Femtosecond laser plasma shockwave enhanced UAV electromagnetic damage device

Abstract

This invention belongs to the field of laser countermeasures and multi-physics field synergistic damage technology, specifically involving a femtosecond laser plasma shock wave enhanced UAV electromagnetic damage device. The device includes: acquiring the target surface dielectric impedance characteristics and radiation path distribution information to generate an initial excitation parameter set; controlling an ultrafast laser source to output a first ionization pulse and a second excitation pulse with a preset micro-delay interval; projecting the first ionization pulse to induce avalanche ionization and construct a transient plasma layer; injecting the second excitation pulse to drive the plasma adiabatic expansion and release a directional ultra-high pressure shock wave; acquiring the shell micro-deformation field and broadband electromagnetic leakage signal, and performing wavefront phase-matching injection; dynamically reconstructing the pulse time domain and energy ratio based on the synergistic evaluation results until a preset hardware deactivation criterion is met. This invention can solve the problem that single-mode damage is difficult to penetrate composite protective layers.

Description

Technical Field

[0001] This invention belongs to the field of laser countermeasures and multi-physics field synergistic damage technology, specifically relating to a femtosecond laser plasma shock wave enhanced electromagnetic damage device for unmanned aerial vehicles. Background Technology

[0002] With the widespread application of low-altitude, slow-moving, and small unmanned aerial vehicles (UAVs) in modern complex environments, hard-kill countermeasures have become the mainstream defense method. Specifically, existing countermeasure platforms mostly employ high-energy continuous laser ablation systems or high-power microwave jamming equipment. The former achieves structural damage by inducing thermal accumulation through continuous irradiation of the target surface, while the latter relies on broadband radiation to suppress external communication links and navigation modules. Based on this, the aforementioned single-mode methods have been widely integrated into mobile defense arrays, becoming a common technical approach for dealing with conventional targets.

[0003] Problems with existing technology: However, traditional single-mode methods are prone to failure under specific protective conditions when targeting reinforced UAVs with composite armor and electromagnetic shielding cavities. Specifically, when high-energy lasers encounter high-reflectivity and high-heat-capacity protective layers, the thermal ablation energy is rapidly dissipated by the surface, making it difficult to penetrate deep structures. Simultaneously, external electromagnetic radiation is limited by the conduction isolation effect of the shielding structure, preventing effective coupling and injection into the internal core circuit network. The lack of spatiotemporal synergistic excitation from a single physical field significantly reduces the effectiveness of hardware-level paralysis against critical internal nodes, making it difficult to meet the rapid countermeasure requirements under complex conditions. Summary of the Invention

[0004] The purpose of this invention is to provide a femtosecond laser plasma shock wave enhanced electromagnetic damage device for unmanned aerial vehicles, which can solve the problem that single-mode damage is difficult to penetrate composite protective layers.

[0005] The specific technical solution adopted by this invention is as follows: A femtosecond laser plasma shockwave-enhanced electromagnetic damage method for unmanned aerial vehicles (UAVs) achieves non-contact penetration damage against highly shielded targets by constructing a dual-sequence femtosecond pulse timing decoupling and multi-physics field collaborative excitation strategy. The method includes: Obtain the dielectric impedance characteristics and radiation path distribution information of the target surface to generate an initial excitation parameter set; Based on the initial excitation parameter set, the output of the ultrafast laser source is adjusted to have a first ionization pulse and a second excitation pulse with a preset micro-delay interval. The first ionization pulse is directed to the target area to induce avalanche ionization of the surface medium and construct a transient plasma layer. Within the time window during which the transient plasma layer density evolves to a preset phase transition threshold, the second excitation pulse is simultaneously injected to drive the plasma layer to undergo adiabatic expansion and release a directional ultra-high pressure shock wave. The transient micro-deformation field distribution data of the shell induced by the directional ultra-high pressure shock wave are collected in real time, and the broadband electromagnetic leakage signal generated by plasma radiation is captured simultaneously. The broadband electromagnetic leakage signal is injected into the internal circuit node along the target radiation path through wavefront phase matching. Based on the synergistic evaluation results of mechanical stress transmission gradient and electromagnetic injection efficiency, the time-domain delay interval and energy ratio distribution of subsequent pulse sequences are dynamically reconstructed until the preset hardware deactivation criteria are met.

[0006] According to another aspect of the present invention, the step of dynamically reconstructing the time-domain delay interval and energy proportion allocation of the subsequent pulse sequence is as follows: Using plasma expansion rate feedback, the deviation characteristics between the transient reflectivity decay curve and the preset stress transmission model are compared in real time. When the deviation characteristics exceed the tolerance range, the time interval between the first ionization pulse and the second excitation pulse is shortened according to the nonlinear mapping function, and the peak power density of the second excitation pulse is increased, so as to maximize the directional focusing efficiency of the mechanical shock wave in the weak area of ​​the protective structure.

[0007] According to another aspect of the present invention, the step of injecting the broadband electromagnetic leakage signal into the internal circuit node along the target radiation path by means of the wavefront phase matching is as follows: Adaptive electromagnetic spectrum alignment is used to analyze the resonant frequency band characteristics of target slots or parasitic antennas and generate a spectrum filtering mask. During the injection process, the optical polarization state and spatial phase of the second excitation pulse are dynamically modulated so that the main lobe of the radiated broadband electromagnetic leakage signal is aligned with the resonant frequency band characteristics.

[0008] According to another aspect of the present invention, the step of real-time acquisition of the transient micro-deformation field distribution data of the shell induced by the directional ultra-high pressure shock wave includes: Based on coaxial distributed interferometric detection and inverse propagation calculation, a three-dimensional point cloud sequence of transient deformation field on the shell surface is constructed; By reconstructing the refraction and reflection paths of stress waves in multilayer protective media using a spatiotemporal inverse propagation algorithm, and identifying stress concentration characteristics at internal structural nodes, the critical evolution state for microcrack initiation can be determined.

[0009] According to another aspect of the present invention, the step of dynamically reconstructing the time-domain delay interval and energy proportion allocation of subsequent pulse sequences based on the synergistic evaluation results of mechanical stress transmission gradient and electromagnetic injection efficiency includes: Based on the mechanical-electromagnetic joint performance index evaluation, a coupled mapping relationship between microcrack propagation rate and internal circuit logic flip rate is established. When the coupling mapping relationship is characterized as performance decay, it automatically switches to high-frequency pulse superposition mode, and increases the repetition frequency of the second excitation pulse stepwise according to the feedback gradient of the logic flip rate, until the internal circuit network reaches an irreversible logic lock-up state.

[0010] According to another aspect of the present invention, before obtaining the dielectric impedance characteristics and radiation path distribution information of the target surface and generating the initial excitation parameter set, a multi-band environmental scattering inversion and wavefront pre-compensation architecture is adopted to obtain the turbulence intensity and attenuation coefficient distribution of the current transmission medium. Based on the attenuation coefficient, a phase pre-distortion is applied to the initial wavefront of the first ionization pulse and the second excitation pulse, and a self-focusing nonlinear modulation is introduced on the beam transmission path to compensate for the energy flux density attenuation caused by long-distance transmission, ensuring that the ionization threshold of the target surface is stably and with low thermal loss.

[0011] According to another aspect of the present invention, the step of dynamically reconstructing the time-domain delay interval and energy proportion allocation of the subsequent pulse sequence until a preset hardware deactivation criterion is met includes: Multimodal state monitoring and safety fuse are employed to simultaneously monitor the step shift characteristics of the reflectance spectrum of the target area and the attenuation slope of the acoustic vibration signal. When the step drift characteristic reaches a preset fracture threshold and the acoustic signal exhibits exponential attenuation, it is determined that the internal structure has undergone penetrating damage. When the accompanying electromagnetic radiation noise drops to the background noise level, it is determined that the internal circuit network has lost its electromagnetic response capability. When the dual-state synchronization is achieved, the laser pulse sequence is immediately cut off and the optical path thermal balance protection mechanism is triggered.

[0012] According to another aspect of the present invention, a femtosecond laser plasma shock wave enhanced electromagnetic damage device for unmanned aerial vehicles is also provided, comprising: The ultrafast pulse timing control cavity is equipped with a beam-splitting interferometer and a dynamic optical delay line, which is used to decouple the input single-beam femtosecond laser from the main excitation beam and the secondary ionization beam, and to adjust the energy level ratio and micro-delay window of the two beams in real time. The adaptive wavefront emission component, with its optical path connected to the output end of the ultrafast pulse timing control cavity, integrates a phase conjugate compensation lens group and a micro-displacement reflection array to eliminate atmospheric transmission distortion and dynamically lock the target irradiation area. A multimodal damage feedback array is arranged around the light-emitting aperture of the adaptive wavefront emitting component. It includes a broadband spectral analysis unit, a high-frequency acoustic sensing array, and a near-field electromagnetic probe for synchronously acquiring plasma expansion spectra, transient vibration spectra of the shell, and radiated electromagnetic field intensity. The central collaborative control core establishes high-frequency data bus connections with the ultrafast pulse timing control cavity, the adaptive wavefront emission component, and the multimodal damage feedback array, respectively. It integrates a timing-energy joint solver and a multiphysics mapping engine to reconstruct the displacement parameters of the dynamic optical delay line and the driving matrix of the phase conjugate compensation lens group based on real-time telemetry data, so as to realize the spatiotemporal superposition and focusing of plasma shock waves and broadband electromagnetic pulses inside the target.

[0013] According to another aspect of the present invention, the dynamic optical delay line adopts a closed-loop control structure composed of a multi-stage reflection prism group and a piezoelectric micro-feeding mechanism. The central collaborative control core outputs a high-frequency compensation voltage to the piezoelectric micro-feeding mechanism to realize continuous stepless adjustment of the time domain interval between the first ionization pulse and the second excitation pulse.

[0014] According to another aspect of the present invention, the multiphysics mapping engine is configured with parallel processing data decoupling channels, the first channel performs spatiotemporal inverse calculation of the micro-deformation field distribution of the shell to output the stress pressure gradient field, and the second channel performs spectral feature extraction of the radiation electromagnetic field intensity to output the target equivalent coupling impedance spectrum. The multiphysics mapping engine performs tensor fusion calculations on the stress pressure gradient field and the equivalent coupling impedance spectrum to generate a damage performance heatmap, and outputs trajectory tracking commands for the micro-displacement reflection array based on the peak offset trajectory of the heatmap.

[0015] According to another aspect of the present invention, an electronic device is also provided, the electronic device including a memory and a processor; the memory is used to store a program; the processor executes the program to implement the method described in any one of the foregoing.

[0016] According to another aspect of the present invention, a computer-readable storage medium is also provided, the storage medium storing a computer program that, when executed by a processor, implements the method described in any one of the preceding embodiments.

[0017] According to another aspect of the present invention, a computer program product is also provided, including a computer program that, when executed by a processor, implements the method described in any one of the preceding embodiments.

[0018] The technical effects achieved by this invention are as follows: This invention achieves precise secondary excitation of the plasma layer within the optimal density phase transition window by employing dual-sequence femtosecond pulse timing decoupling and micro-delay injection. This allows the secondary pulse energy to be efficiently absorbed by the high-density electron gas and instantly converted into directional adiabatic expansion kinetic energy. Without significantly increasing the total irradiation energy, this invention significantly improves the stress transmission efficiency of the deep structure, avoids the optical shielding effect caused by premature melting of the surface material, and provides a reliable mechanical carrier for subsequent hardware-level damage.

[0019] This invention, by constructing a collaborative evaluation framework for mechanical stress transmission gradient and electromagnetic injection effectiveness, can solve the problem of damage effectiveness attenuation caused by a single physical field, thereby realizing the spatiotemporal superposition of physical shock wave damage and broadband electromagnetic pulse coupling injection. By utilizing the structural weak point data inverted from the micro-deformation field distribution of the shell, the wavefront phase and spectral main lobe distribution of the radiation signal are modulated in real time, enabling electromagnetic energy to accurately penetrate into the shielded cavity through the parasitic mode of the gap, bypassing the protection of the external high-conductivity isolation layer. The multi-physics field collaborative mechanism not only improves the probability of non-contact paralysis of internal core circuit nodes, but also achieves closed-loop optimization of dynamic target damage parameters.

[0020] This invention solves the problems of beam divergence and energy flux density attenuation caused by long-distance atmospheric transmission by deploying plasma expansion rate feedback and adaptive wavefront pre-compensation modules, thereby achieving stable focusing and low thermal loss breakthrough of laser pulses in complex turbulent environments. Based on the real-time inverted spectral scattering and turbulence distribution characteristics, an inverse phase distortion is applied to the initial wavefront, and combined with self-focusing nonlinear modulation guided by the Kerr effect, energy loss and spatial phase distortion during optical path transmission can be suppressed. While ensuring that the ionization pulse and excitation pulse can maintain femtosecond-level temporal synchronization accuracy in the far field, it can also ensure the reliability of the damage action distance and the environmental adaptability of the system operation.

[0021] This invention, through multimodal state monitoring and safety fuse, can avoid heat accumulation and ineffective energy consumption of optical components caused by excessive impact, thereby achieving precise termination of the damage process and long-term thermal balance of the device. It simultaneously tracks the target's reflectance spectrum step drift and acoustic vibration attenuation slope, and triggers a pulse cutoff command only when both mechanical penetration damage and internal electromagnetic silence thresholds are met. This not only avoids redundant consumption of energy resources, but also protects the internal precision optical delay line and phase modulator from backscattering thermal damage by instantly cutting off the high-power optical path output, significantly extending the continuous combat life of the equipment. Attached Figure Description

[0022] Figure 1 This invention provides a method for damaging unmanned aerial vehicles using femtosecond laser plasma shockwave enhancement. Figure 1 ; Figure 2This invention provides a method for damaging unmanned aerial vehicles using femtosecond laser plasma shockwave enhancement. Figure 2 ; Figure 3 This is a structural block diagram of the femtosecond laser plasma shock wave enhanced electromagnetic destruction device of the present invention. Detailed Implementation

[0023] To make the objectives and advantages of this invention clearer, the invention will be specifically described below with reference to embodiments. It should be understood that the following text is merely used to describe one or more specific embodiments of the invention and does not strictly limit the scope of protection specifically claimed by the invention.

[0024] It should be noted that the terms "first," "second," etc., used in this invention are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of the invention described herein can be implemented in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0025] According to embodiments of the present invention, a method embodiment of a femtosecond laser plasma shock wave enhanced electromagnetic damage method for unmanned aerial vehicles is provided. It should be noted that the steps shown in the flowchart in the accompanying drawings can be executed in a computer system such as a set of computer-executable instructions. Furthermore, although a logical order is shown in the flowchart, in some cases, the steps shown or described may be executed in a different order than that shown here.

[0026] like Figure 1 and Figure 2 As shown, the femtosecond laser plasma shock wave enhanced electromagnetic damage method for UAVs achieves non-contact penetration damage against highly shielded targets by constructing a dual-sequence femtosecond pulse timing decoupling and multi-physics field collaborative excitation strategy. The method includes the following steps: It should be noted that the following steps can be implemented through the following steps, but the following embodiments are only used to explain the present invention and do not constitute a limitation on the present invention. Femtosecond laser plasma shock wave enhanced UAV electromagnetic damage system, hereinafter referred to as the system; In step S1, the dielectric impedance characteristics and radiation path distribution information of the target surface are acquired to generate an initial excitation parameter set. The system can rapidly scan the dielectric constant, thermal conductivity, and structural gap distribution of the target shell through a pre-amplified broadband detection module, thereby identifying weak paths where electromagnetic waves and mechanical stress are easily coupled. This step abstracts complex physical properties into an initial excitation parameter set, providing a priori reference for subsequent pulse energy allocation and avoiding energy dissipation caused by indiscriminate irradiation.

[0027] In step S2, based on the initial excitation parameter set, the ultrafast laser source outputs a first ionization pulse and a second excitation pulse with a preset micro-delay interval. On this basis, the programmable timing controller inside the femtosecond laser calculates the optimal delay window according to the parameter set, splits the single laser beam and independently modulates the energy envelope and pulse width to form a cascaded double pulse sequence. By decoupling the ionization and excitation processes in the time domain, it can ensure that the plasma is excited a second time under the optimal density state, thereby improving the energy conversion efficiency.

[0028] In step S3, the first ionization pulse is directed onto the target area, inducing avalanche ionization of the surface medium and constructing a transient plasma layer. Specifically, the first pulse arrives at the target surface with a low energy density, causing multiphoton absorption in the surface material and rapidly releasing free electrons. This process can form a high-concentration free electron gas within micro-nanoseconds, providing the physical medium for the subsequent generation of shock waves, while effectively avoiding surface reflection losses caused by direct thermal melting of traditional long-pulse lasers.

[0029] In step S4, within the time window during which the transient plasma layer density evolves to a preset phase transition threshold, a second excitation pulse is simultaneously injected, driving the plasma layer to undergo adiabatic expansion and release a directional ultra-high pressure shock wave. The arrival timing of the second excitation pulse is highly matched with the plasma critical density point. At this time, free electrons absorb a large amount of secondary photon energy and rapidly heat up, causing the plasma volume to undergo adiabatic expansion in a very short time. The resulting mechanical recoil force is radially transmitted into the target interior in the form of an ultra-high pressure shock wave. Its peak pressure is sufficient to induce stress concentration below the surface of the protective layer, achieving deep penetration at the physical level.

[0030] In step S5, the transient micro-deformation field distribution data of the shell caused by the directional ultra-high pressure shock wave is collected in real time, and the broadband electromagnetic leakage signal generated by plasma radiation is captured simultaneously. The broadband electromagnetic leakage signal is injected into the internal circuit node along the target radiation path through wavefront phase matching.

[0031] Furthermore, the system utilizes the transient electromagnetic radiation generated at the moment of plasma rupture as a natural interference source, combined with the opening and closing of gaps caused by the micro-deformation of the shell under the action of the shock wave, to dynamically adjust the phase distribution of the electromagnetic waves. Through wavefront phase matching, the radiated signal can be precisely coupled into the parasitic modes of the internal antenna or cable, achieving a "hitting a cow through a mountain" electromagnetic injection effect, thereby bypassing the isolation effect of the external shielding layer.

[0032] In step S6, based on the synergistic evaluation results of mechanical stress transmission gradient and electromagnetic injection efficiency, the time-domain delay interval and energy ratio distribution of subsequent pulse sequences are dynamically reconstructed until the preset hardware deactivation criteria are met.

[0033] Preferably, the control core inputs the real-time feedback deformation data and electromagnetic coupling strength into the joint solution model to calculate the marginal reduction point of the current damage effectiveness. When the system determines that the internal circuit logic flip rate has reached a critical value or the stress crack has extended to the core component, it automatically terminates the sequence output and switches to a safe standby state. Through the above control mechanism, this embodiment achieves spatiotemporal coordination of mechanical penetration and electromagnetic injection, effectively breaking through the protection barrier of a single method.

[0034] As an optional embodiment, the step of dynamically reconstructing the time-domain delay interval and energy ratio allocation of the subsequent pulse sequence adopts a plasma expansion rate feedback architecture to compare the deviation characteristics of the transient reflectivity decay curve and the preset stress transmission model in real time. When the deviation characteristics exceed the tolerance range, the time interval between the first ionization pulse and the second excitation pulse is shortened according to the nonlinear mapping function, and the peak power density of the second excitation pulse is increased, so as to maximize the directional focusing efficiency of the mechanical shock wave in the weak area of ​​the protective structure.

[0035] Furthermore, during the dynamic reconfiguration process in step S6, the system introduces a plasma expansion rate feedback architecture to achieve adaptive optimization of parameters.

[0036] Specifically, by monitoring the transient decay curve of the target surface reflectivity, the actual expansion velocity of the plasma cloud can be deduced and compared in real time with a preset ideal stress transmission model. When the monitored deviation exceeds the preset tolerance range, indicating that the current delay matching has failed to achieve optimal interference superposition of the shock wave within the protective layer, the control algorithm will trigger a nonlinear mapping function, automatically shortening the time interval of the dual pulses and correspondingly increasing the peak power density of the second excitation pulse. Since shortening the time interval allows the secondary pulse to intervene earlier in the middle of plasma evolution, when the medium is still in a high-density excited state, the increased peak power can be directly converted into stronger radial expansion kinetic energy. Thus, the wavefront of the shock wave can achieve directional focusing in the microscopic weak areas of the protective structure, effectively amplifying the local stress concentration effect and ensuring efficient transmission of damage energy to the deep structure.

[0037] As an optional embodiment, the step of injecting the broadband electromagnetic leakage signal into the internal circuit node along the target radiation path through wavefront phase matching adopts an adaptive electromagnetic spectrum alignment architecture to analyze the resonant frequency band characteristics of the target slot or parasitic antenna and generate a spectrum filtering mask. During the injection process, the optical polarization state and spatial phase of the second excitation pulse are dynamically modulated to align the main lobe of the radiated broadband electromagnetic leakage signal with the resonant frequency band characteristics, thereby improving the non-radiative coupling injection efficiency of electromagnetic energy into the internal circuit nodes.

[0038] In another optional embodiment, for the electromagnetic signal injection stage, the system adopts an adaptive electromagnetic spectrum alignment architecture for precise guidance. The front probe array first performs high-frequency impedance scanning on the seams, heat dissipation holes or cable interfaces of the target shell to resolve the resonant frequency band characteristics of its equivalent parasitic antenna, and generates a corresponding spectrum filtering mask accordingly. The beam control unit dynamically modulates the optical polarization state and spatial phase distribution of the second excitation pulse so that the broadband electromagnetic leakage signal generated by plasma radiation has a specific spectrum shape from the beginning.

[0039] Furthermore, by actively adjusting the polarization rotation angle and wavefront curvature, the peak energy of the main lobe of the radiated signal can be precisely aligned with the resonant frequency band of the target, thereby exciting a strong near-field electromagnetic resonance effect. Non-radiative coupling injection avoids the energy diffusion of electromagnetic waves in open space, allowing a large amount of radiated energy to "penetrate" into the shielded cavity through structural gaps, significantly improving the electromagnetic disturbance intensity and injection efficiency of the internal sensitive circuit nodes.

[0040] As an optional embodiment, the step of real-time acquisition of the distribution data of the transient micro-deformation field of the shell induced by the directional ultra-high pressure shock wave adopts a coaxial distributed interferometric detection and inverse propagation calculation architecture to construct a three-dimensional point cloud sequence of the transient deformation field on the shell surface; By reconstructing the refraction and reflection paths of stress waves in multilayer protective media using a spatiotemporal inverse propagation algorithm, and identifying stress concentration characteristics at internal structural nodes, the critical evolution state of microcrack initiation can be accurately determined.

[0041] Furthermore, for the acquisition and analysis of transient micro-deformation field distribution data of the shell, a coaxial distributed interferometric detection and inverse propagation algorithm architecture is adopted. In this architecture, multiple ultra-high-speed interferometers are deployed along the coaxial direction of the beam transmission in the detection module, continuously capturing the optical path difference changes on the target surface within a microsecond-level time window, thereby rapidly reconstructing a high-density three-dimensional point cloud sequence. Based on this, the built-in spatiotemporal inverse propagation algorithm uses the observed surface displacement data as boundary conditions to inversely deduce the propagation trajectory of stress waves in composite materials or multi-layered skins. By simulating the superposition effect of refraction and reflection of stress waves at heterogeneous interfaces, the system can accurately inversely reproduce the stress concentration distribution map at structural nodes such as internal reinforcing ribs and circuit board fixing points.

[0042] Furthermore, inverse calculation can identify the critical evolution state of microcrack initiation in advance. When the local strain rate exceeds the material fatigue threshold, it can trigger an early warning or parameter adjustment, providing high-precision spatial coordinates and mechanical basis for the targeted strike of subsequent pulse sequences.

[0043] As an optional embodiment, the step of dynamically reconstructing the time-domain delay interval and energy proportion allocation of subsequent pulse sequences based on the synergistic evaluation results of mechanical stress transmission gradient and electromagnetic injection efficiency includes: Based on the mechanical-electromagnetic joint performance index evaluation framework, a coupled mapping relationship between microcrack propagation rate and internal circuit logic flip rate is established. When the coupling mapping relationship is characterized as performance decay, it automatically switches to high-frequency pulse superposition mode and increases the repetition frequency of the second excitation pulse stepwise according to the feedback gradient of the logic flip rate until the internal circuit network reaches an irreversible logic lock-up state.

[0044] In one optional embodiment, the collaborative evaluation stage relies on a mechanical-electromagnetic joint performance index evaluation architecture to achieve deep coupling analysis. The control core places the real-time acquired microcrack propagation rate data and the bypass-detected internal circuit logic flip-flop rate data in the same evaluation coordinate system, establishing a dynamic coupling mapping relationship between the two as a function of the number of pulse irradiations. When the system detects that this coupling relationship shows a trend of performance decay, indicating that a single mechanical impact or electromagnetic injection has approached the tolerance limit of the current protective structure, it automatically switches to a high-frequency pulse superposition mode. In this mode, the system increases the repetition frequency of the second excitation pulse in a stepwise manner according to the feedback gradient of the logic flip-flop rate. The continuous bombardment of high-frequency pulses can produce a fatigue accumulation effect at the tip of the microcrack, while the dense electromagnetic pulse interference will prevent the internal logic gate circuits from completing state recovery within a clock cycle. Thus, the dual superposition of mechanical fatigue and electromagnetic disturbance forces the internal circuit network to quickly cross the functional critical point, reaching an irreversible logic lock-up state, thereby completely terminating the target's processing and control capabilities.

[0045] As an optional embodiment, before obtaining the dielectric impedance characteristics and radiation path distribution information of the target surface and generating the initial excitation parameter set, a multi-band environmental scattering inversion and wavefront pre-compensation architecture is used to obtain the turbulence intensity and attenuation coefficient distribution of the current transmission medium. Phase pre-distortion is applied to the initial wavefronts of the first ionization pulse and the second excitation pulse based on the attenuation coefficient, and self-focusing nonlinear modulation is introduced on the beam transmission path to compensate for the energy flux density attenuation caused by long-distance transmission, ensuring that the ionization threshold of the target surface is stably and thermally broken through.

[0046] Furthermore, to ensure beam quality under long-distance action, the system performs a multi-band environmental scattering inversion and wavefront pre-compensation process before generating the initial excitation parameter set. In this process, by transmitting a low-power probe beacon and receiving its backscattered spectrum, the system can invert the turbulence intensity distribution and spectral attenuation coefficient in the atmospheric transmission channel in real time.

[0047] Based on the attenuation coefficient distribution matrix, the wavefront modulator applies reverse phase distortion to the initial phases of the first ionization pulse and the second excitation pulse to pre-compensate atmospheric disturbances during transmission. Simultaneously, the beam control system actively introduces self-focusing nonlinear modulation along the transmission path, utilizing the Kerr effect of the medium to form a controllable beam convergence point in front of the target region. This combination of pre-compensation and self-focusing effectively suppresses the energy flux density decrease caused by beam divergence, ensuring that the laser pulse reaching the target surface maintains extremely high peak intensity. Therefore, even under complex weather conditions, the system can stably and with low thermal loss trigger the multiphoton ionization process of the target medium, ensuring the reliability of the damage mechanism activation.

[0048] As an optional embodiment, the step of dynamically reconstructing the time-domain delay interval and energy proportion allocation of subsequent pulse sequences until a preset hardware deactivation criterion is met includes: A multimodal state monitoring and safety fuse architecture is adopted to simultaneously monitor the step shift characteristics of the reflectance spectrum of the target area and the attenuation slope of the acoustic vibration signal. Optionally, when the step drift characteristics reach a preset fracture threshold and the acoustic signal exhibits exponential attenuation, it is determined that the internal structure has undergone penetrating damage. When the accompanying electromagnetic radiation noise drops to the background noise level, it is determined that the internal circuit network has lost its electromagnetic response capability. When the dual-state synchronization is achieved, the laser pulse sequence is immediately cut off and the optical path thermal balance protection mechanism is triggered.

[0049] Furthermore, in the final stage of damage assessment, the system deploys a multimodal condition monitoring and safety fuse architecture to prevent excessive impact and system damage. A high-resolution spectrometer and a broadband acoustic sensor work synchronously to track the step drift characteristics of the target area's reflectance spectrum and the attenuation slope of the shell's acoustic vibration signal in real time.

[0050] Furthermore, when the spectral characteristics undergo a sudden change that reaches the preset material fracture threshold, and the acoustic vibration slope exhibits a typical exponential decay pattern, the algorithm determines that the protective structure has lost its load-bearing capacity and that internal through-damage has occurred. At the same time, the system continuously monitors the electromagnetic noise spectral density radiated by the target. Once the noise intensity drops back to the ambient background noise level, it indicates that the internal circuit has completely failed and lost its electromagnetic response capability.

[0051] Preferably, the control core determines that the hardware inactivation criterion is met only when both mechanical damage and electromagnetic silence are simultaneously achieved, and then issues a command to instantly cut off the laser pulse output. The safety fuse mechanism not only avoids the continuous consumption of ineffective energy, but also quickly triggers the thermal balance cooling cycle inside the optical path, ensuring the safe and long-term stable operation of the core optical components of the device.

[0052] As an optional embodiment, refer to Figure 3 As shown, a femtosecond laser plasma shock wave enhanced electromagnetic destruction device is also provided, comprising: The ultrafast pulse timing control cavity is equipped with a beam-splitting interferometer and a dynamic optical delay line, which is used to decouple the input single-beam femtosecond laser from the main excitation beam and the secondary ionization beam, and to adjust the energy level ratio and micro-delay window of the two beams in real time. The adaptive wavefront emission component, with its optical path connected to the output end of the ultrafast pulse timing control cavity, integrates a phase conjugate compensation lens group and a micro-displacement reflection array to eliminate atmospheric transmission distortion and dynamically lock the target illumination area. A multimodal damage feedback array, arranged around the light-emitting aperture of the adaptive wavefront emission component, includes a broadband spectral analysis unit, a high-frequency acoustic sensing array, and a near-field electromagnetic probe, used to synchronously acquire plasma expansion spectra, transient vibration spectra of the shell, and radiated electromagnetic field intensity. The central collaborative control core establishes high-frequency data bus connections with the ultrafast pulse timing control cavity, the adaptive wavefront emission component, and the multimodal damage feedback array. It integrates a timing-energy joint solver and a multiphysics mapping engine to reconstruct the displacement parameters of the dynamic optical delay line and the driving matrix of the phase conjugate compensation lens group based on real-time telemetry data, so as to realize the spatiotemporal superposition and focusing of plasma shock waves and broadband electromagnetic pulses inside the target.

[0053] Based on the above, corresponding to the aforementioned method embodiments, the present invention also provides a hardware implementation architecture for a femtosecond laser plasma shock wave enhanced electromagnetic damage device, wherein an ultrafast pulse timing control cavity serves as the energy distribution center of the system, and beam-splitting interference arms and dynamic optical delay lines are precisely arranged inside.

[0054] When a high-energy femtosecond laser source is input, the beam splitter divides it according to a preset ratio, and the dynamic optical delay line is precisely set to the micro-delay window for the two beams to reach the target through mechanical or optical path difference adjustment.

[0055] The optical output is directly connected to the adaptive wavefront emission component, which integrates a phase conjugate compensation lens group and a micro-displacement reflection array. The lens group corrects the beam wavefront in real time based on atmospheric turbulence feedback, while the reflection array is used to quickly adjust the optical axis direction to dynamically lock onto the moving target.

[0056] In terms of structural layout, the multimodal damage feedback array surrounds the light-emitting aperture of the adaptive wavefront emitting component, forming a ring-shaped monitoring network. The broadband spectral analysis unit, high-frequency acoustic sensing array, and near-field electromagnetic probe contained therein can simultaneously capture the plasma radiation spectrum, structural vibration spectrum, and leakage electromagnetic field data of the action area.

[0057] All sensor signals are aggregated to the central collaborative control core via a high-frequency data bus. The time-energy joint solver and multiphysics mapping engine embedded in the central collaborative control core process the telemetry data in real time, dynamically reconstructing the displacement parameters of the delay line and the driving matrix of the compensation lens group. As a result, the device can achieve a hardware-level closed loop of optical control and multimodal feedback, ensuring that the plasma shock wave and electromagnetic pulse achieve precise spatiotemporal superposition and focusing inside the target.

[0058] As an optional embodiment, the dynamic optical delay line adopts a closed-loop control structure consisting of a multi-stage reflection prism group and a piezoelectric micro-feeding mechanism. The central collaborative control core outputs a high-frequency compensation voltage to the piezoelectric micro-feeding mechanism to achieve continuous stepless adjustment of the time interval between the first ionization pulse and the second excitation pulse. Its adjustment step accuracy can reach the femtosecond level of phase alignment requirements to ensure accurate capture of the plasma phase transition window.

[0059] Furthermore, the mechanical and optical coupling structure of the dynamic optical delay line adopts a closed-loop control architecture consisting of a multi-stage reflection prism group and a piezoelectric micro-feeding mechanism. The multi-stage reflection prism group is arranged in series in the optical path of the secondary ionization beam, and its base is rigidly connected to the displacement platform of the high-precision piezoelectric micro-feeding mechanism.

[0060] During operation, the central collaborative control core outputs a high-frequency fine-tuning compensation voltage to the electrode array of the piezoelectric micro-feeding mechanism based on the real-time calculation delay requirements. Under the influence of the electric field, the piezoelectric ceramic material undergoes nanoscale stretching and deformation, driving the reflecting prism assembly to move smoothly along the optical axis, thereby changing the optical path length of the secondary beam. The system can achieve continuous stepless adjustment of the temporal interval between the two laser beams, with the adjustment step accuracy strictly meeting the femtosecond-level phase alignment requirements. Optical path difference control ensures that the secondary pulse can enter the phase transition window of transient plasma density evolution, providing reliable hardware support for the stable generation of high-pressure shock waves.

[0061] As an optional embodiment, the multiphysics mapping engine is configured with parallel processing data decoupling channels. The first channel performs spatiotemporal inverse calculation of the micro-deformation field distribution of the shell to output the stress-pressure gradient field, and the second channel performs spectral feature extraction of the radiation electromagnetic field intensity to output the target equivalent coupling impedance spectrum. The multiphysics mapping engine performs tensor fusion calculation on the stress-pressure gradient field and the equivalent coupling impedance spectrum to generate a damage performance heatmap, and outputs trajectory tracking instructions for the micro-displacement reflection array based on the peak offset trajectory of the heatmap, thereby enabling adaptive correction of the beam projection point to maintain the continuity of multiphysics damage performance.

[0062] In a preferred embodiment, the multiphysics mapping engine built into the central collaborative control core adopts a heterogeneous parallel architecture and is configured with a first channel and a second channel for independent computation.

[0063] The first channel receives raw time-series data from the high-frequency acoustic sensor array and interferometric detection unit, executes the spatiotemporal inverse calculation algorithm for the micro-deformation field distribution of the shell, and outputs the dynamically changing stress and pressure gradient field in real time; the second channel processes the signals collected by the near-field electromagnetic probe in parallel, performs fast Fourier transform and spectral feature extraction, and outputs the target equivalent coupling impedance spectrum characterizing the shielding effectiveness of the target.

[0064] The multiphysics mapping engine further utilizes a tensor fusion algorithm to perform multidimensional superposition calculations on the mechanical stress field distribution matrix and electromagnetic impedance spectrum data in a unified coordinate system, generating a damage performance heatmap that intuitively represents the current damage intensity. When the peak value of the high-efficiency region in the heatmap experiences spatial shift, the multiphysics mapping engine automatically extracts the shift trajectory and converts it into a spatial coordinate compensation quantity, which is directly sent to the micro-displacement reflection array of the adaptive wavefront emission component. Data-driven beam guidance can track the optimal damage point of the target structure in real time, adaptively correcting the projection landing point to avoid damaged or inefficient areas, thereby maintaining a high level of multiphysics damage performance throughout the entire action cycle.

[0065] It should be noted that the above modules can be implemented by software or hardware. For the latter, they can be implemented in the following ways, but are not limited to: all the above modules are located in the same processor; or, the above modules are located in different processors in any combination.

[0066] According to another aspect of the present invention, an electronic device is also provided, the electronic device including a memory and a processor; the memory is used to store a program; the processor executes the program to implement the method of any of the foregoing.

[0067] According to the aforementioned electronic device, the control logic of the femtosecond laser plasma shockwave-enhanced UAV damage method can be deployed in a separate electronic device. This electronic device contains non-volatile memory and a high-speed multi-core processor. The memory contains a set of control instructions for performing pulse timing modulation, multi-modal data fusion, and wavefront phase compensation. After power-on, the processor loads the program and interacts with the device's optical modulator and sensor array via a real-time bus. With the aid of a dedicated instruction set or hardware acceleration unit, the processor can efficiently complete the nonlinear mapping solution, tensor fusion calculation, and closed-loop feedback control involved in the aforementioned claims, enabling general-purpose computing hardware to execute complex multiphysics damage control strategies and improving the system's compatibility and deployment flexibility across different hardware platforms.

[0068] According to another aspect of the present invention, a computer-readable storage medium is also provided, the storage medium storing a computer program that, when executed by a processor, implements the method of any of the foregoing.

[0069] Furthermore, according to the aforementioned computer-readable storage medium, the computer-readable storage medium can be any physical carrier capable of carrying program code, such as flash memory, solid-state drive, optical disk, or hard disk. The computer program stored within the medium is configured to include the complete algorithm flow and parameter threshold definitions of the aforementioned damage method. When the storage medium is connected to the central control unit of the device or an external maintenance terminal, the processor reads and executes the program, thereby instantiating standard computer hardware into a control core with dual-pulse timing decoupling and multimodal feedback closed-loop functions. This media-based deployment method facilitates offline backup, version iteration, and cross-device portability of the system control algorithm, and can significantly shorten the system's software upgrade and functional expansion cycle without changing the underlying optical and mechanical hardware architecture.

[0070] According to another aspect of the present invention, a computer program product is also provided, including a computer program that, when executed by a processor, implements the method described in any of the foregoing.

[0071] Furthermore, this invention also protects a product containing a computer program, which can be obtained through network download, physical carrier distribution, or pre-installed in a secure chip. When running, this computer program provides the processor with a complete damage task scheduling framework, automatically initializes the initial states of each optical component, and continuously monitors the data health of the mechanical and electromagnetic feedback channels during execution. Through modular encapsulation of control logic, the program not only achieves comprehensive coverage of the aforementioned method claims but also reduces the integration difficulty with heterogeneous sensor arrays through standardized interface protocols, providing underlying software architecture support for the evolution of the device into an intelligent, networked collaborative combat platform.

[0072] The above description is merely a preferred embodiment of the present invention. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principles of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention. Structures, devices, and operating methods not specifically described or explained in this invention are implemented according to conventional methods in the art unless otherwise specified or limited.

Claims

1. A femtosecond laser plasma shock wave enhanced electromagnetic damage method for unmanned aerial vehicles, characterized in that, By constructing a dual-sequence femtosecond pulse timing decoupling and multi-physics field collaborative excitation strategy, non-contact penetration damage is achieved against highly shielded targets. The method includes: Obtain the dielectric impedance characteristics and radiation path distribution information of the target surface to generate an initial excitation parameter set; Based on the initial excitation parameter set, the output of the ultrafast laser source is adjusted to have a first ionization pulse and a second excitation pulse with a preset micro-delay interval. The first ionization pulse is directed to the target area to induce avalanche ionization of the surface medium and construct a transient plasma layer. Within the time window during which the transient plasma layer density evolves to a preset phase transition threshold, the second excitation pulse is simultaneously injected to drive the plasma layer to undergo adiabatic expansion and release a directional ultra-high pressure shock wave. The transient micro-deformation field distribution data of the shell induced by the directional ultra-high pressure shock wave are collected in real time, and the broadband electromagnetic leakage signal generated by plasma radiation is captured simultaneously. The broadband electromagnetic leakage signal is injected into the internal circuit node along the target radiation path through wavefront phase matching. Based on the synergistic evaluation results of mechanical stress transmission gradient and electromagnetic injection efficiency, the time-domain delay interval and energy ratio distribution of subsequent pulse sequences are dynamically reconstructed until the preset hardware deactivation criteria are met.

2. The femtosecond laser plasma shock wave enhanced electromagnetic damage method for unmanned aerial vehicles according to claim 1, characterized in that, The steps for dynamically reconstructing the time-domain delay interval and energy proportion allocation of the subsequent pulse sequence are as follows: Using plasma expansion rate feedback, the deviation characteristics between the transient reflectivity decay curve and the preset stress transmission model are compared in real time. When the deviation characteristics exceed the tolerance range, the time interval between the first ionization pulse and the second excitation pulse is shortened according to the nonlinear mapping function, and the peak power density of the second excitation pulse is increased, so as to maximize the directional focusing efficiency of the mechanical shock wave in the weak area of ​​the protective structure.

3. The femtosecond laser plasma shock wave enhanced electromagnetic damage method for unmanned aerial vehicles according to claim 1, characterized in that, The step of injecting the broadband electromagnetic leakage signal into the internal circuit node along the target radiation path through the wavefront phase matching: Adaptive electromagnetic spectrum alignment is used to analyze the resonant frequency band characteristics of target slots or parasitic antennas and generate a spectrum filtering mask. During the injection process, the optical polarization state and spatial phase of the second excitation pulse are dynamically modulated so that the main lobe of the radiated broadband electromagnetic leakage signal is aligned with the resonant frequency band characteristics.

4. The femtosecond laser plasma shock wave enhanced electromagnetic damage method for unmanned aerial vehicles according to claim 1, characterized in that, The steps for real-time acquisition of the transient micro-deformation field distribution data of the shell induced by the directional ultra-high pressure shock wave include: Based on coaxial distributed interferometric detection and inverse propagation calculation, a three-dimensional point cloud sequence of transient deformation field on the shell surface is constructed; By reconstructing the refraction and reflection paths of stress waves in multilayer protective media using a spatiotemporal inverse propagation algorithm, and identifying stress concentration characteristics at internal structural nodes, the critical evolution state for microcrack initiation can be determined.

5. The femtosecond laser plasma shock wave enhanced electromagnetic damage method for unmanned aerial vehicles according to claim 1, characterized in that, Based on the synergistic evaluation results of mechanical stress transmission gradient and electromagnetic injection efficiency, the steps for dynamically reconstructing the time-domain delay interval and energy proportion allocation of subsequent pulse sequences include: Based on the mechanical-electromagnetic joint performance index evaluation, a coupled mapping relationship between microcrack propagation rate and internal circuit logic flip rate is established. When the coupling mapping relationship is characterized as performance decay, it automatically switches to high-frequency pulse superposition mode, and increases the repetition frequency of the second excitation pulse stepwise according to the feedback gradient of the logic flip rate, until the internal circuit network reaches an irreversible logic lock-up state.

6. The femtosecond laser plasma shock wave enhanced electromagnetic damage method for unmanned aerial vehicles according to claim 1, characterized in that: Before generating the initial excitation parameter set, the dielectric impedance characteristics and radiation path distribution information of the target surface are obtained. A multi-band environmental scattering inversion and wavefront pre-compensation architecture is used to obtain the turbulence intensity and attenuation coefficient distribution of the current transmission medium. Based on the attenuation coefficient, a phase pre-distortion is applied to the initial wavefront of the first ionization pulse and the second excitation pulse, and a self-focusing nonlinear modulation is introduced on the beam transmission path to compensate for the energy flux density attenuation caused by long-distance transmission, ensuring that the ionization threshold of the target surface is stably and with low thermal loss.

7. The femtosecond laser plasma shock wave enhanced electromagnetic damage method for unmanned aerial vehicles according to claim 1, characterized in that, The step of dynamically reconstructing the time-domain delay interval and energy ratio allocation of the subsequent pulse sequence until a preset hardware deactivation criterion is met includes: Multimodal state monitoring and safety fuse are employed to simultaneously monitor the step shift characteristics of the reflectance spectrum of the target area and the attenuation slope of the acoustic vibration signal. When the step drift characteristic reaches a preset fracture threshold and the acoustic signal exhibits exponential attenuation, it is determined that the internal structure has undergone penetrating damage. When the accompanying electromagnetic radiation noise drops to the background noise level, it is determined that the internal circuit network has lost its electromagnetic response capability. When the dual-state synchronization is achieved, the laser pulse sequence is immediately cut off and the optical path thermal balance protection mechanism is triggered.

8. A femtosecond laser plasma shockwave-enhanced electromagnetic damage device for unmanned aerial vehicles, using the method as described in any one of claims 1 to 7, characterized in that, include: The ultrafast pulse timing control cavity is equipped with a beam-splitting interferometer and a dynamic optical delay line, which is used to decouple the input single-beam femtosecond laser from the main excitation beam and the secondary ionization beam, and to adjust the energy level ratio and micro-delay window of the two beams in real time. The adaptive wavefront emission component, with its optical path connected to the output end of the ultrafast pulse timing control cavity, integrates a phase conjugate compensation lens group and a micro-displacement reflection array to eliminate atmospheric transmission distortion and dynamically lock the target irradiation area. A multimodal damage feedback array is arranged around the light-emitting aperture of the adaptive wavefront emitting component. It includes a broadband spectral analysis unit, a high-frequency acoustic sensing array, and a near-field electromagnetic probe for synchronously acquiring plasma expansion spectra, transient vibration spectra of the shell, and radiated electromagnetic field intensity. The central collaborative control core establishes high-frequency data bus connections with the ultrafast pulse timing control cavity, the adaptive wavefront emission component, and the multimodal damage feedback array, respectively. It integrates a timing-energy joint solver and a multiphysics mapping engine to reconstruct the displacement parameters of the dynamic optical delay line and the driving matrix of the phase conjugate compensation lens group based on real-time telemetry data, so as to realize the spatiotemporal superposition and focusing of plasma shock waves and broadband electromagnetic pulses inside the target.

9. The femtosecond laser plasma shock wave enhanced UAV electromagnetic damage device according to claim 8, characterized in that: The dynamic optical delay line adopts a closed-loop control structure consisting of a multi-stage reflection prism group and a piezoelectric micro-feeding mechanism. The central collaborative control core outputs a high-frequency compensation voltage to the piezoelectric micro-feeding mechanism to achieve continuous stepless adjustment of the time-domain interval between the first ionization pulse and the second excitation pulse.

10. The femtosecond laser plasma shock wave enhanced UAV electromagnetic damage device according to claim 8, characterized in that: The multiphysics mapping engine is equipped with parallel processing data decoupling channels. The first channel performs spatiotemporal inverse calculation of the micro-deformation field distribution of the shell to output the stress and pressure gradient field, and the second channel performs spectral feature extraction of the radiation electromagnetic field intensity to output the target equivalent coupling impedance spectrum. The multiphysics mapping engine performs tensor fusion calculations on the stress pressure gradient field and the equivalent coupling impedance spectrum to generate a damage performance heatmap, and outputs trajectory tracking commands for the micro-displacement reflection array based on the peak offset trajectory of the heatmap.

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