver, U5: FPGA, U6: CPU. DETAILED DESCRIPTION

[0021] To facilitate understanding of the present application, a more comprehensive description of the present application will be provided below with reference to the accompanying drawings. The accompanying drawings illustrate preferred embodiments of the present application. However, the present application may be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to provide a more thorough and comprehensive understanding of the disclosure of the present application.

[0022] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which this application pertains. The terms used in this specification are for the purpose of describing specific embodiments only and are not intended to limit this application. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0023] In the present invention, unless otherwise expressly specified or limited, terms such as "installed," "connected," "connect," and "fixed" should be understood broadly. For example, they may refer to fixed connections, removable connections, or integration. "Connection" can refer to direct connections or indirect connections through an intermediary. It can refer to internal communication between two components or the interaction between two components. It can also refer to direct communication between two circuit modules or communication through other modules. Those skilled in the art will understand the specific meanings of these terms in the present invention based on specific circumstances.

[0024] When using traditional countermeasures to counter drones (such as a VCO-based swept-frequency countermeasure and a DDS digital frequency synthesis technology-based swept-frequency countermeasure), both of these countermeasures have the problem of fixed and single countermeasure signal characteristics. If the drone manufacturer subsequently modifies the power or format of the drone signal (i.e., the communication signal between the drone and the control terminal), or if a new model appears, without changing the hardware circuit, it will be impossible to identify the drone information and generate a corresponding countermeasure signal. Or, even if the drone information can be identified, the generated countermeasure signal will have a poor countermeasure effect. Therefore, the original countermeasure circuit hardware can only be significantly modified to adapt to the manufacturer's adjustments. As a result, the countermeasure signal configuration flexibility of these two traditional countermeasures is poor.

[0025] Figure 1 is a schematic diagram of the first circuit module of a drone countermeasure circuit according to an embodiment of the present invention. This embodiment of the drone countermeasure circuit includes a main control unit 1, a baseband unit 2, a radio frequency unit 3, and an antenna unit 4. The antenna unit 4 includes a transmitting antenna 41 and a receiving antenna 42. The baseband unit 2 includes a transmitting path 21 and a receiving path 22. The radio frequency unit 3 is connected to the transmitting path 21 and the transmitting antenna 41, respectively. In this embodiment, the receiving antenna 42 is used to receive electromagnetic wave signals and convert them into a first electrical signal. The receiving path 22 is connected to the receiving antenna 42 and is used to process the first electrical signal to obtain a second electrical signal. The main control unit 1 is connected to the receiving path 22 and is used to obtain drone information from the second electrical signal based on a preset software algorithm and generate a countermeasure signal based on the drone information. The transmitting path 21 is connected to the main control unit 1 and the radio frequency unit 3, and is used to process the countermeasure signal and output the processed signal via the radio frequency unit 3 to the transmitting antenna 41 for transmission.

[0026] In this embodiment, the receiving antenna 42 can be implemented as an omnidirectional receiving antenna or a directional receiving antenna, which is not limited in this embodiment. The receiving antenna 42 can receive electromagnetic wave signals in the air within the receiving frequency band and convert them into electrical signals (i.e., first electrical signals) before outputting them to the receiving path 22. The receiving path 22 can perform corresponding signal processing on the first electrical signal to obtain a second electrical signal that can represent relevant information about the drone. The main control unit 1 can analyze and process the second electrical signal by running a software algorithm to obtain relevant information about the drone, and can also generate a countermeasure signal corresponding to the drone information by running a preset software algorithm. The transmitting path 21 can perform corresponding transmit signal processing on the countermeasure signal output by the main control unit 1. The radio frequency unit 3 converts the processed countermeasure signal into a radio frequency signal and outputs it to the transmitting antenna 41, driving the transmitting antenna 41 to transmit electromagnetic wave signals that can interfere with the drone signal, thereby achieving countermeasures against the drone. The receive signal processing involved in the receiving path 22 and the transmit signal processing involved in the transmitting path 21 include, but are not limited to, amplification, filtering, analog-to-digital conversion, digital-to-analog conversion, signal analysis, etc., which are not limited in this embodiment.

[0027] In the technical solution of the embodiment of the present application, since the main control unit 1 uses a software algorithm to obtain drone information and generate countermeasure signals, if the drone information changes, it only needs to update the software algorithm in the main control unit 1 accordingly to re-realize the drone information identification and targeted generation of countermeasure signals. Compared with traditional sweep-frequency countermeasure solutions based on VCO or DDS digital frequency synthesis technology, there is no need to significantly change the original hardware circuit, thereby improving the flexibility of countermeasure signal configuration. Moreover, since the software algorithm is used to generate countermeasure signals specifically based on drone information, it is also beneficial to improve the countermeasure performance against drones.

[0028] Furthermore, as shown in FIG2 , in an optional embodiment, the main control unit 1 includes a first main control unit 11 and a second main control unit 12 connected to each other, and the first main control unit 11 is further connected to a receiving path 22 and a transmitting path 21. The first main control unit 11 is configured to identify the drone communication signal in the second electrical signal, and the first main control unit 11 or the second main control unit 12 is configured to obtain drone information based on the drone communication signal and generate the countermeasure signal based on the drone information based on a preset software algorithm.

[0029] In a specific application, the first main control unit 11 can be an FPGA, MCU, DSP, etc., and the second main control unit 12 can be a CPU, FPGA, MCU, DSP, etc. For example, the first main control unit 11 uses a preset software algorithm to identify whether the second electrical signal after signal processing contains a drone communication signal. Then, either the first main control unit 11 or the second main control unit 12 can use the preset software algorithm to decode the identified drone communication signal to obtain relevant drone information, including but not limited to the drone model, serial number, frequency band, location, distance, pitch angle, etc., and further generate a counter signal based on the drone information and the software algorithm. It should be noted that obtaining drone information and generating a counter signal can be implemented by the same main control unit (11, 12). For example, obtaining drone information and generating a counter signal are both implemented by the first main control unit 11 (e.g., FPGA U5).

[0030] Of course, obtaining drone information and generating countermeasure signals can also be implemented by different main control units. Preferably, obtaining drone information can be implemented by the first main control unit 11 (e.g., FPGAU5), and generating countermeasure signals can be implemented by the second main control unit 12 (e.g., CPU U6). In practical applications, for drone countermeasure devices with an alarm function, the functions of the drone countermeasure device include two parts: an alarm function and a countermeasure function. The alarm function can warn whether a drone has appeared. This alarm function requires higher timeliness than the countermeasure function in terms of timing (because the user needs to be warned as soon as the drone enters the detection range, while the countermeasure function is executed based on the user's actual countermeasure needs. For example, even if the alarm is issued, the user may not necessarily choose to use the countermeasure function). Since the presence of a drone in its detection range can be determined when the drone communication signal is identified, an alarm can be issued to indicate the presence of a drone when the drone communication signal in the second electrical signal is identified. Therefore, the technical solution of the present invention enables the first main control unit 11 that receives the second electrical signal earlier to identify the drone communication signal, so that the drone communication signal can be identified earlier to ensure the timeliness of the alarm, and the generation of the counter signal can be achieved by either the first main control unit 11 or the second main control unit 12, which is not limited in this embodiment.

[0031] Figure 2 is a schematic diagram of a second circuit module of a drone countermeasure circuit according to an embodiment of the present invention. The drone countermeasure circuit according to this embodiment includes a main control unit 1, a baseband unit 2, a radio frequency unit 3 and an antenna unit 4.

[0032] In the main control unit 1 of this embodiment, the main control unit 1 includes a first main control unit 11 and a second main control unit 12 connected to each other, wherein the first main control unit 11 is an FPGAU5 and the second main control unit 12 is a CPU U6. It should be understood that in actual applications, the second main control unit 12 should also include a peripheral circuit connected to the CPUU6 (not shown in the figure). In the baseband unit 2, the baseband unit 2 includes a transmission path 21, wherein the transmission path 21 includes a transmitter U1, a first balun B1, and a first filter Z1 connected in sequence, and the input end of the transmitter U1 is connected to the main control unit 1, and the output end of the first filter Z1 can be connected to the radio frequency unit 3. The number of transmission paths may be more than one, for example, two, where Figures 2 to 4 show the case where there are two transmission paths. In addition to the transmission path 21, Figures 2 to 4 also include a transmission path 23. To distinguish the components in the transmission path 21, the components in the transmission path 23 are numbered differently from those in the transmission path 21. Similarly, the transmission path 23 includes a transmitter U3, a first balun B3, and a first filter Z3 connected in sequence, and the input end of the transmitter U3 is connected to the main control unit 1, and the output end of the first filter Z3 can be connected to the RF unit 3.

[0033] In this embodiment, specifically, the input ends of the transmitters U1 and U3 can be connected to the first main control unit 11 in the main control unit 1. When a counter signal needs to be transmitted, the first main control unit 11 can output the corresponding counter signal to the corresponding transmission path (21, 23), and the transmitter U1 (or transmitter U3) performs digital-to-analog conversion and modulation processing on the counter signal, and can send the processed counter signal to the first filter Z1 (or first filter Z3) after passing it through the first balun B1 (or first balun B3) for filtering processing. Then, the first filter Z1 (or first filter Z3) amplifies the filtered counter signal through the radio frequency unit 3 and outputs it to the transmitting antenna 41 for transmission.

[0034] Furthermore, the transmission path (21, 23) also includes a first attenuator (S1, S3) connected between the output end of the first filter (Z1, Z3) and the radio frequency unit 3. Specifically, as shown in Figure 2, the transmission path 21 also includes a first attenuator S1 connected between the output end of the first filter Z1 and the radio frequency unit 3. The transmission path 23 includes a first attenuator S3 connected between the output end of the first filter Z3 and the radio frequency unit 3. In this embodiment, the first attenuator S1 (or the first attenuator S3) can attenuate the filtered signal to reduce the signal power of the counter signal output to the radio frequency unit 3, thereby achieving adjustment of the transmission power. Of course, in other optional embodiments, if the first attenuator S1 (or the first attenuator S3) is omitted, the transmitter U1 (or transmitter U3) can also adjust the signal power of the counter signal, thereby achieving adjustment of the transmission power.

[0035] Furthermore, the second main control unit 12 or the first main control unit 11 can also be connected to the first attenuator S1, and is used to control the attenuation of the first attenuator S1 according to the current countermeasure requirements. Similarly, the second main control unit 12 or the first main control unit 11 can also be connected to the first attenuator S3, and is used to control the attenuation of the first attenuator S3 according to the current countermeasure requirements. In this embodiment, the first attenuator S1 (or the first attenuator S3) is an attenuator with controllable attenuation, and the attenuation of the first attenuator S1 (or the first attenuator S3) is controlled by the second main control unit 12 or the first main control unit 11 according to actual needs.

[0036] In the baseband unit 2, the baseband unit 2 also includes a receiving path 22, wherein the receiving path 22 includes a receiver U2, a second balun B2, a second filter Z2, and a first amplifier A1 connected in sequence. The input of the first amplifier A1 is connected to the receiving antenna 42, and the output of the receiver U2 is connected to the main control unit 1 (such as the first main control unit 11). Similarly, the number of receiving paths can be more than one, for example, two. Figures 2 to 4 show a case where there are two receiving paths. In addition to the receiving path 22, Figures 2 to 4 also include a receiving path 24. To distinguish the components in the receiving path 22, the components in the receiving path 24 are numbered differently from those in the transmitting path 21. The receiving path 24 includes a receiver U4, a second balun B4, a second filter Z4, and a first amplifier A3 connected in sequence. The input of the first amplifier A3 is connected to the receiving antenna 42, and the output of the receiver U4 is connected to the main control unit 1.

[0037] In this embodiment, the number of receiving antennas 42 is the same as the number of receiving paths, and the receiving antennas 42 include a first receiving antenna ANT1 and a second receiving antenna ANT2. Specifically, the output ends of the receivers U2 and U4 can be connected to the first main control unit 11 in the main control unit 1. In the receiving path 22, the receiving antenna 42 corresponding to the receiving path 22 is the first receiving antenna ANT1. The first amplifier A1 can amplify the electrical signal (i.e., the first electrical signal) output by the first receiving antenna ANT1 in the receiving path 22 and output it to the second filter Z2. The second filter Z2 can filter the electrical signal amplified by the first amplifier A1 and output the filtered electrical signal to the receiver U2 through the second balun B2. The receiver U2 can perform analog-to-digital conversion and demodulation on the electrical signal filtered by the second filter Z2 and output it to the first main control unit 11 in the main control unit 1. Similarly, in the receiving path 24, the receiving antenna 42 corresponding to the receiving path 24 is the second receiving antenna ANT2. The first amplifier A3 can amplify the electrical signal (i.e., the first electrical signal) output by the receiving antenna ANT2 in the receiving path 24 and output it to the second filter Z4. The second filter Z4 can filter the electrical signal amplified by the first amplifier A3 and output the filtered electrical signal to the receiver U4 through the second balun B4. The receiver U4 can perform analog-to-digital conversion and demodulation on the electrical signal filtered by the second filter Z4 and output it to the first main control unit 11 in the main control unit 1. It can be understood that the electrical signal output by the receiver U2 (or receiver U4) is the second electrical signal.

[0038] Furthermore, the receiving paths (22, 24) further include second amplifiers (A2, A4) connected between the second filters (Z2, Z4) and the second baluns (B2, B4). As shown in FIG2 , the receiving path 22 further includes a second amplifier A2 connected between the second filter Z2 and the second balun B2. Similarly, the receiving path 24 further includes a second amplifier A4 connected between the second filter Z4 and the second balun B4. In this embodiment, the receiving paths (22, 24) have a two-stage amplification structure, with the first stage of amplification being implemented by the first amplifier A1 (or the first amplifier A3) and the second stage of amplification being implemented by the second amplifier A2 (or the second amplifier A4).

[0039] Furthermore, the receiving path (22, 24) further includes a second attenuator (S2, S4) connected between the second filter (Z2, Z4) and the first amplifier (A1, A3). As shown in FIG2 , the receiving path 22 further includes a second attenuator S2 connected between the second filter Z2 and the first amplifier A1. Similarly, the receiving path 24 further includes a second attenuator S4 connected between the second filter Z4 and the first amplifier A3. In this embodiment, the structure of the receiving path (22, 24) is a two-stage amplification structure, and the inventors have found in actual applications that since the first stage of amplification is implemented by the first amplifier A1 (or the first amplifier A3), the signal will not be amplified much after passing through the first amplifier A1 (or the first amplifier A3), and there will be no risk of oversaturation. The second stage of amplification is implemented by the second amplifier A2 (or the second amplifier A4). Since the second amplifier A2 (or the second amplifier A4) is a two-stage amplification, it may be oversaturated, resulting in output signal distortion. Therefore, providing a second attenuator S2 (or the second attenuator S4) before the second amplifier A2 (or the second amplifier A4) can avoid oversaturation of the second amplifier A2 (or the second amplifier A4). Furthermore, since the first main control unit 11 has requirements for an acceptable input signal amplitude range, if the input signal amplitude does not fall within this range, the operation of the first main control unit 11 may be affected, potentially reducing the resolution of the second electrical signal received by the first main control unit 11, resulting in a higher error rate in the first main control unit 11's recognition of drone communication signals. Therefore, this embodiment of the present invention provides a second attenuator S2 (or second attenuator S4) between the first amplifier (A1, A3) and the second amplifier (A2, A4), specifically between the second filter Z2 (or second filter Z4) and the first amplifier A1 (or first amplifier A3). This allows the attenuation value of the second attenuator S2 (or second attenuator S4) to be adjusted so that the second electrical signal ultimately entering the first main control unit 11 falls within the acceptable range of the first main control unit 11, thereby improving the accuracy of drone detection.

[0040] It should be noted that if the second attenuator (S2, S4) is placed after the second amplifier (A2, A4), for example, between the second amplifier (A2, A4) and the second balun (B2, B4), the output signal of the second amplifier (A2, A4) may already be distorted due to oversaturation. Therefore, even if the second attenuator (S2, S4) is subsequently used to perform power control on the distorted electrical signal, the degree of distortion cannot be eliminated, and therefore, the recognition error rate of the drone communication signal by the first main control unit 11 cannot be improved. In addition, if the second attenuator (S2, S4) is placed before the first amplifier (A1, A3), for example, between the first amplifier (A1, A3) and the receiving antenna (ANT1, ANT2) in the antenna unit 4, the receiving sensitivity of the receiving antenna (ANT1, ANT2) will be affected. The embodiment of the present invention, by arranging the second attenuator (S2, S4) between the first amplifier (A1, A3) and the second amplifier (A2, A4), can effectively avoid oversaturation of the output signal of the second amplifier (A2, A4), avoid the second electrical signal input to the first main control unit 11 not being within the acceptable signal range of the first main control unit 11, and also avoid affecting the receiving sensitivity of the receiving antenna (ANT1, ANT2).

[0041] Furthermore, in the receiving paths 22 and 24, the first amplifier is preferably a low-noise amplifier. As shown in FIG2 , the first amplifier A1 (or the first amplifier A3) is preferably a low-noise amplifier. Since the first amplifier A1 (or the first amplifier A3) is the device that performs the first amplification of the electrical signal in the receiving paths (22, 24), the embodiment of the present invention uses a low-noise amplifier as the first amplifier (A1, A3). This allows the electrical signal output by the receiving antenna (ANT1, ANT2) to be initially amplified while introducing low noise, thereby ensuring that the noise of subsequent electrical signals is not excessive.

[0042] Furthermore, the main control unit 1 may also be connected to a second attenuator (S2, S4), and the main control unit 1 may be further configured to adjust the attenuation of the second attenuator (S2, S4) so ​​that the signal amplitude of the second electrical signal received by the main control unit 1 is within a preset amplitude range. For example, as shown in FIG2 , the first main control unit 11 may also be connected to the second attenuator S2 (or the second attenuator S4), and the first main control unit 11 may be further configured to adjust the attenuation of the second attenuator S2 (or the second attenuator S4) so ​​that the signal amplitude of the second electrical signal received by the first main control unit 11 is within a preset amplitude range.

[0043] It should be understood that in some other embodiments, the transmitter U1 and the receiver U2 can be integrated into a transceiver. Similarly, the transmitter U3 and the receiver U4 can be integrated into another transceiver. That is, the transmitter U1 and the receiver U2 can be implemented using one transceiver, and the transmitter U3 and the receiver U4 can be implemented using another transceiver.

[0044] In one embodiment, the RF unit 3 includes two sub-RF units, as shown in Figure 2 . One sub-RF unit includes a power amplifier PA1, and the other sub-RF unit includes a power amplifier PA2. The power amplifier PA1 is connected to the transmit path 21, and the power amplifier PA2 is connected to the transmit path 23. It should be understood that in other embodiments, the number of RF sub-units may be one or greater than two, and the number of transmit paths and transmit antennas 41 may be the same as the number of sub-RF units. Furthermore, all transmit paths are connected one-to-one with all sub-RF units, and all sub-RF units are connected one-to-one with all transmit antennas 41. In other words, one corresponding transmit path, one sub-RF unit, and one transmit antenna constitute a transmit path, and there may be multiple transmit paths. In this way, the main control unit 1 can output multiple different countermeasure signals to multiple transmit paths, and each transmit path can output its own countermeasure signal through the connected sub-RF unit to the corresponding transmit antenna 41. This allows simultaneous SDR jamming of multiple drones through multiple transmit paths. For example, when the main control unit 1 recognizes that there are two or more drone communication signals, it can choose to simultaneously transmit two (or more) different countermeasure signals according to actual needs.

[0045] 2 to 4 , the antenna unit 4 may include two transmitting antennas 41. As shown in FIG2 to 4 , one transmitting antenna 41 includes a first transmitting antenna ANT3 for transmitting a 2.4 GHz counter signal, and the other transmitting antenna 41 includes a second transmitting antenna ANT4 for transmitting a 5.8 GHz counter signal. It should be noted that, since the most commonly used communication frequency bands for drones are currently the 2.4 GHz and 5.8 GHz bands, the embodiments of the present invention, by transmitting counter signals for these two frequency bands, can ensure the counter effect of the drone counter circuit of the present invention for at least these two primary frequency bands when there are a large number of drones. It should be understood that in other embodiments, the number of transmitting antennas 41 may be more than two, and may include at least one first transmitting antenna ANT3 for transmitting a 2.4 GHz counter signal and at least one second transmitting antenna ANT4 for transmitting a 5.8 GHz counter signal.

[0046] In this embodiment, the antenna unit 4 also includes two receiving antennas 42, comprising a first receiving antenna ANT1 and a second receiving antenna ANT2. The first receiving antenna ANT1 is connected to the receiving path 22, and the second receiving antenna ANT2 is connected to the receiving path 24. Furthermore, the first receiving antenna ANT1 can be an omnidirectional receiving antenna, while the second receiving antenna ANT2 can be a directional receiving antenna. Since directional receiving antennas have the advantage of long detection ranges in the direction of their main lobe radiation, and omnidirectional receiving antennas have the advantage of a 360-degree reconnaissance range, the drone countermeasure circuit in this embodiment can leverage the advantages of directional receiving antennas to quickly detect drones located at a considerable distance in the direction of the directional receiving antenna's main lobe radiation, thereby improving reconnaissance efficiency. Furthermore, the omnidirectional receiving antennas can also be used to perform real-time reconnaissance of drones within a 360-degree range, thereby achieving a guard duty function. It should be understood that in other embodiments, the number of receiving antennas 42 and receiving paths may be greater than two, with at least one receiving antenna 42 being an omnidirectional receiving antenna and at least one being a directional receiving antenna. Of course, in some other embodiments, the number of the receiving path and the number of the receiving antenna 42 may be one respectively, and the receiving antenna 42 may be an omnidirectional receiving antenna or a directional receiving antenna.

[0047] The working principle of the drone countermeasure circuit of this embodiment is described below with reference to FIG2 .

[0048] During signal reception, the receiving antenna 42 in the antenna unit 4 receives electromagnetic wave signals from the air, converts them into electrical signals, and outputs them to the baseband unit 2. Within the baseband unit 2, the signals are processed by corresponding functional modules and then output to the first main control unit 11 (e.g., FPGA U5). The first main control unit 11 uses a preset software algorithm to identify whether the processed electrical signals contain drone communication signals. The first main control unit 11 or the second main control unit 12 then decodes the drone communication signals to obtain relevant drone information.

[0049] This embodiment has two receiving paths that can operate simultaneously. The following uses the receiving path 22 corresponding to the first receiving antenna ANT1 as an example to explain the functions of the corresponding functional modules in the receiving path during the signal reception process. The first amplifier A1 amplifies the electrical signal output by the first receiving antenna ANT1 and outputs it to the second attenuator S2. The second attenuator S2 attenuates the electrical signal and outputs it to the second filter Z2. The second filter Z2 filters the electrical signal and outputs it to the second amplifier A2. The second amplifier A2 then amplifies the electrical signal again and outputs it to the receiving end of the receiver U2 through the second balun B2. The receiver U2 performs analog-to-digital conversion and demodulation on the electrical signal before outputting it to the first main control unit 11. It should be understood that the functions of the various functional modules in the receiving path 24 can be referred to in the above description and will not be repeated here.

[0050] When scouting drones, the two receiving paths 22 and 24 can work simultaneously. The directional receiving antenna has the advantage of a long detection distance in the radiation direction of its main lobe, and the omnidirectional receiving antenna has the advantage of a reconnaissance range of up to 360 degrees. In the embodiment of the present invention, the respective advantages of the directional receiving antenna and the omnidirectional receiving antenna are simultaneously utilized, so that not only can drones located at a long distance in the radiation direction of the main lobe of the directional receiving antenna be quickly scoured, but also a duty function of real-time detection of whether a drone appears within a 360-degree range can be realized.

[0051] During the above-described operation, the first main control unit 11 can also be electrically connected to the second attenuator S2 (second attenuator S4) to control the signal attenuation amplitude of the second attenuator S2 (second attenuator S4) according to the signal amplitude of the received second electrical signal. For example, the stronger the signal strength of the second electrical signal, the greater the signal attenuation amplitude of the second attenuator S2 (second attenuator S4). This ensures that the signal amplitude of the second electrical signal received by the first main control unit 11 is within the range suitable for reception by the first main control unit 11, facilitating signal processing by the first main control unit 11. Furthermore, for drone countermeasures, the receiving channel requires high data real-time performance. Therefore, if the first main control unit 11 is an FPGA, due to its fast data processing speed, using the first main control unit 11 to control the attenuation amplitude of the second attenuator S2 (second attenuator S4) can meet real-time requirements. Furthermore, the second attenuator S2 is positioned between the second amplifier A2 and the first amplifier A1 to prevent signal saturation in the second amplifier A2. Likewise, the second attenuator S4 provided between the second amplifier A4 and the first amplifier A3 can also prevent the signal of the second amplifier A4 from being saturated.

[0052] During the signal transmission process, the second main control unit 12 (such as CPU U6) can obtain the counter frequency band information currently input by the user or the preset counter frequency band information, and send it to the first main control unit 11, so that the first main control unit 11 uses the preset software algorithm to generate a targeted counter signal according to the counter frequency band information encoding. After the counter signal is processed by the subsequent corresponding transmission path, it drives the transmitting antenna 41 in the antenna unit 4 to generate an electromagnetic wave signal of the corresponding frequency band, thereby achieving communication interference with the drone. Of course, the generation of the counter signal can also be performed by the second main control unit 12.

[0053] This embodiment has two transmitting paths (21, 23) that can operate simultaneously. Here, the transmitting path 21 corresponding to the first transmitting antenna ANT3 is used as an example to illustrate the functions of the corresponding functional modules in the transmitting path during the transmission process. The transmitter U1 performs digital-to-analog conversion, modulation, and RF amplification on the received countermeasure signal, and outputs the processed countermeasure signal to the first filter Z1 after passing through the first balun B1. The first filter Z1 filters the countermeasure signal and outputs it to the first attenuator S1. The first attenuator S1 can configure the power of the countermeasure signal to an appropriate power according to the current countermeasure requirements, for example, attenuating the original power to a lower power signal. The first attenuator S1 attenuates the countermeasure signal and transmits it through the first transmitting antenna ANT3. It should be understood that the functions of the various functional modules in the transmitting path 23 can refer to the above description and are not repeated here. In addition, the attenuation of the first attenuator S1 (first attenuator S3) can be controlled by the first main control unit 11 or the second main control unit 12 according to the current countermeasure requirements.

[0054] As can be seen from the above working principle, the decoding of drone communication signals and the generation of countermeasure signals can be determined by the software algorithm in the first main control unit 11 or the second main control unit 12. That is, SDR (software defined radio) technology is adopted in the first main control unit 11 or the second main control unit 12. Therefore, by designing the software algorithm in the first main control unit 11 or the second main control unit 12, the first main control unit 11 or the second main control unit 12 can be equipped with countermeasure signals of different modes defined according to different countermeasure requirements, thereby improving the configurability of the countermeasure signal flexibility. In addition, the software algorithm in the first main control unit 11 or the second main control unit 12 can be subsequently upgraded to achieve the effects of improving countermeasure performance and signal decoding efficiency, without the need to make significant changes to the hardware circuit of the drone countermeasure circuit, making the upgrade of the countermeasure system more convenient and efficient.

[0055] FIG3 is a schematic diagram of a third circuit module of an embodiment of a drone countermeasure circuit according to the present invention. The difference between the drone countermeasure circuit of this embodiment and the embodiment shown in FIG2 is that the drone countermeasure circuit of this embodiment further includes an additional unit 5 connected to the main control unit 1. The additional unit includes an alarm component 51 and a display component 52. Specifically, the alarm component 51 and the display component 52 can be connected to the second main control unit 12 (e.g., CPU U6) in the main control unit 1. The alarm component 51 is used to issue an alarm prompt under the control of the main control unit 1 when the main control unit 1 obtains drone information. For example, the alarm prompt can be output in the form of sound, light, electricity, vibration, etc. to prompt the operator that a drone has been detected. The display component 52 is used to display the drone information under the control of the main control unit 1 when the main control unit 1 obtains drone information, such as the frequency band of the drone communication signal, the location of the drone, the distance between the drone and the device where the drone countermeasure circuit is located, the pitch angle between the drone and the device where the drone countermeasure circuit is located, etc., so that the operator can decide whether to transmit a countermeasure signal, configure the frequency band of the countermeasure signal, and other operations based on the displayed drone information to achieve auxiliary strikes, thereby improving the effectiveness of countermeasures against drones. Of course, the additional unit 5 of the drone countermeasure circuit in this embodiment of the present invention can also further include an input component (not shown) connected to the main control unit 1 (for example, connected to the second main control unit 12). The input component can be used to receive the communication frequency band of the drone to be countermeasured input by the user and send it as the frequency band of the countermeasure signal to the main control unit 1 so that the main control unit 1 can generate a countermeasure signal corresponding to the countermeasure frequency band. In another optional embodiment, the input component and the display component 52 can be integrated into a user interaction component, which can be implemented using, for example, a touch screen display.

[0056] FIG4 is a schematic diagram of a fourth circuit module of the drone countermeasure circuit of the present invention. The drone countermeasure circuit of this embodiment differs from the embodiment shown in FIG3 only in that the additional unit 5 of this embodiment further includes a data interface 53 connected to the main control unit 1. This data interface 53 is used to output received data to the main control unit 1 to update the software algorithm in the main control unit 1. This allows for more convenient and efficient system upgrades, as the countermeasure effectiveness and decoding efficiency can be improved by upgrading the software algorithm without replacing hardware components. Furthermore, the data interface 53 can be, for example, a micro USB interface or a USB Type-C interface, though this embodiment is not limited thereto. The second main control unit 12 can be electrically connected to the data interface 53, allowing an operator to write a new software algorithm to the second main control unit 12 via the data interface 53. The second main control unit 12 then communicates with the first main control unit 11 to upgrade the software algorithms in both the first and second main control units 11 and 12. Of course, the above-mentioned upgrading method is only an example, and the specific algorithm upgrading method in the first main control unit 11 and the second main control unit 12 is not limited in this solution.

[0057] It should be noted that the embodiment of Figure 3 shows a case where the additional unit 5 includes an alarm component 51 and a display component 52, and the embodiment of Figure 4 shows a case where the additional unit 5 includes an alarm component 51, a display component 52, and a data interface 53. In other optional embodiments, the additional component 5 may include any one of the alarm component 51, the display component 52, and the data interface 53 (not shown in the figure), or the additional unit 5 may also include the alarm component 51 and the data interface 53 (not shown in the figure), or the additional unit 5 may also include the display component 52 and the data interface 53 (not shown in the figure).

[0058] The present invention also constructs a drone countermeasure device, which includes a drone countermeasure circuit. The circuit module diagram of the drone countermeasure circuit can be referred to the above description and will not be repeated here.

[0059] The above description includes examples of one or more embodiments. Of course, it is not possible to describe all possible combinations of components or methods for the purpose of describing the above embodiments, but it will be recognized by those skilled in the art that the various embodiments may be further combined and arranged. Therefore, the embodiments described herein are intended to cover all such changes, modifications and variations that fall within the scope of protection of the appended claims. In addition, to the extent that the term "comprising" is used in the specification or claims, the term is intended to be encompassed in a manner similar to the term "including", as explained by the use of "including" as a transitional word in the claims. In addition, any use of the term "or" in the specification of the claims is intended to mean a "non-exclusive or".

[0060] The technical features of the above-mentioned embodiments can be combined arbitrarily. In order to make the description concise, not all possible combinations of the technical features in the above-mentioned embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0061] The above-described embodiments merely represent several implementation methods of the present application. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that a person of ordinary skill in the art may make various modifications and improvements without departing from the spirit of the present application, and these modifications and improvements fall within the scope of protection of the present application. Therefore, the scope of protection of the present patent application shall be determined by the appended claims.

Claims

1. A drone countermeasure circuit, comprising a main control unit, a baseband unit, a radio frequency unit and an antenna unit, wherein: The antenna unit includes a receiving antenna and a transmitting antenna; the baseband unit includes a receiving path and a transmitting path, and the radio frequency unit is connected to the transmitting antenna; The receiving antenna is used to receive an electromagnetic wave signal and convert the electromagnetic wave signal into a first electrical signal; The receiving path is connected to the receiving antenna and is used to perform signal processing on the first electrical signal to obtain a second electrical signal; The main control unit is connected to the receiving path and is used to obtain drone information according to the second electrical signal and generate a countermeasure signal according to the drone information based on a preset software algorithm; The transmission path is connected to the main control unit and the radio frequency unit respectively, and is used to process the counter signal and output the processed signal to the transmission antenna through the radio frequency unit for transmission.

2. The drone countermeasure circuit according to claim 1, characterized in that: The main control unit includes a first main control unit and a second main control unit connected to each other, and the first main control unit is also connected to the receiving path and the transmitting path, wherein, The first main control unit is used to identify the drone communication signal in the second electrical signal; The first main control unit or the second main control unit is used to obtain drone information according to the drone communication signal based on a preset software algorithm, and generate the counter signal according to the drone information.

3. The drone countermeasure circuit according to claim 1, characterized in that: The RF unit includes at least two sub-RF units, the number of the transmitting paths and the transmitting antennas is the same as the number of the sub-RF units, all the transmitting paths are connected one-to-one to all the sub-RF units, and all the sub-RF units are connected one-to-one to all the transmitting antennas.

4. The drone countermeasure circuit according to claim 1, characterized in that: The number of the receiving path and the receiving antenna is one, and the receiving antenna is an omnidirectional receiving antenna or a directional receiving antenna; or, The number of the receiving paths and the receiving antennas are both at least two, and all the receiving paths One-to-one connection is made with all the receiving antennas, wherein at least one of the receiving antennas is an omnidirectional receiving antenna and at least one of the receiving antennas is a directional receiving antenna.

5. The drone countermeasure circuit according to claim 1, characterized in that: The drone countermeasure circuit further includes at least one of the following: A data interface, connected to the main control unit, for outputting the received data to the main control unit to update the software algorithm in the main control unit; A display component, connected to the main control unit and used to display the drone information under the control of the main control unit; The alarm component is connected to the main control unit and is used to issue an alarm prompt under the control of the main control unit when the main control unit obtains the drone information.

6. The drone countermeasure circuit according to claim 1, characterized in that: The transmission path includes a transmitter, a first balun, and a first filter which are connected in sequence, and an input end of the transmitter is connected to the main control unit, and an output end of the first filter is connected to the radio frequency unit.

7. The drone countermeasure circuit according to claim 6, characterized in that: The transmission path also includes: A first attenuator is connected between an output end of the first filter and the radio frequency unit.

8. The drone countermeasure circuit according to claim 1, characterized in that: The receiving path includes a receiver, a second balun, a second filter, and a first amplifier which are connected in sequence, and an input end of the first amplifier is connected to the receiving antenna, and an output end of the receiver is connected to the main control unit.

9. The drone countermeasure circuit according to claim 8, characterized in that: The first amplifier is a low noise amplifier.

10. The drone countermeasure circuit according to claim 8, characterized in that: The receive path also includes a second amplifier connected between the second filter and the second balun.

11. The drone countermeasure circuit according to claim 10, characterized in that: The receive path also includes a second attenuator connected between the second filter and the first amplifier.

12. The drone countermeasure circuit according to claim 11, characterized in that: The main control unit is also connected to the second attenuator, and is further used to adjust the attenuation degree of the second attenuator so that the signal amplitude of the second electrical signal received by the main control unit is within a preset amplitude range.

13. The drone countermeasure circuit according to claim 12, characterized in that: The main control unit includes a first main control unit, and the first main control unit is also connected to the receiving path and the transmitting path; the first main control unit is an FPGA; The first main control unit is also connected to the second attenuator, and the first main control unit is further used to adjust the attenuation degree of the second attenuator so that the signal amplitude of the second electrical signal received by the main control unit is within a preset amplitude range.

14. The drone countermeasure circuit according to claim 7, characterized in that: The main control unit is also connected to the first attenuator, and is used to control the attenuation of the first attenuator according to countermeasure requirements.

15. A drone countermeasure device, comprising a drone countermeasure circuit; the drone countermeasure circuit comprises a main control unit, a baseband unit, a radio frequency unit and an antenna unit, wherein: The antenna unit includes a receiving antenna and a transmitting antenna; the baseband unit includes a receiving path and a transmitting path, and the radio frequency unit is connected to the transmitting antenna; The receiving antenna is used to receive an electromagnetic wave signal and convert the electromagnetic wave signal into a first electrical signal; The receiving path is connected to the receiving antenna and is used to perform signal processing on the first electrical signal to obtain a second electrical signal; The main control unit is connected to the receiving path and is used to obtain drone information according to the second electrical signal and generate a countermeasure signal according to the drone information based on a preset software algorithm; The transmission path is connected to the main control unit and the radio frequency unit respectively, and is used to process the counter signal and output the processed signal to the transmission antenna through the radio frequency unit for transmission.

16. The drone countermeasure device according to claim 15, characterized in that: The transmission path includes a transmitter, a first balun, a first filter, and a first attenuator which are connected in sequence, and the input end of the transmitter is connected to the main control unit, and the output end of the first attenuator is connected to the radio frequency unit.

17. The drone countermeasure device according to claim 16, characterized in that: The main control unit is also connected to the first attenuator, and is used to control the attenuation of the first attenuator according to countermeasure requirements.

18. The drone countermeasure device according to claim 15, characterized in that: The receiving path includes a receiver, a second balun, a second amplifier, a second filter, a second attenuator, and a first amplifier connected in sequence, and the input end of the first amplifier is connected to the receiving antenna, and the output end of the receiver is connected to the main control unit.

19. The drone countermeasure device according to claim 18, characterized in that: The main control unit is also connected to the second attenuator, and is further used to adjust the attenuation degree of the second attenuator so that the signal amplitude of the second electrical signal received by the main control unit is within a preset amplitude range.

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