Unmanned aerial vehicle navigation signal interference method and system based on electromagnetic shielding array

Abstract

The invention provides an unmanned aerial vehicle navigation signal interference method and system based on an electromagnetic shielding array. According to the method, firstly, a navigation signal sent by a target unmanned aerial vehicle is monitored, positioning information transmission characteristics in the navigation signal are identified, then a periodic dynamic interference mode synchronous with a navigation signal transmission period is generated according to the positioning information transmission characteristics, and then, through spatial gradient barrier distribution of an electromagnetic shielding array, a dynamic interference mode is generated. Converting the periodic dynamic interference mode into directional space interference energy, and finally controlling the directional space interference energy to be continuously applied to a navigation signal receiving path of the unmanned aerial vehicle so as to complete navigation signal interference of the unmanned aerial vehicle. According to the technical scheme provided by the invention, a frequency hopping anti-interference mechanism of the unmanned aerial vehicle is effectively cracked, invalid energy consumption is remarkably reduced, the interference efficiency is improved, and error interference on non-target equipment is avoided.

Description

Technical Field

[0001] The present application relates to the field of UAV positioning countermeasure technology, and in particular to a method and system for jamming UAV navigation signals based on an electromagnetic shielding array. Background Art

[0002] In sensitive airspace, illegally invading drones pose a serious threat to public safety and critical infrastructure.

[0003] The current mainstream technology employs a full-band suppression jamming mechanism, using a high-power signal generator to emit a broad-spectrum noise signal, coupled with an omnidirectional antenna to blanket the airspace with energy. This approach attempts to disrupt the drone's navigation system by indiscriminately suppressing the signal. The jamming range covers the frequency bands commonly used by civilian drones for communication and positioning.

[0004] However, such solutions have three essential flaws. First, full-band energy coverage will interfere with legitimate radio services such as civil aviation control communications and emergency rescue channels, violating spectrum management regulations. Second, continuous high-power output causes a surge in equipment energy consumption, making it difficult to achieve stable power supply in remote infrastructure areas. Finally, the static interference mode cannot cope with the adaptive frequency hopping technology of new drones. When the target drone automatically switches communication frequency bands, the interference effect is immediately lost. Summary of the Invention

[0005] The present application provides a method and system for jamming UAV navigation signals based on an electromagnetic shielding array, which is used to solve the problems of indiscriminate signal blocking, high power consumption and unsustainable operation of the omnidirectional multi-band suppression jamming scheme in the existing technology, and the static jamming mode that is easily circumvented by new UAV anti-jamming technology.

[0006] In a first aspect, the present application provides a method for jamming UAV navigation signals based on an electromagnetic shielding array, comprising: Monitoring navigation signals emitted by target drones in the drone activity area and identifying positioning information transmission characteristics contained in the navigation signals; generating a periodic dynamic interference pattern synchronized with a navigation signal transmission period based on the positioning information transmission characteristics; converting the periodic dynamic interference pattern into directional spatial interference energy through spatial gradient barrier distribution of an electromagnetic shielding array; The directional spatial interference energy is controlled to be continuously applied to the navigation signal receiving path of the target UAV to complete the navigation signal interference of the target UAV.

[0007] Optionally, monitoring navigation signals emitted by a target UAV in a UAV activity area and identifying positioning information transmission features contained in the navigation signals includes: The mixed waveform of the navigation signal emitted by the target UAV is collected by using multiple sensor arrays pre-deployed in the three-dimensional space of the UAV activity area; Performing signal decoupling on the mixed waveform of the navigation signal to separate basic signal features, wherein the basic signal features include signal fluctuation change features, signal coding structure features, and signal strength distribution features; According to the basic signal characteristics, the positioning information transmission characteristics of the target UAV are analyzed, wherein the positioning information transmission characteristics include positioning information update period characteristics, positioning information carrying mode characteristics and positioning information modulation characteristics.

[0008] Optionally, generating a periodic dynamic interference pattern synchronized with the navigation signal transmission period according to the positioning information transmission characteristics includes: Based on the positioning information update period feature in the positioning information transmission feature, determining a time base of an interference signal and dividing activation time windows of multiple interference units in an electromagnetic shielding array, wherein the interference signal includes a pseudo-random fluctuation signal, a frequency offset signal, and a phase modulation signal; Defining the divided multiple interference units into multiple interference unit groups, and assigning an interference signal type to each interference unit group according to the characteristics of the positioning information carrying method; According to the spatial dependence of the modulation characteristics of the positioning information, the activation time sequence of the interference unit with non-uniform time intervals is generated; In the activation time window, the interference unit group is controlled to transmit matching interference signal types according to the interference unit activation sequence, thereby forming a periodic dynamic interference pattern synchronized with the navigation signal transmission period.

[0009] Optionally, generating an interference unit activation sequence with non-uniform time intervals according to the spatial dependency of the positioning information modulation feature includes: Analyzing spatial dependency features in the positioning information modulation features, the spatial dependency features including signal strength attenuation with height and modulation distortion features caused by multipath effects; Based on the signal strength attenuation characteristics with altitude, the target drone activity area is divided into a low-altitude area and a medium-high altitude area. The low-altitude area is a spatial range with an altitude of less than or equal to 100 meters, and the medium-high altitude area is a spatial range with an altitude of more than 100 meters. Based on the modulation distortion characteristics caused by the multipath effect, a short-interval dense activation timing rule is assigned to the low-altitude area, and a long-interval sparse activation timing rule is assigned to the medium- and high-altitude areas; In the divided activation time windows, according to the short interval dense activation timing rule and the long interval sparse activation timing rule, the interference unit activation timings corresponding to the low altitude area and the middle and high altitude area are generated respectively.

[0010] Optionally, within the activation time window, controlling the interference unit group to transmit a matching interference signal type according to the interference unit activation timing to form a periodic dynamic interference pattern synchronized with the navigation signal transmission period includes: When the interference signal type assigned to the interference unit group is a pseudo-random fluctuation signal, within the activation time window, the interference unit group is triggered according to the non-uniform time interval activation sequence to generate a fluctuation signal with a random amplitude jump; When the interference signal type assigned to the interference unit group is a frequency offset signal, within the activation time window, the interference unit group is triggered according to the non-uniform time interval activation timing to generate a modulation signal with a periodic carrier frequency offset; When the interference signal type assigned to the interference unit group is a phase modulation signal, within the activation time window, the interference unit group is triggered according to the non-uniform time interval activation timing to generate a phase mutation waveform; The fluctuation signal with random amplitude jump, the modulation signal with periodic carrier frequency offset and the phase mutation waveform are superimposed in three-dimensional space to form a periodic dynamic interference pattern synchronized with the navigation signal transmission period.

[0011] Optionally, the periodic dynamic interference pattern is converted into directional spatial interference energy by distributing spatial gradient barriers of an electromagnetic shielding array, comprising: According to the three-dimensional spatial characteristics of the drone's activity area, the unit space arrangement structure of the electromagnetic shielding array is configured, wherein the low-altitude area adopts a first unit spacing, and the medium and high altitude areas adopt a second unit spacing, and the first unit spacing is smaller than the second unit spacing; Map the periodic dynamic interference pattern to the spatial gradient barrier distribution, where the pseudo-random fluctuation signal is mapped to the low-altitude area and the frequency offset signal is mapped to the medium- and high-altitude area; Based on the unit space arrangement structure, a dense interference intensity distribution is formed in the low-altitude area, and a sparse interference intensity distribution is formed in the medium and high-altitude areas, so that the high interference intensity areas and low interference intensity areas alternately arranged in the three-dimensional space constitute directional spatial interference energy.

[0012] Optionally, controlling the directional spatial interference energy to be continuously applied to a navigation signal receiving path of the target UAV to interfere with the navigation signal of the target UAV includes: Obtaining the signal reception azimuth characteristics of the target UAV, wherein the signal reception azimuth characteristics include the pointing angle characteristics of the receiving antenna and the spatial distribution characteristics of the received signal strength; According to the pointing angle characteristics, matching the low-altitude area interference unit group and the medium-high altitude area interference unit group in the spatial gradient barrier distribution of the electromagnetic shielding array; Based on the distribution of high and low interference intensity areas, the directional spatial interference energy projection ratio is dynamically adjusted within the matching interference unit group. At the same time, the adjusted directional spatial interference energy projection ratio is calibrated according to the interference signal type of the periodic dynamic interference pattern. Based on the calibrated directional spatial interference energy projection ratio, through the spatial synergy of the low-altitude area interference unit group and the directional propagation synergy of the medium and high-altitude area interference unit group, a continuous interference chain covering the motion trajectory of the target UAV is generated in three-dimensional space to complete the navigation signal interference of the target UAV.

[0013] In a second aspect, the present application provides a UAV navigation signal jamming system based on an electromagnetic shielding array, comprising: An identification module is used to monitor the navigation signals emitted by the target drone in the drone activity area and identify the positioning information transmission characteristics contained in the navigation signals; A generating module, configured to generate a periodic dynamic interference pattern synchronized with a navigation signal transmission period based on the positioning information transmission characteristics; a conversion module, configured to convert the periodic dynamic interference pattern into directional spatial interference energy through spatial gradient barrier distribution of an electromagnetic shielding array; The control module is used to control the directional spatial interference energy to be continuously applied to the navigation signal receiving path of the target UAV to complete the navigation signal interference of the target UAV.

[0014] In a third aspect, the present application provides a computing device comprising a processing component and a storage component; the storage component stores one or more computer instructions; the one or more computer instructions are used to be called and executed by the processing component to implement a drone navigation signal interference method based on an electromagnetic shielding array as described in the first aspect above.

[0015] In a fourth aspect, the present application provides a computer storage medium storing a computer program. When the computer program is executed by a computer, it implements a method for interfering with drone navigation signals based on an electromagnetic shielding array as described in the first aspect.

[0016] This application achieves precise synchronous control of the interference pattern by monitoring the navigation signal of the target drone and identifying its positioning information transmission characteristics. It generates a periodic dynamic interference pattern that is strictly synchronized with the navigation signal transmission period, ensuring that the interference energy continuously covers the signal receiving window of the target drone in the time domain. Furthermore, through the spatial gradient barrier distribution of the electromagnetic shielding array, the dynamic interference pattern is converted into directional interference energy with alternating high / low intensities in three-dimensional space, so that the interference energy is precisely focused on the navigation signal receiving path of the target drone, significantly improving the interference efficiency and avoiding accidental interference with non-target devices.

[0017] Furthermore, the activation time windows of the interference units are divided based on the characteristics of the positioning information update cycle. In combination with the characteristics of the positioning information carrying mode, three types of interference signals, pseudo-random fluctuation, frequency offset, and phase modulation, are assigned to different interference unit groups to achieve a deep match between the interference strategy and the characteristics of the UAV navigation signal. By generating activation timings with non-uniform time intervals through spatial dependency characteristics, the interference signal transmission timing is dynamically adapted to complex environmental characteristics such as the multipath effect of urban buildings or signal attenuation in open airspace. Ultimately, a dynamic interference pattern is formed within the activation time window that is strictly synchronized with the navigation signal cycle, effectively defeating the UAV's frequency hopping anti-interference mechanism and significantly reducing ineffective energy consumption.

[0018] These and other aspects of the present application will become more readily apparent from the description of the following embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions in the present application or the prior art, a brief introduction will be given below to the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0020] Figure 1 A flowchart of a method for jamming UAV navigation signals based on an electromagnetic shielding array provided by the present application is shown; Figure 2 The present invention provides a schematic structural diagram of a UAV navigation signal jamming system based on an electromagnetic shielding array; Figure 3 A schematic structural diagram of a computing device provided by the present application is shown. DETAILED DESCRIPTION

[0021] In order to enable people skilled in the art to better understand the solution of this application, the technical solution of this application will be clearly and completely described below in conjunction with the drawings in this application.

[0022] In some of the processes described in the specification and claims of this application and the above-mentioned figures, multiple operations that appear in a specific order are included, but it should be clearly understood that these operations may not be executed in the order in which they appear in this document or may be executed in parallel. The serial numbers of the operations, such as 101, 102, etc., are only used to distinguish between different operations, and the serial numbers themselves do not represent any order of execution. In addition, these processes may include more or fewer operations, and these operations may be executed in sequence or in parallel. It should be noted that the descriptions of "first", "second", etc. in this document are used to distinguish different messages, devices, modules, etc., and do not represent a sequential order, nor do they limit "first" and "second" to being different types.

[0023] The following will be combined with the accompanying drawings to clearly and completely describe the technical solutions in this application. Obviously, the embodiments described are only some of the embodiments of this application, not all of them. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without making any creative efforts shall fall within the scope of protection of this application.

[0024] Figure 1 This application provides a flowchart of a method for jamming UAV navigation signals based on an electromagnetic shielding array, such as Figure 1 As shown, the method includes: Step 101: monitor the navigation signal emitted by the target UAV in the UAV activity area and identify the positioning information transmission characteristics contained in the navigation signal.

[0025] In this step, the navigation signal refers to the radio waveform emitted by the target UAV for positioning, which includes carrier frequency, modulation coding and positioning data; the positioning information transmission characteristics are composed of the positioning information update cycle characteristics (the time pattern of positioning data broadcast), the positioning information carrying method characteristics (the encapsulation structure of the position data in the signal) and the positioning information modulation characteristics (the distortion pattern of the signal waveform caused by the environment), which are used to analyze the signal transmission mechanism of the UAV positioning system.

[0026] In this embodiment, a three-dimensional sensor array pre-deployed in the target airspace synchronously captures the mixed waveform of the navigation signal emitted by the UAV, and the waveform separation technology is used to decouple the mixed waveform to separate the signal fluctuation change characteristics (reflecting the change trend of the signal amplitude over time), the signal coding structure characteristics (reflecting the navigation information coding rules) and the signal strength distribution characteristics (describing the spatial attenuation characteristics of the signal); the positioning information update period characteristics are identified based on the signal fluctuation change characteristics, and the positioning data broadcast period is determined by analyzing the signal amplitude peak interval; the positioning information carrying mode characteristics are identified based on the signal coding structure characteristics, and the position data encapsulation form is determined by parsing the repeated coding segments; the positioning information modulation characteristics are identified based on the signal strength distribution characteristics, and the environmental interference mode is inferred by comparing the waveform distortion degree at different spatial positions, and finally the complete positioning information transmission characteristics are integrated and output.

[0027] For example, in an urban security scenario, a sensor array deployed atop a high-rise building captures the mixed waveform of GPS navigation signals transmitted by drones. Waveform separation techniques extract the following features: The signal fluctuation characteristics reveal periodic amplitude jumps every second, corresponding to the positioning information update cycle; the signal coding structure features a coding sequence with a fixed header identifier, corresponding to the carrier mode; and the signal intensity distribution features indicate that reflections from glass curtain walls increase the distortion rate of low-altitude signals, corresponding to the spatial dependence of the modulation characteristics. This combination of features provides environmental adaptation parameters for subsequent dynamic interference.

[0028] Step 102: Generate a periodic dynamic interference pattern synchronized with the navigation signal transmission period based on the positioning information transmission characteristics.

[0029] In this step, the navigation signal transmission period refers to the fixed time interval regularity of the target UAV positioning information broadcast; the periodic dynamic interference pattern is a combination of time-varying interference waveforms emitted by the electromagnetic shielding array and strictly synchronized with the navigation signal period, including pseudo-random fluctuation signals (waveforms with irregular amplitude jumps), frequency offset signals (waveforms with periodic carrier frequency changes) and phase modulation signals (waveforms with sudden phase changes), which are used to match the time domain characteristics of the UAV positioning signal.

[0030] In this embodiment, the activation time window of the electromagnetic shielding array is divided based on the positioning information update cycle characteristics, and the array units are divided into multiple interference unit groups according to the spatial position; the interference signal type is allocated according to the characteristics of the positioning information carrying method: the head identification carrying method corresponds to the pseudo-random fluctuation signal, the segmented embedding method corresponds to the frequency offset signal, and the hybrid modulation method corresponds to the phase modulation signal; based on the spatial dependence of the positioning information modulation characteristics, a non-uniform time interval activation timing sequence is generated - a short interval dense triggering rule is adopted in a densely built area, and a long interval sparse triggering rule is adopted in an open area; within the activation time window, the matching interference signal type is emitted by the control unit group according to the non-uniform timing sequence, and finally a dynamic interference pattern synchronized with the navigation signal cycle is formed.

[0031] For example, based on the positioning information transmission characteristics of urban security scenarios (glass curtain wall reflections cause low-altitude signal distortion), the electromagnetic shielding array elements are divided into three groups: the element group at the top of high-rise buildings is assigned a pseudo-random fluctuation signal (matching the GPS header identifier), the element group at street level is assigned a frequency offset signal (corresponding to the segmented embedding method), and the element group in the open area of ​​parks is assigned a phase modulated signal (accommodating the hybrid modulation characteristics). Based on the signal distortion characteristics, the element group in the building area uses a short interval trigger sequence of milliseconds, while the element group in the open area uses a long interval trigger sequence of hundreds of milliseconds. When the drone flies over a commercial area, the element group in the building area emits a dense amplitude jump interference wave, while the element group in the open area emits a sparse carrier frequency offset wave, forming a dynamic interference field strictly synchronized with the 1Hz update period of the GPS signal.

[0032] Step 103 : converting the periodic dynamic interference pattern into directional spatial interference energy through the spatial gradient barrier distribution of the electromagnetic shielding array.

[0033] In this step, the electromagnetic shielding array refers to a signal transmitting device composed of multiple independently controllable interference units arranged in three-dimensional space; the spatial gradient barrier distribution is an interference intensity gradient structure formed by differentiated configuration of unit spacing, in which dense unit arrangement is used in low-altitude areas to enhance signal reflection, and sparse unit arrangement is used in medium and high altitude areas to optimize directional energy propagation; directional spatial interference energy is a focused energy field formed by alternating high interference intensity areas and low interference intensity areas, and its energy propagation direction is aligned with the target UAV navigation signal receiving path.

[0034] In this embodiment, the electromagnetic shielding array unit arrangement structure is configured according to the three-dimensional spatial characteristics of the target airspace: dense unit spacing is used in densely built areas to enhance signal reflection capability, and sparse unit spacing is used in open areas to improve energy directionality; the periodic dynamic interference pattern generated in step 102 is mapped to the spatial distribution, the pseudo-random fluctuation signal is assigned to the low-altitude building area unit group, and the frequency offset signal is assigned to the medium- and high-altitude open area unit group; based on the unit arrangement structure, a high-intensity interference field (dense unit reflection superposition) is formed in the low-altitude area, and a low-intensity interference field (sparse unit directional radiation) is formed in the medium- and high-altitude area. By alternating the high / low intensity areas in three-dimensional space, a directional energy channel pointing to the drone signal reception path is constructed.

[0035] For example, to address the dynamic interference patterns of urban security scenarios (pseudo-random fluctuation signals in built-up areas and frequency-shifted signals in open areas), dense element arrays with a wavelength of one-quarter are deployed around glass curtain walls in commercial areas to enhance signal reflection and create a high-intensity interference zone. A sparse element array with a wavelength of one-half is deployed in open areas of parks to optimize directional propagation and create a low-intensity interference zone. When a target drone traverses the transition airspace between the commercial area and the park, high-intensity interference zones (reflections from the curtain wall) alternate with low-intensity interference zones (directional in the open area), precisely focusing energy in the direction of the drone's GPS receiving antenna, creating directional interference without blind spots.

[0036] Step 104: Control the directional spatial interference energy to be continuously applied to the navigation signal receiving path of the target UAV to complete the navigation signal interference of the target UAV.

[0037] In this step, the navigation signal receiving path refers to the physical channel through which the target UAV receives the navigation signal, including the spatial pointing characteristics of the receiving antenna (the radiation direction angle of the antenna main lobe) and the signal propagation path characteristics (the combination of the direct and reflected paths of the navigation signal to the UAV), which are used to determine the focusing direction of the interference energy.

[0038] In this embodiment, the spatial pointing characteristics of the receiving antenna are obtained by analyzing the peak distribution of the drone's received signal intensity; the spatial gradient barrier distribution of the electromagnetic shielding array is matched according to the pointing characteristics: the pointing of the low-altitude building area is matched with the low-altitude regional interference unit group, and the pointing of the medium- and high-altitude open area is matched with the medium- and high-altitude regional interference unit group; based on the high / low interference intensity regional distribution, the directional spatial interference energy projection ratio is dynamically adjusted, the projection intensity is increased in the building reflection-dominated area, and the projection intensity is reduced in the open directional propagation area; through the spatial synergy of the low-altitude unit group (superposition of building reflection waves) and the directional propagation synergy of the medium- and high-altitude unit group (beam directional focusing), a continuous interference chain covering the drone's motion trajectory is generated in three-dimensional space, thereby achieving continuous blocking of the navigation signal receiving path.

[0039] For example, to address the directional spatial interference energy of urban security scenarios (where high-intensity interference zones in commercial areas alternate with low-intensity interference zones in parks), the system uses the peak received signal strength to determine the antenna pitch angle pointing toward the park for drones flying from commercial areas to parks. This system activates the reflection enhancement mode (increasing the projection ratio) for the glass curtain wall units in the commercial areas, while the directional focusing mode (reducing the projection ratio) is activated for the units in the open areas of the park. When a drone traverses the transition airspace between buildings and parks, the dense interference chain formed by curtain wall reflections seamlessly merges with the sparse interference chain formed by directional beamforming, creating a continuous interference field along the drone's antenna's pointing path, completely disabling navigation signal reception.

[0040] To summarize, this application monitors the target UAV navigation signal and analyzes its positioning information transmission characteristics to generate a dynamic interference pattern that is strictly synchronized with the navigation signal period, and utilizes the spatial gradient barrier distribution of the electromagnetic shielding array to convert the interference pattern into directional focused energy. Finally, through dynamic calibration of the projection ratio and collaborative interference chain generation, it achieves continuous and precise blocking of the UAV navigation signal receiving path.

[0041] As an practicable embodiment, according to step 101, monitoring the navigation signal emitted by the target drone in the drone activity area and identifying the positioning information transmission characteristics contained in the navigation signal includes: Step 201 : Utilize multiple sensor arrays pre-deployed in the three-dimensional space of the drone activity area to collect the mixed waveform of the navigation signal transmitted by the target drone.

[0042] In this step, multiple sensor arrays refer to a group of collaborative signal capture devices deployed in a three-dimensional grid topology in three-dimensional space, which are used to synchronously collect the composite electromagnetic signals emitted by the target UAV; the mixed waveform is an unseparated waveform formed by the superposition of the target navigation signal and the environmental reflection signal, which includes the time domain superposition of the direct signal, multipath reflection signal and environmental noise.

[0043] In this embodiment, a three-dimensional sensor array pre-positioned in the target airspace (e.g., deployed on building roofs, ground-based monitoring stations, and aerial platforms) synchronously captures the mixed waveform of navigation signals transmitted by drones. Each sensor in the array receives signals based on their spatial location, and a time synchronization module aligns the sampling timing to generate raw data containing the direct component of the target signal, multipath components reflected from buildings, and electromagnetic environmental noise.

[0044] Step 202 : performing signal decoupling on the mixed waveform of the navigation signal to separate basic signal features, wherein the basic signal features include signal fluctuation variation features, signal coding structure features, and signal strength distribution features.

[0045] In this step, signal decoupling is the process of extracting independent physical features from mixed signals through waveform separation technology; the signal fluctuation change characteristics are used to reflect the changing trend of signal amplitude over time; the signal coding structure characteristics are used to reflect the encoding rules of navigation information in the signal; and the signal intensity distribution characteristics are used to describe the attenuation law of signal energy in space.

[0046] In this embodiment, the mixed waveform collected in step 201 is subjected to signal decoupling processing: the signal fluctuation change characteristics (identifying the amplitude change curve over time), signal coding structure characteristics (extracting the recurring coding segment sequence), and signal intensity distribution characteristics (analyzing the signal energy attenuation slope at different spatial positions) are separated through waveform separation technology; the fluctuation change characteristics are obtained by time domain envelope extraction, the coding structure characteristics are identified by segment matching, and the intensity distribution characteristics are generated by spatial energy gradient analysis.

[0047] Step 203: Analyze the positioning information transmission characteristics of the target UAV based on the basic signal characteristics, wherein the positioning information transmission characteristics include positioning information update period characteristics, positioning information carrying mode characteristics, and positioning information modulation characteristics.

[0048] In this step, the positioning information update cycle characteristic refers to the time interval regularity of the positioning data broadcast; the positioning information carrying mode characteristic refers to the encapsulation structure of the location data in the signal; and the positioning information modulation characteristic refers to the distortion pattern caused by the environment to the signal carrier.

[0049] In this embodiment, the transmission characteristics are analyzed based on the basic signal characteristics: the positioning information update period characteristics are determined by the periodic peak intervals of the signal fluctuation change characteristics; the positioning information carrying method characteristics (such as header identification encapsulation or segmented embedding) are analyzed by the repeated segment arrangement rules of the signal coding structure characteristics; the positioning information modulation characteristics are inferred by the spatial distortion gradient of the signal strength distribution characteristics (such as carrier frequency offset caused by high-voltage electromagnetic fields).

[0050] As yet another embodiment, according to step 102, generating a periodic dynamic interference pattern synchronized with the navigation signal transmission period based on the positioning information transmission characteristics includes: Step 301, based on the positioning information update period characteristics in the positioning information transmission characteristics, determine the time reference of the interference signal and divide the activation time windows of multiple interference units in the electromagnetic shielding array, wherein the interference signal includes a pseudo-random fluctuation signal, a frequency offset signal and a phase modulation signal.

[0051] In this step, the interference signal time base refers to the interference timing synchronization starting point established according to the positioning information broadcast interval; the activation time window is the time period during which the interference unit in the electromagnetic shielding array is allowed to transmit the interference signal, and its total duration is aligned with the navigation signal transmission period.

[0052] In this embodiment, based on the positioning information update cycle characteristics analyzed in step 203 (such as the second-level update rule of Beidou signals), the navigation signal transmission period is used as the time reference and is divided into multiple continuous time window units in equal proportion; each time window unit corresponds to the activity period of a group of interference units in the electromagnetic shielding array, and at the same time, a set of interference signal types (pseudo-random fluctuation signals, frequency offset signals, phase modulation signals) is defined as the basis for subsequent allocation.

[0053] Step 302: define the divided multiple interference units into multiple interference unit groups, and assign an interference signal type to each interference unit group according to the characteristics of the positioning information carrying method.

[0054] In this step, the interference unit group refers to a set of units in the electromagnetic shielding array that share the same activation time window.

[0055] In this embodiment, the interference units corresponding to the activation time window units divided in step 301 are classified into independent unit groups; based on the characteristics of the positioning information carrying method analyzed in step 203 (such as segmented verification encapsulation), interference signal types are assigned to different unit groups: the header identification carrying method corresponds to the pseudo-random fluctuation signal, the segmented embedding method corresponds to the frequency offset signal, and the mixed modulation method corresponds to the phase modulation signal.

[0056] Step 303: Generate an interference unit activation sequence with non-uniform time intervals according to the spatial dependency of the positioning information modulation feature.

[0057] In this step, the non-uniform time interval activation sequence refers to the unit triggering rules that are dynamically adjusted according to spatial dependence, including two types of modes: short-interval dense triggering (building / electromagnetic dense area) and long-interval sparse triggering (open area).

[0058] In this embodiment, based on the spatial dependence of the positioning information modulation characteristics analyzed in step 203 (such as the high-voltage electromagnetic field distortion gradient), differentiated activation timings are generated for different airspace unit groups: a short-interval dense triggering rule is adopted in the electromagnetic dense area (around the transmission station), and a long-interval sparse triggering rule is adopted in the open area (around the substation).

[0059] Step 304: within the activation time window, control the interference unit group to transmit matching interference signal types according to the interference unit activation sequence, so as to form a periodic dynamic interference pattern synchronized with the navigation signal transmission period.

[0060] In this embodiment, within the activation time window divided in step 301, each unit group is controlled to transmit an interference signal according to the timing rules generated in step 303: the first unit group transmits a frequency offset signal under a short interval timing, and the second unit group transmits a phase modulation signal under a long interval timing; a dynamic interference field synchronized with the second-level update cycle of the Beidou signal is generated through signal spatial superposition.

[0061] As another embodiment, according to step 303, generating an interference unit activation sequence with non-uniform time intervals according to the spatial dependency of the positioning information modulation feature includes: Step 401: Analyze the spatial dependency features in the positioning information modulation features, where the spatial dependency features include signal strength attenuation with height and modulation distortion features caused by multipath effects.

[0062] In this step, the spatial dependence characteristics refer to the influence of the environmental physical field on the transmission of navigation signals, including the signal strength attenuation characteristics with altitude (the gradient law of signal energy attenuation with increasing altitude) and the modulation distortion characteristics caused by multipath effects (the signal waveform distortion pattern caused by environmental factors such as building reflections). They are used to quantify the interference intensity of navigation signals at different spatial positions.

[0063] In this embodiment, based on the positioning information modulation features analyzed in step 203, the attenuation slope characteristic of signal strength as it changes with altitude (reflecting the signal attenuation trend in open airspace) and the multipath modulation distortion characteristic (quantifying the degree of waveform distortion caused by reflections in densely built-up areas) are separated. The altitude attenuation gradient is extracted by analyzing the signal intensity peak distribution, and the multipath influence weight is inferred by calculating the waveform distortion rate, forming a set of spatially dependent feature parameters.

[0064] Step 402: Based on the signal strength attenuation characteristic with altitude, the target UAV activity area is divided into a low-altitude area and a medium-high altitude area, wherein the low-altitude area is a spatial range with an altitude less than or equal to 100 meters, and the medium-high altitude area is a spatial range with an altitude greater than 100 meters.

[0065] In this step, low-altitude areas are defined as areas with severe signal attenuation and significant multipath effects (e.g., densely populated areas below or equal to 100 meters). Medium- and high-altitude areas are defined as areas with stable signal transmission and gentle attenuation (e.g., open airspace above 100 meters). These areas are defined based on the critical point where the signal strength attenuation characteristic changes dramatically.

[0066] In this embodiment, according to the gradient change law of the signal strength attenuation characteristics with height, the spatial height corresponding to the attenuation slope mutation point is used as the dividing benchmark: the area where the attenuation slope is higher than the critical value is defined as the low-altitude area (signal rapid attenuation area), and the area where the attenuation slope is lower than the critical value is defined as the medium-high altitude area (signal gentle attenuation area).

[0067] Step 403 : Based on the modulation distortion characteristics caused by the multipath effect, a short-interval dense activation timing rule is allocated to the low-altitude area, and a long-interval sparse activation timing rule is allocated to the medium- and high-altitude areas.

[0068] In this step, the short-interval dense activation timing rule refers to a millisecond-level non-uniform trigger sequence designed for areas with significant multipath effects; the long-interval sparse activation timing rule refers to a hundred-millisecond-level non-uniform trigger sequence designed for areas with stable signals.

[0069] In this embodiment, based on the spatial distribution weights of the multipath effect modulation distortion characteristics, short-interval dense timing rules are assigned to low-altitude areas (such as generating an increasing interval sequence according to the Fibonacci sequence) to match the fast-changing characteristics of microsecond signals caused by building reflections; long-interval sparse timing rules are assigned to medium and high-altitude areas (such as generating an interval sequence according to a prime number sequence) to adapt to the stable transmission characteristics of millisecond signals in open airspace.

[0070] Step 404 : generating interference unit activation sequences corresponding to the low altitude area and the middle and high altitude area respectively according to the short interval dense activation sequence rule and the long interval sparse activation sequence rule within the divided activation time window.

[0071] In this step, the activation sequence of the interference unit is a non-uniform time interval sequence that controls the emission timing of the electromagnetic shielding array unit, and its generation rule is strictly bound to the spatial area characteristics.

[0072] In this embodiment, within the activation time window divided in step 301, a short-interval dense timing sequence (such as a 1-3-5 millisecond cycle) is generated for the low-altitude area unit group, and a long-interval sparse timing sequence (such as an 8-13-21 millisecond single trigger) is generated for the medium- and high-altitude area unit group, so that the interference signal emission rhythm is dynamically matched with the spatial physical field characteristics.

[0073] As another embodiment, according to step 304, within the activation time window, controlling the interference unit group to transmit a matching interference signal type according to the interference unit activation timing to form a periodic dynamic interference pattern synchronized with the navigation signal transmission period includes: Step 501: When the interference signal type assigned to the interference unit group is a pseudo-random fluctuation signal, within the activation time window, the interference unit group is triggered according to the non-uniform time interval activation sequence to generate a fluctuation signal with random amplitude jumps.

[0074] In this step, the fluctuation signal with random amplitude jumps refers to an interference waveform generated by non-uniform timing triggering, and its signal amplitude jumps irregularly within a preset reference value range, which is used to destroy the amplitude stability of the navigation signal.

[0075] In this embodiment, when the interference unit group is assigned the pseudo-random fluctuation signal type, the unit group is triggered to operate according to a non-uniform activation sequence (e.g., a short, closely spaced sequence) within the activation time window generated in step 404. At each triggering moment, an electromagnetic wave with a randomly fluctuating amplitude is generated. The amplitude of the fluctuation dynamically fluctuates within a preset reference range, forming an interference waveform that interferes with the navigation signal amplitude stability.

[0076] Step 502: When the interference signal type assigned to the interference unit group is a frequency offset signal, within the activation time window, the interference unit group is triggered according to the non-uniform time interval activation sequence to generate a modulation signal with a periodically offset carrier frequency.

[0077] In this step, the modulation signal with periodic carrier frequency offset refers to an interference waveform in which the carrier frequency fluctuates periodically around the center frequency point, and interference is achieved by destroying the carrier frequency stability of the navigation signal.

[0078] In this embodiment, when a jamming element group is assigned a frequency offset signal type, it is triggered within the activation time window in a non-uniform sequence (e.g., a sparse sequence with long intervals). Each triggering generates an electromagnetic wave with a periodic carrier frequency offset. The offset period is synchronized with the triggering sequence, forming an interference field that interferes with the navigation signal's frequency synchronization mechanism.

[0079] Step 503: When the interference signal type assigned to the interference unit group is a phase modulation signal, the interference unit group is triggered according to the non-uniform time interval activation sequence within the activation time window to generate a phase mutation waveform.

[0080] In this step, the phase mutation waveform refers to an interference waveform in which the signal phase angle undergoes an instantaneous jump, and interference is achieved by destroying the phase continuity of the navigation signal.

[0081] In this embodiment, when the interference unit group is assigned a phase modulation signal type, the unit group is triggered in a non-uniform timing sequence within the activation time window. Each trigger generates an electromagnetic wave with an instantaneous phase angle jump. The jump angle is randomly selected within a preset range, creating interference with the phase lock mechanism of the navigation signal.

[0082] In step 504, the fluctuation signal with random amplitude jumps, the modulation signal with periodic carrier frequency offset and the phase mutation waveform are superimposed in three-dimensional space to form a periodic dynamic interference pattern synchronized with the navigation signal transmission period.

[0083] In this embodiment, the amplitude-jumping fluctuation signal generated in the low-altitude area (step 501), the carrier frequency offset modulation signal in the mid- and high-altitude areas (step 502), and the phase-jump waveform in the transitional airspace (step 503) are superimposed according to spatial coordinates. The amplitude-jumping signal dominates in densely built-up areas, the carrier frequency offset signal dominates in open areas, and the phase-jump signal serves as a bridge in the transitional airspace. A time window synchronization mechanism aligns the superimposed waveform with the navigation signal period, forming a dynamic interference pattern with full coverage.

[0084] As another embodiment, according to step 103, converting the periodic dynamic interference pattern into directional spatial interference energy by distributing the spatial gradient barriers of the electromagnetic shielding array includes: Step 601: Configure the unit space arrangement structure of the electromagnetic shielding array according to the three-dimensional spatial characteristics of the drone activity area, wherein the low-altitude area adopts the first unit spacing, and the medium and high altitude areas adopt the second unit spacing, and the first unit spacing is smaller than the second unit spacing.

[0085] In this step, the three-dimensional spatial characteristics refer to the terrain, building distribution and electromagnetic environment characteristics of the drone activity area; the unit space arrangement structure is the physical topology of the electromagnetic shielding array, and the directional control of interference energy is achieved through differentiated unit spacing.

[0086] In this embodiment, based on the three-dimensional spatial characteristics of the target airspace (such as building density and open area distribution), a first unit spacing is configured for low-altitude areas (dense arrangement enhances signal reflection), and a second unit spacing is configured for medium- and high-altitude areas (sparse arrangement optimizes directional propagation). Designing the first unit spacing smaller than the second unit spacing results in high-density interference unit clusters in low-altitude areas and low-density directional propagation channels in medium- and high-altitude areas.

[0087] Step 602 : Map the periodic dynamic interference pattern to a spatial gradient barrier distribution, wherein the pseudo-random fluctuation signal is mapped to the low altitude region and the frequency offset signal is mapped to the mid-to-high altitude region.

[0088] In this step, the spatial gradient barrier distribution refers to the intensity gradient structure of the interference energy in three-dimensional space, and the directional energy distribution is achieved by binding the signal type with the spatial area.

[0089] In this embodiment, the periodic dynamic interference pattern generated in step 504 is mapped to a spatial distribution: the pseudo-random fluctuation signal (amplitude jump waveform) is mapped to a low-altitude building-dense area, and the interference intensity is enhanced by using building reflection; the frequency offset signal (carrier frequency offset waveform) is mapped to a medium- and high-altitude open area, and directional propagation is achieved through sparse unit arrangement.

[0090] In step 603, based on the unit space arrangement structure, a dense interference intensity distribution is formed in the low altitude area, and a sparse interference intensity distribution is formed in the middle and high altitude areas, so that the high interference intensity areas and low interference intensity areas alternately arranged in the three-dimensional space constitute directional spatial interference energy.

[0091] In this embodiment, based on the unit space arrangement structure: a high-intensity interference field (signal reflection superposition) is formed in the low-altitude area through dense unit arrangement, and a low-intensity interference field (directional radiation) is formed in the medium and high-altitude areas through sparse unit arrangement; by alternating high / low intensity areas in three-dimensional space (such as the junction of building areas and open areas), a directional energy channel pointing to the drone receiving antenna is constructed.

[0092] As another embodiment, according to step 104, controlling the directional spatial interference energy to be continuously applied to the navigation signal receiving path of the target UAV to interfere with the navigation signal of the target UAV includes: Step 701: Acquire the signal reception azimuth characteristics of the target UAV, wherein the signal reception azimuth characteristics include the pointing angle characteristics of the receiving antenna and the spatial distribution characteristics of the received signal strength.

[0093] In this step, the signal reception azimuth characteristics include the pointing angle characteristics of the receiving antenna (the spatial angle of the antenna main lobe radiation direction) and the spatial distribution characteristics of the received signal strength (the attenuation gradient of the signal energy in three-dimensional space), which are used to locate the spatial direction of the drone navigation signal receiving path.

[0094] In this embodiment, by analyzing the intensity peak distribution of the drone's received signal, the antenna pointing angle characteristics (such as the horizontal azimuth angle and pitch angle) are analyzed; at the same time, the attenuation gradient characteristics of the signal strength in space are extracted (such as the concentrated intensity in the building reflection area and the dispersed intensity in the open area), and a spatial model of the signal reception path is established.

[0095] Step 702 : Matching the low-altitude area interference unit group and the mid-high altitude area interference unit group in the spatial gradient barrier distribution of the electromagnetic shielding array according to the pointing angle characteristics.

[0096] In this step, matching the interference unit group refers to the operation of aligning the low-altitude area interference unit group (building dense area unit) and the medium- and high-altitude area interference unit group (open area unit) in the electromagnetic shielding array with the spatial direction of the receiving path based on the antenna pointing angle characteristics.

[0097] In this embodiment, based on the pointing angle characteristics (such as the pitch angle ≤ 30°), the low-altitude area interference unit group (dense units around the substation) is activated; based on the pitch angle > 30°, the medium and high-altitude area interference unit group (sparse units in the open area of ​​the transmission line) is activated, so that the interference energy propagation direction is accurately matched with the antenna main lobe direction.

[0098] Step 703, based on the distribution of high interference intensity areas and low interference intensity areas, dynamically adjust the directional spatial interference energy projection ratio within the matching interference unit group, and calibrate the adjusted directional spatial interference energy projection ratio according to the interference signal type of the periodic dynamic interference pattern.

[0099] In this step, the interference energy projection ratio is the intensity distribution coefficient of the directional interference energy in space, and its dynamic adjustment and calibration are achieved through the coordinated distribution of high / low interference intensity areas and interference signal types.

[0100] In this embodiment, based on the distribution of high / low interference intensity areas: the projection ratio is increased in the building reflection-dominated area (high-intensity area), and the projection ratio is reduced in the open directional propagation area (low-intensity area); at the same time, the projection ratio is calibrated according to the interference signal type of the periodic dynamic interference pattern, the pseudo-random fluctuation signal trigger ratio is increased, and the frequency offset signal trigger ratio is reduced.

[0101] Step 704, based on the calibrated directional spatial interference energy projection ratio, through the spatial synergy of the low-altitude area interference unit group and the directional propagation synergy of the medium and high altitude area interference unit group, a continuous interference chain covering the target UAV's motion trajectory is generated in three-dimensional space to complete the navigation signal interference of the target UAV.

[0102] In this step, the continuous interference chain is a blind-spot-free interference field constructed in three-dimensional space by the spatial synergy of the low-altitude unit group (superposition of building reflection waves) and the directional propagation synergy of the medium and high-altitude unit group (beam directional focusing).

[0103] In this embodiment, based on the calibrated projection ratio: the low-altitude area unit group forms a building reflection enhancement interference chain through the superposition of dense unit reflections, and the medium and high-altitude area unit group forms a beam focusing interference chain through sparse unit directional radiation; the two types of interference chains are seamlessly connected in the airspace transition zone, covering the drone's movement trajectory and continuously blocking the navigation signal reception path.

[0104] Figure 2 This application provides a structural diagram of a UAV navigation signal jamming system based on an electromagnetic shielding array, such as Figure 2 As shown, the system includes: Identification module 21, used to monitor the navigation signals sent by the target drone in the drone activity area and identify the positioning information transmission characteristics contained in the navigation signals; A generating module 22 is configured to generate a periodic dynamic interference pattern synchronized with a navigation signal transmission period based on the positioning information transmission characteristics; A conversion module 23, configured to convert the periodic dynamic interference pattern into directional spatial interference energy through the spatial gradient barrier distribution of the electromagnetic shielding array; The control module 24 is used to control the directional spatial interference energy to be continuously applied to the navigation signal receiving path of the target UAV to complete the navigation signal interference of the target UAV.

[0105] Figure 2 The UAV navigation signal jamming system based on electromagnetic shielding array can be performed Figure 1 The implementation principle and technical effects of the electromagnetic shielding array-based UAV navigation signal jamming method described in the illustrated embodiment will not be elaborated on here. The specific manner in which each module and unit performs operations in the electromagnetic shielding array-based UAV navigation signal jamming system described in the above embodiment has been described in detail in the relevant embodiments of the method and will not be elaborated on here.

[0106] In one possible design, Figure 2 The UAV navigation signal jamming system based on electromagnetic shielding array of the embodiment shown can be implemented as a computing device, such as Figure 3 As shown, the computing device may include a storage component 31 and a processing component 32; The storage component 31 stores one or more computer instructions, wherein the one or more computer instructions are called and executed by the processing component 32 .

[0107] The processing component 32 is used for the above Figure 1 The embodiment provides a method for jamming UAV navigation signals based on an electromagnetic shielding array.

[0108] The processing component 32 may include one or more processors to execute computer instructions to complete all or part of the steps in the above method. Of course, the processing component may also be implemented as one or more application-specific integrated circuits (ASICs), digital signal processors (DSPs), digital signal processing devices (DSPDs), programmable logic devices (PLDs), field programmable gate arrays (FPGAs), controllers, microcontrollers, microprocessors, or other electronic components to perform the above method.

[0109] The storage component 31 is configured to store various types of data to support operations at the terminal. The storage component can be implemented by any type of volatile or non-volatile memory device, or a combination thereof, such as static random access memory (SRAM), electrically erasable programmable read-only memory (EEPROM), erasable programmable read-only memory (EPROM), programmable read-only memory (PROM), read-only memory (ROM), magnetic memory, flash memory, magnetic disk, or optical disk.

[0110] Of course, a computing device may also include other components, such as input / output interfaces, display components, communication components, etc.

[0111] The input / output interface provides an interface between the processing component and the peripheral interface module, which can be an output device, an input device, etc.

[0112] The communication component is configured to facilitate, among other things, wired or wireless communications between the computing device and other devices.

[0113] Among them, the computing device can be a physical device or an elastic computing host provided by a cloud computing platform, etc. In this case, the computing device can refer to a cloud server, and the above-mentioned processing components, storage components, etc. can be basic server resources rented or purchased from the cloud computing platform.

[0114] The present application also provides a computer storage medium storing a computer program, wherein the computer program can achieve the above-mentioned Figure 1 The embodiment shown is a method for jamming UAV navigation signals based on an electromagnetic shielding array.

[0115] Those skilled in the art will clearly understand that, for the convenience and brevity of description, the specific working processes of the systems, devices and units described above can refer to the corresponding processes in the aforementioned method embodiments and will not be repeated here.

[0116] The device embodiments described above are merely illustrative. The units described as separate components may or may not be physically separate, and the components shown as units may or may not be physical units, i.e., they may be located in one location or distributed across multiple network units. Some or all of the modules may be selected based on actual needs to achieve the objectives of the present embodiment. Persons of ordinary skill in the art will be able to understand and implement the present invention without inventive effort.

[0117] Through the above description of the embodiments, those skilled in the art will clearly understand that each embodiment can be implemented using software plus a necessary general-purpose hardware platform, or of course, hardware. Based on this understanding, the essence of the above technical solution, or the portion that contributes to the prior art, can be embodied in the form of a software product. This computer software product can be stored in a computer-readable storage medium, such as ROM / RAM, a magnetic disk, or an optical disk, and includes a number of instructions for causing a computer device (such as a personal computer, server, or network device) to execute the methods described in each embodiment or certain portions of the embodiments.

[0118] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A method for jamming UAV navigation signals based on an electromagnetic shielding array, characterized in that: include: Monitoring navigation signals emitted by target drones in the drone activity area and identifying positioning information transmission characteristics contained in the navigation signals; generating a periodic dynamic interference pattern synchronized with a navigation signal transmission period based on the positioning information transmission characteristics; converting the periodic dynamic interference pattern into directional spatial interference energy through spatial gradient barrier distribution of an electromagnetic shielding array; The directional spatial interference energy is controlled to be continuously applied to the navigation signal receiving path of the target UAV to complete the navigation signal interference of the target UAV.

2. The method according to claim 1, characterized in that Monitoring navigation signals emitted by target drones in the drone activity area and identifying positioning information transmission characteristics contained in the navigation signals, including: The mixed waveform of the navigation signal emitted by the target UAV is collected by using multiple sensor arrays pre-deployed in the three-dimensional space of the UAV activity area; Performing signal decoupling on the mixed waveform of the navigation signal to separate basic signal features, wherein the basic signal features include signal fluctuation change features, signal coding structure features, and signal strength distribution features; According to the basic signal characteristics, the positioning information transmission characteristics of the target UAV are analyzed, wherein the positioning information transmission characteristics include positioning information update period characteristics, positioning information carrying mode characteristics and positioning information modulation characteristics.

3. The method according to claim 1, characterized in that Generating a periodic dynamic interference pattern synchronized with the navigation signal transmission period according to the positioning information transmission characteristics, comprising: Based on the positioning information update period feature in the positioning information transmission feature, determining a time base of an interference signal and dividing activation time windows of multiple interference units in an electromagnetic shielding array, wherein the interference signal includes a pseudo-random fluctuation signal, a frequency offset signal, and a phase modulation signal; Defining the divided multiple interference units into multiple interference unit groups, and assigning an interference signal type to each interference unit group according to the characteristics of the positioning information carrying method; According to the spatial dependence of the modulation characteristics of the positioning information, the activation time sequence of the interference unit with non-uniform time intervals is generated; In the activation time window, the interference unit group is controlled to transmit matching interference signal types according to the interference unit activation sequence, thereby forming a periodic dynamic interference pattern synchronized with the navigation signal transmission period.

4. The method according to claim 3, characterized in that According to the spatial dependence of the modulation characteristics of the positioning information, the activation sequence of the interference unit with non-uniform time intervals is generated, including: Analyzing spatial dependency features in the positioning information modulation features, the spatial dependency features including signal strength attenuation with height and modulation distortion features caused by multipath effects; Based on the signal strength attenuation characteristics with altitude, the target drone activity area is divided into a low-altitude area and a medium-high altitude area. The low-altitude area is a spatial range with an altitude of less than or equal to 100 meters, and the medium-high altitude area is a spatial range with an altitude of more than 100 meters. Based on the modulation distortion characteristics caused by the multipath effect, a short-interval dense activation timing rule is assigned to the low-altitude area, and a long-interval sparse activation timing rule is assigned to the medium- and high-altitude areas; In the divided activation time windows, according to the short interval dense activation timing rule and the long interval sparse activation timing rule, the interference unit activation timings corresponding to the low altitude area and the middle and high altitude area are generated respectively.

5. The method according to claim 3, characterized in that Controlling the interference unit group to transmit a matching interference signal type according to the interference unit activation sequence within the activation time window to form a periodic dynamic interference pattern synchronized with the navigation signal transmission period, including: When the interference signal type assigned to the interference unit group is a pseudo-random fluctuation signal, within the activation time window, the interference unit group is triggered according to the non-uniform time interval activation sequence to generate a fluctuation signal with a random amplitude jump; When the interference signal type assigned to the interference unit group is a frequency offset signal, within the activation time window, the interference unit group is triggered according to the non-uniform time interval activation timing to generate a modulation signal with a periodic carrier frequency offset; When the interference signal type assigned to the interference unit group is a phase modulation signal, within the activation time window, the interference unit group is triggered according to the non-uniform time interval activation timing to generate a phase mutation waveform; The fluctuation signal with random amplitude jump, the modulation signal with periodic carrier frequency offset and the phase mutation waveform are superimposed in three-dimensional space to form a periodic dynamic interference pattern synchronized with the navigation signal transmission period.

6. The method according to claim 1, characterized in that The periodic dynamic interference pattern is converted into directional spatial interference energy through the spatial gradient barrier distribution of the electromagnetic shielding array, including: According to the three-dimensional spatial characteristics of the drone's activity area, the unit space arrangement structure of the electromagnetic shielding array is configured, wherein the low-altitude area adopts a first unit spacing, and the medium and high altitude areas adopt a second unit spacing, and the first unit spacing is smaller than the second unit spacing; Map the periodic dynamic interference pattern to the spatial gradient barrier distribution, where the pseudo-random fluctuation signal is mapped to the low-altitude area and the frequency offset signal is mapped to the medium- and high-altitude area; Based on the unit space arrangement structure, a dense interference intensity distribution is formed in the low-altitude area, and a sparse interference intensity distribution is formed in the medium and high-altitude areas, so that the high interference intensity areas and low interference intensity areas alternately arranged in the three-dimensional space constitute directional spatial interference energy.

7. The method according to claim 1, characterized in that Controlling the directional spatial interference energy to be continuously applied to the navigation signal receiving path of the target UAV to complete the navigation signal interference of the target UAV, including: Obtaining the signal reception azimuth characteristics of the target UAV, wherein the signal reception azimuth characteristics include the pointing angle characteristics of the receiving antenna and the spatial distribution characteristics of the received signal strength; According to the pointing angle characteristics, matching the low-altitude area interference unit group and the medium-high altitude area interference unit group in the spatial gradient barrier distribution of the electromagnetic shielding array; Based on the distribution of high and low interference intensity areas, the directional spatial interference energy projection ratio is dynamically adjusted within the matching interference unit group. At the same time, the adjusted directional spatial interference energy projection ratio is calibrated according to the interference signal type of the periodic dynamic interference pattern. Based on the calibrated directional spatial interference energy projection ratio, through the spatial synergy of the low-altitude area interference unit group and the directional propagation synergy of the medium and high-altitude area interference unit group, a continuous interference chain covering the motion trajectory of the target UAV is generated in three-dimensional space to complete the navigation signal interference of the target UAV.

8. A UAV navigation signal jamming system based on an electromagnetic shielding array, characterized in that: include: an identification module for monitoring navigation signals emitted by target drones in the drone activity area and identifying positioning information transmission characteristics contained in the navigation signals; A generating module, configured to generate a periodic dynamic interference pattern synchronized with a navigation signal transmission period according to the positioning information transmission characteristics; a conversion module for converting the periodic dynamic interference pattern into directional spatial interference energy through the spatial gradient barrier distribution of the electromagnetic shielding array; The control module is used to control the directional spatial interference energy to be continuously applied to the navigation signal receiving path of the target UAV to complete the navigation signal interference of the target UAV.

9. A computing device, characterized in that It includes a processing component and a storage component; the storage component stores one or more computer instructions; the one or more computer instructions are used to be called and executed by the processing component to implement a drone navigation signal interference method based on an electromagnetic shielding array as described in any one of claims 1 to 7.

10. A computer storage medium, characterized in that A computer program is stored, and when the computer program is executed by a computer, a method for jamming a UAV navigation signal based on an electromagnetic shielding array as described in any one of claims 1 to 7 is implemented.

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