CN114251980B - Device for interfering and damaging cluster unmanned aerial vehicle - Google Patents
Device for interfering and damaging cluster unmanned aerial vehicle Download PDFInfo
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- CN114251980B CN114251980B CN202111578124.4A CN202111578124A CN114251980B CN 114251980 B CN114251980 B CN 114251980B CN 202111578124 A CN202111578124 A CN 202111578124A CN 114251980 B CN114251980 B CN 114251980B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F41—WEAPONS
- F41H—ARMOUR; ARMOURED TURRETS; ARMOURED OR ARMED VEHICLES; MEANS OF ATTACK OR DEFENCE, e.g. CAMOUFLAGE, IN GENERAL
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Abstract
The invention relates to the technical field of unmanned aerial vehicles, and provides a device for interfering and damaging a cluster unmanned aerial vehicle. When the unmanned aerial vehicle of bee colony scope is too big or too far away, the electromagnetic wave is lower at the field intensity of target department, strikes the relatively poor problem of effect. The system comprises a pulse fiber laser, an optical fiber, an optical waveguide delayer, a graphene film photoconductive switch and an ultra-wideband antenna unit which are sequentially connected, wherein laser emitted by the pulse fiber laser is sent into the optical waveguide delayer through the optical fiber, laser coupling output ends distributed in an array of the optical waveguide delayer output lasers with different time delays to the graphene film photoconductive switch, and then the graphene film photoconductive switch is electrified to control the state of the switch, so that whether each graphene film photoconductive switch generates electromagnetic waves to be transmitted out to the ultra-wideband antenna unit can be controlled, radiation of the electromagnetic waves with different phases generated by different switch combinations is selected to perform phase superposition in a specified direction, and beam synthesis is completed.
Description
Technical Field
The invention relates to the technical field of unmanned aerial vehicles, and provides a device for interfering and damaging a cluster unmanned aerial vehicle.
Background
With the development of unmanned aerial vehicle technology, especially the emergence of swarm unmanned aerial vehicle, brought serious challenge for the defense side, no matter survey, discovery and strike all are difficult, although laser can deal with unmanned aerial vehicle, its aim and transfer target all are difficult when facing swarm unmanned aerial vehicle, and efficiency is not high, and adopt the ultra wide band electromagnetic wave can kill and kill its face, especially adopt the method of light-operated phased array. The damage of the conventional broadband electromagnetic waves to the swarm unmanned aerial vehicle is the striking of the swarm unmanned aerial vehicle within the electromagnetic wave irradiation range in the divergence angle designed by the high-power antenna, the mode is simple and convenient, but when the swarm unmanned aerial vehicle is too large or too far, the field intensity of the electromagnetic waves acting on the target is lower, and the striking effect is poorer. In addition, when the unmanned aerial vehicle cluster is small or when swarm unmanned aerial vehicles exist at different distances within a small-angle range, most of electromagnetic pulses emitted by a single large divergence angle are not used, the field intensity acting on a target is low, the hitting effect is poor, the phased array antenna technology is adopted, all or part of positive elements of an antenna array can converge in a certain direction, and the other part of positive elements converge in the other direction, so that different beam control strategies can be adopted according to different swarm unmanned aerial vehicles, and the interference and damage of the swarm unmanned aerial vehicles are efficiently solved.
Disclosure of Invention
The invention aims to solve the problems that the damage of the conventional broadband electromagnetic waves to the swarm unmanned aerial vehicle is the striking of the swarm unmanned aerial vehicle within the electromagnetic wave irradiation range within the divergence angle designed by the high-power antenna, the mode is simple and convenient, but when the swarm unmanned aerial vehicle is too large or too far away, the electromagnetic waves act on the target, the field intensity is lower, and the striking effect is poorer.
In order to achieve the purpose, the invention adopts the following technical scheme:
a device for interfering and damaging a cluster unmanned aerial vehicle comprises a pulse fiber laser, an optical fiber, an optical waveguide delayer, a graphene film photoconductive switch and an ultra-wideband antenna unit which are sequentially connected, wherein laser emitted by the pulse fiber laser is sent into the optical waveguide delayer through the optical fiber, laser coupling output ends distributed in an array of the optical waveguide delayer output lasers with different time delays to the graphene film photoconductive switch, then the graphene film photoconductive switch is electrified to control the state of the switch, so that whether electromagnetic waves are generated by each graphene film photoconductive switch or not can be controlled to be emitted to the ultra-wideband antenna unit, radiation of the electromagnetic waves with different phases generated by different switch combinations is selected to perform phase superposition in a specified direction, and beam synthesis is completed. The specific synthesis method comprises the following steps: according to the azimuth and distance information of the target, the computer selects different switches according to a shooting table formed by design and training in advance, corresponding to different delay amounts, and points the coherent-synthesized beam main lobe to the target according to the difference of phases, thereby realizing the interference and damage of the maximum power density. Such as: the maximum power density can be designed to be synthesized on the array antenna axis when all switches are open. The following steps are repeated: when two adjacent columns are opened, beam synthesis in a direction of 10 degrees with the center can be realized, different combinations are selected, beam scanning can be realized, the more array elements are, the smaller the time delay amount is, the more accurate the beam scanning is, and the wider the scanning range is.
In the above technical scheme, the optical waveguide delay comprises an optical fiber splitter, a laser coupling input end, an optical waveguide and a laser coupling output end, wherein the optical waveguide is of an inclined surface structure, an array formed by the laser coupling output ends is arranged on the inclined surface structure, each row of the array is correspondingly provided with one laser coupling input end, and after entering from the laser coupling input end, laser is sequentially output to each laser coupling output end of the current row.
In the above technical solution, the graphene film photoconductive switch includes a semiconductor substrate having a gate structure, a first transition layer, a first graphene film and a cathode sequentially disposed on the semiconductor substrate, and a second transition layer, a second graphene film and an anode sequentially disposed on the semiconductor substrate.
In the technical scheme, the first transition layer, the first graphene film and the cathode are sequentially arranged on the upper surface of the semiconductor substrate;
the second transition layer, the second graphene film and the anode are sequentially arranged on the upper surface or the lower surface of the semiconductor substrate.
In the technical scheme, the ultra-wideband antenna unit comprises an impedance converter and an index involute antenna connected with the impedance converter, wherein an outer cover is sleeved outside the index involute antenna, and transformer oil used for immersing the index involute antenna is arranged in the outer cover.
In the above technical scheme, the exponential involute antenna comprises an antenna outer cylinder and an antenna outer cylinder, wherein polar plates are respectively arranged on the antenna outer cylinder and an antenna inner core, each polar plate comprises a bottom end and a top end, the width of each polar plate is gradually widened from the bottom end and along the top end, and the top end of each polar plate is of an inward-rolling structure.
In the technical scheme, the two pole plates are connected through the support rod.
In the technical scheme, the axes of the antenna outer cylinder and the antenna inner core are coaxial and parallel.
The invention also provides a control method of the device for interfering and damaging the cluster unmanned aerial vehicle, which is characterized in that different switches are selected according to the azimuth and distance information of the target and a shooting table formed by pre-design and training, corresponding to different delay amounts, and coherent-synthesized beam main lobes are directed to the target according to different phases, so that the interference and damage of the maximum power density are realized.
Because the invention adopts the technical scheme, the invention has the following beneficial effects:
the ultra-wideband electromagnetic waves generated by the graphene film photoconductive switch are radiated out from the corresponding antenna by controlling the delay amount of each switch through the beam controller, because the different delay amounts form beam synthesis in different directions, beam scanning is realized through the control of the delay amount, the ultra-wideband electromagnetic waves generated by all the switches can be controlled to synthesize and strike a single target in the same target direction, and the targets in different directions can also be synthesized and struck by different numbers of switches in different directions, so that the intelligent striking cluster unmanned aerial vehicle can realize the remote striking of the single target and the multi-target striking capability in a short distance.
Drawings
Fig. 1 is a schematic diagram of a cluster drone installation for jamming and damage;
FIG. 2 is a schematic diagram of an optical waveguide delay;
figure 3 is a schematic diagram of a layered structure in which the anode and cathode are disposed on opposite sides in a graphene film photoconductive switch,
FIG. 4 is a top view of a graphene film photoconductive switch with the anode and cathode disposed on the same side;
fig. 5 is a sectional view of fig. 4 in a side view state;
fig. 6 is a schematic diagram of an ultra-wideband antenna unit;
figure 7 is a cross-sectional view of an ultra-wideband antenna unit;
FIG. 8 is a schematic diagram of an exponential involute antenna;
FIG. 9 is a schematic view of an antenna core;
FIG. 10 is a schematic diagram of an impedance transformer;
the system comprises a 1-optical fiber laser, a 2-optical fiber, a 3-optical waveguide delayer, a 4-graphene film photoconductive switch, a 5-ultra-wideband antenna unit, a semiconductor substrate 4-1, a first transition layer 4-2, a first graphene film 4-3, a cathode 4-4, a second transition layer 4-5, a second graphene film 4-6 and an anode 4-7, wherein the first transition layer is a first transition layer; the antenna comprises a 5-A-exponential involute antenna, a 5-1-impedance transformer, a 5-2-connecting end, a 5-2-2-connecting end outer barrel, a 5-3-coaxial wedge feed balun, a 5-3-1-antenna inner core, a 5-3-1-1-antenna inner core bottom end, a 5-3-1-2-antenna inner core top end, a 5-3-2-antenna outer barrel, a 5-4-outer cover, a 5-5-polar plate, a 5-5-1-inner roll structure, a 5-5-2-bottom end, a 5-5-3-top end and a 5-6-supporting rod.
Detailed Description
Hereinafter, a detailed description will be given of embodiments of the present invention. While the invention will be described and illustrated in connection with certain specific embodiments thereof, it should be understood that the invention is not limited to those embodiments. Rather, modifications and equivalents of the invention are intended to be included within the scope of the claims.
Furthermore, in the following detailed description, numerous specific details are set forth in order to provide a better understanding of the present invention. It will be understood by those skilled in the art that the present invention may be practiced without these specific details.
The principle of the interference and damage cluster unmanned aerial vehicle device shown in fig. 1 is as follows: the pulse laser generates ultra-wideband electromagnetic waves when acting on the graphene film photoconductive switches, the ultra-wideband electromagnetic waves are radiated out through the ultra-wideband antenna unit, the electromagnetic waves generated by the graphene film photoconductive switches are synthesized at a target, and because the phase of the electromagnetic waves can be controlled through the time of turning on each switch, namely the time delay, different switch combinations can be achieved, electromagnetic wave beams in different directions can be synthesized, and therefore the unmanned aerial vehicle cluster in different directions can be struck and interfered.
The wave beam controller is a key and consists of a waveguide delayer 3, a graphene film photoconductive switch 4 and an array ultra-wideband antenna unit 5, the waveguide optical delayer replaces a phase shifter to realize deflection of wave beams, phase shift errors can be greatly reduced, electric scanning of the light beams is controlled, and the light-operated phased array is actually formed to realize accurate control of the wave beams.
In phased array radar or electromagnetic wave synthesis, a phase shifter is used for controlling and shifting the phase of electromagnetic waves emitted by an antenna array element, and the phase shift precision determines the efficiency and precision of beam synthesis and deflection of a phased array antenna, so that phase difference and beam inclination are often caused. The optical waveguide light real-time delayer can accurately control the phase of electromagnetic waves, and realize high-efficiency beam synthesis and large-range accurate scanning, namely a light-controlled phased array.
The optical waveguide delay 3 includes: the optical fiber beam splitter 3-1, the laser coupling output end 3-2, the optical waveguide 3-3 and the laser coupling output end 3-4 irradiate the corresponding graphene film photoconductive switch 4.
As shown in fig. 2, the optical waveguide is formed in a wedge shape, that is, the thickness of the optical waveguide increases or decreases along one direction, and the optical fiber splitter (1 × 7, 1 × 19, 1 × N, or the like) splits the pulse laser into 7, 19, or N paths, that is, the leftmost column in fig. 2, and 4 paths in fig. 2; in the embodiment of the present invention, as shown in fig. 2, the number of each branch is 8, the corresponding number is 0101-0108 (rows and columns), and the time delay between two adjacent branches is Δ t 1 ，
Wherein
C is the speed of light, d 1 Is the distance between adjacent measuring branches, h 1 Is the waveguide thickness of the current leg.
The second path (second line) is numbered 0201-0208 (row and column), and the time delay difference between two adjacent paths is delta t 2 The distance between each road is L (the distance between the second road and the first road is L), and so on, delta t 1 、Δt 2 、.. Δt n Is a fixed known quantity. The reflectivity of each branch waveguide in each path in the optical waveguide is different, the difference of the laser power entering from 0101-0108 coupling is controlled within 10% as much as possible, thus the laser is divided into N output ends to irradiate the optical waveguide switch to generate electromagnetic waves, whether each switch generates the electromagnetic waves can be controlled only by controlling the power on or off of the corresponding switch, that is, different switch combinations are selected to generate the radiation of the electromagnetic waves, different delays correspond to different beam synthesis, thereby realizing the scanning of the beams, different delay amounts and different phases of the electromagnetic waves, the electromagnetic waves with different phases generate the beam synthesis in different directions, and the computer digital beam forming can be carried out according to the direction of the target and the number of the target, thereby realizing the intelligent beam synthesis and scanning, and realizing the multi-target hitting ability of unmanned aerial vehicles, missiles and other targetsAnd the single-target accurate damage capability, and is an effective scheme for solving the threat of targets such as swarm unmanned aerial vehicles.
Graphene film photoconductive switch
The graphene film photoconductive switch adopts a different-surface electrode structure, as shown in fig. 3, a grid-type structure is etched on a semiconductor substrate, a layer of graphene film is added below a switch electrode, laser spots matched with the grid-type structure are irradiated on the grid-type structure in a strip shape, a special current channel is formed, surface plasma filamentation current is prevented from damaging the switch, the surface current density is reduced, and a body current form is formed, namely, the problem that plasma filamentation current is caused by high surface current density of a traditional switch is overcome, so that the switch is burnt, and the switch is changed into body current to bear higher voltage.
The concrete structure is as follows:
the graphene film photoconductive switch 4 comprises a semiconductor substrate 4-1 with a grid structure, a first transition layer 4-2, a first graphene film 4-3 and a cathode 4-4 which are sequentially arranged on the semiconductor substrate 4-1, and a second transition layer 4-5, a second graphene film 4-6 and an anode 4-7 which are sequentially arranged on the semiconductor substrate 4-1. The first transition layer 4-2, the first graphene film 4-3 and the cathode 4-4 are sequentially arranged on the upper surface of the semiconductor substrate 4-1; the second transition layer 4-5, the second graphene film 4-6 and the anode 4-7 are sequentially arranged on the upper surface or the lower surface of the semiconductor substrate 4-1, which means that the first transition layer 4-2, the first graphene film 4-3 and the cathode 4-4 can be arranged on the same side or opposite sides as the second transition layer 4-5, the second graphene film 4-6 and the anode 4-7.
The semiconductor substrate 4-1 is prepared from one of gallium arsenide or silicon carbide with the purity of more than 99.999 percent, and a periodic groove, namely a gate type structure 4-8, is etched.
The first transition layer 4-2 and the second transition layer 4-5 are made of metal, and the first transition layer 4-2 and the second transition layer 4-5 are made of one of platinum or palladium, but other metals can be used.
The first graphene film 4-3 and the second graphene film 4-6 are single-layer graphene, and the thickness is of the mum magnitude.
The cathode 4-4 and the anode 4-7 are made of copper plated with gold.
The semiconductor substrate 4-1 is etched with periodic grooves having a width of 1mm to 3mm, such as 2mm, a length of 10mm to 20mm, such as 11mm, 12mm or 13mm, and a depth of about 3 mm. In practice, the triggered laser spot (shown in FIG. 3 as a stripe laser) is 1mm to 2mm wide and 10mm to 20mm long, matching the periodic slots, thus forming a current path as shown in FIG. 4.
The working principle is as follows: the strip laser pulse triggers the corresponding grid structure semiconductor, under the bias of an electric field, the GaAs/SiC of the photoconductive material (semiconductor substrate) absorbs photons to generate electron-hole pairs, and outputs a large-amplitude electric pulse in a corresponding current channel, so that a photoconductive switch with higher power can be obtained under the grid structure. And due to the addition of the graphene film, the heat dissipation strip shape and the electron mobility of the switch are improved, the steeper the rising edge of the generated pulse is, the wider the frequency band of the generated ultra-wideband electromagnetic pulse is. The carrier mobility of graphene at room temperature is about 15000cm 2 And V · s), and has very good heat conduction performance, and the addition of the graphene film greatly improves ohmic contact, voltage resistance and heat dissipation characteristics of the electrode, the transition layer and the GaAs/SiC, and has faster switching speed, higher voltage resistance and higher bearable power density.
In summary, the addition of the strip-shaped light spot matching grid structure and the graphene film further improves the heat dissipation characteristic and the performance of the switch. The voltage resistance, power, bandwidth, repetition frequency and service life of the pulse power device formed by the method are greatly improved. The problems of low voltage resistance, short service life, low repetition frequency and the like of the photoconductive semiconductor switch are solved, and the photoconductive semiconductor switch as a core device of an interference machine, a radar and the like directly influences the achievable power level and the fighting distance.
Ultra-wideband antenna unit
The ultra-wideband antenna unit 5 comprises an impedance converter 5-1 and an index gradually-opening antenna 5-A connected with the impedance converter 5-1, wherein an outer cover 5-4 is sleeved outside the index gradually-opening antenna, and transformer oil used for immersing the index gradually-opening antenna 5-A is arranged in the outer cover 5-4.
In the technical scheme, the exponential involute antenna 5-A comprises a coaxial wedge feed balun 5-3, the coaxial wedge feed balun comprises an antenna inner core 5-3-1 and an antenna outer cylinder 5-3-2, and polar plates 5-5 are respectively arranged on the antenna outer cylinder 5-3-2 and the antenna inner core 5-3-1.
In the technical scheme, the polar plate 5-5 comprises a bottom end 5-5-2 and a top end 5-5-3, and the width of the polar plate 5-5 is gradually widened from the bottom end 5-5-2 and along the top end 5-5-3.
In the technical scheme, the top end 5-5-3 of the polar plate 5-5 is of an inward-rolling structure 5-5-1.
In the technical scheme, the two polar plates 5-5 are connected through the support rods 5-6.
In the technical scheme, the axes of the antenna outer cylinder 5-3-2 and the antenna inner core 5-3-1 are coaxially parallel.
In the technical scheme, a connecting end 5-2 is further arranged between the exponential involute antennas 5-A connected with the impedance transformation section 5-1, and the connecting end 5-2 comprises a connecting end outer barrel 5-2-1 and a splicing inner core 5-2-2.
In the technical scheme, the impedance converter 5-1 comprises a transition outer cylinder 5-1-1 and a transition inner core 5-1-4, wherein the transition inner core 5-1-4 is fixed in the transition outer cylinder 5-1-1 through a lower transition insulator 5-1-2 and an upper transition insulator 5-1-3.
In the technical scheme, the antenna inner core 5-3-1 is in a cylindrical gradually-changing flat shape from the bottom end 5-3-1-1 of the antenna inner core to the top end 5-3-1-2 of the antenna inner core.
The inner core of the coaxial wedge feed balun of the ultra-wideband antenna unit is coaxially parallel to the axis of the outer cylinder of the antenna, the coaxial wedge feed balun solves the problem of impedance matching in a wide bandwidth range, the transmitting gain of the antenna is improved, and the coaxial wedge feed balun is a device which changes high-frequency signals from single-ended input into balanced output and completes different impedance matching of two input and output ports. In order to achieve the purpose of converting the unbalanced structure of the coaxial line into the balanced structure of the parallel double lines, a notch is cut in the longitudinal direction of the coaxial line outer conductor according to a specific change rule, so that the impedance of a point on the notch can be changed, and the reflection coefficient in a pass band is distributed according to a Chebyshev function. It has two typical characteristics of balun: impedance transformation and balun transformation.
The designed balun of the ultra-wideband antenna unit realizes impedance conversion from 100 ohms to 60 ohms, the generated ultra-wideband electromagnetic pulse is efficiently radiated out through the exponential involute antenna, the frequency band width reaches 180 MHz-3 GHz, and the ultra-wideband antenna unit can work in the power capacity of 1 MV. Can interfere and damage electronic equipment such as a remote unmanned aerial vehicle.
The ultra-wideband antenna unit works at the power capacity of 1MV, 100 ten thousand volts of high voltage can be formed between polar plates, and the polar plates are easy to ionize to form sparks to cause device burnout.
The ultra-wideband antenna unit 5 integrally seals transformer oil in impedance transformation, nylon jackets and the like, ignition is avoided, and meanwhile, the index gradually-opened antenna also ensures high-efficiency radiation of ultra-wideband.
Claims (8)
1. A device for interfering and damaging a cluster unmanned aerial vehicle is characterized by comprising a pulse optical fiber laser (1), an optical fiber (2), an optical waveguide delayer (3), a graphene film photoconductive switch (4) and an ultra-wideband antenna unit (5) which are sequentially connected, wherein laser emitted by the pulse optical fiber laser (1) is sent into the optical waveguide delayer (3) through the optical fiber (2), laser coupling output ends (3-4) distributed in an array of the optical waveguide delayer output lasers with different delays to the graphene film photoconductive switch (4), and then the graphene film photoconductive switch (4) is powered up to control the on-off state, so that whether each graphene film photoconductive switch (4) generates electromagnetic waves or not to be emitted to the ultra-wideband antenna unit (5) can be controlled, radiation of the electromagnetic waves with different phases generated by different switch combinations is selected to perform phase superposition in a specified direction, and beam synthesis is completed;
the optical waveguide delayer (3) comprises an optical fiber beam splitter (3-1), a laser coupling input end (3-2), an optical waveguide (3-3) and a laser coupling output end (3-4), wherein the optical waveguide (3-3) is of an inclined plane structure (3-3-1), an array formed by the laser coupling output ends (3-4) is arranged on the inclined plane structure (3-3-1), each row of the array is correspondingly provided with one laser coupling input end (3-2), and laser enters from the laser coupling input end (3-2) and is sequentially output to each laser coupling output end (3-4) of the current row.
2. The device for interfering and destroying the clustered unmanned aerial vehicle according to claim 1, wherein the graphene film photoconductive switch (4) comprises a semiconductor substrate (4-1) with a grid structure, a first transition layer (4-2), a first graphene film (4-3) and a cathode (4-4) which are sequentially arranged on the semiconductor substrate (4-1), and a second transition layer (4-5), a second graphene film (4-6) and an anode (4-7) which are sequentially arranged on the semiconductor substrate (4-1), wherein the semiconductor substrate (4-1) is made of one of gallium arsenide or silicon carbide with a purity of more than 99.999%, and periodic grooves, namely the grid structure (4-8), are etched.
3. An apparatus for disturbing and destroying clustered drones, according to claim 2, characterized in that said first transition layer (4-2), said first graphene film (4-3) and said cathode (4-4) are arranged in sequence on the upper surface of a semiconductor substrate (4-1);
the second transition layer (4-5), the second graphene film (4-6) and the anode (4-7) are sequentially arranged on the upper surface or the lower surface of the semiconductor substrate (4-1).
4. An arrangement for jamming and damaging trunked drons according to claim 1, characterised in that the ultra-wideband antenna unit (5) comprises an impedance transformer (5-1), an exponentially diverging antenna (5-a) connected to the impedance transformer (5-1), a cover (5-4) surrounding the exponentially diverging antenna, and a pressure-varying oil arranged inside the cover (5-4) for submerging the exponentially diverging antenna (5-a).
5. The device for interfering with and destroying a trunked unmanned aerial vehicle according to claim 4, wherein the exponentially-involute antenna (5-A) comprises an outer antenna cylinder (5-3-2) and an inner antenna core (5-3-1), a pole plate (5-5) is arranged on the outer antenna cylinder (5-3-2) and the inner antenna core (5-3-1), the pole plate (5-5) comprises a bottom end (5-5-2) and a top end (5-5-3), the width of the pole plate (5-5) gradually widens from the bottom end (5-5-2) to the top end (5-5-3), and the top end (5-5-3) of the pole plate (5-5) is in an inward-rolling structure (5-5-1).
6. A device for interfering and destroying unmanned aerial vehicles clusters according to claim 5, wherein the two pole plates (5-5) are connected by means of support rods (5-6).
7. A device for interfering and damaging a cluster drone according to claim 2, characterized in that the outer antenna cylinder (5-3-2) is coaxial and parallel to the axis of the inner antenna core (5-3-1).
8. A control method of a device for interfering and destroying cluster unmanned aerial vehicles according to any one of claims 1 to 7, characterized in that, according to the azimuth and distance information of the target, according to the shooting table designed and trained in advance, different graphene film photoconductive switches (4) are selected to correspond to the laser with different time delays, and according to the difference of phases, the coherent-synthesized main beam lobe is directed to the target, so as to realize the interference and destruction with maximum power density.
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| CN110767978A (en) * | 2019-09-29 | 2020-02-07 | 西北核技术研究院 | Ultra-wide spectrum electromagnetic pulse radiation antenna |
| CN111129185A (en) * | 2019-12-26 | 2020-05-08 | 西安交通大学 | Different-surface structure GaAs photoconductive switch based on graphene interface layer and preparation process thereof |
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