Counter UAV drone system using electromagnetic pulse

Abstract

In general, the present invention is directed to airborne security measures and more specifically to a device and method to defeat in total a plurality of approaching Unmanned Aerial Vehicles (UAVs) with a single sacrificial intercepting drone. In a preferred embodiment of the invention the intercepting drone may be configured with an attached Electro-Magnetic Pulse (EMP) generation device capable of producing a sufficiently intense EMP burst to completely disable all approaching UAVs.

Claims

1. An electro-magnetic device comprising; a central coaxial cylindrical shell acting electrically as a conducting armature filled with explosive material; an outer coaxial cylindrical shell closed on both the proximal and distal ends that encapsulates the said central coaxial cylindrical shell; a cavity between the central coaxial cylindrical shell and the said outer coaxial cylindrical shell filled with ionized gas molecules; an electrically conducting coil winding along and adhered to the inner surface of the outer coaxial cylindrical shell acting electrically as stator windings; a power supply negative terminal connected to the proximal end of the conducting stator winding and a positive terminal connected to the proximal end of the conducting armature; an electrical resistive load which establishes a current pathway from the distal output of the conducting stator windings to the distal end of the conducting armature thereby establishing a conduction pathway from the power supply through the stator to the load, back through the armature to the power supply closing the loop; a hardened material in mechanical communication with the proximal end of the said outer coaxial cylindrical shell capable of surviving intact the explosion of the said explosive material; and a means to detonate the explosive material.

2. The device of claim 1 wherein the said outer coaxial cylindrical shell may be segmented along its cylindrical outer surface wherein the proximal end of the said hardened material may withstand intact the detonation of the explosive material and the distal end may be designed to disintegrate under pressure from the explosion of the explosive material.

3. The device of claim 1 wherein prior to detonating the explosive material the said power supply is energized thereby establishing an initial magnetic field oriented in a longitudinal direction throughout the cavity region filled with ionized gas molecules.

4. The device of claim 3 wherein immediately after detonating the explosive material, the explosive force begins deforming the armature surface outwardly toward the stator surface thereby compressing the magnetic field lines and accelerating charged particles in the cavity region along the longitudinal direction toward the distal end of the cavity.

5. The device of claim 4 wherein waiting a time period of 10 milliseconds such that simultaneous with the outwardly deforming armature surface contacting the stator winding, short circuiting the load resistance and maximizing the current available from the power supply through the stator winding thereby increasing the magnetic field strength in the cavity region.

6. The device of claim 5 wherein the charged particles interact with the magnetic field by way of the Lorentz Force given by the vector cross product equation Lorentz Force=Velocity×Magnetic Field Strength, the net result being an additional rapid acceleration of the ionized particles thereby generating an electro-magnetic pulse.

7. The device of claim 6 wherein when the explosive force has propagated a predetermined distance toward the distal end of the outer coaxial cylindrical shell, the outer coaxial shell surface designed to disintegrate under pressure will disintegrate releasing an electromagnetic burst from a compressed time varying magnetic field and an electromagnetic burst from released accelerating ionized gas molecules.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

(1) The invention may be more completely understood in consideration of the following detailed description of various embodiments of the invention in connection with the accompanying drawings, in which:

(2) FIG. 1 shows a schematic representation of one embodiment of the present invention depicting an unmanned aerial vehicle (UAV) with an attached electromagnetic pulse generating device attached to the UAV fuselage.

(3) FIG. 2 shows a cross sectional representation of one embodiment of the present invention depicting the electromagnetic pulse generating device shown in FIG. 1.

(4) FIG. 3 shows a schematic representation of an alternative embodiment of the electromagnetic pulse generating device, wherein the device is configured as an explosively pumped modified flux compression generator.

(5) FIG. 3A depicts the electromagnetic pulse generating device immediately upon detonating the high velocity explosive material, wherein the explosive force begins deforming the armature surface outwardly toward the stator surface.

(6) FIG. 3B depicts the electromagnetic pulse generating device approximately 10 microseconds after detonating the explosive material wherein the outwardly deforming armature surface first contacts the stator windings.

(7) FIG. 3C depicts the electromagnetic pulse generating device when the explosive force has propagated longitudinally a predetermined distance toward the distal end of the device which disintegrates thereby releasing the accelerating ionized gas molecules.

(8) FIG. 3D shows ionized gas molecules releasing an omnidirectional electromagnetic burst from the compressed time varying magnetic field.

(9) FIG. 3E shows an omnidirectional electromagnetic burst from the released rapidly accelerating ionized gas molecules.

(10) While the invention is amenable to various modifications and alternative forms, specifics thereof have been shown by way of example in the drawings and will be described in detail. It should be understood, however, that the intention is not to limit the invention to the particular embodiments described. On the contrary, the intention is to cover all modifications, equivalents, and alternatives falling within the spirit and scope of the invention as defined by the appended claims.

DETAILED DESCRIPTION

(11) In general, the present invention is directed to airborne security measures and more specifically to a device and method to defeat in total a plurality of approaching Unmanned Aerial Vehicles (UAVs) with a single sacrificial intercepting drone. In a preferred embodiment of the invention the intercepting drone may be configured with an attached Electro-Magnetic Pulse (EMP) generating device capable of producing a sufficiently intense EMP burst to completely disable all approaching UAVs.

(12) One embodiment of the present invention is shown in FIG. 1 depicting an unmanned aerial vehicle (UAV) 1 with an Electro-Magnetic Pulse (EMP) generating device 2 attached to the UAV's fuselage region 3. The UAV may be configured with the necessary hardware (not shown) to receive wireless communication commands from a remote pilot to both navigate the UAV and detonate the EMP device.

(13) FIG. 2 shows a cross sectional view of one embodiment of the Electro-Magnetic Pulse (EMP) generating device depicted in FIG. 1. The EMP generating device 4 may be comprised of a centrally located explosive material 5, surface wrapped with a host material 6. The host material 6 may encase charged particles 7 from the family of alkali metals including lithium ions, cesium ions, potassium ions or a combination thereof. One example in the prior art, U.S. Pat. No. 10,088,278 teaches utilizing intercalated graphite as the host material 6 to encase the charged particle 7 ions, and the 278' patent is incorporated herein by reference in its entirety. The centrally located highly explosive material 5 may have an integrated detonator device 8, which may be configured to receive a wireless command from the remote UAV pilot to initiate detonation of the highly explosive material.

(14) Upon detonation, the encased ions 7 may be liberated from their host material 6, and under extreme acceleration may generate an intense Electro-Magnetic Pulse (EMP). Given the spherical geometry of the EMP generating device 4, the radiated EMP pulse may propagate radially outward, and may disable or destroy all incoming UAV's within a certain distance.

(15) A preferred embodiment of the present invention is depicted in FIG. 3, wherein devices of this general configuration have been coined in the technical literature as Flux Compression Generators (FCGs). One such prior art device can be found in U.S. Pat. No. 9,658,026 by inventors Fred Grace et al. The 026' patent teaches a particular configuration of a FCG device configured to explosively generate a linearly propagating highly compressed magnetic field, which in turn can generate enormous electrical currents, the net result of which claims to have the ability to launch an extremely high velocity projectile. However, the goal of the present invention is to generate an omnidirectional, radially expanding high intensity electromagnetic pulse as explained earlier.

(16) FIG. 3 shows a cross sectional view of an explosively pumped Flux Compression Generator (FCG) 300 in accordance with the present invention. The main feature of the FCG includes a centrally located high velocity explosive material 302 which is encased in a conducting cylindrical housing which functions as an electrical armature surface 306. Candidate high velocity explosive material may include but are not limited to PETN (Pentaerythritoltetranitrate), TATP, (Triacetone triperoxide), RDX (Cyclotrimethylene trinitramine), and TNT amongst others. The entire device may be surrounded by an outer cylindrical surface of revolution 305 which may have electrically conducting stator windings 304 sequentially wound and adhered to its' inner surface. The outer surface 305 may form an air tight seal for the overall Flux Compression Generator (FCG) 300 with the appropriate air tight through-hole apertures to allow passage of electrical leads into and out of the outer surface 305. Also, the outer surface 305 may have an pneumatic adapter 307 to allow pressurizing the cavity region 308. In a preferred embodiment of the invention, the pneumatic adapter 307 may be utilized to inject ionized lithium gas molecules 310 into the cavity region 308.

(17) The outer surface 305 may be segmented along its cylindrical length such that the proximal end of the said material may withstand intact the detonation of the explosive material and the distal end may be designed to disintegrate under pressure from the explosion.

(18) In operation, an electrical power source 318 negative terminal may be connected to the proximal end of the conducting stator 304 and the positive terminal may be connected to the proximal end of the conducting armature 306 as depicted in FIG. 3. An electrical resistive load 320 may be connected between the distal ends of the conducting stator and armature, thereby establishing a closed loop circuit from the power supply through the stator to the load, back through the armature to the power supply. Prior to detonating the high velocity explosive material, the power supply 318 may be energized thereby establishing an initial nominal magnetic field 322 oriented in a longitudinal direction throughout the cavity region 308 filled with ionized gas molecules 310.

(19) Immediately upon detonating the high velocity explosive material 302, the explosive force begins deforming the armature surface 306 outwardly toward the stator surface 305 as depicted in FIG. 3A, thereby greatly compressing/strengthening the magnetic field lines 322 and rapidly accelerating the ionized gas molecules 320 in the now reduced cavity region 308. Now, waiting approximately 10 milliseconds such that simultaneous with the outwardly deforming armature surface 306 contacting the stator windings 304 as depicted in FIG. 3B, short circuiting the load resistance 320 and maximizing the current available from the power supply 318 through the stator windings 304 thereby increasing the magnetic field strength 322 in the cavity region 308. The now high velocity charged particles 310 interact with the greatly increased magnetic field strength 322 by way of the Lorentz Force given by the vector cross product equation Lorentz Force=Velocity×Magnetic Field Strength, the net result being an additional rapid acceleration of the ionized particles—generating an enormous electro-magnetic pulse possibly in the terawatt regime.

(20) Shortly thereafter (millisecond time frame), when the explosive force has propagated a predetermined distance toward the distal end of the outer coaxial cylindrical shell, designed to disintegrate under radial pressure, the outer shell material will disintegrate as depicted in FIG. 3C, thereby releasing an omnidirectional electromagnetic burst from the compressed time varying magnetic field 322 (FIG. 3D) and an omnidirectional electromagnetic burst from the released rapidly accelerating ionized gas molecules 310 (FIG. 3E).

(21) The present invention should not be considered limited to the particular examples described above, but rather should be understood to cover all aspects of the invention as fairly set out in the attached claims. Various modifications, equivalent processes, as well as numerous structures to which the present invention may be applicable will be readily apparent to those of skill in the art to which the present invention is directed upon review of the present specification. The claims are intended to cover such modifications and devices.