A waveform modulation method and system for electromagnetic pulse combination effect

Abstract

This invention provides a waveform modulation method and system for electromagnetic pulse combination effects. The method involves acquiring the remote control communication frequency and flight status information of a UAV; setting electromagnetic pulse parameters and radiated power; generating an interference modulation waveform based on the electromagnetic pulse parameters using an interference waveform generation strategy; the carrier frequency of the interference modulation waveform being the same as or adjacent to the remote control communication frequency, and the pulse sequence of the interference modulation waveform having repetitive pulses including random jitter of repetition frequency and / or random alternation of positive and negative polarities; and transmitting electromagnetic pulses to the UAV with the required effective radiated power based on the interference modulation waveform to achieve a front-and-back door combination effect. The interference modulation waveform generated by this invention has the characteristics of being the same as or adjacent to the remote control communication frequency, and having repetitive pulses with random jitter of repetition frequency and / or random alternation of positive and negative polarities, which can generate a front-and-back door combination effect with relatively low transmission power, improving operational effectiveness.

Description

Technical Field

[0001] This invention relates to the field of high-power electromagnetic effects technology, specifically to a waveform modulation method and system for electromagnetic pulse combination effects. Background Technology

[0002] Jamming methods against drones mainly focus on communication link disruption and GPS (Global Positioning System) spoofing, which have a certain effect in deterring and preventing dangerous drone approaches, but are difficult to effectively damage and disable their functions. In recent years, high-power electromagnetic pulse technology has developed rapidly, possessing characteristics such as long-range radiation, instantaneous paralysis, and strong penetration capabilities. It can couple into the internal circuits of electronic devices, causing logical disorder, functional failure, and even hardware damage, becoming an important means of new electronic warfare and anti-drone systems.

[0003] Currently, high-power electromagnetic pulse weapons are all designed to cause breakdown, short circuits, or thermal damage to control circuits or devices. To achieve an effective range of 2 kilometers, for example, a synthesis of at least 10... 14 Effective pulse peak power of watts, that is, the system pulse peak power source is required to be up to hundreds of megawatts (10 8 W), and the transmitting antenna (array) should have a noise level of 60 dB (10). 6 With gains of more than 10 times, and given the requirement of extremely high power, the corresponding structural complexity, size, and weight of the system are also very large, resulting in lower operational effectiveness. Summary of the Invention

[0004] To overcome the shortcomings of current UAV jamming methods, which require extremely high power and thus have low operational effectiveness, this invention provides a waveform modulation method based on electromagnetic pulse combination effects, comprising:

[0005] Acquire the remote control communication frequency and flight status information of the drone;

[0006] Based on the remote control communication frequency, set the electromagnetic pulse parameters; based on the flight status information, set the electromagnetic pulse radiation power.

[0007] Based on the electromagnetic pulse parameters, an interference modulation waveform is generated using an interference waveform generation strategy; the carrier frequency of the interference modulation waveform is the same as or adjacent to the remote control communication frequency, and the pulse sequence of the interference modulation waveform has repetitive pulses including random jitter of repetition frequency and / or random alternation of positive and negative polarity.

[0008] Based on the interference modulation waveform, an electromagnetic pulse is emitted towards the UAV with the effective radiated power to interfere with the UAV's communication receiver through the front door path, and simultaneously induce logic level flipping by coupling to the UAV's flight control circuit through the rear door path.

[0009] Optionally, the repetition frequency of the repetitive pulse has a random jitter amplitude of 10%-20%.

[0010] Optionally, the pulse width of the interference modulation waveform is 1μs to 10μs, the duty cycle is 30% to 60%, and the basic value of the pulse repetition frequency is in the range of 100Hz to 1MHz.

[0011] Optionally, setting the radiated power of the electromagnetic pulse based on the flight state information includes:

[0012] Based on the distance data in the flight status information, the radiation power of the electromagnetic pulse is dynamically adjusted according to the inverse square relationship of the distance.

[0013] If the distance data is 1 km, then the effective radiated power ranges from 10. 5 W-10 8 W.

[0014] Optionally, the step of generating an interference modulation waveform based on the electromagnetic pulse parameters using an interference waveform generation strategy includes:

[0015] Based on the electromagnetic pulse parameters, pulse groups are generated.

[0016] Based on the principle of synchronizing the sequence update rate with the pulse repetition frequency, a linear feedback shift register or a cryptographically secure pseudo-random number generator is used to generate a binary pseudo-random sequence.

[0017] Based on each pulse in the pulse group, using the polarity mapping rule, a binary value is read from the binary pseudo-random sequence as the polarity of the pulse to obtain a polarized pulse signal;

[0018] A balanced modulator is used to reverse the phase of each polarity pulse signal to generate an interference modulation waveform.

[0019] Optionally, the interference modulation waveform satisfies the following formula:

[0020]

[0021] in, To interfere with the modulated waveform, Let n be the amplitude of the nth pulse. For carrier frequency, Let n be the initial phase of the nth pulse. If it is positive polarity; if If , then it is negative polarity; t is time, and T is the pulse repetition period, which is related to the pulse repetition frequency. For pulse width, Π( ) is a rectangular window function.

[0022] Optionally, if the drone is located in a drone swarm, and the drone swarm consists of multiple drones operating on the same frequency band, then before generating the interference modulation waveform based on the electromagnetic pulse parameters using the interference waveform generation strategy, the method further includes:

[0023] Based on the remote control communication frequencies and flight status information of multiple UAVs, a spectrum-space joint clustering analysis algorithm is used to obtain clustering results, which include UAV swarms and the dominant communication frequencies of the UAV swarms.

[0024] Based on the clustering results, the antenna beam operating mode is switched to low-gain wide-beam mode.

[0025] All transmission channels are synchronously locked to the dominant communication frequency to generate an interference modulation waveform with the same carrier frequency for each drone in the drone swarm.

[0026] The step of transmitting an electromagnetic pulse to the UAV with the effective radiated power based on the interference modulation waveform includes:

[0027] Based on the interference modulation waveform of each UAV, in the low-gain wide-beam mode, with the effective radiated power, all transmission channels are controlled to radiate electromagnetic pulses into the airspace where the UAV swarm is located in a synchronous sequence, so that each UAV in the UAV swarm is simultaneously subjected to front door path interference and back door path interference.

[0028] On the other hand, the present invention also provides a waveform modulation system for electromagnetic pulse combination effects, comprising:

[0029] The acquisition module is used to acquire the remote control communication frequency and flight status information of the UAV;

[0030] The parameter setting module is used to set electromagnetic pulse parameters based on the remote control communication frequency and to set the radiated power of the electromagnetic pulse based on the flight status information.

[0031] The waveform generation module is used to generate an interference modulation waveform based on the electromagnetic pulse parameters and using an interference waveform generation strategy; the carrier frequency of the interference modulation waveform is the same as or adjacent to the remote control communication frequency, and the pulse sequence of the interference modulation waveform has repetitive pulses including random jitter of repetition frequency and / or random alternation of positive and negative polarity;

[0032] The interference module is used to transmit electromagnetic pulses to the UAV with the effective radiated power based on the interference modulation waveform, for interfering with the UAV's communication receiver through the front door path, and simultaneously inducing level flipping by coupling to the UAV's flight control circuit through the rear door path.

[0033] Optionally, the repetition frequency of the repetitive pulse has a random jitter amplitude of 10%-20%.

[0034] Optionally, the pulse width of the interference modulation waveform is 1 μs to 10 μs, the duty cycle is 30% to 60%, and the basic value of the pulse repetition frequency is in the range of 100 Hz to 1 MHz.

[0035] Optionally, the parameter setting module is specifically used for:

[0036] Based on the distance data in the flight status information, the radiation power of the electromagnetic pulse is dynamically adjusted according to the inverse square relationship of the distance.

[0037] If the distance data is 1 km, then the range of the radiated power is 10. 5 W-10 8 W.

[0038] Optionally, the waveform generation module is specifically used for:

[0039] Based on the electromagnetic pulse parameters, pulse groups are generated.

[0040] Based on the principle of synchronizing the sequence update rate with the pulse repetition frequency, a linear feedback shift register or a cryptographically secure pseudo-random number generator is used to generate a binary pseudo-random sequence.

[0041] Based on each pulse in the pulse group, using the polarity mapping rule, a binary value is read from the binary pseudo-random sequence as the polarity of the pulse to obtain a polarized pulse signal;

[0042] A balanced modulator is used to reverse the phase of each polarity pulse signal to generate an interference modulation waveform.

[0043] Optionally, the interference modulation waveform satisfies the following formula:

[0044]

[0045] in, To interfere with the modulated waveform, Let n be the amplitude of the nth pulse. For carrier frequency, Let n be the initial phase of the nth pulse. If it is positive polarity; if If , then it is negative polarity; t is time, and T is the pulse repetition period, which is related to the pulse repetition frequency. For pulse width, Π( ) is a rectangular window function.

[0046] Optionally, if the drone is located in a drone swarm, and the drone swarm consists of multiple drones operating on the same frequency band, then the parameter setting module is further configured to:

[0047] Based on the remote control communication frequencies and flight status information of multiple UAVs, a spectrum-space joint clustering analysis algorithm is used to obtain clustering results, which include UAV swarms and the dominant communication frequencies of the UAV swarms.

[0048] Based on the clustering results, the antenna beam operating mode is switched to low-gain wide-beam mode.

[0049] All transmission channels are synchronously locked to the dominant communication frequency to generate an interference modulation waveform with the same carrier frequency for each drone in the drone swarm.

[0050] The interference module is specifically used for:

[0051] Based on the interference modulation waveform of each UAV, in the low-gain wide-beam mode, with the effective radiated power, all transmission channels are controlled to radiate electromagnetic pulses into the airspace where the UAV swarm is located in a synchronous sequence, so that each UAV in the UAV swarm is simultaneously subjected to front door path interference and back door path interference.

[0052] On the other hand, the present invention also provides a computer device, characterized in that it includes: one or more processors;

[0053] The processor is used to store one or more programs;

[0054] When the one or more programs are executed by the one or more processors, the waveform modulation method for electromagnetic pulse combination effect described in any one of the above is implemented.

[0055] On the other hand, the present invention also provides a computer-readable storage medium, characterized in that it stores a computer program thereon, wherein when the computer program is executed, it implements the waveform modulation method of electromagnetic pulse combination effect as described in any one of the above.

[0056] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0057] This invention provides a waveform modulation method and system for electromagnetic pulse combination effects. The method involves acquiring the remote control communication frequency and flight status information of a UAV; setting electromagnetic pulse parameters based on the remote control communication frequency; setting the radiated power of the electromagnetic pulse based on the flight status information; generating an interference modulation waveform based on the electromagnetic pulse parameters using an interference waveform generation strategy; the carrier frequency of the interference modulation waveform being the same as or adjacent to the remote control communication frequency, and the pulse sequence of the interference modulation waveform having repetitive pulses including random jitter of the repetition frequency and / or random alternation of positive and negative polarities; and transmitting electromagnetic pulses to the UAV at radiated power based on the interference modulation waveform to interfere with the UAV's communication receiver through a front-door path, while simultaneously inducing logic level flips by coupling to the UAV's flight control circuit through a back-door path. The interference modulation waveform generated by this invention has the characteristics of being the same as or adjacent to the remote control communication frequency, and having repetitive pulses with random jitter of the repetition frequency and / or random alternation of positive and negative polarities. It can generate a front-door and back-door combination effect at relatively low transmission power, thus reducing the system's structural complexity, size, and weight, and improving operational effectiveness. Attached Figure Description

[0058] Figure 1 This is a schematic flowchart of the waveform modulation method for the electromagnetic pulse combination effect of the present invention;

[0059] Figure 2 This is a schematic diagram of the high-power electromagnetic pulse transmission system of the present invention;

[0060] Figure 3 This is a schematic diagram of the "flip" principle of the single transient electromagnetic pulse logic of the present invention;

[0061] Figure 4 This is a schematic diagram of the modulation waveform with pulse repetition frequency jitter characteristics according to the present invention;

[0062] Figure 5 This is a schematic diagram of the modulation waveform of the present invention, which has randomly varying pulse polarity and repetition frequency.

[0063] Figure 6 This is a schematic diagram of the "front door" / "back door" coupling path of the present invention;

[0064] Figure 7 This is a graph showing the abnormal response of the UAV flight control circuit of the present invention after interference. Detailed Implementation

[0065] The specific embodiments of the present invention will be further described in detail below with reference to the accompanying drawings.

[0066] Example 1:

[0067] The present invention provides a waveform modulation method for electromagnetic pulse combination effects, as follows: Figure 1As shown, it includes:

[0068] Step 101: Obtain the remote control communication frequency and flight status information of the UAV;

[0069] Step 102: Based on the remote control communication frequency, set the electromagnetic pulse parameters; based on the flight status information, set the electromagnetic pulse radiation power;

[0070] Step 103: Based on the electromagnetic pulse parameters, generate an interference modulation waveform using an interference waveform generation strategy; the carrier frequency of the interference modulation waveform is the same as or adjacent to the remote control communication frequency, and the pulse sequence of the interference modulation waveform has repetitive pulses including random jitter of repetition frequency and / or random alternation of positive and negative polarity.

[0071] Step 104: Based on the interference modulation waveform, emit electromagnetic pulses to the UAV with radiated power to interfere with the UAV's communication receiver through the front door path, and simultaneously couple to the UAV's flight control circuit through the rear door path to induce logic level flipping.

[0072] The interference modulation waveform generated in this embodiment of the invention has the characteristics of being the same as or adjacent to the remote control communication frequency, and repetitive pulses with random jitter of repetition frequency and / or random alternation of positive and negative polarity. It can generate front and back gate combination effects at relatively low transmission power, thus reducing the structural complexity, size and weight of the system and improving combat effectiveness.

[0073] The waveform modulation method for electromagnetic pulse combination effects provided in this invention can be applied to electronic devices, such as drone jamming devices. The specific type of drone jamming device used can be selected depending on the scenario and is not limited here. Alternatively, the electronic device can be a dedicated waveform modulation device that can drive the drone jamming device to interfere with drones. Or, the waveform modulation method for electromagnetic pulse combination effects provided in this invention can be applied to drone jamming systems, such as... Figure 2 As shown, the UAV jamming system typically generates a carrier signal from a signal source, then performs pulse modulation using the method shown in this scheme to obtain a pulse-modulated waveform, which is then amplified by a power amplifier group to achieve sufficient signal strength to achieve radiated jamming. The amplified jamming signal is radiated into space through a transmitting antenna array, thereby achieving combined front and rear door jamming of the target UAV.

[0074] In step 101 above, the remote control communication frequency of the UAV refers to the uplink remote control frequency band of the UAV. For example, by using radio detection equipment to obtain the target spectrum characteristics of the UAV, and performing FFT (Fast Fourier Transform) analysis on the target spectrum characteristics, the remote control communication frequency can be extracted. The flight status information of the UAV can be obtained through radar detection systems and / or photoelectric tracking equipment. For example, flight status information includes the UAV's distance, speed, azimuth, and altitude, as well as optical images of the UAV.

[0075] In one implementation, based on the information obtained in step 101, the friend or foe attribute of the UAV is determined, i.e., whether the UAV is authorized. For example, it is determined whether the remote control communication frequency of the UAV is in the authorized UAV database. If it is, the UAV is authorized and considered to be a friendly UAV; if not, the UAV is not authorized and considered to be a hostile UAV. Alternatively, by analyzing the flight behavior of the UAV through flight status information, if the analysis results show that the UAV has entered a preset no-fly zone or is flying with an abnormal trajectory, the UAV is considered unauthorized; otherwise, the UAV is considered authorized. In this implementation, the friend or foe attribute of the UAV can be one of the conditions for triggering jamming measures: when the UAV is unauthorized, a strike decision is made. When the decision is to use high-power electromagnetic pulse strike measures, subsequent steps can continue.

[0076] Electromagnetic pulse parameters include information such as the carrier frequency, pulse width, and pulse repetition frequency of the interference modulation waveform to ensure that the electromagnetic pulse can effectively enter the UAV communication receiver through the front door path. For example, based on the results of sufficient target electromagnetic pulse effect tests, a mapping table between different communication frequencies and these parameters can be pre-stored; then, in step 102, the corresponding electromagnetic pulse parameters are set by looking up the corresponding electromagnetic pulse parameters in the mapping table based on the UAV's remote control communication frequency. For example, but not limited to: the carrier frequency range is 0.8GHz-6GHz, such as 915MHz (megahertz), 2.4GHz, 5.8GHz, etc.; the pulse width of the interference modulation waveform is 1μs (microseconds) to 10μs, the duty cycle is 30% to 60%, and the basic value of the pulse repetition frequency is in the range of 100 Hz (hertz) to 1 MHz.

[0077] The carrier frequency range is determined based on a comprehensive consideration of various factors, including UAV communication systems, electromagnetic propagation characteristics, antenna engineering feasibility, and coupling efficiency. For example, 915MHz is primarily suitable for industrial / long-endurance UAVs, offering strong penetration and good diffraction capabilities, making it suitable for long-range remote control links in urban or complex terrain environments; transmitting high-power signals at this frequency can effectively block uplink control commands. 2.4GHz is mainly suitable for the mainstream remote control frequency band of consumer UAVs, used by the vast majority of consumer UAVs by default; jamming in this band can cover the largest number of targets, achieving "broad-spectrum strikes." 5.8GHz is mainly suitable for high-definition image transmission or backup remote control links (such as racing UAVs and high-end models), offering large bandwidth and strong anti-interference capabilities, but with high propagation loss; jamming in this band can cut off high-definition video transmission or backup control channels, forcing UAVs to return home or become uncontrollable. Therefore, it can improve the ability to target various UAVs, including unknown or frequency-hopping UAVs.

[0078] For example, when the pulse width of the interference modulation waveform is between 1μs and 10μs, a wider pulse width ensures that more energy is injected into the system within each pulse cycle, which helps overcome transmission path losses and improves backdoor path coupling efficiency. Narrower pulses generate a wider spectrum, covering more potential target frequency bands, and wider pulses can increase peak power, making interference more effective within specific frequency bands. Furthermore, a duty cycle of 30% to 60% ensures a balance between power density and thermal effects. Specifically, an appropriate duty cycle ensures sufficient interference energy while avoiding overheating of the device itself due to excessive average power, and reduces the risk of accidental damage to non-target devices. Within this range, a higher duty cycle means longer continuous interference, helping to maintain the target UAV's erroneous state; a lower duty cycle may give the target a brief recovery opportunity, forming an intermittent interference mode and further disrupting its normal operation.

[0079] For example, when the base value of the pulse repetition frequency is in the range of 100Hz to 1MHz, it can adapt to different distances and application scenarios, as well as match the target's response characteristics. Specifically, the low-frequency end (such as 100Hz) is suitable for long-range interference scenarios to reduce system power consumption and expand the effective range; the high-frequency end (such as 1MHz) is suitable for close-range precision strikes to ensure rapid and dense energy injection, thus adapting to different distances and application scenarios. According to the physical size, structural layout, and sensitive frequency band of the target device, selecting an appropriate pulse repetition frequency can maximize the triggering of the transient response of the target's internal components, such as parasitic oscillations, voltage collapse, or logic disorder, thereby achieving the purpose of matching the target's response characteristics.

[0080] In one implementation, the radiated power of the electromagnetic pulse can be estimated based on the required operating distance. For example, using a free-space path loss model, the radiated power can be dynamically calculated and set to ensure that the backdoor coupling scenario is sufficient to induce circuit logic reversal. For instance, the power is proportional to the square of the distance. In step 103, based on the distance data in the flight status information, the radiated power of the electromagnetic pulse can be dynamically adjusted according to the inverse square relationship of the distance. For example, but not limited to: if the distance data is 1 km, then the effective radiated power ranges from 10... 5 W (W)-10 8 W. This example ensures that the coupling field strength at the UAV target remains within the effective interference range at any distance, avoiding resource waste, reducing heat load, and preventing safety risks caused by accidental damage to neighboring equipment. Furthermore, by combining distance-adaptive power control with the front / rear door effect, the effective radiated power requirement at a 1km range is reduced to 10. 5 W-10 8 W allows the system to be implemented using solid-state amplifiers combined with medium-gain antennas, supporting vehicle-mounted, shipborne, and even portable deployments, while also limiting it to 10 5 W-10 8 Within the W range, avoid causing damage to the interference system itself.

[0081] In the interference modulation waveform generated in step 103 above, the repetition frequency of the repetitive pulse can be randomly jittered by 10%-20%.

[0082] The interference modulation waveform generated in step 103 above has the following characteristics:

[0083] Random pulse repetition frequency jitter: The pulse repetition frequency is randomly varied within a certain range to increase the probability of generating various electromagnetic pulse effects;

[0084] Repetitive pulses with random alternation of positive and negative polarities: The polarity of electromagnetic pulses alternates randomly to increase the probability of generating high and low level "flips" in digital logic circuits;

[0085] Electromagnetic pulse repetition frequency jitter is generated by the combination of pulse polarity;

[0086] Setting the electromagnetic pulse transmission carrier frequency to be the same as or adjacent to the UAV remote control communication frequency allows a high-power radio frequency signal to enter the communication receiver's receiving channel, blocking or burning out the receiver front end and causing it to lose its communication function. "Adjacent to the UAV remote control communication frequency" can be understood as: the carrier frequency differs from the remote control communication frequency by a small frequency offset (e.g., within 1 to 3 times the receiver channel bandwidth; this value is an example and can be adjusted or selected according to actual conditions), or the carrier frequency is located in an adjacent channel (e.g., ±5 MHz; this value is an example and can be adjusted or selected according to actual conditions) or within a nearby frequency band of the remote control communication frequency.

[0087] The interference waveform with this feature generates a reversal effect on the UAV flight control logic circuit by using a random alternation of positive and negative pulses with pulse repetition frequency jitter, thereby improving the interference efficiency; it uses a carrier frequency that is consistent with or adjacent to the UAV remote control communication frequency to generate a combined effect of front door interference and back door interference, thereby enhancing the interference effect; and it achieves a dual synergistic interference effect by acting on both the front door and back door of the UAV at the same time.

[0088] In one implementation, a pseudo-random sequence and synchronization mechanism can be introduced in step 103 above to ensure the reproducibility and controllability of the "random" process, thereby improving its reliability. For example, in step 103, a pulse group can be generated based on electromagnetic pulse parameters; according to the principle of synchronizing the sequence update rate with the pulse repetition frequency, a binary pseudo-random sequence can be generated using an LFSR (Linear Feedback Shift Register) or a secure PRNG (pseudo-random number generator); based on each pulse in the pulse group, using a polarity mapping rule, one bit of binary value is read from the binary pseudo-random sequence as the pulse polarity to obtain a polarized pulse signal; a balanced modulator is used to invert the phase of each polarized pulse signal to generate an interference modulation waveform. In this example... First, a binary pseudo-random sequence is generated using an LFSR or a secure PRNG, synchronized with the pulse repetition frequency. Then, for each pulse to be transmitted, one bit of binary value is read from the sequence, and the polarity of the pulse is determined according to a preset polarity mapping rule (e.g., "0" corresponds to positive polarity, and "1" corresponds to negative polarity). Finally, this polarity instruction is sent to a balanced modulator, which controls the phase of the radio frequency carrier (0° or 180°) to achieve an equivalent positive / negative polarity output, thereby generating an interference modulation waveform with random polarity alternation.

[0089] The interference modulation waveform can satisfy the following formula:

[0090]

[0091] in, The interference modulation waveform refers to the electromagnetic pulse waveform emitted at time t. Let n be the amplitude of the nth pulse. The carrier frequency affects front door blocking. Let n be the initial phase of the nth pulse. If it is positive polarity; if If the polarity is negative, it is controlled by a pseudo-random sequence, affecting the backdoor logic reversal probability; t is time, T is the pulse repetition period, which is related to the pulse repetition frequency, for example... , The pulse repetition frequency (with ±10% to ±20% random jitter introduced to enhance the interference effect) can be broken by altering the periodicity to avoid being suppressed by the filter. The pulse width affects energy injection efficiency and circuit response. Π( ) is a rectangular window function. This formula describes an electromagnetic signal of a periodic repetitive pulse sequence, where each pulse is a cosine wave of the carrier frequency, and its amplitude and phase vary with the pulse number. It can realize the "front / back gate combination effect" in high-power electromagnetic pulse interference.

[0092] In this embodiment of the invention, the positive and negative polarities of the repetitive pulses alternate randomly, which can generate a single repetitive pulse with alternating positive and negative polarities, or it can generate a modulated waveform combined with random jitter of the pulse repetition frequency.

[0093] To address drone swarms, this invention also proposes a dynamic beam adjustment combined with a synchronous radiation strategy to overcome the limitations of traditional narrow beam single-target targeting and achieve wide-area coverage combined interference against swarm targets.

[0094] In one implementation, if the drone is located in a drone swarm, and the drone swarm consists of multiple drones in the same frequency band, then before step 103 above, a spectrum-space joint clustering analysis algorithm can be used to obtain clustering results based on the remote control communication frequencies and flight status information of multiple drones. The clustering results include the drone swarm and the dominant communication frequency of the drone swarm. Based on the clustering results, the antenna beam operating mode is switched to low-gain wide-beam mode. All transmission channels are synchronously locked to the dominant communication frequency to generate an interference modulation waveform with the same carrier frequency for each drone in the drone swarm.

[0095] For example, a multi-dimensional feature vector can be constructed based on the remote control communication frequencies and flight status information of multiple drones. An improved DBSCAN clustering algorithm (a density-based clustering algorithm) is used, employing a spectrum-space joint clustering analysis algorithm. Frequency proximity thresholds and spatial distance thresholds are set, and then the spectrum-space joint clustering analysis algorithm performs clustering to obtain the clustering results of the drone swarm. If a drone swarm exists within the clustering results where the number of drones exceeds a set threshold and the dominant frequency is concentrated within a set sub-frequency band, then that drone swarm is considered the target swarm. This example uses a combination of spectrum similarity and spatial clustering for swarm decision-making, which can avoid misjudging isolated frequency-hopping drones.

[0096] When switching to low-gain wide-beam mode, any of the following implementation methods can be used:

[0097] (a) Subarray activation mode: Only the subarray elements in the central region are enabled (e.g., a 4×4 subarray replaces the 16×16 full array), the gain is reduced to 25 dB, and the beamwidth is widened to 15°;

[0098] (b) Phase perturbation injection: Random phase perturbation is superimposed on the beamforming weights to artificially widen the main lobe;

[0099] (c) Mechanical + Electronic Hybrid Scanning: The antenna platform is activated by slight vibration (e.g., ±7.5°) in conjunction with electronic scanning to form a "virtual wide beam". These methods are not simply about changing the antenna, but rather about achieving adaptive switching between narrow-beam precision strikes and wide-beam scattering strikes on the same hardware.

[0100] Each drone in the drone swarm generates an interference modulation waveform with the same carrier frequency, specifically including alternating polarity and identical frequency jitter.

[0101] Accordingly, in step 104 above, based on the interference modulation waveform of each UAV, in low-gain wide-beam mode, all transmission channels can be controlled to radiate electromagnetic pulses into the airspace where the UAV swarm is located according to the required effective radiated power, so that each UAV in the swarm is simultaneously subjected to front-door path interference and back-door path interference. Through this transmission method, it is possible to ensure the formation of coherent superimposed field strength in the target area, ensuring that all swarm members are exposed to a sufficiently strong transient field under the wide-beam coverage, achieving single-transmission, swarm paralysis, and inducing level reversal.

[0102] In step 104, a continuous wave with pulse modulation, operating on the same frequency as the UAV's communication frequency, is used. High-power "front-door" interference directly enters the front end of the communication receiver, causing irreversible functional damage. Simultaneously, high-power "back-door" interference causes a "flip" in the digital logic of the UAV's flight control circuit, rendering its flight uncontrollable. One implementation method is as follows... Figure 6 As shown, Figure 6 This diagram illustrates the process by which a high-power electromagnetic pulse couples into an electronic device (i.e., a drone) through two paths: the "front door" and the "back door." The dashed box represents the entire electronic device, the arrows indicate the direction of energy propagation, and "incident radiation" represents the external electromagnetic pulse source.

[0103] Front door path: Electromagnetic pulses are received by the receiving antenna of the device (such as a remote control communication antenna) and transmitted into the electronic device through the signal transmission channel (such as RF front end, filter, amplifier). This path depends on the effective reception of electromagnetic waves at in-band frequencies and usually manifests as communication blockage or burnout.

[0104] Backdoor Path: Electromagnetic pulses couple into the device through unexpected paths such as shielding gaps, ventilation windows, or cable perforations, forming parasitic electric fields or currents that interfere with internal circuits (such as flight control chips, CPUs (Central Processing Units), and FPGAs (Field-Programmable Gate Arrays)). This path is not antenna-dependent but is affected by the effective area of ​​structural openings and coupling losses. The main principle behind the high-power electromagnetic pulse "backdoor" effect is to disrupt the flight control circuit logic of the UAV by emitting high-power electromagnetic pulses, causing its flight control function to malfunction and resulting in an uncontrollable crash. This process involves high-power electromagnetic pulse waveform modulation targeting the "upset" of the UAV's flight control logic. Through specific electromagnetic pulse repetition frequency jitter or random alternation modulation of repetitive pulses, the pulses couple into the control devices and control signal circuits of the UAV's flight control function components via structural openings and power / signal cables, generating induced pulse voltages. When the voltage level is comparable to the normal logic signal level, it triggers an "upset" effect in the flight control signal logic level, causing flight control malfunction and failure, leading to the UAV crashing uncontrollably.

[0105] High-power electromagnetic pulses can induce transient signals with amplitudes comparable to logic levels, which can disrupt the logic state of electronic devices. The consequences of these transient flips depend on the design of the target system and the characteristics of the electromagnetic pulse waveform, such as the repetition frequency or the duration of the pulse train. Figure 3 An example illustrates the transient flip caused by a single transient disturbance in a digital sequence. Figure 3The diagram illustrates a normal digital pulse train sequence in its ground state, also known as a ground state pulse. Bit flipping refers to the situation where, based on the ground state pulse, a digit 1 is overwhelmed or suppressed by interference, or a digit 0 is identified as 1. An erroneous bit refers to an erroneous bit "1" caused by interference on top of the ground state pulse. In reality, whether a digital circuit responds to this false information depends on whether the amplitude, duration, and timing of the erroneous bit are within the processing range of the digital processor. Bit drift is similar to the previous cases, but the amplitude and pulse width of the erroneous bit are closer to the real bit. Level suppression shows the shift in the circuit's ground or 0 potential within one bit cycle, similar to bit flipping, except that the bit amplitude here is smaller than the normal bit amplitude. Level latching shows a digital pulse sequence latched into a high level or "1" state. If damage causes a change in the impedance of the circuit or device, this sequence can also be latched into a low level or "0" state, or even into some uncertain states.

[0106] The following is a specific implementation case illustrating the combined "front / back door" effect jamming against drones operating in the 2.4GHz communication band.

[0107] Step 1. Waveform Settings:

[0108] The carrier frequency was selected as 2.4 GHz (100 MHz bandwidth), and the effective radiated electromagnetic pulse power was 10. 5 W;

[0109] The pulse width is 300 ns (nanoseconds), the repetition frequency is 1000 Hz, the repetition frequency jitter range is 10%, and it is a positive polarity repetitive pulse. Based on this, the pulse repetition frequency jitter is as follows: Figure 4 As shown, the pulse polarity and repetition frequency vary randomly as follows: Figure 5 As shown. Among them, Figure 4 and Figure 5 The horizontal axis represents time, expressed in milliseconds (ms), and the vertical axis represents amplitude, expressed in volts (V). Figure 4 and Figure 5 (The example is given in the text) or expressed as volts per meter (V / m).

[0110] Step 2. Countermeasures against interference:

[0111] For a quadcopter micro-drone flying at a distance of 500 meters, continuous radiation for no less than 1 second will cause the drone to lose flight control and crash to the ground.

[0112] Step 3. Combination effect:

[0113] "Front-door" interference can block the drone's remote control communication signal or cause incorrect demodulation; "back-door" interference can cause the drone's flight control logic level to "flip," resulting in distorted flight control commands and ultimately loss of flight control. Figure 7As shown.

[0114] The waveform modulation methods proposed in this invention, such as the combination of "front / back gate" effects, random jitter of pulse repetition frequency, and random transformation of the positive and negative polarities of repetitive pulses, can solve the problem of achieving efficient control logic disturbance of UAV flight control functions with relatively low power (below), and have the same effectiveness as HPM (high power microwave) with extremely high power requirements.

[0115] The following comparison between traditional solutions and embodiments of the present invention illustrates the beneficial effects of the embodiments of the present invention:

[0116] High-power electromagnetic pulse (EMP) effects, as a novel electronic warfare technique, have broad application prospects. Existing high-power EMP weapons, both domestically and internationally, are designed to cause short circuits or thermal damage to control circuits or devices. To achieve an effective range of 2 kilometers, a combined effective pulse peak power of no less than 10¹⁴ watts is required, meaning the system's pulse peak power must reach hundreds of megawatts (10¹⁴ watts). 8 The transmitting antenna (array) should have a gain of 60 dB (10⁶ times) or higher. The corresponding structural complexity, size, and weight are also significant, placing extremely high demands on the load and pointing control capabilities of the rotating servo mechanism. This makes system deployment difficult, inconvenient to use, and results in low combat effectiveness. Furthermore, because the beamwidth of a 60 dB gain antenna (array) is very small (less than 0.6°), it only affects a single target per action, making it ineffective against swarms of UAVs. To address these problems, this invention designs a high-power electromagnetic pulse backdoor interference pulse modulation waveform that primarily generates a logic function state "upset." This waveform features pulse repetition frequency jitter or random alternation of positive and negative polarities in the repetitive pulses, and selects a carrier frequency that is the same as the UAV's remote control (uplink) communication frequency, simultaneously generating a "front / back door" combined interference against the UAV with a relatively low gain of 10⁶. 8 The W effective transmit power simultaneously generates a "front / back door" combined effect, achieving equivalent effectiveness over a range of 2 kilometers. It also requires a gain of 25 dB for the antenna array and a response antenna beamwidth of approximately 15°, significantly enhancing its ability to strike and cover drone swarms.

[0117] Example 2:

[0118] Based on the same inventive concept, the present invention also provides a waveform modulation system for electromagnetic pulse combination effects, comprising:

[0119] The acquisition module is used to acquire the remote control communication frequency and flight status information of the UAV;

[0120] The parameter setting module is used to set electromagnetic pulse parameters based on the remote control communication frequency and to set the radiated power of the electromagnetic pulse based on flight status information.

[0121] The waveform generation module is used to generate an interference modulated waveform based on electromagnetic pulse parameters and using an interference waveform generation strategy. The carrier frequency of the interference modulated waveform is the same as or adjacent to the remote control communication frequency, and the pulse sequence of the interference modulated waveform has repetitive pulses including random jitter of repetition frequency and / or random alternation of positive and negative polarity.

[0122] The jamming module is used to emit electromagnetic pulses to the UAV with radiated power based on the jamming modulation waveform. It is used to interfere with the UAV's communication receiver through the front door path, and at the same time, it is coupled to the flight control circuit through the rear door path to induce level flipping.

[0123] In one specific implementation, the repetition frequency of the repetitive pulse fluctuates randomly by 10%-20%.

[0124] In one specific implementation, the pulse width of the interference modulation waveform is 1 μs to 10 μs, the duty cycle is 30% to 60%, and the basic value of the pulse repetition frequency is in the range of 100 Hz to 1 MHz.

[0125] In one specific implementation, the parameter setting module is specifically used for:

[0126] Based on the distance data in the flight status information, the radiation power of the electromagnetic pulse is dynamically adjusted according to the inverse square relationship of the distance.

[0127] If the distance is 1km, then the range of radiated power is 10. 5 W-10 8 W.

[0128] Optional, waveform generation module, specifically used for:

[0129] Based on the electromagnetic pulse parameters, a pulse group is generated;

[0130] Based on the principle of synchronizing the sequence update rate with the pulse repetition frequency, a linear feedback shift register or a cryptographically secure pseudo-random number generator is used to generate a binary pseudo-random sequence.

[0131] Based on each pulse in the pulse group, using the polarity mapping rule, a binary value is read from the binary pseudo-random sequence as the polarity of the pulse to obtain a polarized pulse signal;

[0132] A balanced modulator is used to reverse the phase of each polarity pulse signal to generate an interference modulation waveform.

[0133] In one specific implementation, the interference modulation waveform satisfies the following formula:

[0134]

[0135] in, To interfere with the modulated waveform, Let n be the amplitude of the nth pulse. For carrier frequency, Let n be the initial phase of the nth pulse. If it is positive polarity; if If , then it is negative polarity; t is time, and T is the pulse repetition period, which is related to the pulse repetition frequency. For pulse width, Π( ) is a rectangular window function.

[0136] In one specific implementation, if the drone is located in a drone swarm, and the drone swarm consists of multiple drones operating on the same frequency band, then the parameter setting module is also used for:

[0137] Based on the remote control communication frequencies and flight status information of multiple UAVs, a spectrum-space joint clustering analysis algorithm is used to obtain clustering results, which include UAV swarms and the dominant communication frequencies of the UAV swarms.

[0138] Based on the clustering results, the antenna beam operating mode is switched to low gain wide beam mode;

[0139] All transmission channels are synchronously locked to the dominant communication frequency to generate an interference modulation waveform with the same carrier frequency for each drone in the drone swarm.

[0140] The interference module is specifically used for:

[0141] Based on the interference modulation waveform of each UAV, in low-gain wide-beam mode, with effective radiated power, all transmission channels are controlled to radiate electromagnetic pulses into the airspace where the UAV swarm is located in a synchronous sequence, so that each UAV in the UAV swarm is simultaneously subjected to front door path interference and back door path interference.

[0142] Example 3:

[0143] This invention also provides an electronic device, which may be a computer device, a microcontroller device, a smart mobile device, etc. The electronic device in this embodiment may include a processor, a memory, a transceiver component, etc. The memory, processor, and transceiver component are connected via a bus; the memory can be used to store executable programs, and an exemplary executable program may include instructions; the processor is used to execute the instructions stored in the memory. The memory can also be used to store data, which can be accessed and / or modified when instructions are executed.

[0144] The processor may be a central processing unit (CPU), or it may be other general-purpose processors, digital signal processors (DSPs), application-specific integrated circuits (ASICs), off-the-shelf programmable gate arrays (FPGAs), or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. It is the computing core and control core of the terminal, and it is suitable for implementing one or more instructions. Specifically, it is suitable for loading and executing one or more instructions in the storage medium to realize the corresponding method flow or corresponding function, so as to realize the steps of the waveform modulation method of electromagnetic pulse combination effect in the above embodiments.

[0145] Example 4:

[0146] Based on the same inventive concept, this invention also provides a readable storage medium, specifically an electronic device readable storage medium (Memory). This readable storage medium is a memory device within an electronic device used to store programs and data. It is understood that the storage medium here can include both built-in storage media within the electronic device and extended storage media supported by the electronic device. The storage medium provides storage space, which stores the terminal's operating system. Furthermore, this storage space also stores one or more instructions suitable for loading and execution by a processor. These instructions can be one or more executable programs (including program code). It should be noted that the storage medium here can be high-speed RAM or non-volatile memory, such as at least one disk storage device. Loading and executing one or more instructions stored in the storage medium by the processor can implement the steps of the waveform modulation method for electromagnetic pulse combination effects described in the above embodiments.

[0147] Those skilled in the art will understand that embodiments of the present invention can be provided as methods, systems, or computer program products. Therefore, the present invention can take the form of a completely hardware embodiment, a completely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, the present invention can take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0148] This invention is described with reference to flowchart illustrations and / or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. It will be understood that each block of the flowchart illustrations and / or block diagrams, and combinations of blocks in the flowchart illustrations and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, special-purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, generate instructions for implementing the flowchart illustrations and / or block diagrams. Figure 1 One or more processes and / or boxes Figure 1 A device that provides the functions specified in one or more boxes.

[0149] These computer program instructions may also be stored in a computer-readable storage medium that can direct a computer or other programmable data processing device to function in a particular manner, such that the instructions stored in the computer-readable storage medium produce an article of manufacture including instruction means, which are implemented in a process Figure 1 One or more processes and / or boxes Figure 1 The function specified in one or more boxes.

[0150] These computer program instructions may also be loaded onto a computer or other programmable data processing equipment to cause a series of operational steps to be performed on the computer or other programmable equipment to produce a computer-implemented process, thereby providing instructions that execute on the computer or other programmable equipment for implementing the process. Figure 1 One or more processes and / or boxes Figure 1 The steps of the function specified in one or more boxes.

[0151] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit its scope of protection. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that after reading the present invention, they can still make various changes, modifications or equivalent substitutions to the specific implementation methods of the application, but these changes, modifications or equivalent substitutions are all within the scope of protection of the claims pending approval.

Claims

1. A waveform modulation method of electromagnetic pulse combination effect, characterized in that, include: Acquire the remote control communication frequency and flight status information of the drone; Based on the remote control communication frequency, the electromagnetic pulse parameters are set; Based on the flight status information, the radiation power of the electromagnetic pulse is set; Based on the electromagnetic pulse parameters, an interference modulation waveform is generated using an interference waveform generation strategy. The carrier frequency of the interference modulation waveform is the same as or adjacent to the remote control communication frequency, and the pulse sequence of the interference modulation waveform has repetitive pulses including random jitter of repetition frequency and / or random alternation of positive and negative polarity. Based on the interference modulation waveform, an electromagnetic pulse is emitted towards the UAV with the radiated power to interfere with the UAV's communication receiver through the front door path, and simultaneously to induce a flight control logic level flip through the flight control circuit of the UAV coupled to the rear door path.

2. The method of claim 1, wherein, The repetition frequency of the repetitive pulse has a random jitter amplitude of 10%-20%.

3. The method of claim 1 or 2, wherein, The interference modulation waveform has a pulse width of 1 μs to 10 μs, a duty cycle of 30% to 60%, and a base value of pulse repetition frequency in the range of 100 Hz to 1 MHz.

4. The method of claim 1, wherein, The step of setting the radiated power of the electromagnetic pulse based on the flight status information includes: Based on the distance data in the flight status information, the radiation power of the electromagnetic pulse is dynamically adjusted according to the inverse square relationship of the distance. If the distance data is 1 km, the radiation power is in the range of 10 5 W-10 8 W.

5. The method as described in claim 1, characterized in that: Based on the electromagnetic pulse parameters, an interference modulation waveform is generated using an interference waveform generation strategy, including: Based on the electromagnetic pulse parameters, a pulse group is generated; Based on the principle of synchronizing the sequence update rate with the pulse repetition frequency, a linear feedback shift register or a cryptographically secure pseudo-random number generator is used to generate a binary pseudo-random sequence. Based on each pulse in the pulse group, using the polarity mapping rule, a binary value is read from the binary pseudo-random sequence as the polarity of the pulse to obtain a polarized pulse signal; A balanced modulator is used to reverse the phase of each polarity pulse signal to generate an interference modulation waveform.

6. The method as described in claim 5, characterized in that, The interference modulation waveform satisfies the following formula: in, To interfere with the modulated waveform, Let n be the amplitude of the nth pulse. For carrier frequency, Let n be the initial phase of the nth pulse. If it is positive polarity; if If , then it is negative polarity; t is time, and T is the pulse repetition period, which is related to the pulse repetition frequency. For pulse width, Π( ) is a rectangular window function.

7. The method as described in claim 1, characterized in that, If the drone is located in a drone swarm, and the drone swarm consists of multiple drones operating on the same frequency band; then before generating the interference modulation waveform based on the electromagnetic pulse parameters using the interference waveform generation strategy, the process further includes: Based on the remote control communication frequencies and flight status information of multiple UAVs, a spectrum-space joint clustering analysis algorithm is used to obtain clustering results, which include UAV swarms and the dominant communication frequencies of the UAV swarms. Based on the clustering results, the antenna beam operating mode is switched to low-gain wide-beam mode. All transmission channels are synchronously locked to the dominant communication frequency to generate an interference modulation waveform with the same carrier frequency for each drone in the drone swarm. The step of transmitting an electromagnetic pulse to the UAV with the radiated power based on the interference modulation waveform includes: Based on the interference modulation waveform of each UAV, in the low-gain wide-beam mode, with the radiation power, all transmission channels are controlled to radiate electromagnetic pulses into the airspace where the UAV swarm is located in a synchronous sequence, so that each UAV in the UAV swarm is simultaneously subjected to front door path interference and back door path interference.

8. A waveform modulation system based on electromagnetic pulse combination effect, characterized in that, include: The acquisition module is used to acquire the remote control communication frequency and flight status information of the UAV; The parameter setting module is used to set the electromagnetic pulse parameters based on the remote control communication frequency; Based on the flight status information, the radiation power of the electromagnetic pulse is set; The waveform generation module is used to generate an interference modulated waveform based on the electromagnetic pulse parameters and using an interference waveform generation strategy. The carrier frequency of the interference modulation waveform is the same as or adjacent to the remote control communication frequency, and the pulse sequence of the interference modulation waveform has repetitive pulses including random jitter of repetition frequency and / or random alternation of positive and negative polarity. The interference module is used to emit electromagnetic pulses to the UAV with the radiated power based on the interference modulation waveform, to interfere with the UAV's communication receiver through the front door path, and simultaneously to induce logic level flipping by coupling to the UAV's flight control circuit through the rear door path.

9. An electronic device, characterized in that, include: At least one processor and memory; The memory and processor are connected via a bus; The memory is used to store one or more programs; When the one or more programs are executed by the at least one processor, the waveform modulation method of electromagnetic pulse combination effect as described in any one of claims 1 to 7 is implemented.

10. A readable storage medium, characterized in that, It contains an executable program, which, when executed, implements the waveform modulation method of electromagnetic pulse combination effect as described in any one of claims 1 to 7.

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