CN107395317B - Electromagnetic interference gun - Google Patents
Electromagnetic interference gun Download PDFInfo
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- CN107395317B CN107395317B CN201710806589.8A CN201710806589A CN107395317B CN 107395317 B CN107395317 B CN 107395317B CN 201710806589 A CN201710806589 A CN 201710806589A CN 107395317 B CN107395317 B CN 107395317B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04K—SECRET COMMUNICATION; JAMMING OF COMMUNICATION
- H04K3/00—Jamming of communication; Counter-measures
- H04K3/80—Jamming or countermeasure characterized by its function
- H04K3/90—Jamming or countermeasure characterized by its function related to allowing or preventing navigation or positioning, e.g. GPS
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04K—SECRET COMMUNICATION; JAMMING OF COMMUNICATION
- H04K3/00—Jamming of communication; Counter-measures
- H04K3/60—Jamming involving special techniques
- H04K3/62—Jamming involving special techniques by exposing communication, processing or storing systems to electromagnetic wave radiation, e.g. causing disturbance, disruption or damage of electronic circuits, or causing external injection of faults in the information
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D30/00—Reducing energy consumption in communication networks
- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
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- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Radar, Positioning & Navigation (AREA)
- Remote Sensing (AREA)
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Radar Systems Or Details Thereof (AREA)
- Variable-Direction Aerials And Aerial Arrays (AREA)
Abstract
The invention provides an electromagnetic interference gun, and relates to the field of electromagnetic interference. This electromagnetic interference rifle passes through the host computer module and is connected and integrated design with battery module, antenna module electricity respectively through two interfaces to need not to carry battery module on the back of operating personnel, also need not to provide the antenna module of a plurality of frequency channels, thereby make electromagnetic interference rifle's installation, maintenance and simple to use, and be favorable to operating personnel to carry, be convenient for maintain, operating personnel operation experience is felt highly, and low in manufacturing cost.
Description
Technical Field
The invention relates to the field of electromagnetic interference, in particular to an electromagnetic interference gun.
Background
Unmanned aerial vehicles are popular in civil markets at present, but lack of effective control, and cause great trouble and even safety accidents for security work in some airports, large conferences and sporting events. Therefore, people often utilize an anti-unmanned aerial vehicle gun to control the use of the unmanned aerial vehicle. The anti-unmanned aerial vehicle gun is an interference gun, actually is an anti-unmanned aerial vehicle electromagnetic gun, the appearance is similar to a rifle, the gun body is an electromagnetic pulse emitter, the gun barrel is also a transmitting antenna (a lot of are spiral), and the concrete working principle is that after the anti-unmanned aerial vehicle gun (anti-unmanned aerial vehicle interference gun) (anti-unmanned aerial vehicle electromagnetic gun) aims at the unmanned aerial vehicle, a beam of electromagnetic pulse interference waves with high power are emitted to interfere with an electronic system of the unmanned aerial vehicle, so that the unmanned aerial vehicle communication navigation system is out of order, the control is lost, and then the ground is dropped or even crashed.
The battery of electromagnetic interference rifle among the prior art adopts knapsack formula battery, needs to carry on operating personnel's back to the antenna sets up discretely, and the circuit chip that needs is more, and the structure is more scattered complicated, is unfavorable for operating personnel to carry, and operating personnel operation experience feels poor, and because the circuit chip that needs is more leads to manufacturing cost higher.
Disclosure of Invention
The present invention aims to provide an electromagnetic interference gun which aims to improve the existing problems.
The embodiment of the invention provides an electromagnetic interference gun, which comprises a host module, a battery module and an antenna module, wherein the host module comprises an interface, and the host module is respectively and electrically connected with the battery module and the antenna module through two interfaces and is integrally designed.
Further, the electromagnetic interference gun further comprises a spread spectrum module, the spread spectrum module is detachably connected with the host module through an interface, and when the spread spectrum module is in a connection state with one of the interfaces, the spread spectrum module is electrically connected with the control and excitation sub-module.
Further, the host module comprises a control and excitation sub-module and a power amplification sub-module, and the battery module is electrically connected with the control and excitation sub-module, the power amplification sub-module and the antenna module in sequence.
Further, the electromagnetic interference gun further comprises a combining Lu Qizi module, the antenna module is a three-frequency antenna module combining three frequencies, the power amplification submodule comprises a first power amplification submodule and a second power amplification submodule, the control and excitation submodule, the first power amplification submodule, the combining Lu Qizi module and the three-frequency antenna module are sequentially and electrically connected, and the control and excitation submodule, the second power amplification submodule, the combining Lu Qizi module and the three-frequency antenna module are sequentially and electrically connected.
Further, a voltage stabilizing sub-module is further arranged in the shell, and the battery module, the voltage stabilizing sub-module and the control and excitation sub-module are electrically connected in sequence.
Further, a heat dissipation sub-module is further arranged in the shell and is electrically connected with the voltage stabilizing sub-module, the first power amplification sub-module and the second power amplification sub-module are arranged at intervals and are provided with heat dissipation channels, and the positions of the heat dissipation sub-modules correspond to the heat dissipation channels.
Further, the heat dissipation submodule is positioned between the voltage stabilizing submodule, the control and excitation submodule, the first power amplification submodule and the second power amplification submodule.
Further, the host module further comprises a GPS positioning sub-module, the control and excitation sub-module is electrically connected with the GPS positioning sub-module, and the GPS positioning sub-module is used for collecting current position information.
Further, the host module further comprises an electronic compass, the control and excitation sub-module is electrically connected with the electronic compass, and the control and excitation sub-module is used for controlling the electronic compass to collect the emitting direction of the interference signal when the electromagnetic interference gun is in a working state.
Further, the host module further comprises a 3D gravity meter, the control and excitation sub-module is electrically connected with the 3D gravity meter, and the control and excitation sub-module is used for controlling the 3D gravity meter to collect an interference signal and a transmitting angle of a horizontal plane when the electromagnetic interference gun is in a working state.
The electromagnetic interference gun provided by the invention has the beneficial effects that: this electromagnetic interference rifle passes through the host computer module and is connected and integrated design with battery module, antenna module electricity respectively through two interfaces to need not to carry battery module on the back of operating personnel, also need not to provide the antenna module of a plurality of frequency channels, thereby make electromagnetic interference rifle's installation, maintenance and simple to use, and be favorable to operating personnel to carry, be convenient for maintain, operating personnel operation experience is felt highly, and low in manufacturing cost.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are needed in the embodiments will be briefly described below, it being understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and other related drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic structural diagram of an electromagnetic interference gun according to an embodiment of the present invention;
FIG. 2 is a block diagram of an electromagnetic interference gun according to an embodiment of the present invention;
fig. 3 is a circuit connection block diagram of an electromagnetic interference gun according to an embodiment of the present invention.
Icon: 101-a housing; 102-a battery module; 103-an antenna module; 104-a control and excitation sub-module; 105-a first power amplifier sub-module; 106-a second power amplifier sub-module; 107-in Lu Qizi module; 108-a heat dissipation sub-module; 109-spread spectrum module; 110-a voltage stabilizing sub-module; a 111-GPS positioning sub-module; 112-a switch sub-module; 113-a host module; 114-an electronic compass; 115-3D gravity gauge; 116-heat dissipation channels.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments of the present invention. The components of the embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the invention, as presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
It should be noted that: like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further definition or explanation thereof is necessary in the following figures.
In the description of the present invention, it should be understood that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," "outer," and the like indicate orientations or positional relationships based on those shown in the drawings, or those conventionally put in place when the inventive product is used, or those conventionally understood by those skilled in the art, merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the apparatus or element to be referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present invention.
Furthermore, the terms "first," "second," "third," and the like are used merely to distinguish between descriptions and should not be construed as indicating or implying relative importance.
In the description of the present invention, it should also be noted that, unless explicitly specified and limited otherwise, the terms "disposed," "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present invention will be understood in specific cases by those of ordinary skill in the art.
Examples
Referring to fig. 1, an electromagnetic interference gun is provided in an embodiment of the present invention, and the electromagnetic interference gun includes a host module 113, a battery module 102 and an antenna module 103. The host module 113, the battery module 102 and the antenna module 103 all comprise a housing 101, the housing 101 of the host module 113 comprises an interface, and the host module 113 is electrically connected with the battery module 102 and the antenna module 103 respectively through two interfaces and is integrally designed. Through host computer module 113 respectively with battery module 102, antenna module 103 electricity is connected and integrated design through two interfaces to need not to carry battery module 102 on the back of the operator, also need not to provide the antenna module of a plurality of frequency channels, thereby make electromagnetic interference rifle's installation, maintenance and use simple, and be favorable to the operating personnel to carry, be convenient for maintain, operating personnel operation experience is felt highly, and low in manufacturing cost.
The host module 113 includes a switch sub-module 112, a control and excitation sub-module 104, and a power amplifier sub-module, and the battery module is electrically connected to the control and excitation sub-module 104, the power amplifier sub-module, and the antenna module 105 in sequence. The switch module 112 may be a wrench of the interference gun for generating an opening command in response to a user operation; the control and excitation sub-module 104 integrates the functions of a controller and a signal generation module, the control and excitation sub-module 104 is used for generating an electromagnetic wave interference signal after receiving an opening instruction and authorizing, the power amplification module is used for amplifying the electromagnetic wave interference signal, and the antenna module 103 is used for transmitting the interference signal to a target position.
In this embodiment, the controller may be an integrated circuit chip with signal processing capability. The controller may be a general-purpose processor, including a central processing unit (Central Processing Unit, CPU for short), a network processor (Network Processor, NP for short), etc.; but may also be a Digital Signal Processor (DSP), application Specific Integrated Circuit (ASIC), an off-the-shelf programmable gate array (FPGA) or other programmable logic device, discrete gate or transistor logic device, discrete hardware components. The disclosed methods, steps, and logic blocks in the embodiments of the present invention may be implemented or performed. A general purpose processor may be a microprocessor or the processor may be any conventional processor or the like.
Preferably, the electromagnetic interference gun further comprises a combining Lu Qizi module 107, the antenna module 103 is a three-frequency antenna module combining three frequencies, the power amplification submodule comprises a first power amplification submodule 105, a second power amplification submodule 106, the control and excitation submodule 104, the first power amplification submodule 105, the combining Lu Qizi module 107 and the three-frequency antenna module are electrically connected in sequence, and the control and excitation submodule 104 is electrically connected with the second power amplification submodule 106, the combining Lu Qizi module 107 and the three-frequency antenna module in sequence. In this embodiment, the first power amplifier submodule 105 may be, but not limited to, a power amplifier submodule of 1.6GHZ and 2.4GHZ, and the first power amplifier submodule 105 may be, but not limited to, a power amplifier submodule of 5.8 GHZ. The three-frequency antenna module and the battery module 102 are respectively located at two ends of the casing 101, and the three-frequency antenna can transmit and receive electromagnetic wave signals with three fixed frequencies. The three antenna modules 103 of the original three transceiving different frequency bands are integrated into one three-frequency antenna module, so that the occupied volume of the electromagnetic interference gun is reduced, and meanwhile, the cost is saved. The combining Lu Qizi module 107 is used for combining multiple interference signals into one path, and the three-frequency antenna module is used for transmitting the combined interference signals to a target position.
As shown in fig. 2, since the first power amplifier sub-module 105 and the second power amplifier sub-module 106 may emit a large amount of heat during the operation of the electromagnetic interference gun, the electromagnetic interference gun may be damaged after a long period of time, and therefore the host module 113 further includes a heat dissipation sub-module 108, the heat dissipation sub-module 108 is electrically connected with the battery module 102, the first power amplifier sub-module 105 and the second power amplifier sub-module 106 are disposed at intervals and are formed with heat dissipation channels 116, and the positions of the heat dissipation sub-modules 108 correspond to the heat dissipation channels 116. The heat dissipation sub-module 108 can perform air cooling for the first power amplification sub-module 105 and the second power amplification sub-module 106 through the heat dissipation channel 116 in the working process of the electromagnetic interference gun, so that the service life of the electromagnetic interference gun is prolonged, wherein the heat dissipation sub-module 108 can be a fan.
Considering that the electromagnetic interference gun may also utilize signals of other frequency bands to interfere with the target object during use, the host module 113 further includes a spreading module 109, the spreading module 109 is detachably connected to the interface of the host module 113, and when the spreading module 109 is in a connection state with one of the interfaces of the host module 113, the spreading module 109 is electrically connected to the control and excitation sub-module 104. The spreading module 109 may spread the currently transmitted interference signal when it is in a connected state with the host module 113.
A voltage stabilizing sub-module 110 is also disposed within the housing 101, and the battery module 102, the voltage stabilizing sub-module 110, and the control and excitation sub-module 104 are electrically connected in sequence. The voltage stabilizing sub-module 110 can stabilize the voltage output by the battery module 102, thereby ensuring the stability of the output voltage. In addition, the heat dissipation sub-module 108 is located between the voltage stabilizing sub-module 110, the control and excitation sub-module 104, and the first power amplification sub-module 105, the second power amplification sub-module 106.
Considering that the electromagnetic pulse emitted by the operator using the interference gun at some specific positions can also negatively affect the life and normal electromagnetic environment of residents, the host module 113 further comprises a GPS positioning sub-module 111, wherein the GPS positioning sub-module 111 is used for collecting the current position information of the electromagnetic interference gun, and the control and excitation sub-module 104 is electrically connected with the GPS positioning sub-module 111. The control and excitation sub-module 104 is configured to control the GPS positioning sub-module 111 to collect current position information after receiving an on signal sent by the switch module 112 in response to a user operation, and determine whether the current position information is within a preset authority position range. If the current position information is not within the preset authority position range, a forbidden prompt is generated to prompt an operator to forbidden the interference gun at the position, and the interference gun cannot emit an interference signal at the position, so that negative influence on the life and normal electromagnetic environment of residents due to the use of the interference gun is avoided.
Further, considering that the electromagnetic pulse emitted by the operator using the interference gun at some specific time also can negatively affect the life and normal electromagnetic environment of residents, the control and excitation sub-module 104 is further configured to generate a forbidden use prompt if the current position information is not within the preset authority position range or the current time information is not within the preset time authority range, and generate the forbidden use prompt when the current position information does not meet any condition in the preset authority position range and the current time information does not meet any condition in the preset time authority range, so that the use authority of the interference gun for the operator is constrained by using two constraint conditions of time and position.
In addition, the surface of the housing 101 may also be provided with a display module, which is electrically connected to the control and excitation sub-module 104. The display module provides an interactive interface (e.g., a user interface) between the electromagnetic interference gun and the user or is used to display image data to the user for reference. The display module may be a liquid crystal display or a touch display. In the case of a touch display, the touch display may be a capacitive touch screen or a resistive touch screen, etc. supporting single-point and multi-point touch operations. Supporting single-and multi-touch operation refers to a touch display being able to sense one or more locations from the touch display.
In addition, considering that the interference gun may still have negative effects on the life of the resident and the normal electromagnetic environment when working under the condition of conforming to the use authority, the host module 113 further includes an electronic compass 114, and the electronic compass 114 is used for collecting the direction of the interference signal emission, and the control and excitation sub-module 104 is electrically connected with the electronic compass 114. The control and excitation sub-module 104 is configured to control the electronic compass 114 to collect the emission direction of the interference signal when the electromagnetic interference gun is in an operating state. Through recording the transmitting direction, if when the interference gun works under the condition of conforming to the use authority, the interference gun still has possibility of negatively affecting the life of residents and normal electromagnetic environment, and when an operator causes crime suspects or disputes with residents, the security department can call the transmitting direction recorded by the interference gun to perform evidence collection and tracing, so that crime behaviors and disputes can be eliminated or determined.
Further, the host module 113 further includes a 3D gravity meter 115,3D and a gravity meter 115 for collecting the emission angle of the interference signal and the horizontal plane, and the control and excitation sub-module 104 is electrically connected with the 3D gravity meter 115. The control and excitation sub-module 104 is used for controlling the 3D gravity meter 115 to collect the emission angle of the interference signal and the horizontal plane when the electromagnetic interference gun is in an operating state. The security department can also call the emission angle of the interference signal recorded by the interference gun and the horizontal plane to carry out evidence collection and tracing, thereby eliminating or determining criminal behaviors and eliminating disputes. In addition, the use time and the collected geographical position track can also be used as the evidence traced by the security department.
In summary, according to the electromagnetic interference gun provided by the invention, 1, the host module is electrically connected with the battery module and the antenna module through the two interfaces respectively and is designed integrally, so that the battery module is not required to be carried on the back of an operator, and the antenna modules with a plurality of frequency bands are not required to be provided, so that the electromagnetic interference gun is simple to install, maintain and use, is beneficial to carrying by the operator, is convenient to maintain, has high operation experience of the operator, and is low in manufacturing cost. 2. The three antenna modules of the original three transceiving different frequency bands are integrated into the three-frequency antenna module, so that the occupied volume of the shell is reduced, and meanwhile, the cost is saved. 3. The heat dissipation submodule channel can be used for cooling air for the first power amplification submodule and the second power amplification submodule through heat dissipation in the working process of the electromagnetic interference gun, so that the service life of the electromagnetic interference gun is prolonged. 4. And when the spread spectrum module is in a connection state with the shell, spread spectrum can be carried out on the currently transmitted interference signal. 5. If the current position information is not within the preset authority position range or the current time information is not within the preset time authority range, generating a forbidden use prompt, and if the current position information does not meet any condition in the preset authority position range or the current time information does not meet any condition in the preset time authority range, generating the forbidden use prompt, thereby restraining the use authority of an operator for using the interference gun by using two constraint conditions of time and position. 6. If the interference gun works under the condition of conforming to the use authority, when the interference gun still has negative influence on the life of residents and normal electromagnetic environment, and when crime suspects or disputes are caused by the operators, the security department can call the emission direction recorded by the interference gun and the emission angle of the recorded interference signal and the horizontal plane to perform evidence collection and tracing, so that crime behaviors and disputes can be eliminated or determined.
The above description is only of the preferred embodiments of the present invention and is not intended to limit the present invention, but various modifications and variations can be made to the present invention by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (7)
1. The electromagnetic interference gun is characterized by comprising a host module, a battery module and an antenna module, wherein the host module comprises an interface, and the host module is respectively and electrically connected with the battery module and the antenna module through two interfaces and is integrally designed, and the host module, the battery module and the antenna module comprise shells;
the host module comprises a control and excitation sub-module and a power amplification sub-module, and the battery module is electrically connected with the control and excitation sub-module, the power amplification sub-module and the antenna module in sequence;
the electromagnetic interference gun also comprises a spread spectrum module, wherein the spread spectrum module is detachably connected with the host module through an interface, and is electrically connected with the control and excitation sub-module when the spread spectrum module is in a connection state with one of the interfaces;
the host module further comprises an electronic compass, the control and excitation sub-module is electrically connected with the electronic compass, and the control and excitation sub-module is used for controlling the electronic compass to collect the transmitting direction of the interference signal when the electromagnetic interference gun is in a working state.
2. The electromagnetic interference gun of claim 1 further comprising a combining Lu Qizi module, wherein the antenna module is a three-frequency-in-one three-frequency antenna module, the power amplification sub-module comprises a first power amplification sub-module and a second power amplification sub-module, the control and excitation sub-module, the first power amplification sub-module, the combining Lu Qizi module and the three-frequency antenna module are electrically connected in sequence, and the control and excitation sub-module is electrically connected with the second power amplification sub-module, the combining Lu Qizi module and the three-frequency antenna module in sequence.
3. The electromagnetic interference gun of claim 2, wherein a voltage stabilizing sub-module is further disposed within the housing, the battery module, the voltage stabilizing sub-module, and the control and excitation sub-module being electrically connected in sequence.
4. The electromagnetic interference gun according to claim 3, wherein a heat dissipation sub-module is further arranged in the housing, the heat dissipation sub-module is electrically connected with the voltage stabilizing sub-module, the first power amplification sub-module and the second power amplification sub-module are arranged at intervals and are provided with heat dissipation channels, and the positions of the heat dissipation sub-modules correspond to the heat dissipation channels.
5. The emi gun of claim 4 wherein the heat dissipating sub-module is located between the voltage stabilizing sub-module, the control and excitation sub-module, and the first and second power amplifier sub-modules.
6. The electromagnetic interference gun of claim 1, wherein the host module further comprises a GPS positioning sub-module, the control and excitation sub-module being electrically connected to the GPS positioning sub-module, the GPS positioning sub-module being configured to collect current location information.
7. The electromagnetic interference gun of claim 1, wherein the host module further comprises a 3D gravity meter, the control and excitation sub-module being electrically connected to the 3D gravity meter, the control and excitation sub-module being configured to control the 3D gravity meter to collect an interference signal and an emission angle of a horizontal plane when the electromagnetic interference gun is in an operational state.
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| CN201710806589.8A CN107395317B (en) | 2017-09-08 | 2017-09-08 | Electromagnetic interference gun |
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| CN201710806589.8A CN107395317B (en) | 2017-09-08 | 2017-09-08 | Electromagnetic interference gun |
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Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108123198A (en) * | 2017-12-19 | 2018-06-05 | 合肥博雷电气有限公司 | A kind of high-efficiency high power spatial microwave power combining methods |
| CN109039525A (en) * | 2018-06-04 | 2018-12-18 | 成都大公博创信息技术有限公司 | A kind of unmanned aerial vehicle radio disturbance suppression method and system |
| CN108737014A (en) * | 2018-06-21 | 2018-11-02 | 西安胡门网络技术有限公司 | Portable anti-unmanned machine equipment |
| CN109141130A (en) * | 2018-11-08 | 2019-01-04 | 上海振裔航空科技有限公司 | A kind of unmanned plane counter rifle |
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| US7653385B2 (en) * | 2001-01-26 | 2010-01-26 | Arend Brian L | Wireless telecommunications signal inhibition |
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| CN107395317A (en) | 2017-11-24 |
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