DE102022001764B3 - Fishing net for a drone - Google Patents

Abstract

With a new catch net, the radio communications of the drone should be prevented while maintaining good drone catch properties. This is achieved by the features: a) the safety net comprises a net (10), b) the net (10) has threads (20) which are connected to one another at nodes (30), the distance between two nodes (30) corresponds to a mesh size (m),c) the threads (20) have fibers (40),d) at least 20% by number of the fibers (40) of the threads (20) are electrically conductive fibers (41),e) the mesh size (m) of the net is 0.1 to 1.5 cm,f) the electrically conductive fibers (41) are predominantly fibers (41) selected by weight from a group containing metal fibers (42), carbon fibers and fibers (44) having a plastic filament (44a) and a conductive coating (44b) applied thereto, g) 20 to 80 % by number of the fibers (40) of the thread (20) of the net (10) are non-conductive reinforcement filaments (46), h) the plastic filaments (44a) consist predominantly of polyamide and/or polyester by weight,i) the reinforcing filaments (46) consist predominantly of polyamide and/or polyester by weight.

Description

From the U.S. 2017/0356726 A1 a safety net for a drone is known. The net is ejected by a net launcher. If an enemy drone is surrounded by a previously deployed net, the rotors get caught in the net and the drone to be fought falls to the ground. However, the enemy drone can still receive control, telemetry and navigation signals and even send image and sound information to its pilot at their base station. It is dangerous when the drone to be attacked carries a remote-controlled explosive device that can be triggered by the pilot of the base station, causing major damage.

From the U.S. 10,239,637 B2 a rigid catch basket for a drone is known. The capture basket has a shielding layer material so that a captured drone can neither receive radio signals nor transmit radio signals to its drone base station. This means that explosive devices that can be triggered remotely can no longer be triggered.

From the US 2018 / 0 335 779 A1 a safety net for a drone is known. The fishing net includes a net. To achieve shielding, the safety net can be designed as a wire mesh.

From the US 2019 / 0 063 881 A1 an air defense system with a safety net for a drone is known.

From the CN 2 05 602 150 U an interception system for a drone using a safety net is known. The safety net is transported with a projectile. The mesh size of the net is 50 cm in the exemplary embodiment. The mesh size is so large because only the propeller of a drone to be intercepted should be caught in the safety net in order to bring the drone down. The fishing net includes a net. The net has threads. The filaments have polyethylene fibres, carbon fibers and metal fibers in a mass ratio of 10:2:1. The document states that the electrically conductive fibers serve to generate an electromagnetic induction pulse when the projectile is fired.

Furthermore, bed canopies made of a knitted fabric that is permeable to light and air and shields high frequency are known.

The invention is based on the object of further developing a catching net in such a way that radio communications by the drone are prevented while maintaining good drone catching properties.

This object is achieved according to the invention by the features of claim 1.

There is no shielding layer material, as from the U.S. 10,239,637 B2 known, used. Rather, shielding is achieved in that at least 20% of the fibers, based on the number of fibers in the threads of the network, are electrically conductive fibers, and in that the mesh size of the network is 0.1 to 1.5 cm. Due to this close-meshed arrangement of the electrically conductive fibers, even electromagnetic waves in the low GHz range are shielded.

The electrically conductive fibers are predominantly fibers selected by weight from a group containing metal fibers, carbon fibers and fibers with a plastic filament and a conductive coating applied thereto.

20 to 80% by number of the fibers of a thread of the net are non-conductive reinforcing filaments. This emphasizes the high mechanical demands placed on the safety net, since the rotors of the drones to be attacked have to be blocked.

In terms of weight, the plastic filaments consist mainly of polyamide and/or polyester, because these plastics are very tear-resistant and stable.

Likewise, for reasons of high tear resistance and stability, the weight-related reinforcement filaments consist predominantly of polyamide and/or polyester.

• 1 einen Ausschnitt eines Netzes eines Fangnetzes einer Drohne, wobei Fäden an Knotenpunkten miteinander verbunden sind, in einer Draufsicht.
• 2 einen bereits in 1 gezeigten Faden, in einer perspektivischen Einzeldarstellung im Schnitt.

Exemplary embodiments of the invention are explained in more detail below with reference to the drawings. In each case, highly simplified principle sketches show:

• 1 a section of a net of a fishing net of a drone, with threads being connected to each other at nodes, in a plan view.
• 2 one already in 1 thread shown, in a perspective individual representation in section.

The 1 shows a net 10 of a fishing net. The network 10 has threads 20 which are connected to one another at nodes 30, the distance between two nodes 30 corresponding to a mesh size m.

The 2 shows that a thread 20 has individual fibers 40 . For technical reasons, the number of fibers shown is clear less than the real number. At least 20% by number of the fibers 40 of the thread 20 are electrically conductive fibers 41. The mesh size m of the network is 0.1 to 1.5 cm. With the two aforementioned features, all radio traffic is prevented both to the enemy drone and from the drone to your base station. The specified narrow mesh size m prevents radio traffic in the GHz range. Remotely triggerable explosive charges that an enemy drone may be carrying can no longer be triggered from the base station.

The electrically conductive fibers 41 are predominantly fibers 40 by weight selected from a group containing metal fibers 42, carbon fibers and fibers 44 having a plastic filament 44a and a conductive coating 44b applied thereto. In the illustrated embodiment, no carbon fibers are used. Deviating from the exemplary embodiment shown, the metal fibers 42 could alternatively be replaced by carbon fibers, for example. 20 to 80% by number of the fibers 40 of the thread 20 of the net 10 are non-conductive reinforcement filaments 46, since the catch net must also have high mechanical stability in order to be able to block the rotors of an enemy drone.

The plastic filaments 44a and the reinforcement filaments 46 consist mainly of proven and tear-resistant polyamide and/or polyester, based on their weight.

Reference List

10

network

20

thread

30

node

40

fibers in general

42

metal fibers

44

fiber

44a

plastic filament to be coated

44b

conductive coating

46

reinforcement filament

Claims (1)

Safety net for a drone, with the features: a) the safety net comprises a net (10), b) the net (10) has threads (20) which are connected to one another at nodes (30), the distance between two nodes (30) corresponding to a mesh size (m), c) the threads (20) have fibers (40), d) at least 20% by number of the fibers (40) of the threads (20) are electrically conductive fibers (41), e) the mesh size (m) of the net is 0.1 to 1.5 cm, f) the electrically conductive fibers (41) are predominantly fibers (41) by weight selected from a group containing metal fibers (42), carbon fibers and fibers (44) having a plastic filament (44a) and a conductive coating (44b) applied thereto, g) 20 to 80% by number of the fibers (40) of the thread (20) of the net (10) are non-conductive reinforcing filaments (46), h) the plastic filaments (44a) consist predominantly of polyamide and/or polyester in terms of weight, i) the reinforcement filaments (46) consist predominantly of polyamide and/or polyester in terms of weight.

Images