Large electromagnetic pulse directional radiation system with inflatable supporting structure

Abstract

The invention belongs to the technical field of electromagnetic pulse radiation, and relates to a large electromagnetic pulse directional radiation system with an inflatable support structure, which comprises a directional radiation stay wire antenna, an inflatable support structure and a high-voltage pulse source, the inflatable supporting structure supports and fixes the directional radiation stay wire antenna, and the high-voltage pulse source outputs electromagnetic pulses; the large directional radiation stay antenna is supported by the inflatable air bag, so that the directional radiation stay antenna with the height exceeding 5m can be quickly unfolded outdoors, the size of the antenna and the whole weight of the system are greatly reduced, and the problems that a traditional electromagnetic pulse simulator occupies a large area and cannot be moved to a site where large equipment is located are solved; and a technical means is provided for carrying out an electromagnetic pulse radiation vulnerability test on large-scale equipment. The technical problem that an existing electromagnetic pulse directional radiation system is low in radiation efficiency and inconvenient to unfold is solved.

Description

Technical Field

[0001] The invention belongs to the technical field of electromagnetic pulse radiation, and relates to a large-scale electromagnetic pulse directional radiation system with an inflatable support structure. Background Art

[0002] With the rapid development of information technology, modernization, and automation in equipment, and the widespread application of electronic integration technology, electromagnetic pulses (EMPs) pose a significant threat to various electrical and electronic systems. For critical national infrastructure, such as power systems and oil and gas pipelines, the EMI resistance of electrical and electronic equipment has received significant attention, with EMP vulnerability testing and assessment required for critical equipment.

[0003] Existing EMP test equipment is mostly bounded wave or radiation wave simulators located in remote areas, occupying large areas and being difficult to move. Large electrical equipment, such as large transformers and reactors, cannot be easily moved to traditional fixed EMP simulators for testing. Given the high construction costs of fixed test sites, it is not advisable for organizations to duplicate these facilities. There is an urgent need for EMP radiation vulnerability testing systems that can be moved to the location of large equipment and conducted on-site. These issues make field EMP vulnerability testing of equipment difficult, severely hindering protective reinforcement efforts.

[0004] To meet the needs of conducting full-scale EMP radiation vulnerability testing on large equipment, an EMP directional radiation system must be capable of generating an EMP radiation environment within a workspace of several hundred cubic meters, with the electromagnetic field meeting the waveform parameter requirements of GJB8848. However, the main problem with existing EMP directional radiation systems is that the low-frequency components of the EMP are difficult to radiate, resulting in a narrow pulse width of the simulated EMP field. Existing antennas use a flat-plate structure and are heavy, making it difficult to construct a large, easily deployable directional radiation antenna.

[0005] Therefore, it is necessary to propose a large-scale electromagnetic pulse directional radiation system that can be easily deployed and has high radiation efficiency. Summary of the Invention

[0006] The purpose of the present invention is to provide a large-scale electromagnetic pulse directional radiation system with an inflatable support structure to solve the technical problems of low radiation efficiency and inconvenient deployment of existing electromagnetic pulse directional radiation systems.

[0007] In order to achieve the above object, the present invention adopts the following technical solutions: The present application discloses a large-scale electromagnetic pulse directional radiation system with an inflatable support structure, comprising a directional radiation pull-wire antenna, an inflatable support structure and a high-voltage pulse source; the inflatable support structure supports and fixes the directional radiation pull-wire antenna, the directional radiation pull-wire antenna comprises a ground plate, the high-voltage pulse source is arranged on the ground plate, the high-voltage pulse source is connected to a front transition plate, the front transition plate is sequentially connected to a front wire grid, an upper curling wire grid, a horizontal loading circuit wire grid, a vertical loading circuit and a load resistor, and the load resistor is connected to the ground plate.

[0008] Preferably, the front wire grid, upper curling wire grid, horizontal loading loop wire grid and vertical loading loop are all composed of a plurality of conductive metal wires, and the number of vertical loading loops is the same as the number of load resistors, and the load resistors are arranged on the ground plane at equal intervals along a straight line.

[0009] Preferably, each tension wire in the front wire grid, the upper curling wire grid, and the horizontal loading loop wire grid is an independent whole conductive metal wire, the conductive metal wires are aligned and kept equidistant, and the conductive metal wires are kept taut.

[0010] Preferably, the plane where the front wire grid is located is in the same plane as the front transition plate, and the angle between the plane where the front wire grid is located and the horizontal plane is not greater than 45 degrees.

[0011] Preferably, the size of the directional radiation wire antenna satisfies the following formula:

[0012] Where: S is the total lateral area of the directional radiation wire antenna; Z 0 is the vacuum wave impedance; ε 0 is the dielectric constant of vacuum; c is the speed of light; l It is the horizontal length from the end of the front wire grid to the entrance of the front transition plate; h is the vertical distance between the end of the front wire grid and the ground plane.

[0013] Preferably, the inflatable support structure includes a left support column airbag and a right support column airbag, the bottom ends of the left support column airbag and the right support column airbag are arranged on the ground plate, and a top flat plate airbag is fixed on the top, and an end cylindrical airbag is fixed on the side of the top flat plate airbag adjacent to the right support column airbag, which is used to support and fix the upper curling wire grid, and a number of counterweights are respectively provided on the bottom surfaces on both sides where the left support column airbag and the right support column airbag are located, and the counterweights are connected to the left support column airbag, the right support column airbag, the top flat plate airbag and the end cylindrical airbag through a pull rope, and the horizontal loading circuit wire grid is fixed on the upper surface of the top flat plate airbag.

[0014] Preferably, a plurality of holes are provided on the left support column airbag and the right support column airbag.

[0015] Preferably, when the high-voltage pulse source is working, a pulsed high voltage is generated on the output electrode 15 thereon.

[0016] Preferably, the output waveform of the high-voltage pulse source is a double exponential wave voltage pulse with a leading edge no slower than 2ns and a pulse width no less than 30ns, and the sum of the output voltage peaks is U Vertical distance from the front wire grid end and the ground plane h The ratio relationship is: .

[0017] Preferably, it is characterized in that the end where the front wire grid is connected to the upper curled wire grid is the front wire grid end, and the ratio of the width of the front wire grid end to the vertical distance from the front wire grid end to the ground plate is not greater than 2.

[0018] Compared with the prior art, the present invention has the following beneficial effects: The present invention uses an inflatable airbag to support a large directional radiation pull-wire antenna, which can enable a directional radiation pull-wire antenna with a height of more than 5m to be quickly deployed outdoors, greatly reducing the antenna volume and the weight of the entire system. It solves the problem that traditional electromagnetic pulse simulators occupy a large area and cannot be moved to the site where large equipment is located, and provides a technical means for conducting electromagnetic pulse radiation vulnerability testing on large equipment.

[0019] The directional radiation wire antenna adopts the method of loading the matching load on the back, supporting the wire grid and fixing the shape of the wire grid through the airbag. While optimizing the radiation efficiency of the antenna at the low and medium frequencies, it ensures the stability of the antenna shape, making the electric field waveform generated by the electromagnetic pulse directional radiation system stable and complying with standards such as GJB 8848. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for use in the embodiments. It should be understood that the following drawings only illustrate certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying any creative work.

[0021] Figure 1 It is a structural schematic diagram of the present invention; Figure 2 It is a rear view structural schematic diagram of the present invention; Figure 3 Schematic diagram of the structure of the directional radiation wire antenna in the present invention; Figure 4 It is a schematic side view of the structure of the directional radiation wire antenna of the present invention; Figure 5This is a schematic diagram of the local structure of the connection between the high-voltage pulse source and the directional radiation wire antenna in the present invention; Figure 6 This is a working principle diagram of the directional radiation wire grid antenna in the present invention.

[0022] Among them: 1-front transition plate; 2-front wire grid; 3-upper curling wire grid; 4-horizontal loading circuit wire grid; 5-vertical loading circuit; 6-load resistor; 7-ground plate; 8-high voltage pulse source; 9-left support column airbag; 10-right support column airbag; 11-top flat airbag; 12-end cylindrical airbag; 13-counterweight; 14-pull rope; 15-output electrode. DETAILED DESCRIPTION

[0023] To make the objectives, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions of the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings herein can be arranged and designed in various different configurations.

[0024] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention as claimed, but rather merely represents selected embodiments of the present invention. All other embodiments derived by persons of ordinary skill in the art based on the embodiments of the present invention without creative effort shall fall within the scope of protection of the present invention.

[0025] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, it does not need to be further defined or explained in subsequent drawings.

[0026] In the description of the embodiments of the present invention, it should be noted that if the terms "upper," "lower," "horizontal," "inner," etc. appear, the orientation or positional relationship indicated is based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship in which the inventive product is typically placed when in use. These terms are merely for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or component referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on the present invention. In addition, the terms "first," "second," etc. are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0027] In addition, if the term "horizontal" appears, it does not mean that the component must be absolutely horizontal, but can be slightly tilted. For example, "horizontal" only means that its direction is more horizontal than "vertical", and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0028] In the description of the embodiments of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "disposed," "installed," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; and they can refer to internal connections between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0029] The present invention is described in further detail below with reference to the accompanying drawings: See also Figure 1 The present invention provides a large-scale electromagnetic pulse directional radiation system with an inflatable support structure, comprising a directional radiation wire antenna, an inflatable support structure, and a high-voltage pulse source 8. The inflatable support structure supports and secures the directional radiation wire antenna, which includes a ground plate 7. The high-voltage pulse source 8 is disposed on the ground plate 7 and is connected to a front transition plate 1. The front transition plate 1 is sequentially connected to a front wire grid 2, an upper curling wire grid 3, a horizontal loading loop wire grid 4, a vertical loading loop 5, and a load resistor 6. The load resistor 6 is connected to the ground plate 7. This system is a large-scale electromagnetic pulse directional radiation system with an inflatable support structure and a wire antenna. It can generate an electromagnetic pulse radiation environment in a workspace of no less than 100 cubic meters, with a leading edge of no more than 3 ns, a pulse width of 23±5 ns, and a peak field strength of no less than 50 kV / m. The system can be quickly deployed outdoors, solving the problem of conducting on-site electromagnetic pulse irradiation tests for large-scale equipment.

[0030] In some embodiments, the directional radiating wire antenna comprises a front transition plate 1, a front wire grid 2, an upper curled wire grid 3, a horizontal loading loop wire grid 4, a vertical loading loop 5, a load resistor 6, and a ground plane 7, forming a bilaterally symmetrical structure. The input of the front transition plate 1 is connected to the output electrode 15 of a high-voltage pulse source 8; the front transition plate 1 is connected to the front wire grid 2. Each wire in the front wire grid 2, the upper curled wire grid 3, and the horizontal loading loop wire grid 4 is a single, independent conductive metal wire. The horizontal loading loop wire grid 4 is connected to the load resistor 6 via the vertical loading loop 5, and the load resistor 6 is connected to the ground plane 7.

[0031] Further preferably, the plane where the front wire grid 2 is located is in the same plane as the front transition plate 1. The angle between the plane where the front wire grid 2 is located and the horizontal plane is not greater than 45 degrees.

[0032] Further preferably, one end of the front wire grid 2 connected to the upper curled wire grid 3 is the front wire grid end, and the ratio of the width of the front wire grid end to the vertical distance between the front wire grid end and the ground plate is not greater than 2.

[0033] Further preferably, the front wire grid 2 , the upper curling wire grid 3 , the horizontal loading loop wire grid 4 , and the vertical loading loop 5 are composed of a plurality of conductive metal wires.

[0034] Preferably, the number of vertical loading loops is equal to the number of load resistors, which are arranged at equal intervals. The number of load resistors is not less than 6, and the parallel resistance of the load resistors is approximately equal to the characteristic impedance of the directional radiation wire antenna.

[0035] Preferably, to improve the antenna radiation performance, the dimensions of the directional radiation wire grid antenna satisfy the following relationship:

[0036] Where: S is the total lateral area of the directional radiation wire antenna; Z 0 is the vacuum wave impedance; ε 0 is the dielectric constant of vacuum; c is the speed of light; l It is the horizontal length from the end of the front wire grid to the entrance of the front transition plate; h is the vertical distance between the end of the front wire grid and the ground plane.

[0037] In some embodiments, the inflatable support structure includes a left support column airbag 9, a right support column airbag 10, a top flat airbag 11, an end cylindrical airbag 12, a pull rope 14, and a counterweight 13. The left support column airbag 9 and the right support column airbag 10 are connected to the two sides of the top flat airbag 11, and the end cylindrical airbag 12 is connected to the front of the top flat airbag 11. The air pressure of each airbag is independently controlled. After inflation, the left support column airbag 9 and the right support column airbag 10 utilize the gas pressure characteristics to have a certain rigidity, thereby supporting the top flat airbag 11 to form a stable support structure. Several counterweights 13 are set on the ground on both sides and connected to each airbag through a pull rope 14 to play a role in fixing and preventing shaking.

[0038] The top flat airbag 11 and the end cylindrical airbag 12 support the wire grid shape. The upper curled wire grid 3 of the directional radiation wire antenna is fixed to the surface of the end cylindrical airbag 12, and the horizontal loading circuit wire grid 4 is fixed to the upper surface of the top flat airbag 11.

[0039] Furthermore, the left support column airbag 9, the right support column airbag 10, the top flat airbag 11, and the end cylindrical airbag 12 are made of PVC material, which is airtight and can withstand working pressure. The use of this insulating material avoids affecting the waveform of the electric field generated by the directional radiation system.

[0040] Furthermore, the left support column airbag 9, the right support column airbag 10, the top flat airbag 11, and the end cylindrical airbag 12 are inflated by an air pump, and the inflated gas is air.

[0041] Furthermore, the total number of counterweights 13 is not less than 6, symmetrically distributed on both sides, and the total weight is not less than 2 tons.

[0042] Preferably, the left support column airbag 9 and the right support column airbag 10 have a pressure of several kPa in order to have a certain supporting strength.

[0043] Preferably, the top flat plate airbag 11 has a pressure of several tens of kPa, in order to ensure the strength and flatness of the top flat plate.

[0044] Preferably, there is a pressure of several kPa in the end cylindrical airbag 12, so as to ensure that the curled wire grid on the antenna fixed on the end cylindrical surface has an arc shape.

[0045] Preferably, the pull rope 14 is made of nylon rope in order to avoid introducing metal materials so as to avoid affecting the waveform of the electric field generated by the directional radiation system.

[0046] Preferably, a plurality of holes are left on the sides of the left support column airbag 9 and the right support column airbag 10 in order to reduce the impact force caused by the side wind.

[0047] In some embodiments, the high voltage pulse source 8 is installed between the ground plate 7 and the front transition plate 1. When in operation, the pulse source generates a pulse high voltage on the output electrode 15, driving the wire antenna to generate an electromagnetic pulse radiation environment.

[0048] Furthermore, the casing of the high-voltage pulse source 8 is made of non-metallic materials, such as fiberglass, nylon, etc., in order to improve the insulation capacity and reduce the weight of the pulse source.

[0049] Furthermore, the high voltage pulse source 8 is internally insulated with gas insulated material in order to reduce weight.

[0050] Preferably, the high voltage pulse source output waveform is a double exponential wave voltage pulse with a leading edge not slower than 2ns and a pulse width not less than 30ns, and the sum of the output voltage peaks is U Vertical distance from the front wire grid end and the ground plane h The ratio relationship is:

[0051] like Figure 1-Figure 5 As shown, an embodiment of the present invention discloses a large-scale electromagnetic pulse directional radiation system with an inflatable support structure, which includes three parts: a directional radiation wire antenna, an inflatable support structure and a high-voltage pulse source 8.

[0052] (1) Directional radiation wire antenna The directional radiating wire antenna includes a front transition plate 1, a front wire grid 2, an upper curled edge wire grid 3, a horizontal loading circuit wire grid 4, a vertical loading circuit 5, a load resistor 6, and a ground plate 7. The inflatable support structure includes a left support column airbag 9, a right support column airbag 10, a top flat airbag 11, an end cylindrical airbag 12, a counterweight 13, and a pull rope 14.

[0053] Directional radiating wire antennas such as Figure 3 and Figure 4 As shown, the front transition plate 1, the front wire grid 2, the upper curling wire grid 3, the horizontal loading circuit wire grid 4, the vertical loading circuit 5, the load resistor 6 and the ground plate 7 are a bilaterally symmetrical structure.

[0054] like Figure 4 As shown, the input end of the front transition plate 1 is connected to the output electrode of the high-voltage pulse source 8, the front transition plate 1 is connected to the front wire grid 2, the horizontal loading loop wire grid 4 is connected to several load resistors 6 through several vertical loading loops 5, and the load resistors 6 are connected to the ground plate 7.

[0055] like Figure 3 As shown, each wire in the front wire grid 2, the upper curling wire grid 3, and the horizontal loading loop wire grid 4 is an independent whole conductive metal wire. The wires are aligned and kept equidistant, and the wires are kept taut to reduce high-frequency losses caused by uneven distribution of the wires.

[0056] Furthermore, the number of vertical loading loops is equal to the number of load resistors, which are arranged at equal intervals. The number of load resistors is no less than 6, and the parallel resistance of the load resistors is approximately equal to the characteristic impedance of the directional radiating wire antenna, in order to reduce end reflections and form a matching loading loop.

[0057] Furthermore, the plane where the front wire grid is located is in the same plane as the front transition plate, in order to avoid high-frequency loss caused by structural mutation.

[0058] Furthermore, the angle between the plane where the front wire grid is located and the horizontal plane is not greater than 45 degrees, and the ratio of the width of the front wire grid to the vertical distance between the end of the front wire grid and the ground plate is not greater than 2, in order to ensure that the antenna has a higher impedance to generate a radiation field waveform with a fast front.

[0059] like Figure 6 As shown, the directional radiation wire antenna forms a magnetic dipole after power is applied. and electric dipole Magnetic dipole After the load is applied to the end of the antenna, the current on the front transition plate 1, the front wire grid 2, the upper curling wire grid 3, the horizontal loading loop wire grid 4, the vertical loading loop 5 and the load resistor 6 is formed. , formed by the front transition plate 1, the front wire grid 2, and the upper curling wire grid 3 collecting charges.

[0060] electric dipole The electric field generated is: (1) magnetic dipole The electric field generated is: (2) In the formula c is the speed of light, r is the radius vector, Radius vector r The unit vector of . ε 0 is the dielectric constant of vacuum. R is the total value of the load resistance.

[0061] make and The angle is θ ,but, (3) when ,and and In the same direction, ,and and Maximum. That is, along direction, and In the same direction, the composite field of the electromagnetic combination oscillator is the largest.

[0062] when and In reverse, ,Right now and Inversely, if (4) At this time, the composite field of the electromagnetic combination oscillator is 0, that is, along In the negative direction, the radiation field is 0.

[0063] Based on the above analysis, for the electromagnetic composite oscillator, when the electric dipole and the magnetic dipole satisfy equation (4), The radiation field in the direction of the magnetic dipole is the strongest, while the radiation field in the opposite direction is 0. and electric dipole At the same time, the vertical electric field strength of the outward-facing portion of the directional radiation pull-wire antenna is enhanced, so that the radiation performance of the directional radiation pull-wire antenna is significantly enhanced.

[0064] The calculation formula for the electric dipole moment of a directional radiation wire antenna in the low frequency band is: (5) In the formula Q is the charge,V Apply voltage to the high voltage pulse source, C a is the low-frequency equivalent capacitance of the directional radiation wire antenna, h is the vertical distance between the end of the front wire grid 2 and the ground plate 7, is the unit direction vector.

[0065] For horn antennas with small opening angles, such as directional radiation wire antennas, (6) (7) (8) Where, Z c is the characteristic impedance of the directional radiation wire antenna, Z 0 is the vacuum wave impedance, l It is the horizontal length from the end of the front wire grid 2 to the entrance of the front transition plate 1.

[0066] For a directional radiation wire antenna, the calculation formula for its magnetic dipole is: (9) (10) Where, is the unit direction vector, R is the total value of the load resistance, I is the current flowing through the loading circuit, S It is the total lateral area of the directional radiation wire antenna.

[0067] Substituting the calculation formulas of electric dipole moment and magnetic dipole moment obtained from the above formulas, we can get the conditions that need to be met to improve the radiation performance of the directional radiation wire antenna, that is, (11) When the load resistance matches the antenna characteristic impedance, the radiation performance of the directional radiation wire grid antenna can be improved by satisfying the following relationship: (12) Where: S is the total lateral area of the directional radiation wire antenna; Z 0 is the vacuum wave impedance; ε 0 is the dielectric constant of vacuum; c is the speed of light; h It is the vertical distance between the end of the front wire grid 2 and the ground plate 7.

[0068] (2) Inflatable support structure like Figure 1 、 Figure 2As shown, the inflatable support structure includes a left support column airbag 9, a right support column airbag 10, a top flat airbag 11, an end cylindrical airbag 12, a counterweight 13 and a pull rope 14. The left support column airbag 9 and the right support column airbag 10 are connected to both sides of the top flat airbag 11, and the end cylindrical airbag 12 is connected to the top flat airbag 11. The air pressure of each airbag is independently controlled. After inflation, the left support column airbag 9 and the right support column airbag 10 utilize the gas pressure characteristics to have a certain rigidity, thereby supporting the top flat airbag 11 to form a stable support structure. Several counterweights 13 are set on the ground on both sides and connected to each airbag through a pull rope 14 to play a role in fixing and preventing shaking.

[0069] like Figure 1 As shown, the top flat airbag 11 and the end cylindrical airbag 12 support the wire grid shape. The upper curled wire grid 3 of the directional radiation wire antenna is fixed to the surface of the end cylindrical airbag 12, and the horizontal loading loop wire grid 4 is fixed to the upper surface of the top flat airbag 11.

[0070] Furthermore, the left support column airbag 9, the right support column airbag 10, the top flat airbag 11, and the end cylindrical airbag 12 are made of PVC material, which is airtight and can withstand working pressure. The use of this insulating material avoids affecting the waveform of the electric field generated by the directional radiation system.

[0071] Furthermore, the left support column airbag 9, the right support column airbag 10, the top flat airbag 11, and the end cylindrical airbag 12 are inflated by an air pump, and the inflated gas is air.

[0072] Furthermore, the total number of counterweights 13 is not less than 6, symmetrically distributed on both sides, and the total weight is not less than 2 tons.

[0073] Preferably, the left support column airbag 9 and the right support column airbag 10 have a pressure of several kPa in order to have a certain supporting strength.

[0074] Preferably, the top flat airbag 11 has a pressure of several tens of kPa, in order to ensure the strength and flatness of the top flat airbag 11 .

[0075] Preferably, there is a pressure of several kPa in the end cylindrical airbag 12, so as to ensure that the curled wire grid 3 on the antenna fixed on the surface of the end cylindrical airbag 12 has an arc shape.

[0076] Preferably, the pull rope 14 is made of nylon rope in order to avoid introducing metal materials so as to avoid affecting the waveform of the electric field generated by the directional radiation system.

[0077] Preferably, a plurality of holes are left on the sides of the left support column airbag 9 and the right support column airbag 10 in order to reduce the impact force caused by the side wind.

[0078] (3) High voltage pulse source The high-voltage pulse source 8 is installed between the ground plate 7 and the front transition plate 1. When in operation, the high-voltage pulse source 8 generates a pulse high voltage on the output electrode 15.

[0079] Furthermore, the casing of the high-voltage pulse source 8 is made of non-metallic materials, such as fiberglass, nylon, etc., in order to improve the insulation capacity and reduce the weight of the pulse source.

[0080] Furthermore, the high voltage pulse source 8 is internally insulated with gas insulated material in order to reduce weight.

[0081] Preferably, the high voltage pulse source 8 outputs a double exponential wave voltage pulse with a leading edge no slower than 2ns and a pulse width no less than 30ns, and the sum of the output voltage peaks is U Vertical distance from the end of the front wire grid 2 and the ground plate 7 h The ratio relationship is:

[0082] Examples of dimensional parameters in the embodiments of the invention In the embodiment of the present invention, Figures 1-4 As shown, the front transition plate 1 is 2m long, 1.6m wide and 1m high; the front wire grid 2, the upper curling wire grid 3 and the horizontal loading circuit wire grid 4 are composed of 20 taut flat copper strip braided wires with a cross-sectional area of 20 square millimeters, and the width at the mouth is 8m. The vertical distance between the end of the front wire grid 2 and the ground plate 7 is h 5m, the vertical distance between the horizontal loading circuit line and the ground plate is 7 d 7m, the horizontal length from the end of the front wire grid 2 to the entrance of the front transition plate 1 l is 10m.

[0083] The vertical loading loop 5 consists of 6 taut flat copper braided wires with a cross-sectional area of 20 square millimeters.

[0084] The load resistor 6 includes 6 resistors, each with a resistance of 660Ω and a withstand voltage exceeding 500kV. The parallel resistance is 110Ω, which is the characteristic impedance of the antenna.

[0085] like Figure 1 、 Figure 2 As shown, the left and right support column airbags 9 and 10 are 7m tall, 10m long, 2m wide at the bottom, and 1m wide at the top. The top flat airbag 11 is 0.5m thick, 12m long, and 10m wide. The end cylindrical airbags 12 are 2m in diameter and 10m wide.

[0086] The left and right support column airbags 9 and 10 are connected to the top flat airbag 11 on both sides, and the end cylindrical airbags 12 are connected to the top flat airbag 11. The air pressure of each airbag 9-12 is independently controlled. After inflation, the left and right support column airbags 9 and 10 utilize the characteristics of gas pressure to impart a certain degree of rigidity, thereby supporting the top flat airbag 11 and forming a stable support structure. Ten counterweights 13 are placed on the ground on both sides and connected to the airbags 9-12 via ten pull ropes 14 to stabilize and prevent shaking.

[0087] The left support column airbag 9, the right support column airbag 10, the top flat airbag 11 and the end cylindrical airbag 12 are made of PVC material, have airtightness, and are inflated by an air pump, and the inflated gas is air.

[0088] The total number of counterweights 13 is 10, which are symmetrically distributed on both sides, and the total weight is 2 tons.

[0089] The pressure in the left support column airbag 9 and the right support column airbag 10 is 4-6 kPa, the purpose of which is to have a certain supporting strength.

[0090] The top flat airbag 11 has a pressure of 30-40 kPa in order to ensure the strength and flatness of the top flat airbag 11 .

[0091] The pressure in the end cylindrical airbag 12 is 1.5-2 kPa, so as to ensure that the curled wire grid 3 on the antenna fixed on the surface of the end cylindrical airbag 12 has an arc shape.

[0092] The pull rope 14 is made of a nylon rope with a diameter of 1 cm. The purpose is to avoid introducing metal materials to avoid affecting the waveform of the electric field generated by the directional radiation system, and to have sufficient tensile strength.

[0093] 10m is left on each side of the left support column airbag 9 and the right support column airbag 10 2 The purpose of the cavity is to reduce the impact of side wind.

[0094] In this embodiment of the present invention, the high-voltage pulse source 8 is capable of generating high-voltage pulses with nanosecond leading edges. It is mounted between the ground plate 7 and the front transition plate 1. During operation, the high-voltage pulse source 8 outputs a bi-exponential voltage wave with a peak voltage of 500 kV, a pulse width of 32 ns, and a leading edge of 1.5 ns at the output electrode 15. The outer shell of the high-voltage pulse source 8 is made of fiberglass to improve insulation and reduce weight. The interior of the high-voltage pulse source 8 is insulated with sulfur hexafluoride to reduce weight.

[0095] In this embodiment of the present invention, an electromagnetic pulse radiation environment that complies with the GJB8848 standard can be generated within the working area of a large-scale electromagnetic pulse directional radiation system, namely, the electric field waveform front does not exceed 3ns, the pulse width is 23±5ns, and the peak field strength is not less than 50kV / m. The working area is located below the surface of the wire antenna, is 5m long, 6m wide, and 4m high, and the total working area volume is 120m 3 , which can be used to conduct on-site electromagnetic pulse radiation vulnerability testing for large equipment.

[0096] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Those skilled in the art will readily appreciate that various modifications and variations of the present invention are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. A large electromagnetic pulse directional radiation system with an inflatable support structure, characterized in that: The invention comprises a directional radiation pull-wire antenna, an inflatable support structure and a high-voltage pulse source (8); the inflatable support structure supports and fixes the directional radiation pull-wire antenna, the directional radiation pull-wire antenna comprises a ground plate (7), the high-voltage pulse source (8) is arranged on the ground plate (7), the high-voltage pulse source (8) is connected to a front transition plate (1), the front transition plate (1) is sequentially connected to a front wire grid (2), an upper curling wire grid (3), a horizontal loading circuit wire grid (4), a vertical loading circuit (5) and a load resistor (6), and the load resistor (6) is connected to the ground plate (7).

2. A large electromagnetic pulse directional radiation system with an inflatable support structure according to claim 1, characterized in that: The front wire grid (2), the upper curling wire grid (3), the horizontal loading loop wire grid (4) and the vertical loading loop (5) are all composed of a plurality of conductive metal wires, and the number of the vertical loading loop (5) is the same as that of the load resistors (6), and the load resistors (6) are arranged on the ground plate (7) at equal intervals along a straight line.

3. The large-scale electromagnetic pulse directional radiation system with an inflatable support structure according to claim 2, characterized in that: Each tension wire in the front wire grid (2), the upper curling wire grid (3), and the horizontal loading circuit wire grid (4) is an independent whole conductive metal wire, the conductive metal wires are aligned and kept equidistant, and the conductive metal wires are kept taut.

4. The large-scale electromagnetic pulse directional radiation system with an inflatable support structure according to claim 1, characterized in that: The plane where the front wire grid (2) is located is in the same plane as the front transition plate (1), and the angle between the plane where the front wire grid (2) is located and the horizontal plane is not greater than 45 degrees.

5. The large-scale electromagnetic pulse directional radiation system with an inflatable support structure according to claim 1, characterized in that: The dimensions of the directional radiation wire antenna satisfy the following formula: Where: S is the total lateral area of the directional radiation wire antenna; Z 0 is the vacuum wave impedance; ε 0 is the dielectric constant of vacuum; c is the speed of light; l It is the horizontal length from the end of the front wire grid to the entrance of the front transition plate; h is the vertical distance between the end of the front wire grid and the ground plane.

6. The large-scale electromagnetic pulse directional radiation system with an inflatable support structure according to claim 1, characterized in that: The inflatable support structure comprises a left support column airbag (9) and a right support column airbag (10), the bottom ends of the left support column airbag (9) and the right support column airbag (10) are arranged on the ground plate (7), and a top flat airbag (11) is fixed on the top end. An end cylindrical airbag (12) is fixed on the side of the top flat airbag (11) adjacent to the right support column airbag (10) for supporting and fixing the upper curling wire grid (3), and a plurality of counterweights (13) are respectively arranged on the bottom surfaces of both sides of the left support column airbag (9) and the right support column airbag (10), and the counterweights (13) are connected to the left support column airbag (9), the right support column airbag (10), the top flat airbag (11), and the end cylindrical airbag (12) through a pull rope (14), and a horizontal loading circuit wire grid (4) is fixed on the upper surface of the top flat airbag (11).

7. The large-scale electromagnetic pulse directional radiation system with an inflatable support structure according to claim 6, characterized in that: A plurality of holes are provided on the left support column airbag (9) and the right support column airbag (10).

8. The large-scale electromagnetic pulse directional radiation system with an inflatable support structure according to claim 1, characterized in that: When the high-voltage pulse source (8) is working, a pulse high voltage is generated on the output electrode 15 thereon.

9. The large-scale electromagnetic pulse directional radiation system with an inflatable support structure according to claim 1, characterized in that: The output waveform of the high-voltage pulse source (8) is a double exponential wave voltage pulse with a leading edge not slower than 2ns and a pulse width not less than 30ns, and the sum of the output voltage peaks U Vertical distance from the end of the front wire grid (2) and the ground plate (7) h The ratio relationship is: 。 10. The large electromagnetic pulse directional radiation system with an inflatable support structure according to claim 1, characterized in that One end of the front wire grid (2) connected to the upper curling wire grid (3) is the front wire grid end, and the ratio of the width of the front wire grid end to the vertical distance from the front wire grid end to the grounding plate (7) is not greater than 2.

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