Distributed team and group cooperative unmanned aerial vehicle broadband interference device and method

Abstract

The invention provides a distributed team and group cooperative unmanned aerial vehicle broadband interference device and a distributed team and group cooperative unmanned aerial vehicle broadband interference method. The broadband interference device for the unmanned aerial vehicle comprises a main control unit which is used for generating a digital baseband interference signal according to received unmanned aerial vehicle wireless signal characteristic data, sending the digital baseband interference signal to a radio frequency transceiver, configuring working parameters of the radio frequency transceiver and controlling on and off of a power supply of a radio frequency unit through a power supply unit; the communication unit is used for receiving unmanned aerial vehicle wireless signal feature data detected by unmanned aerial vehicle full-frequency detection equipment in a team and sending the unmanned aerial vehicle wireless signal feature data to the main control unit; the radio frequency unit comprises a radio frequency transceiver and at least one transmitting channel, and each transmitting channel comprises a group of broadband radio frequency power amplifiers and broadband omnidirectional antennas; and a power supply unit; according to the broadband interference method for the unmanned aerial vehicle, through joint optimization design of digital interference signals in multiple dimensions such as a time domain, a frequency domain and a space domain, the weight and the size of portable interference equipment are reduced, and meanwhile, the interference capability to the unmanned aerial vehicle is improved.

Description

Technical Field

[0001] The present invention relates to the field of intelligent security, and in particular to a distributed team collaborative UAV broadband interference device and method. Background Art

[0002] Due to the convenience of operation and low selling price, consumer UAVs have been rapidly popularized in the civilian market, and aerial photography, entertainment, etc. have become typical applications of consumer UAVs. Due to the large number of UAVs in use, accidents caused by illegal use of UAVs are also increasing. In order to ensure the safety of important places or major events, UAV countermeasure devices have emerged as the times require.

[0003] The existing UAV countermeasure devices mainly use radio interference to counter and strike UAVs. The main device forms include fixed UAV interference boxes, portable UAV interference backpacks or UAV interference guns. These devices are all single devices and do not consider the collaboration between devices. When performing tasks such as border patrol or major event guarantee, it is usually a team collaborative work mode, that is, multiple people jointly execute relevant tasks, and the distributed collaboration between devices is used to improve the interference efficiency and strike distance and reduce the weight and volume of portable interference devices. Currently, no related products have emerged.

[0004] At the same time, due to the advantages of narrowband power amplifiers with a working bandwidth of 100 MHz to 150 MHz, such as built-in interference sources, mature technology, low price, high power amplifier efficiency, and high narrowband antenna gain, most of the existing UAV interference devices are composed of several narrowband power amplifiers and antennas covering different key frequency bands stacked together, and the interference source uses a low-cost analog linear sweep signal based on a voltage controlled oscillator (VCO). When the flight control and video transmission wireless signals of UAVs become more and more customized with the development of software radio technology, achieving full-frequency on-demand wireless interference has become an important technical requirement for effectively interfering with various UAVs. However, using the method of stacking narrowband power amplifiers cannot achieve full-frequency coverage, and at the same time, as the number of narrowband power amplifiers increases, the weight and volume of portable interference devices will also increase, reducing the portability of the devices. Summary of the Invention

[0005] To solve at least one technical problem in the prior art, an embodiment of the present invention provides a distributed team collaborative UAV broadband interference device and method, which utilizes the naturally formed distributed space diversity gain among team members, and through the joint optimization design of digital interference signals in multiple dimensions such as time domain, frequency domain, and space domain, improves the interference ability against UAVs while reducing the weight and volume of portable interference devices. To achieve the above technical objectives, the technical solution adopted in the embodiment of the present invention is: In a first aspect, an embodiment of the present invention provides a distributed team-coordinated UAV broadband jamming device, comprising: The main control unit is used to generate a digital baseband interference signal based on the received drone wireless signal characteristic data and send it to the RF transceiver, and to configure the working parameters of the RF transceiver, and to control the opening and closing of the RF unit power supply through the power supply unit; The communication unit is used to receive the wireless signal characteristic data of the drone detected by the drone full-frequency detection equipment in the team and send it to the main control unit; The radio frequency unit includes a radio frequency transceiver and at least one transmission channel, wherein the transmission channel includes a set of broadband radio frequency power amplifiers and broadband omnidirectional antennas; the radio frequency transceiver is used to generate a radio frequency interference signal according to the received digital baseband interference signal, amplify the power through the broadband radio frequency power amplifier, and then transmit the radio frequency interference signal through the broadband omnidirectional antenna; The power supply unit is used to supply power to the main control unit, the communication unit and the radio frequency unit; the power supply unit can control the opening and closing of the radio frequency unit power supply.

[0006] Furthermore, the main control unit sends the generated digital baseband interference signal to the RF transceiver through the LVDS interface; the main control unit configures the working parameters of the RF transceiver through the SPI interface; the main control unit connects to the power supply unit through the RF power control IO port and controls the opening and closing of the RF unit power through the power supply unit.

[0007] Furthermore, the radio frequency unit is configured with two sets of broadband radio frequency power amplifiers and broadband omnidirectional antennas, covering the 0 GHz to 4 GHz and 4 GHz to 6 GHz frequency bands respectively.

[0008] In a second aspect, an embodiment of the present invention provides a distributed team cooperative UAV broadband jamming method, which is applicable to the distributed team cooperative UAV broadband jamming device as described above, including: Step S10, after the distributed team cooperative UAV broadband jammer is turned on, the radio frequency unit is in a closed state, the main control unit is in a dormant state, and the communication unit is in a standby listening state; the communication unit continuously waits to receive an alarm message including a UAV list sent by the UAV full-frequency detection device; the UAV list includes UAV wireless signal characteristic data; the UAV wireless signal characteristic data includes the UAV center frequency point and UAV signal bandwidth of each UAV; Step S20, when the communication unit receives the alarm information, it wakes up the main control unit and sends the alarm information to the main control unit. The main control unit turns on the power of the RF unit according to the center frequency, signal bandwidth and possible frequency hopping time slot of each drone in the alarm information, and configures the enabled transmission channel of the RF transceiver and the center frequency of the RF interference signal; Step S30, the main control unit generates a time-domain baseband interference signal through a baseband modulation process; specifically including: Step S301, configure the basic bandwidth of subcarriers according to the current center frequency point and signal bandwidth of the UAV to be interfered; generate a pseudo-noise code using the same starting phase m-sequence and then perform binary phase shift keying (BPSK) modulation to generate a frequency-domain baseband interference signal; the generated frequency-domain baseband interference signal should be larger than the UAV signal bandwidth by an extended bandwidth; each subcarrier in the frequency-domain baseband interference signal carries a BPSK modulation symbol. Step S303, for one or more frequency-domain baseband interference signals generated in the above steps; perform zero-padding in the frequency domain for the frequency bands without interference to obtain multiple subcarriers with a bandwidth of the basic bandwidth, and perform zero-padding in the frequency domain respectively below the lowest frequency band and above the highest frequency band of all the frequency-domain baseband interference signals as a whole to obtain b = m * 2 n subcarriers; then perform an inverse fast Fourier transform (IFFT) of b points to convert one or more frequency-domain baseband interference signals into a time-domain baseband interference signal. Step S304, perform convolution of the time-domain baseband interference signal with an N orthogonal convolution codeword to complete spatial domain orthogonal coding modulation to obtain a digital baseband interference signal. Step S305, perform low-pass filtering on the digital baseband interference signal. Step S40, the main control unit sends the generated digital baseband interference signal to the radio frequency transceiver; the digital baseband interference signal is subjected to FIR filtering and digital-to-analog conversion by the radio frequency transceiver, mixed to the specified center frequency point to obtain a radio frequency interference signal, the radio frequency interference signal is power-amplified by a broadband radio frequency power amplifier, and then transmitted through a broadband omnidirectional antenna.

[0009] Further, when the UAV is in the frequency hopping working mode; The UAV wireless signal characteristic data in Step S10 further includes frequency hopping time slots. In Step S30, when the UAV is in the frequency hopping working mode and the frequency hopping range of the UAV exceeds the maximum baseband frequency width of the radio frequency transceiver minus the UAV signal bandwidth, each UAV broadband interference device independently and randomly generates a time-division digital baseband interference signal; at most one digital baseband interference signal with a bandwidth not greater than the maximum baseband frequency width of the radio frequency transceiver is generated in each time period. Between Step S301 and Step S303, it further includes: Step S302, when the UAV is in the frequency hopping working mode, generate frequency-domain baseband interference signals for each frequency hopping frequency point according to the method of Step S301.

[0010] Further, when the UAV is not in the frequency hopping working mode, a frequency-domain baseband interference signal is generated, and then zero-padding operations are respectively performed below the lowest frequency band and above the highest frequency band of the frequency-domain baseband interference signal to obtain b = m * 2 n sub-carriers; When the UAV is in the frequency hopping working mode, multiple frequency-domain baseband interference signals are generated. First, zero-padding operations are performed in the frequency bands without interference between the frequency-domain baseband interference signals; then zero-padding operations are respectively performed below the lowest frequency band and above the highest frequency band of all the multiple frequency-domain baseband interference signals as a whole to obtain b = m * 2 n sub-carriers.

[0011] Further, in step S305, a raised cosine roll-off shaping low-pass filter is performed on the digital baseband interference signal.

[0012] Further, after step S40, it further includes: Step S50, after interfering with the radio frequency interference signal for more than the specified interference time, the main control unit turns off the radio frequency unit and re-enters the sleep state, and the communication unit is in the duty listening state.

[0013] The beneficial effects brought by the technical solution provided by the embodiment of the present invention are: 1) The UAV wideband interference device can work in coordination within the team. Through the collaborative design of the digital interference signals of multiple UAV wideband interference devices within the team, the power density allocated to the interference frequency band under the condition of constant power is improved, realizing UAV interference in the full frequency and full domain; 2) Utilizing the advantage of flexible design of frequency-domain sub-carriers in multi-carrier modulation, support for frequency-domain comb-shaped spectrum interference is realized. The time-domain baseband interference signal is orthogonally encoded and modulated in the spatial domain through N orthogonal convolutional codewords, without complex time synchronization between multiple UAV wideband interference devices, and the maximum spatial diversity gain can be ensured under the transmission delay distribution from any N UAV wideband interference devices to the UAV to be interfered. At the same time, the N orthogonal convolutional codewords meet the requirement of still obtaining full diversity gain when the number of UAV wideband interference devices is less than N. Description of the Drawings

[0014] Figure 1 It is a schematic diagram of the UAV wideband interference device in the embodiment of the present invention.

[0015] Figure 2 It is a flowchart of the UAV wideband interference method in the embodiment of the present invention.

[0016] Figure 3 It is a schematic diagram of the zero-padding operation in the embodiment of the present invention. Detailed Embodiments

[0017] In order to make the objectives, technical solutions and advantages of the present invention more clearly understood, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0018] In the description of the embodiments of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus cannot be understood as a limitation of the present invention. In addition, the terms "first", "second", and "third" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0019] In the description of the embodiments of the present invention, it should be noted that unless otherwise clearly specified and limited, the terms "installation", "connection", and "connection" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can also be the communication inside two elements. It can be a wireless connection or a wired connection. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0020] In addition, the technical features involved in different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0021] As Figure 1 shown, an embodiment of the present invention provides a distributed team collaborative UAV broadband interference device, including: A main control unit, configured to generate a digital baseband interference signal according to the received UAV wireless signal characteristic data and send it to a radio frequency transceiver, configure the working parameters of the radio frequency transceiver, and control the on / off of the power supply of the radio frequency unit through a power supply unit; In this embodiment, the main control unit sends the generated digital baseband interference signal to the radio frequency transceiver through an LVDS (Low-Voltage Differential Signaling) interface; the main control unit configures the working parameters of the radio frequency transceiver through an SPI (Serial Peripheral Interface) interface; the main control unit controls the on / off of the power supply of the radio frequency unit by connecting the radio frequency power control IO port to the power supply unit through the power supply unit; the main control unit can adopt an ARM multi-core application processor such as Rockchip RK3566 or Allwinner T507; A communication unit, configured to receive the UAV wireless signal feature data detected by the UAV full-frequency detection device within the work team and send it to the main control unit; In this embodiment, the communication unit sends the received UAV wireless signal feature data to the main control unit through a UART (Universal Asynchronous Receiver / Transmitter) interface; specifically, the communication unit can adopt a communication unit based on LoRA (Long Range Radio); A radio frequency unit, including a radio frequency transceiver and at least one transmission channel, where the one transmission channel includes a group of broadband radio frequency power amplifiers and broadband omnidirectional antennas; the radio frequency transceiver is configured to generate a radio frequency interference signal according to the received digital baseband interference signal, amplify the power through the broadband radio frequency power amplifier, and then transmit the radio frequency interference signal through the broadband omnidirectional antenna; Preferably, in order to avoid the problems of too small gain of the broadband omnidirectional antenna and too low efficiency of the broadband power amplifier, and comprehensively consider the volume and weight of the UAV broadband interference device, the radio frequency unit is configured with two groups of broadband radio frequency power amplifiers and broadband omnidirectional antennas, covering the frequency bands of 0 GHz to 4 GHz and 4 GHz to 6 GHz respectively; The radio frequency transceiver can, for example, adopt a radio frequency transceiver with the CX9261A of Chengxin Technology as the core; it integrates functions such as up / down mixers, multi-mode filters, automatic gain control, DC offset cancellation, power detection, digital-to-analog / analog-to-digital converters, driver amplifiers, power management, fractional-N frequency synthesizers, logic control, decimation / interpolation filters, and automatic calibration; the maximum supported baseband bandwidth is 75 MHz; A power supply unit, configured to supply power to the main control unit, the communication unit, and the radio frequency unit; the power supply unit can control the on / off of the power supply of the radio frequency unit; Specifically, the power supply unit includes a lithium-ion battery and a power management chip; the default supply voltage of the lithium-ion battery is 29.4 V, and the battery capacity is 3500 mAH; the power management chip can convert the supply voltage of the lithium-ion battery to the voltages required by the main control unit, the communication unit, the radio frequency unit, etc.; In the team collaborative work mode, one team member in the team can carry the UAV full-frequency detection device, and the other 3 to 5 team members carry the UAV broadband interference devices. The UAV full-frequency detection device communicates with 3 to 5 UAV broadband interference devices through the long-distance broadcast mode of low-power LoRA. The 3 to 5 UAV broadband interference devices automatically generate corresponding radio frequency interference signals according to the detected UAV center frequency point, signal bandwidth, etc. Since multiple UAV broadband interference devices are distributed at different positions, an interference enhancement effect similar to multi-antenna space diversity can be obtained; in addition, the UAV broadband interference device uses an omnidirectional antenna. Compared with the UAV interference gun, the UAV full-frequency detection device does not need to have the UAV direction finding ability, which reduces the design difficulty and cost of the UAV full-frequency detection device.

[0022] As Figure 2 shown, an embodiment of the present invention proposes a distributed team collaborative UAV broadband interference method, including: Step S10, after the distributed team collaborative UAV broadband interference device is turned on, the radio frequency unit is in the off state, the main control unit is in the sleep state, and the communication unit is in the duty listening state; to reduce the overall power consumption of the device; The communication unit continuously waits to receive the alarm information containing the UAV list sent by the UAV full-frequency detection device; the UAV list contains UAV wireless signal feature data; the UAV wireless signal feature data includes the UAV center frequency point and UAV signal bandwidth of each UAV; when the UAV is in the frequency hopping working mode, the UAV wireless signal feature data also includes the frequency hopping time slot. Taking only one UAV as an example below, the distributed team collaborative UAV broadband interference method is described; when the number of UAVs is greater than one and the interval between UAV center frequency points is greater than the maximum baseband frequency width of the radio frequency transceiver (such as 75 MHz) minus the UAV signal bandwidth, the UAV full-frequency detection device needs to perform global scheduling according to the number of UAV broadband interference devices in the team, the center frequency points and signal bandwidths of each UAV, and specify the frequency points and bandwidths responsible for interference by each UAV broadband interference device, which is not within the scope of discussion of this application.

[0023] Step S20, when the communication unit receives the alarm information, it wakes up the main control unit and sends the alarm information to the main control unit. The main control unit turns on the power of the radio frequency unit according to the UAV center frequency point, signal bandwidth and possible frequency hopping time slot in the alarm information, and configures the enabled transmission channel and radio frequency interference signal center frequency point of the radio frequency transceiver. Step S30, the main control unit generates a time-domain baseband interference signal through a baseband modulation process; when the drone is in the frequency hopping working mode and the frequency hopping range of the drone exceeds the maximum baseband bandwidth of the radio frequency transceiver minus the signal bandwidth of the drone (that is, when it is impossible to interfere with all the frequency hopping points of the drone through a single interference signal), each wideband interference device of the drone independently and randomly generates a time-division digital baseband interference signal; at most one digital baseband interference signal with a bandwidth not greater than the maximum baseband bandwidth of the radio frequency transceiver is generated in each time period; The baseband modulation process includes: Step S301, configure the basic bandwidth of the subcarriers according to the current center frequency point and signal bandwidth of the drone to be interfered; generate a pseudo-noise code using the m-sequence with the same starting phase and then perform binary phase shift keying (BPSK) modulation to generate a frequency-domain baseband interference signal; the generated frequency-domain baseband interference signal should be larger than the signal bandwidth of the drone by an extended bandwidth; each subcarrier in the frequency-domain baseband interference signal carries a BPSK modulation symbol; Taking the drone signal bandwidth of 20 MHz as an example, assuming the basic bandwidth of the subcarrier is 100 kHz, the generated frequency-domain baseband interference signal is larger than the drone signal bandwidth by an extended bandwidth of 400 kHz; then the generated frequency-domain baseband interference signal contains (20 MHz + 400 kHz) / 100 kHz = 204 subcarriers; the reason for setting the extended bandwidth is to consider the offset between the actual center frequency point of the drone caused by the Doppler frequency shift generated by the rapid flight of the drone and the center frequency point detected by the full-frequency detection device of the drone, as well as the possible frequency drift caused by the temperature change of its own radio frequency devices; Step S302, when the drone is in the frequency hopping working mode, for each frequency hopping point, generate the frequency-domain baseband interference signal of each frequency hopping point according to the method of Step S301; The signal bandwidth of the drone's frequency hopping points may be only 2 MHz; This step realizes frequency-domain comb-shaped spectrum interference according to the frequency hopping time slots of the drone's wireless communication, which can improve the power spectral density of the interference signal; Step S303, for one or more frequency-domain baseband interference signals generated in the above steps; perform zero-padding operation in the frequency domain for the frequency bands that do not need to be interfered (that is, add empty subcarriers) to obtain multiple subcarriers with a bandwidth of the basic bandwidth, and perform zero-padding operation in the frequency domain respectively below the lowest frequency band and above the highest frequency band of the overall of all frequency-domain baseband interference signals to obtain b = m * 2 n subcarriers; then perform the inverse fast Fourier transform (IFFT) of b points to convert one or more frequency-domain baseband interference signals into a time-domain baseband interference signal; m ≥ 1, n ≥ 1, both are natural numbers; When the drone is not in the frequency hopping working mode, a frequency-domain baseband interference signal is generated, and then zero-padding operations are performed respectively below the lowest frequency band and above the highest frequency band of the frequency-domain baseband interference signal to obtain b = m * 2 n sub-carriers; When the drone is in the frequency hopping working mode, multiple frequency-domain baseband interference signals are generated. First, zero-padding operations are performed in the frequency bands without interference between the frequency-domain baseband interference signals; then zero-padding operations are performed respectively below the lowest frequency band and above the highest frequency band of all the multiple frequency-domain baseband interference signals as a whole to obtain b = m * 2 n sub-carriers; In one embodiment, the drone is in the frequency hopping working mode. First, zero-padding operations are performed in the frequency bands without interference between the frequency-domain baseband interference signals to obtain 750 sub-carriers with a bandwidth of 100 KHz; then zero-padding operations are performed respectively below the lowest frequency band and above the highest frequency band of all the multiple frequency-domain baseband interference signals as a whole, that is, 9 empty sub-carriers are filled respectively below the lowest frequency band and above the highest frequency band to obtain 768 sub-carriers, that is, 3 * 2 8 sub-carriers; as Figure 3 shown; Step S304, perform convolution on the time-domain baseband interference signal and the N orthogonal convolution codewords to complete spatial orthogonal coding modulation, and obtain a digital baseband interference signal; to achieve the maximum spatial diversity gain; Since there is no time synchronization and there are frequency deviations among the drone wideband interference devices, and at the same time the distances from the interfered drones are also different, and the interference signals of multiple drone wideband interference devices can obtain the maximum spatial diversity gain under orthogonal conditions, that is, the most efficient interference; There are N groups of codewords in the N orthogonal convolution codewords, and N represents the possible maximum number of drone wideband interference devices in the group; the length of each group of codewords is L, and L = 1 + 2x(2 N-1 -1); In a specific embodiment, the N orthogonal convolution codewords with N = 3 and L = 7 are respectively: [1, 0, 0, 0, 0, 0, 0], , 0, , 0, 0, 0, 0], and , 0, , 0, , 0, ; Step S305, perform raised cosine roll-off shaping low-pass filtering on the digital baseband interference signal; Performing raised cosine roll-off shaping low-pass filtering on the digital baseband interference signal can eliminate inter-symbol interference in the time domain; The raised cosine roll-off factor during the raised cosine roll-off shaping low-pass filtering is selected as 0.25; Step S40: The main control unit sends the generated digital baseband interference signal to the radio frequency transceiver; after being subjected to FIR (Finite Impulse Response) filtering and digital-to-analog conversion by the radio frequency transceiver, the digital baseband interference signal is mixed to a specified center frequency point to obtain a radio frequency interference signal, which is power-amplified by a broadband radio frequency power amplifier and then transmitted through a broadband omnidirectional antenna. Step S50: After the interference by the radio frequency interference signal exceeds the specified interference time, the main control unit turns off the radio frequency unit and re-enters the sleep state, and the communication unit is in the duty listening state; to reduce the overall power consumption of the device.

[0024] Finally, it should be noted that the above specific embodiments are only used to illustrate the technical solutions of the present invention rather than to limit them. Although the present invention has been described in detail with reference to the embodiments, those of ordinary skill in the art should understand that the technical solutions of the present invention can be modified or equivalently replaced without departing from the spirit and scope of the technical solutions of the present invention, and they should all be covered within the scope of the claims of the present invention..

Claims

1. A distributed team-coordinated UAV broadband jamming device, characterized in that: include: The main control unit is used to generate a digital baseband interference signal based on the received drone wireless signal characteristic data and send it to the RF transceiver, and to configure the working parameters of the RF transceiver, and to control the opening and closing of the RF unit power supply through the power supply unit; The communication unit is used to receive the wireless signal characteristic data of the drone detected by the drone full-frequency detection equipment in the team and send it to the main control unit; The radio frequency unit includes a radio frequency transceiver and at least one transmission channel, wherein the transmission channel includes a set of broadband radio frequency power amplifiers and broadband omnidirectional antennas; the radio frequency transceiver is used to generate a radio frequency interference signal according to the received digital baseband interference signal, amplify the power through the broadband radio frequency power amplifier, and then transmit the radio frequency interference signal through the broadband omnidirectional antenna; The power supply unit is used to supply power to the main control unit, the communication unit and the radio frequency unit; the power supply unit can control the opening and closing of the radio frequency unit power supply.

2. The distributed team cooperative UAV broadband jamming device as claimed in claim 1, characterized in that: The main control unit sends the generated digital baseband interference signal to the RF transceiver through the LVDS interface; the main control unit configures the working parameters of the RF transceiver through the SPI interface; the main control unit is connected to the power supply unit through the RF power control IO port and controls the opening and closing of the RF unit power through the power supply unit.

3. The distributed team cooperative UAV broadband jamming device as claimed in claim 1, characterized in that: The radio frequency unit is configured with two sets of broadband radio frequency power amplifiers and broadband omnidirectional antennas, covering the 0GHz to 4GHz and 4GHz to 6GHz frequency bands respectively.

4. A distributed team cooperative UAV broadband jamming method, applicable to the distributed team cooperative UAV broadband jamming device as described in any one of claims 1 to 3, characterized in that: include: Step S10, after the distributed team cooperative UAV broadband jamming device is turned on, the radio frequency unit is in a closed state, the main control unit is in a dormant state, and the communication unit is in a guard listening state; The communication unit continuously waits to receive an alarm message including a drone list sent by a drone full-frequency detection device; the drone list includes drone wireless signal characteristic data; the drone wireless signal characteristic data includes a drone center frequency point and a drone signal bandwidth of each drone; Step S20, when the communication unit receives the alarm information, it wakes up the main control unit and sends the alarm information to the main control unit. The main control unit turns on the power of the RF unit according to the center frequency, signal bandwidth and possible frequency hopping time slot of each drone in the alarm information, and configures the enabled transmission channel of the RF transceiver and the center frequency of the RF interference signal; Step S30, the main control unit generates a time domain baseband interference signal through a baseband modulation process; specifically comprising: Step S301, according to the current center frequency point and signal bandwidth of the drone to be interfered, configure the basic bandwidth of the subcarrier; use the same starting phase m sequence to generate a pseudo-noise code and then perform binary phase shift keying BPSK modulation to generate a frequency domain baseband interference signal; the generated frequency domain baseband interference signal should be one extended bandwidth larger than the drone signal bandwidth; each subcarrier in the frequency domain baseband interference signal carries a BPSK modulation symbol; Step S303: for one or more frequency domain baseband interference signals generated in the above steps, frequency domain zero padding operation is performed in the frequency band where interference is not required to obtain multiple subcarriers with bandwidth as the basic bandwidth, and frequency domain zero padding operation is performed below the lowest frequency band and above the highest frequency band of all frequency domain baseband interference signals as a whole, respectively, to obtain b=m*2 n subcarriers; then perform an inverse fast Fourier transform IFFT at point b to convert one or more frequency domain baseband interference signals into a time domain baseband interference signal; Step S304, convolving the time domain baseband interference signal with N orthogonal convolution codewords to complete spatial domain orthogonal coding modulation to obtain a digital baseband interference signal; Step S305, low-pass filtering the digital baseband interference signal; In step S40, the main control unit sends the generated digital baseband interference signal to the RF transceiver; after the digital baseband interference signal is FIR filtered and digital-to-analog converted by the RF transceiver, it is mixed to the specified center frequency to obtain the RF interference signal, and the RF interference signal is power amplified by a wideband RF power amplifier and then transmitted by a wideband omnidirectional antenna.

5. The distributed team cooperative UAV broadband jamming method as claimed in claim 4, characterized in that: When the drone is in frequency hopping working mode; The drone wireless signal characteristic data in step S10 also includes a frequency hopping time slot; In step S30, when the drone is in the frequency hopping working mode and the frequency hopping range of the drone exceeds the maximum baseband bandwidth of the RF transceiver minus the drone signal bandwidth, each drone broadband jammer autonomously and randomly generates a time-divided digital baseband jammer signal; At most one digital baseband interference signal with a bandwidth no greater than the maximum baseband bandwidth of the RF transceiver is generated in each time period; Also included between step S301 and step S303: Step S302: When the UAV is in the frequency hopping working mode, a frequency domain baseband interference signal of each frequency hopping frequency is generated according to the method of step S301 for each frequency hopping frequency.

6. The distributed team cooperative UAV broadband jamming method as claimed in claim 5, characterized in that: When the drone is not in frequency hopping mode, a frequency domain baseband interference signal is generated. Then, frequency domain zero padding operations are performed below the lowest frequency band and above the highest frequency band of the frequency domain baseband interference signal to obtain b=m*2 n subcarriers; When the drone is in frequency hopping mode, multiple frequency domain baseband interference signals are generated. First, frequency domain zero padding is performed in the frequency bands where no interference is required between the frequency domain baseband interference signals. Then, frequency domain zero padding is performed below the lowest frequency band and above the highest frequency band of all the multiple frequency domain baseband interference signals to obtain b=m*2. n subcarriers.

7. The distributed team cooperative UAV broadband jamming method as claimed in claim 4, characterized in that: In step S305, a raised cosine roll-off shaping low-pass filter is performed on the digital baseband interference signal.

8. The distributed team cooperative UAV broadband jamming method as claimed in claim 4, characterized in that: After step S40, the following steps are also included: Step S50, after the interference by the radio frequency interference signal exceeds the specified interference time, the main control unit turns off the radio frequency unit and re-enters the sleep state, and the communication unit is in the on-duty listening state.

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