An unmanned aerial vehicle navigation signal jamming method and system based on an electromagnetic shielding array

Abstract

The application provides a UAV navigation signal interference method and system based on an electromagnetic shielding array. First, the target UAV navigation signal is monitored, and the positioning information transmission characteristics in the navigation signal are identified. Then, a periodic dynamic interference mode synchronized with the transmission period of the navigation signal is generated according to the positioning information transmission characteristics. Next, the periodic dynamic interference mode is converted into directional spatial interference energy through the spatial gradient barrier distribution of the electromagnetic shielding array. Finally, the directional spatial interference energy is continuously applied to the navigation signal receiving path of the UAV to complete the navigation signal interference of the UAV. The technical solution provided by the application not only effectively breaks the frequency hopping anti-interference mechanism of the UAV and significantly reduces the invalid energy consumption, but also improves the interference efficiency and avoids the false interference on non-target devices.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of unmanned aerial vehicle positioning countermeasures, and particularly relates to an unmanned aerial vehicle navigation signal interference method and system based on an electromagnetic shielding array. BACKGROUND

[0002] In the field of sensitive airspace, illegally intruding unmanned aerial vehicles pose a serious threat to public safety and critical infrastructure.

[0003] The current mainstream technical solution adopts a full-band suppression jamming mechanism, which transmits a wide-spectrum noise signal through a high-power signal generator, and cooperates with an omnidirectional radiating antenna to perform carpet-like energy coverage on the airspace. This solution attempts to make the unmanned aerial vehicle navigation system lose lock through indiscriminate signal suppression, and the interference range can cover the communication and positioning frequency bands commonly used by civilian unmanned aerial vehicles.

[0004] However, such a solution has three essential defects. First, full-band energy coverage will interfere with legal radio services such as civil aviation control communication and emergency rescue channels, violating frequency spectrum management regulations. Second, continuous high-power output leads to a sharp increase in device 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 unmanned aerial vehicles, and the interference effect is immediately ineffective when the target unmanned aerial vehicle automatically switches the communication frequency band. SUMMARY

[0005] The present application provides an unmanned aerial vehicle navigation signal interference method and system based on an electromagnetic shielding array, to solve the problems of indiscriminate signal blocking, high power consumption, and unsustainable operation of the static interference mode in the prior art full-band suppression jamming solution.

[0006] In a first aspect, the present application provides an unmanned aerial vehicle navigation signal interference method based on an electromagnetic shielding array, comprising:

[0007] Monitoring the navigation signal emitted by the target unmanned aerial vehicle in the unmanned aerial vehicle activity area, and identifying the positioning information transmission characteristics contained in the navigation signal;

[0008] According to the positioning information transmission characteristics, a periodic dynamic interference mode synchronized with the navigation signal transmission period is generated;

[0009] The periodic dynamic interference mode is converted into directional spatial interference energy through the spatial gradient barrier distribution of the electromagnetic shielding array;

[0010] The directional spatial interference energy is continuously applied to the navigation signal receiving path of the target unmanned aerial vehicle to complete the navigation signal interference of the target unmanned aerial vehicle.

[0011] Optionally, a navigation signal emitted by a target UAV in the UAV activity area is monitored, and a positioning information transmission feature contained in the navigation signal is identified, including:

[0012] A mixed waveform of the navigation signal emitted by the target UAV is collected by using a plurality of sensor arrays deployed in advance in a three-dimensional space of the UAV activity area;

[0013] The mixed waveform of the navigation signal is signal decoupled to separate out a basic signal feature, including a signal fluctuation change feature, a signal coding structure feature, and a signal intensity distribution feature;

[0014] According to the basic signal feature, a positioning information transmission feature of the target UAV is analyzed, wherein the positioning information transmission feature includes a positioning information update period feature, a positioning information carrying mode feature, and a positioning information modulation feature.

[0015] Optionally, according to the positioning information transmission feature, a periodic dynamic interference pattern synchronized with the navigation signal transmission period is generated, including:

[0016] Based on the positioning information update period feature in the positioning information transmission feature, a time reference of an interference signal is determined, and an activation time window of a plurality of interference units in an electromagnetic shielding array is divided, wherein the interference signal includes a pseudo-random fluctuation signal, a frequency offset signal, and a phase modulation signal;

[0017] The plurality of interference units divided are defined as a plurality of interference unit groups, and a type of interference signal of each interference unit group is assigned according to the positioning information carrying mode feature;

[0018] According to a spatial dependence of the positioning information modulation feature, a non-uniform time interval interference unit activation timing is generated;

[0019] In the activation time window, the interference unit groups are controlled to emit matched interference signal types according to the interference unit activation timing, forming a periodic dynamic interference pattern synchronized with the navigation signal transmission period.

[0020] Optionally, according to the spatial dependence of the positioning information modulation feature, a non-uniform time interval interference unit activation timing is generated, including:

[0021] The spatial dependence feature in the positioning information modulation feature is analyzed, including a signal intensity attenuation feature with height, and a modulation distortion feature caused by multipath effect;

[0022] According to the signal strength attenuation characteristics with height, 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 a height less than or equal to 100 meters, and the medium-high altitude area is a spatial range with a height greater than 100 meters;

[0023] Based on the modulation distortion characteristics caused by the multipath effect, the low-altitude area is assigned a short-interval dense activation timing rule, and the medium-high altitude area is assigned a long-interval sparse activation timing rule;

[0024] In the divided activation time window, the short-interval dense activation timing rule and the long-interval sparse activation timing rule are used to generate the interference unit activation timing corresponding to the low-altitude area and the medium-high altitude area, respectively.

[0025] Optionally, in the activation time window, the interference unit group is controlled to emit a matching interference signal type according to the interference unit activation timing, forming a periodic dynamic interference pattern synchronized with the navigation signal transmission period, including:

[0026] When the interference signal type assigned to the interference unit group is a pseudo-random fluctuation signal, the interference unit group is triggered according to the non-uniform time interval activation timing in the activation time window to generate a fluctuation signal with random amplitude jumps;

[0027] When the interference signal type assigned to the interference unit group is a frequency offset signal, the interference unit group is triggered according to the non-uniform time interval activation timing in the activation time window to generate a modulation signal with periodic carrier frequency offset;

[0028] 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 timing in the activation time window to generate a phase mutation waveform;

[0029] 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.

[0030] Optionally, the periodic dynamic interference pattern is converted into directional spatial interference energy through the spatial gradient barrier distribution of the electromagnetic shielding array, including:

[0031] According to the three-dimensional spatial characteristics of the UAV activity area, the unit spatial arrangement structure of the electromagnetic shielding array is configured, wherein the low-altitude area adopts a first unit spacing, the medium-high altitude area adopts a second unit spacing, and the first unit spacing is less than the second unit spacing;

[0032] mapping the periodic dynamic interference pattern to a spatial gradient barrier distribution, wherein a pseudo-random fluctuation signal is mapped to a low-altitude region and a frequency offset signal is mapped to a mid-high altitude region;

[0033] Based on the unit spatial arrangement structure, a dense interference intensity distribution is formed in the low-altitude region and a sparse interference intensity distribution is formed in the mid-high altitude region, so that the high interference intensity region and the low interference intensity region arranged alternately in the three-dimensional space form a directional spatial interference energy.

[0034] Optionally, the control of the directional spatial interference energy continuously applied to the navigation signal receiving path of the target UAV to complete the navigation signal interference of the target UAV comprises:

[0035] Obtaining the signal receiving orientation characteristics of the target UAV, the signal receiving orientation characteristics comprising the pointing angle characteristics of the receiving antenna and the receiving signal strength spatial distribution characteristics;

[0036] According to the pointing angle characteristics, matching the low-altitude region interference unit group and the mid-high altitude region interference unit group in the spatial gradient barrier distribution of the electromagnetic shielding array;

[0037] Based on the distribution of the high interference intensity region and the low interference intensity region, dynamically adjusting the projection ratio of the directional spatial interference energy in the matched interference unit group, and simultaneously calibrating the adjusted directional spatial interference energy projection ratio according to the interference signal type of the periodic dynamic interference pattern;

[0038] Based on the calibrated directional spatial interference energy projection ratio, through the spatial synergy of the low-altitude region interference unit group and the directional propagation synergy of the mid-high altitude region interference unit group, a continuous interference chain covering the motion trajectory of the target UAV is generated in the three-dimensional space to complete the navigation signal interference of the target UAV.

[0039] In a second aspect, the present application provides an unmanned aerial vehicle navigation signal interference system based on an electromagnetic shielding array, comprising:

[0040] The identification module is used for monitoring the navigation signal emitted by the target UAV in the unmanned aerial vehicle activity area, and identifying the positioning information transmission characteristics contained in the navigation signal;

[0041] The generation module is used for generating a periodic dynamic interference pattern synchronized with the navigation signal transmission period according to the positioning information transmission characteristics;

[0042] The conversion module is used for converting the periodic dynamic interference pattern into directional spatial interference energy through the spatial gradient barrier distribution of the electromagnetic shielding array;

[0043] A control module is configured 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.

[0044] 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 the method for interfering with the navigation signal of the UAV based on the electromagnetic shielding array as described in the first aspect.

[0045] In a fourth aspect, the present application provides a computer storage medium, which stores a computer program; when the computer program is executed by a computer, the method for interfering with the navigation signal of the UAV based on the electromagnetic shielding array as described in the first aspect is implemented.

[0046] The present application realizes the precise synchronization control of the interference mode by monitoring the navigation signal of the target UAV and identifying the positioning information transmission characteristics. The periodic dynamic interference mode strictly synchronized with the transmission period of the navigation signal is generated to ensure that the interference energy continuously covers the signal receiving window of the target UAV in the time domain; further, the dynamic interference mode is converted into directional interference energy with high / low intensity alternation in three-dimensional space through the spatial gradient barrier distribution of the electromagnetic shielding array, so that the interference energy is precisely focused on the navigation signal receiving path of the target UAV, which significantly improves the interference efficiency and avoids the false interference on the non-target device.

[0047] Further, the interference unit activation time window is divided based on the positioning information update period characteristics, and three types of interference signal types, i.e., pseudo-random fluctuation, frequency offset and phase modulation, are assigned to different interference unit groups in combination with the positioning information carrying mode characteristics, so as to realize the deep matching of the interference strategy and the characteristics of the navigation signal of the UAV. The non-uniform time interval activation timing is generated through the spatial dependency characteristics, so that the interference signal transmission timing dynamically adapts to the complex environmental characteristics such as the multipath effect of urban buildings or the signal attenuation in open space, and finally forms a dynamic interference mode strictly synchronized with the navigation signal period in the activation time window, which effectively cracks the frequency hopping anti-interference mechanism of the UAV and significantly reduces the invalid energy consumption.

[0048] These aspects or other aspects of the present application will be more apparent in the following description of the embodiments. BRIEF DESCRIPTION OF DRAWINGS

[0049] In order to more clearly illustrate the technical solutions of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or prior art description. Obviously, the drawings in the following description are some embodiments of the present application, and other drawings can also be obtained by those skilled in the art without any creative effort.

[0050] Figure 1 A flow chart of a method for interfering with a navigation signal of a UAV based on an electromagnetic shielding array is shown in the present application.

[0051] Figure 2 A structural schematic diagram of a system for interfering with a navigation signal of a UAV based on an electromagnetic shielding array is shown in the present application.

[0052] Figure 3 A structural schematic diagram of a computing device is shown in the present application. DETAILED DESCRIPTION

[0053] In order to better understand the present application, the technical solutions in the present application will be described clearly and completely below in conjunction with the accompanying drawings in the present application.

[0054] In some of the processes described in the specification and the claims of the present application and the above-mentioned accompanying drawings, a plurality of operations are included in a specific order, but it should be clearly understood that these operations can be executed or in parallel with the order in which they appear in this text, the serial numbers of the operations such as 101, 102, etc. are only used to distinguish different operations, and the serial numbers themselves do not represent any execution order. In addition, these processes can include more or fewer operations, and the operations can be executed in sequence or in parallel. It should be noted that the "first", "second", etc. in this text are used to distinguish different messages, devices, modules, etc. and do not represent the order of precedence. Also, "first" and "second" are not of different types.

[0055] The technical solutions in the present application will be described clearly and completely below in conjunction with the accompanying drawings in the present application. Obviously, the described embodiments are only some of the embodiments of the present application, not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of the present application.

[0056] Figure 1 A flow chart of a method for interfering with a navigation signal of a UAV based on an electromagnetic shielding array is shown in the present application. Figure 1 As shown in the present application, the method comprises:

[0057] Step 101, monitoring the navigation signal emitted by the target UAV in the UAV activity area, and identifying the positioning information transmission characteristics contained in the navigation signal.

[0058] In this step, the navigation signal refers to the radio waveform emitted by the target UAV for positioning, containing carrier frequency, modulation coding and positioning data; the positioning information transmission feature is composed of positioning information update period feature (time regularity of positioning data broadcast), positioning information carrying mode feature (positioning data encapsulation structure in signal) and positioning information modulation feature (distortion law of signal waveform caused by environment), which is used to analyze the signal transmission mechanism of UAV positioning system.

[0059] In this embodiment, the mixed waveform of the navigation signal emitted by the UAV is captured synchronously by the three-dimensional sensor array pre-deployed in the target airspace, and the mixed waveform is decoupled by using waveform separation technology to separate out the signal fluctuation change feature (reflecting the change trend of signal amplitude with time), signal coding structure feature (reflecting the navigation information coding rule) and signal intensity distribution feature (describing the signal spatial attenuation characteristic); the positioning information update period feature is identified based on the signal fluctuation change feature, and the positioning data broadcast period is determined by analyzing the peak value interval of the signal amplitude; the positioning information carrying mode feature is identified based on the signal coding structure feature, and the position data encapsulation form is judged by analyzing the repeated coding segment; the positioning information modulation feature is identified based on the signal intensity distribution feature, and the environmental interference mode is inferred by comparing the waveform distortion degree at different spatial positions, and finally the complete positioning information transmission feature is integrated and output.

[0060] For example, in the urban security scene, the sensor array deployed on the top of the high-rise building captures the mixed waveform of the GPS navigation signal emitted by the UAV. Through waveform separation technology, the signal fluctuation change feature shows a periodic amplitude jump every second, corresponding to the positioning information update period feature; the signal coding structure feature presents a fixed header identification coding sequence, corresponding to the carrying mode feature; the signal intensity distribution feature shows that the glass curtain wall reflection causes the low-altitude signal distortion rate to rise, corresponding to the spatial dependence of the modulation feature. This feature combination provides environmental adaptation parameters for subsequent dynamic interference.

[0061] Step 102, generating a periodic dynamic interference mode synchronized with the navigation signal transmission period according to the positioning information transmission feature.

[0062] In this step, the navigation signal transmission period refers to the fixed time interval rule of the target UAV positioning information broadcast; the periodic dynamic interference mode is a time-varying interference waveform combination emitted by the electromagnetic shielding array, which is strictly synchronized with the navigation signal period, containing pseudo-random fluctuation signal (amplitude irregular jump waveform), frequency offset signal (carrier frequency periodic change waveform) and phase modulation signal (phase mutation waveform), which is used to match the time domain features of the UAV positioning signal.

[0063] In this embodiment, the activation time window of the electromagnetic shielding array is updated based on the positioning information update period characteristic division, the array units are divided into multiple interference unit groups according to the spatial position, the interference signal type is allocated according to the positioning information carrying mode characteristic: the pseudo-random fluctuation signal corresponds to the head identification carrying mode, the frequency offset signal corresponds to the segmented embedding mode, and the phase modulation signal corresponds to the hybrid modulation mode; the non-uniform time interval activation timing is generated according to the spatial dependence of the positioning information modulation characteristic: the short interval dense triggering rule is used in the building dense area, and the long interval sparse triggering rule is used in the open area; in the activation time window, the unit group emits the matched interference signal type according to the non-uniform timing, and finally forms a dynamic interference mode synchronized with the navigation signal period.

[0064] For example, the positioning information transmission characteristics of the city security scene (low-altitude signal distortion caused by glass curtain wall reflection), the electromagnetic shielding array units are divided into three groups: the high-rise building top unit group is allocated a pseudo-random fluctuation signal (matching the GPS head identification carrying mode), the street layer unit group is allocated a frequency offset signal (corresponding to the segmented embedding mode), and the park open area unit group is allocated a phase modulation signal (adapted to the hybrid modulation characteristic). Based on the signal distortion characteristic, the unit group in the building area is triggered with a millisecond-level short interval timing, and the unit group in the open area is triggered with a hundred-millisecond-level long interval timing. When the UAV flies over the commercial area, the building unit group densely emits amplitude jump interference waves, and the open area unit group sparsely emits carrier frequency offset waves, forming a dynamic interference field strictly synchronized with the 1Hz update period of the GPS signal.

[0065] Step 103, converting the periodic dynamic interference mode into directional spatial interference energy through the spatial gradient barrier distribution of the electromagnetic shielding array.

[0066] In this step, the electromagnetic shielding array refers to a signal emitting device composed of multiple independently controllable interference units arranged in three-dimensional space; the spatial gradient barrier distribution is a gradually changing interference intensity structure formed by differentiating the unit spacing, in which the low-altitude area uses dense unit arrangement to enhance signal reflection, and the medium and high-altitude areas use sparse unit arrangement to optimize energy directional propagation; the directional spatial interference energy is a focused energy field formed by alternating arrangement of high and low interference intensity regions, and the energy propagation direction is aligned with the target UAV navigation signal receiving path.

[0067] 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 the building-dense area to enhance signal reflection capability, and sparse unit spacing is used in the open area to improve energy directivity; the periodic dynamic interference pattern generated in step 102 is mapped to the spatial distribution, the pseudo-random fluctuation signal is distributed to the low-altitude building area unit group, and the frequency offset signal is distributed to the medium-high altitude open area unit group; based on the unit arrangement structure, a high-intensity interference field is formed in the low-altitude area (dense unit reflection superposition), and a low-intensity interference field is formed in the medium-high altitude area (sparse unit directional radiation), and a directional energy channel pointing to the signal receiving path of the UAV is constructed through the alternating arrangement of high / low intensity areas in three-dimensional space.

[0068] For example, the dynamic interference pattern of the urban security scene (pseudo-random fluctuation signal in building area and frequency offset signal in open area), dense unit array with wavelength of one fourth is deployed around the glass curtain wall in the business district to enhance signal reflection and form a high-intensity interference area; sparse unit array with wavelength of one half is deployed in the open area of the park to optimize directional propagation and form a low-intensity interference area. When the target UAV passes through the transition airspace from the business district to the park, the high-intensity interference area (curtain wall reflection) and the low-intensity interference area (open directional propagation) are arranged alternately, and the energy is accurately focused on the direction of the UAV GPS receiving antenna, forming a blind area-free directional interference.

[0069] Step 104, control the directional spatial interference energy to continuously act on the navigation signal receiving path of the target UAV to complete the navigation signal interference of the target UAV.

[0070] 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 (antenna main lobe radiation direction angle) and the signal propagation path characteristics (direct and reflected path combination of the navigation signal to the UAV), which are used to determine the focusing direction of the interference energy.

[0071] In this embodiment, the spatial pointing characteristics of the receiving antenna are obtained by analyzing the peak value distribution of the UAV receiving signal strength; the spatial gradient barrier distribution of the electromagnetic shielding array is matched according to the pointing characteristics: the low-altitude building area is matched with the low-altitude area interference unit group, and the medium-high altitude open area is matched with the medium-high altitude area interference unit group; the projection ratio of the directional spatial interference energy is dynamically adjusted based on the distribution of high / low intensity areas: the projection intensity is increased in the building reflection dominant area, and the projection intensity is reduced in the open directional propagation area; through the spatial synergistic effect of the low-altitude unit group (building reflection wave superposition) and the directional propagation synergistic effect of the medium-high altitude unit group (beam directional focusing), a continuous interference chain covering the UAV motion trajectory is generated in three-dimensional space, realizing the continuous blocking of the navigation signal receiving path.

[0072] For example, in the context of urban security, the directional spatial interference energy is arranged alternately in high-intensity interference zones in commercial areas and low-intensity interference zones in parks. For a UAV flying from a commercial area to a park, the peak value of the received signal strength determines the antenna tilt angle pointing to the park. The reflection enhancement mode (increasing the projection ratio) of the glass curtain wall unit group in the commercial area is activated, and the directional focusing mode (reducing the projection ratio) of the unit group in the open area of the park is activated. When the UAV passes through the transition space between the building group and the park, the dense interference chain formed by the reflection of the curtain wall and the sparse interference chain formed by the directional beam seamlessly connect, and a continuous interference field is constructed on the UAV antenna pointing path, making the navigation signal reception function completely ineffective.

[0073] In summary, the present application generates a dynamic interference mode strictly synchronized with the navigation signal cycle by monitoring the target UAV navigation signal and analyzing its positioning information transmission characteristics, converts the interference mode into directional focusing energy using the spatial gradient barrier distribution of the electromagnetic shielding array, and finally generates a continuous and accurate blockage of the UAV navigation signal reception path through dynamic calibration of the projection ratio and coordinated interference chain generation.

[0074] As an implementable embodiment, according to step 101, the navigation signal emitted by the target UAV is monitored in the UAV activity area, and the positioning information transmission characteristics contained in the navigation signal are identified, including:

[0075] Step 201: Using multiple groups of sensor arrays pre-deployed in the three-dimensional space of the UAV activity area, the mixed waveform of the navigation signal emitted by the target UAV is collected.

[0076] In this step, multiple groups of sensor arrays refer to groups of coordinated signal capture devices deployed in a three-dimensional grid topology in the three-dimensional space, used to synchronously collect the composite electromagnetic signal 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, containing the time-domain superposition of direct signals, multipath reflection signals, and environmental noise.

[0077] In this embodiment, the three-dimensional sensor array pre-deployed in the target airspace (such as deployed on the top of a building, a ground monitoring station, and an aerial floating platform) synchronously captures the mixed waveform of the navigation signal emitted by the UAV. Each sensor in the array receives signals according to the spatial position difference, and aligns the sampling time sequence through a time synchronization module to form mixed waveform raw data containing the target signal direct component, building reflection multipath component, and electromagnetic environmental noise.

[0078] Step 202: Signal decoupling is performed on the mixed waveform of the navigation signal to separate out the basic signal characteristics, including signal fluctuation characteristics, signal coding structure characteristics, and signal intensity distribution characteristics.

[0079] In this step, signal decoupling is the process of extracting independent physical features in the mixed signal by waveform separation technology; signal fluctuation change feature is used to reflect the change trend of signal amplitude with time; signal coding structure feature is used to reflect the coding rule of navigation information in the signal; signal intensity distribution feature is used to describe the decay law of signal energy in space.

[0080] In this embodiment, the mixed waveform collected in step 201 is subjected to signal decoupling processing: the signal fluctuation change feature (the change curve of the amplitude with time is identified), the signal coding structure feature (the repeated coding segment sequence is extracted), and the signal intensity distribution feature (the signal energy attenuation slope at different spatial positions is analyzed) are separated by waveform separation technology; wherein the fluctuation change feature is obtained by time domain envelope extraction, the coding structure feature is identified by segment matching, and the intensity distribution feature is generated by spatial energy gradient analysis.

[0081] Step 203, according to the basic signal feature, analyzing the positioning information transmission feature of the target unmanned aerial vehicle, wherein the positioning information transmission feature includes positioning information update period feature, positioning information carrying mode feature and positioning information modulation feature.

[0082] In this step, the positioning information update period feature specifies the time interval rule of the positioning data broadcast; the positioning information carrying mode feature refers to the packaging structure of the position data in the signal; and the positioning information modulation feature refers to the distortion mode of the environment to the signal carrier.

[0083] In this embodiment, the transmission feature is analyzed based on the basic signal feature: the positioning information update period feature is determined by the periodic peak interval of the signal fluctuation change feature; the positioning information carrying mode feature is analyzed by the repeated segment arrangement rule of the signal coding structure feature (such as head identification packaging or segmented embedding); and the positioning information modulation feature is inversely deduced by the spatial distortion gradient of the signal intensity distribution feature (such as high-voltage electromagnetic field causing carrier frequency offset).

[0084] As another embodiment, according to step 102, according to the positioning information transmission feature, a periodic dynamic interference mode synchronized with the navigation signal transmission period is generated, including:

[0085] Step 301, based on the positioning information update period feature in the positioning information transmission feature, determining the time reference of the interference signal, and dividing the activation time window of a plurality of interference units in the electromagnetic shielding array, wherein the interference signal includes pseudo-random fluctuation signal, frequency offset signal and phase modulation signal.

[0086] In this step, the interference signal time reference refers to the interference timing synchronization starting point established according to the positioning information broadcast interval; and the active time window refers to the time period division in which the interference units in the electromagnetic shielding array are allowed to emit interference signals, and the total time length of which is aligned with the navigation signal transmission period.

[0087] In this embodiment, based on the positioning information update period feature (such as the Beidou signal second-level update rule) analyzed in step 203, the navigation signal transmission period is taken as the time reference, and is proportionally divided into multiple continuous time window units; each time window unit corresponds to the active period of a group of interference units in the electromagnetic shielding array, and a set of interference signal types (pseudo-random fluctuation signal, frequency offset signal, phase modulation signal) are defined as the subsequent allocation basis.

[0088] In step 302, the divided multiple interference units are defined as multiple interference unit groups, and the interference signal type of each interference unit group is allocated according to the positioning information carrying mode feature.

[0089] In this step, the interference unit group refers to the unit set in the electromagnetic shielding array that shares the same active time window.

[0090] In this embodiment, the interference units corresponding to the active time window units divided in step 301 are classified into independent unit groups; based on the positioning information carrying mode feature (such as the segmented check packaging) analyzed in step 203, the interference signal types are allocated for different unit groups: the pseudo-random fluctuation signal corresponds to the head identification carrying mode, the frequency offset signal corresponds to the segmented embedding mode, and the phase modulation signal corresponds to the hybrid modulation mode.

[0091] In step 303, the non-uniform time interval interference unit active timing is generated according to the spatial dependence of the positioning information modulation feature.

[0092] In this step, the non-uniform time interval active timing refers to the unit triggering rule dynamically adjusted according to the spatial dependence, including short interval dense triggering (building / electromagnetic dense area) and long interval sparse triggering (open area).

[0093] In this embodiment, based on the spatial dependence of the positioning information modulation feature (such as the high-voltage electromagnetic field distortion gradient) analyzed in step 203, differentiated active timing is generated for different spatial unit groups: short interval dense triggering rule is used in electromagnetic dense areas (around power transmission stations), and long interval sparse triggering rule is used in open areas (around power substations).

[0094] In step 304, in the active time window, the interference units in the interference unit group are controlled to emit matching interference signal types according to the interference unit active timing, forming a periodic dynamic interference mode synchronized with the navigation signal transmission period.

[0095] In this embodiment, within the activation time window divided in step 301, each unit group is controlled to emit interference signals according to the timing rules generated in step 303: the first unit group emits frequency offset signals under short interval timing, and the second unit group emits phase modulation signals under long interval timing; a dynamic interference field synchronized with the Beidou signal second-level update period is generated through signal space superposition.

[0096] As another embodiment, according to step 303, the spatial dependence of the positioning information modulation feature is used to generate a non-uniform time interval interference unit activation timing, including:

[0097] In step 401, the spatial dependence feature in the positioning information modulation feature is analyzed, including signal strength attenuation with height feature and modulation distortion feature caused by multipath effect.

[0098] In this step, the spatial dependence feature refers to the influence law of environmental physical field on navigation signal transmission, including signal strength attenuation with height feature (gradient law of signal energy attenuation with increasing height) and modulation distortion feature caused by multipath effect (signal waveform distortion mode caused by environmental factors such as building reflection), which is used to quantify the interference intensity of different spatial positions on navigation signals.

[0099] In this embodiment, based on the positioning information modulation feature analyzed in step 203, the attenuation slope feature of signal strength with height change (reflecting the signal attenuation trend in open space) and the multipath effect modulation distortion feature (quantifying the waveform distortion degree caused by reflection in building-intensive areas) are separated. The height attenuation gradient is extracted by analyzing the signal strength peak distribution, and the multipath effect influence weight is calculated and deduced, forming a set of spatial dependence feature parameters.

[0100] In step 402, according to the signal strength attenuation with height feature, the target UAV activity area is divided into low-altitude area and medium-high altitude area, wherein the low-altitude area is a spatial range with a height of less than or equal to 100 meters, and the medium-high altitude area is a spatial range with a height of more than 100 meters.

[0101] In this step, the low-altitude area refers to a space range with significant signal attenuation and multipath effect (such as a building-intensive area with a height of less than or equal to 100 meters); the medium-high altitude area refers to a space range with stable signal transmission and gentle attenuation (such as an open space with a height of more than 100 meters). The area division is based on the gradient mutation critical point of the signal strength attenuation feature.

[0102] In the embodiment, according to the gradient variation law of signal strength attenuation characteristics with height, the spatial height corresponding to the attenuation slope mutation point is taken as the demarcation criterion: the region with the attenuation slope higher than the critical value is defined as the low-altitude region (signal rapid attenuation area), and the region with the attenuation slope lower than the critical value is defined as the medium-high altitude region (signal gentle attenuation area).

[0103] In step 403, based on the modulation distortion characteristics caused by the multipath effect, a short-interval dense activation timing rule is assigned to the low-altitude region, and a long-interval sparse activation timing rule is assigned to the medium-high altitude region.

[0104] In this step, the short-interval dense activation timing rule refers to a millisecond-level non-uniform triggering sequence designed for the region with significant multipath effect, and the long-interval sparse activation timing rule refers to a hundred-millisecond-level non-uniform triggering sequence designed for the signal stable region.

[0105] In the embodiment, based on the spatial distribution weight of multipath effect modulation distortion characteristics, a short-interval dense timing rule (such as generating an increasing interval sequence according to the Fibonacci sequence) is assigned to the low-altitude region to match the microsecond-level signal fast variation characteristics caused by building reflection, and a long-interval sparse timing rule (such as generating an interval sequence according to the prime number sequence) is assigned to the medium-high altitude region to adapt to the millisecond-level signal stable transmission characteristics of open space.

[0106] In step 404, within the divided activation time window, the short-interval dense activation timing rule and the long-interval sparse activation timing rule are used to generate the activation timing of the interference unit corresponding to the low-altitude region and the medium-high altitude region, respectively.

[0107] In this step, the activation timing of the interference unit is a non-uniform time interval sequence for controlling the emission timing of the electromagnetic shielding array unit, and its generation rule is strictly bound to the spatial region characteristics.

[0108] In the embodiment, within the activation time window divided in step 301, a short-interval dense timing sequence (such as 1-3-5 millisecond cycle) is generated for the low-altitude region unit group, and a long-interval sparse timing sequence (such as 8-13-21 millisecond single triggering) is generated for the medium-high altitude region unit group, so that the interference signal emission rhythm is dynamically matched with the spatial physical field characteristics.

[0109] As another embodiment, according to step 304, within the activation time window, the interference unit group is triggered according to the activation timing of the interference unit to emit a matched interference signal type, forming a periodic dynamic interference mode synchronized with the navigation signal transmission period, which includes:

[0110] In step 501, when the interference signal type assigned to the interference unit group is a pseudo-random fluctuation signal, the interference unit group is triggered according to the non-uniform time interval activation timing within the activation time window to generate a fluctuation signal with randomly jumping amplitude.

[0111] In this step, the amplitude randomly jumping fluctuation signal refers to the interference waveform generated by the non-uniform timing trigger, and the signal amplitude randomly jumps in the preset reference value range, which is used to destroy the amplitude stability of the navigation signal.

[0112] In this embodiment, when the interference unit group is assigned the pseudo-random fluctuation signal type, the unit group is triggered to work in the activation time window generated in step 404 according to the non-uniform time interval (such as short interval dense timing). An electromagnetic wave with a randomly jumping amplitude is generated at each triggering time, and the jumping amplitude dynamically fluctuates in the preset reference range to form an interference waveform for the amplitude stability of the navigation signal.

[0113] Step 502, when the interference signal type assigned to the interference unit group is the frequency offset signal, the interference unit group is triggered according to the non-uniform time interval in the activation time window to generate a modulated signal with a periodically offset carrier frequency.

[0114] In this step, the modulated signal with a periodically offset carrier frequency refers to an interference waveform with a periodically fluctuating carrier frequency around a center frequency point, which realizes interference by destroying the carrier frequency stability of the navigation signal.

[0115] In this embodiment, when the interference unit group is assigned the frequency offset signal type, the unit group is triggered according to the non-uniform timing (such as long interval sparse timing) in the activation time window. An electromagnetic wave with a periodically offset carrier frequency is generated at each triggering, and the offset period is synchronized with the triggering timing to form an interference field for the frequency synchronization mechanism of the navigation signal.

[0116] Step 503, when the interference signal type assigned to the interference unit group is the phase modulation signal, the interference unit group is triggered according to the non-uniform time interval in the activation time window to generate a phase mutation waveform.

[0117] In this step, the phase mutation waveform refers to an interference waveform with a transient jump in the signal phase angle, which realizes interference by destroying the phase continuity of the navigation signal.

[0118] In this embodiment, when the interference unit group is assigned the phase modulation signal type, the unit group is triggered according to the non-uniform timing in the activation time window. An electromagnetic wave with a transient jump in the phase angle is generated at each triggering, and the jump angle is randomly selected in the preset range to form an interference for the phase locking mechanism of the navigation signal.

[0119] Step 504, superimpose the amplitude randomly jumping fluctuation signal, the modulated signal with a periodically offset carrier frequency, and the phase mutation waveform in the three-dimensional space to form a periodic dynamic interference pattern synchronized with the transmission period of the navigation signal.

[0120] In this embodiment, the amplitude jump fluctuation signal generated in the low-altitude area (step 501), the carrier frequency offset modulation signal in the medium-high altitude area (step 502), and the phase jump waveform in the transition space (step 503) are superimposed according to the spatial position coordinates: the amplitude jump signal is dominant in the building-dense area, the carrier frequency offset signal is dominant in the open area, and the phase jump signal is the transition layer in the transition space. Through the time window synchronization mechanism, the superimposed waveform is aligned with the navigation signal period to form a dynamic interference pattern covering the whole space.

[0121] As another embodiment, according to step 103, the periodic dynamic interference pattern is converted into directional spatial interference energy by the spatial gradient barrier distribution of the electromagnetic shielding array, including:

[0122] Step 601, according to the three-dimensional spatial features of the unmanned aerial vehicle activity area, the unit space arrangement structure of the electromagnetic shielding array is configured, wherein the first unit spacing is used in the low-altitude area, the second unit spacing is used in the medium-high altitude area, and the first unit spacing is less than the second unit spacing.

[0123] In this step, the three-dimensional spatial features refer to the topography, building distribution, and electromagnetic environment characteristics of the unmanned aerial vehicle activity area; the unit space arrangement structure is the physical topology of the electromagnetic shielding array, which realizes directional regulation of interference energy through differential unit spacing.

[0124] In this embodiment, according to the three-dimensional spatial features (such as building density and open area distribution) of the target space, the first unit spacing (dense arrangement to enhance signal reflection) is configured for the low-altitude area, and the second unit spacing (sparse arrangement to optimize directional propagation) is configured for the medium-high altitude area. The design that the first unit spacing is less than the second unit spacing forms high-density interference unit clusters in the low-altitude area and low-density directional propagation channels in the medium-high altitude area.

[0125] Step 602, map the periodic dynamic interference pattern to the spatial gradient barrier distribution, wherein the pseudo-random fluctuation signal is mapped to the low-altitude area, and the frequency offset signal is mapped to the medium-high altitude area.

[0126] In this step, the spatial gradient barrier distribution refers to the intensity gradient structure of interference energy in three-dimensional space, which realizes directional energy allocation by binding signal type and spatial area.

[0127] In this embodiment, the periodic dynamic interference pattern generated in step 504 is mapped to the spatial distribution: the pseudo-random fluctuation signal (amplitude jump waveform) is mapped to the low-altitude building-dense area to enhance the interference intensity by building reflection; the frequency offset signal (carrier frequency offset waveform) is mapped to the medium-high altitude open area to realize directional propagation through sparse unit arrangement.

[0128] Step 603, based on the unit space arrangement structure, forming a dense interference intensity distribution in the low-altitude area and a sparse interference intensity distribution in the medium-high altitude area, so that the high interference intensity area and the low interference intensity area arranged alternately in the three-dimensional space form the directional spatial interference energy.

[0129] In this embodiment, based on the unit space arrangement structure: the low-altitude area forms a high-intensity interference field (signal reflection superposition) through dense unit arrangement, and the medium-high altitude area forms a low-intensity interference field (directional radiation) through sparse unit arrangement; through the alternating arrangement of high / low intensity areas in three-dimensional space (such as the junction of building area and open area), a directional energy channel pointing to the receiving antenna of the unmanned aerial vehicle is constructed.

[0130] As another embodiment, according to step 104, the control of the directional spatial interference energy continuously applied to the navigation signal receiving path of the target unmanned aerial vehicle to complete the navigation signal interference of the target unmanned aerial vehicle comprises:

[0131] Step 701, acquiring the signal receiving orientation characteristics of the target unmanned aerial vehicle, the signal receiving orientation characteristics including the pointing angle characteristics of the receiving antenna and the spatial distribution characteristics of the received signal intensity.

[0132] In this step, the signal receiving orientation 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 intensity (the attenuation gradient of signal energy in three-dimensional space), which are used to locate the spatial pointing of the unmanned aerial vehicle navigation signal receiving path.

[0133] In this embodiment, by analyzing the intensity peak distribution of the unmanned aerial vehicle receiving signal, the antenna pointing angle characteristics (such as horizontal and vertical angles) are analyzed; at the same time, the attenuation gradient characteristics of the signal intensity in space (such as intensity concentration in building reflection area and intensity dispersion in open area) are extracted, and the spatial model of the signal receiving path is established.

[0134] Step 702, 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.

[0135] In this step, the matching of the interference unit group refers to the operation of aligning the low-altitude area interference unit group (building dense area unit) and the medium-high altitude area interference unit group (open area unit) in the electromagnetic shielding array with the spatial pointing of the receiving path according to the antenna pointing angle characteristics.

[0136] In this embodiment, based on the pointing angle characteristics (such as the vertical angle ≤30°), the low-altitude area interference unit group (the dense unit around the substation) is activated; based on the vertical angle > 30°, the medium-high altitude area interference unit group (sparse unit 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 pointing.

[0137] Step 703, based on the distribution of high and low intensity regions, dynamically adjust the proportion of directional spatial interference energy projection in the matched interference unit group, and according to the interference signal type of the periodic dynamic interference mode, calibrate the adjusted proportion of directional spatial interference energy projection.

[0138] In this step, the interference energy projection ratio is the intensity distribution coefficient of directional interference energy in space, and the dynamic adjustment and calibration are realized through the high / low interference intensity region distribution and the interference signal type.

[0139] In this embodiment, based on the distribution of high / low interference intensity regions: increase the projection ratio in the building reflection dominant area (high intensity area), and reduce the projection ratio in the open directional propagation area (low intensity area); at the same time, according to the interference signal type of the periodic dynamic interference mode, the projection ratio is calibrated, the pseudo-random fluctuation signal trigger ratio is increased, and the frequency offset signal trigger ratio is reduced.

[0140] Step 704, based on the calibrated directional spatial interference energy projection ratio, through the spatial synergy of the low-altitude region interference unit group and the directional propagation synergy of the medium-high altitude region interference unit group, a continuous interference chain covering the target UAV motion trajectory is generated in three-dimensional space to complete the navigation signal interference of the target UAV.

[0141] In this step, the continuous interference chain is a blind area interference field constructed in three-dimensional space by the spatial synergy of the low-altitude unit group (building reflection wave superposition) and the directional propagation synergy of the medium-high altitude unit group (beam directional focusing).

[0142] In this embodiment, based on the calibrated projection ratio: the low-altitude region unit group forms a building reflection enhanced interference chain through dense unit reflection superposition, and the medium-high altitude region unit group forms a beam focusing interference chain through sparse unit directional radiation; the two types of interference chains seamlessly connect in the spatial transition area, cover the UAV motion trajectory, and continuously block the navigation signal reception path.

[0143] Figure 2 A structural schematic diagram of an unmanned aerial vehicle navigation signal interference system based on an electromagnetic shielding array is provided for the present application, as shown in Figure 2 The system comprises:

[0144] The identification module 21 is used for monitoring the navigation signal emitted by the target UAV in the UAV activity area, and identifying the positioning information transmission characteristics contained in the navigation signal;

[0145] The generation module 22 is used for generating a periodic dynamic interference mode synchronized with the navigation signal transmission period according to the positioning information transmission characteristics;

[0146] A conversion module 23 is configured to convert the periodic dynamic interference pattern into directional spatial interference energy by means of a spatial gradient barrier distribution of the electromagnetic shielding array;

[0147] A control module 24 is configured to control the directional spatial interference energy to be continuously applied to a navigation signal receiving path of the target UAV to complete the navigation signal interference of the target UAV.

[0148] Figure 2 The UAV navigation signal interference system based on the electromagnetic shielding array can perform Figure 1 The UAV navigation signal interference method based on the electromagnetic shielding array of the embodiments described above has the implementation principle and technical effects which will not be repeated. For the specific manner in which each module, unit of the UAV navigation signal interference system based on the electromagnetic shielding array in the above embodiments performs operations has been described in detail in the embodiments related to the method, which will not be described in detail here.

[0149] In one possible design, Figure 2 The UAV navigation signal interference system based on the electromagnetic shielding array of the embodiments described above can be implemented as a computing device, such as Figure 3 As shown, the computing device can include a storage component 31 and a processing component 32.

[0150] 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.

[0151] The processing component 32 is configured to perform the above Figure 1 The UAV navigation signal interference method based on the electromagnetic shielding array of the embodiments described above.

[0152] The processing component 32 can 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 can also be 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, for executing the above method.

[0153] 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 storage 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 storage, flash memory, magnetic disk, or optical disk.

[0154] Of course, computing devices may also include other components, such as input / output interfaces, display components, communication components, etc.

[0155] Input / output interfaces provide interfaces between processing components and peripheral interface modules, which can be output devices, input devices, etc.

[0156] The communication components are configured to facilitate wired or wireless communication between computing devices and other devices.

[0157] The computing device can be a physical device or an elastic computing host provided by a cloud computing platform. In this case, the computing device can refer to a cloud server, and the aforementioned processing components, storage components, etc., can be basic server resources rented or purchased from the cloud computing platform.

[0158] This application also provides a computer storage medium storing a computer program, which, when executed by a computer, can perform the above-described functions. Figure 1 The illustrated embodiment presents a method for interfering with the navigation signals of unmanned aerial vehicles (UAVs) based on an electromagnetic shielding array.

[0159] Those skilled in the art will clearly understand that, for the sake of convenience and brevity, the specific working processes of the systems, devices, and units described above can be referred to the corresponding processes in the foregoing method embodiments, and will not be repeated here.

[0160] The device embodiments described above are merely illustrative. The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the modules can be selected to achieve the purpose of this embodiment according to actual needs. Those skilled in the art can understand and implement this without any creative effort.

[0161] Through the above description of the embodiments, those skilled in the art can clearly understand that each embodiment can be implemented by means of software plus necessary general-purpose hardware platforms, and of course, it can also be implemented by hardware. Based on this understanding, the above technical solutions, in essence or the part 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, magnetic disk, optical disk, etc., and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute the methods described in the various embodiments or some parts of the embodiments.

[0162] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this application.

Claims

1. A method for interfering with UAV navigation signals based on an electromagnetic shielding array, characterized in that, include: Monitor the navigation signals emitted by the target drone in the drone's activity area and identify the positioning information transmission characteristics contained in the navigation signals; Based on the positioning information transmission characteristics, a periodic dynamic interference pattern synchronized with the navigation signal transmission cycle is generated; By utilizing the spatial gradient barrier distribution of the electromagnetic shielding array, the periodic dynamic interference pattern is transformed into directional spatial interference energy. The directional spatial interference energy is continuously applied to the navigation signal receiving path of the target UAV to interfere with the navigation signal of the target UAV. The step of generating a periodic dynamic interference pattern synchronized with the navigation signal transmission period based on the positioning information transmission characteristics includes: Based on the location information update cycle feature in the location information transmission characteristics, the time reference of the interference signal is determined, and the activation time window of multiple interference units in the electromagnetic shielding array is divided. The interference signal includes pseudo-random fluctuation signal, frequency offset signal and phase modulation signal. The multiple interference units are defined as multiple interference unit groups, and the interference signal type of each interference unit group is assigned according to the characteristics of the location information carrying method. Based on the spatial dependence of the modulation features of the positioning information, an activation sequence of interference units with non-uniform time intervals is generated. Within the activation time window, the interference unit group is controlled to emit matching interference signal types according to the activation sequence of the interference units, forming a periodic dynamic interference mode synchronized with the navigation signal transmission cycle.

2. The method according to claim 1, characterized in that, Monitoring navigation signals emitted by a target drone within its operational area and identifying the location information transmission characteristics contained in the navigation signals, including: The system utilizes multiple sensor arrays pre-deployed within the three-dimensional space of the drone's activity area to acquire mixed waveforms of navigation signals emitted by the target drone; The mixed waveform of the navigation signal is decoupled to separate the basic signal features, which include signal fluctuation characteristics, signal coding structure characteristics, and signal intensity distribution characteristics. Based on 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 cycle characteristics, positioning information carrying method characteristics, and positioning information modulation characteristics.

3. The method according to claim 1, characterized in that, Based on the spatial dependence of the modulation features of the positioning information, an activation sequence of interference units with non-uniform time intervals is generated, including: The spatial dependence features in the modulation features of the positioning information are analyzed. The spatial dependence features include the signal strength attenuation with altitude and the modulation distortion features caused by multipath effects. Based on the signal strength attenuation characteristics with altitude, the target UAV's activity area is divided into a low-altitude area and a mid-to-high-altitude area. The low-altitude area is the spatial range with an altitude of less than or equal to 100 meters, and the mid-to-high-altitude area is the spatial range with an altitude of more than 100 meters. Based on the modulation distortion characteristics caused by the multipath effect, short-interval dense activation timing rules are assigned to the low-altitude region, and long-interval sparse activation timing rules are assigned to the mid- and high-altitude regions. Within the defined activation time window, the activation sequence of interference units corresponding to the low-altitude region and the mid-to-high-altitude region is generated according to the short-interval dense activation sequence rule and the long-interval sparse activation sequence rule, respectively.

4. The method according to claim 1, characterized in that, Within the activation time window, the jamming unit group is controlled to emit matching jamming signal types according to the activation sequence of the jamming units, forming a periodic dynamic jamming mode synchronized with the navigation signal transmission period, including: When the type of interference signal assigned by the interference unit group is a pseudo-random fluctuation signal, the interference unit group is activated according to the non-uniform time interval within the activation time window to generate a fluctuation signal with randomly changing amplitude. When the interference signal type assigned by the interference unit group is a frequency offset signal, the interference unit group is activated according to the non-uniform time interval within the activation time window to generate a modulation signal with periodic carrier frequency offset. When the type of interference signal assigned by the interference unit group is a phase modulation signal, the interference unit group is activated according to the non-uniform time interval within the activation time window to generate a phase change waveform. The fluctuating signal with randomly changing amplitude, the modulated signal with periodically shifted carrier frequency, and the waveform with abrupt phase change are superimposed in three-dimensional space to form a periodic dynamic interference mode that is synchronized with the transmission period of the navigation signal.

5. The method according to claim 1, characterized in that, By utilizing the spatial gradient barrier distribution of the electromagnetic shielding array, the periodic dynamic interference pattern is converted into directional spatial interference energy, including: Based on the three-dimensional spatial characteristics of the UAV's activity area, the unit spatial arrangement structure of the electromagnetic shielding array is configured, wherein the low-altitude area adopts the first unit spacing, the mid-to-high-altitude area adopts the second unit spacing, and the first unit spacing is smaller than the second unit spacing. Periodic dynamic disturbance patterns are mapped to spatial gradient barrier distributions, where pseudo-random fluctuation signals are mapped to the low-altitude region and frequency shift signals are mapped to the mid-to-high-altitude region. Based on the unit spatial arrangement structure, a dense interference intensity distribution is formed in the low-altitude region and a sparse interference intensity distribution is formed in the mid-to-high-altitude region, so that the high interference intensity region and the low interference intensity region arranged alternately in the three-dimensional space constitute directional spatial interference energy.

6. The method according to claim 1, characterized in that, Controlling the directional spatial interference energy to continuously apply it to the navigation signal receiving path of the target UAV, in order to achieve navigation signal interference of the target UAV, includes: The signal receiving orientation features of the target UAV are obtained, including the pointing angle features of the receiving antenna and the spatial distribution features of the received signal strength. Based on the pointing angle characteristics, the low-altitude region interference unit group and the mid-to-high-altitude region interference unit group in the spatial gradient barrier distribution of the electromagnetic shielding array are matched. Based on the distribution of high-interference-intensity and low-interference-intensity regions, the directional spatial interference energy projection ratio is dynamically adjusted within the matched 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 mode. Based on the calibrated directional spatial interference energy projection ratio, a continuous interference chain covering the target UAV's trajectory is generated in three-dimensional space through the spatial synergy of the low-altitude interference unit group and the directional propagation synergy of the mid-to-high-altitude interference unit group, thereby completing the interference of the target UAV's navigation signal.

7. A UAV navigation signal jamming system based on an electromagnetic shielding array, applied to the UAV navigation signal jamming method based on an electromagnetic shielding array as described in any one of claims 1-6, characterized in that, Its features include: The identification module is used to monitor navigation signals emitted by the target drone in the drone's activity area and identify the positioning information transmission characteristics contained in the navigation signals; The generation module is used to generate a periodic dynamic interference pattern that is synchronized with the navigation signal transmission cycle based on the positioning information transmission characteristics. The conversion module is used 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 is used to control the continuous application of the directional spatial interference energy to the navigation signal receiving path of the target UAV, so as to complete the navigation signal interference of the target UAV.

8. 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 invoked and executed by the processing component to implement the UAV navigation signal jamming method based on an electromagnetic shielding array as described in any one of claims 1 to 6.

9. A computer storage medium, characterized in that, The device contains a computer program that, when executed by a computer, implements a method for jamming UAV navigation signals based on an electromagnetic shielding array as described in any one of claims 1 to 6.

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