CN112511244A - Spectrum detection and directional interference equipment and method - Google Patents
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- 238000001514 detection method Methods 0.000 title claims abstract description 58
- 238000000034 method Methods 0.000 title claims abstract description 22
- 230000001629 suppression Effects 0.000 claims abstract description 9
- 230000008569 process Effects 0.000 claims abstract description 8
- 230000005855 radiation Effects 0.000 claims abstract description 7
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- 238000006243 chemical reaction Methods 0.000 claims description 5
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Abstract
The invention relates to the technical field of unmanned aerial vehicles, and discloses a frequency spectrum detection and directional interference device and a method, which are used for integrating frequency spectrum detection and directional interference functions into the same device and improving the overall performance of linkage. The apparatus comprises: sharing a frequency spectrum detection module and a directional interference module of the same antenna array through a full duplex module; a radio frequency switch is arranged between the frequency spectrum detection module and the full duplex module; the radio frequency switch is controlled by the main control module to dynamically switch the sector scanned by the spectrum detection module; the main control module is also respectively connected with the frequency spectrum detection module and the directional interference module and used for judging whether the current sector has unmanned aerial vehicle signals or not, and if so, the amplitude ratio of the adjacent sectors is selected to accurately determine the coming direction of the unmanned aerial vehicle; then generating a suppression interference radio frequency signal through a directional interference module and executing radio frequency radiation; and in the scanning process of subsequent sector polling, if the antenna scanning radiating the directional interference does not track the unmanned aerial vehicle signal, the interference operation is stopped.
Description
Technical Field
The invention relates to the technical field of unmanned aerial vehicle radio detection and interference, in particular to frequency spectrum detection and directional interference equipment and a method.
Background
At present, the unmanned aerial vehicle industry is developed vigorously, but the problem of unmanned aerial vehicle black flight brings serious threats to the anti-terrorism safety of sensitive key areas. The technical means of discovering unmanned aerial vehicle on the market includes photoelectric radar, radio detection etc. and the means of striking unmanned aerial vehicle includes radio frequency interference, laser strikes etc. but discovery unmanned aerial vehicle's equipment can't be used for striking unmanned aerial vehicle, and the equipment that strikes unmanned aerial vehicle also can't be used for detecting unmanned aerial vehicle, needs a set of detection equipment and a set of striking equipment at least and just can accomplish to survey and strike, causes system cost and maintenance cost all to increase a lot. If one set of equipment can detect and strike, the cost can be reduced, the installation and maintenance can be reduced, and the reliability can be improved.
Patent CN107094062A discloses an antenna array device and a directional interference system of full airspace unmanned aerial vehicle, which utilizes multiple antennas to cover in the whole airspace, has the characteristics of multi-target and zero-delay narrow-beam directional suppression interference, can realize directional interference to multiple batches of multi-directional unmanned aerial vehicles, but also can not be used for detecting and discovering unmanned aerial vehicles.
Disclosure of Invention
The invention mainly aims to disclose a frequency spectrum detection and directional interference device, so that the frequency spectrum detection and directional interference functions are integrated in the same device, and the overall performance of linkage is improved.
To achieve the above object, the present invention discloses a spectrum sensing and directional jamming device, comprising:
sharing a frequency spectrum detection module and a directional interference module of the same antenna array through a full duplex module;
a radio frequency switch is arranged between the frequency spectrum detection module and the full duplex module;
the radio frequency switch is controlled by a main control module to dynamically switch the sector scanned by the spectrum detection module;
the main control module is also respectively connected with the frequency spectrum detection module and the directional interference module and used for determining a scanning sector, judging whether the frequency spectrum type of a signal of the current sector is telemetering of an unmanned aerial vehicle or a picture transmission signal, if so, selecting an adjacent sector for amplitude comparison, and selecting an antenna direction corresponding to a sector with the largest amplitude and the telemetering and picture transmission signals conforming to the signal frequency spectrum characteristics of the unmanned aerial vehicle as the direction of arrival of the unmanned aerial vehicle; then, generating a suppression interference radio frequency signal through the directional interference module, and executing radio frequency radiation to an antenna of the sector through the unmanned aerial vehicle; and in the scanning process of subsequent sector polling, if the antenna scanning radiating the directional interference does not track the unmanned aerial vehicle telemetering or image transmission signal, the directional interference work facing the corresponding sector is stopped.
In order to achieve the above purpose, the invention discloses a frequency spectrum detection and directional interference method, a frequency spectrum detection module and a directional interference module sharing the same antenna array through a full duplex module are deployed in the same equipment, and a radio frequency switch is arranged between the frequency spectrum detection module and the full duplex module; the radio frequency switch is controlled by a main control module to dynamically switch the sector scanned by the spectrum detection module; the main control module is also respectively connected with the frequency spectrum detection module and the directional interference module; the method comprises the following steps:
determining a scanning sector, judging whether the signal spectrum type of the current sector is unmanned aerial vehicle telemetering or image transmission signals, if so, selecting the amplitude of the adjacent sector, and selecting the antenna direction corresponding to the sector with the maximum amplitude and the telemetering and image transmission signals conforming to the signal spectrum characteristics of the unmanned aerial vehicle as the coming direction of the unmanned aerial vehicle; then, generating a suppression interference radio frequency signal through the directional interference module, and executing radio frequency radiation to an antenna of the sector through the unmanned aerial vehicle; and in the scanning process of subsequent sector polling, if the antenna scanning radiating the directional interference does not track the unmanned aerial vehicle telemetering or image transmission signal, the directional interference work facing the corresponding sector is stopped.
The invention has the following beneficial effects:
the directional percussion mechanism integrates detection discovery and directional percussion, is simple and practical, greatly improves the linkage overall performance while saving cost, and is convenient to install and maintain and high in reliability.
The present invention will be described in further detail below with reference to the accompanying drawings.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the invention and, together with the description, serve to explain the invention and not to limit the invention. In the drawings:
FIG. 1 is a block diagram of the components of an apparatus according to an embodiment of the invention.
Fig. 2 is a schematic flowchart of the operation of the spectrum sensing module according to the embodiment of the present invention.
Detailed Description
The embodiments of the invention will be described in detail below with reference to the drawings, but the invention can be implemented in many different ways as defined and covered by the claims.
Example 1
The embodiment discloses a spectrum detection and directional interference device, as shown in fig. 1, including:
the frequency spectrum detection module and the directional interference module of the same antenna array are shared by the full duplex module.
And a radio frequency switch is arranged between the frequency spectrum detection module and the full duplex module.
The radio frequency switch is controlled by the main control module to dynamically switch the sector scanned by the spectrum detection module.
The main control module is also respectively connected with the frequency spectrum detection module and the directional interference module and used for determining a scanning sector, judging whether the frequency spectrum type of a signal of the current sector is telemetering of an unmanned aerial vehicle or a picture transmission signal, if so, selecting an adjacent sector for amplitude comparison, and selecting an antenna direction corresponding to a sector with the largest amplitude and the telemetering and picture transmission signals conforming to the signal frequency spectrum characteristics of the unmanned aerial vehicle as the direction of arrival of the unmanned aerial vehicle; then, generating a suppression interference radio frequency signal through the directional interference module, and executing radio frequency radiation to an antenna of the sector through the unmanned aerial vehicle; and in the scanning process of subsequent sector polling, if the antenna scanning radiating the directional interference does not track the unmanned aerial vehicle telemetering or image transmission signal, the directional interference work facing the corresponding sector is stopped.
Preferably, the full-duplex module is provided with a spacer ring.
Preferably, the antenna array adopts a full-airspace antenna array based on the patent CN107094062B technology by the applicant of the present application, the full-airspace antenna array is formed by that 4 adjacent antennas correspond to one sector, and the centers of the 4 antennas corresponding to the same sector and the connecting surface of the antenna array housing are respectively 4 vertexes of a trapezoid. Therefore, the detection and interference of a full airspace can be realized; and the azimuth angle and the elevation angle can be measured simultaneously by comparing the amplitude and the direction of the three-dimensional antenna array surface, and the direction-finding precision can reach 1 degree to 3 degrees. Correspondingly, as shown in fig. 2, the spectrum detection module includes 4 receiving channels respectively corresponding to 4 antennas of the same sector, each channel includes an LNA, a down-conversion and data acquisition, and the data acquired by the 4 channels are processed by amplitude comparison and spectrum type analysis algorithms.
In the working process of the equipment, the equipment can be divided into three stages of rapid scanning, tracking direction finding and directional striking.
A fast scanning stage: selecting a sector formed by 4 trapezoidal distributed antennas adjacent in the horizontal and vertical directions, starting to switch scanning clockwise or anticlockwise quickly, performing amplitude comparison algorithm processing on acquired data in each scanning dwell time ms level, and if the amplitude comparison value is larger than a threshold value, switching to a tracking direction-finding stage. And (4) scanning the switching time us, wherein N/4 times of scanning the complete wave beam is needed, N is the number of antenna array elements, and the scanning is finished at most in 1 second.
Tracking and direction finding stages: and acquiring data of a second level, performing spectrum type algorithm analysis, determining whether the signal spectrum type is an unmanned aerial vehicle telemetering or image transmission signal, and if so, selecting the amplitude ratio of adjacent sectors, thereby further improving the direction finding precision.
Directional striking stage: and according to the result of tracking and direction finding, controlling a directional interference module to send a high-power interference signal, selecting an antenna to which the interference is aligned to radiate, then selecting the next sector, and switching to a rapid scanning stage to continue working.
Reference may further be made to example 2 below based on the workflow of the present apparatus.
Example 2
In the method, software and hardware are deployed according to the embodiment 1, a spectrum detection module and a directional interference module which share the same antenna array through a full-duplex module are deployed in the same equipment, and a radio frequency switch is arranged between the spectrum detection module and the full-duplex module; the radio frequency switch is controlled by a main control module to dynamically switch the sector scanned by the spectrum detection module; the main control module is also respectively connected with the frequency spectrum detection module and the directional interference module. The method of the embodiment comprises the following steps:
determining a scanning sector, judging whether the signal spectrum type of the current sector is unmanned aerial vehicle telemetering or image transmission signals, if so, selecting the amplitude of the adjacent sector, and selecting the antenna direction corresponding to the sector with the maximum amplitude and the telemetering and image transmission signals conforming to the signal spectrum characteristics of the unmanned aerial vehicle as the coming direction of the unmanned aerial vehicle; then, generating a suppression interference radio frequency signal through the directional interference module, and executing radio frequency radiation to an antenna of the sector through the unmanned aerial vehicle; and in the scanning process of subsequent sector polling, if the antenna scanning radiating the directional interference does not track the unmanned aerial vehicle telemetering or image transmission signal, the directional interference work facing the corresponding sector is stopped.
Preferably, in this embodiment, a sector is determined by 4 adjacent antennas, and 4 receiving channels respectively corresponding to 4 antennas of the same sector are set in the spectrum detection module, each channel includes an LNA, down-conversion and data acquisition, and data acquired by the 4 channels are uniformly processed by amplitude comparison and spectrum type analysis algorithms to determine whether the spectrum type of a signal in the sector is a signal for unmanned aerial vehicle telemetry or image transmission.
Preferably, in the course of determining the direction of arrival of the drone, the present embodiment selects the ratio of 4 adjacent sectors on the top, bottom, left and right of the current sector respectively.
Preferably, the embodiment suppresses the interfering rf signals into a plurality of broadband swept-frequency interfering signals at least covering the frequency bands of drone telemetry, pattern transmission and satellite navigation.
One optional specific workflow includes:
step S1, the system initially works in the fast scanning stage: the main control module selects a sector at each time, and a radio frequency selector switch is arranged, so that unmanned aerial vehicle remote control and image transmission signals received by the upper antenna, the lower antenna, the left antenna and the right antenna in the sector are respectively subjected to 4 LNAs, down conversion and data acquisition by the frequency spectrum detection module, the data acquisition duration time us is of the magnitude, and 4 acquired signals are uniformly subjected to amplitude comparison algorithm processing.
Step S2, if the comparison amplitude is larger than the threshold value, the tracking and direction finding stage is needed to be entered; otherwise, the next sector is selected in the clockwise direction or the counterclockwise direction, and the step S1 is repeated.
Step S3, tracking and direction finding stage: and continuously acquiring the four-channel data of the ms level, uniformly carrying out amplitude comparison and spectrum type analysis, and judging whether the signals are telemetering signals or image transmission signals of the unmanned aerial vehicle.
And S4, if the signal is a survey signal or a map transmission signal, sequentially selecting adjacent upper, lower, left and right sectors, then repeating the step S3, selecting the sector with the largest amplitude and the telemetry and map transmission signals conforming to the spectrum characteristics of the signal of the unmanned aerial vehicle, and determining the antenna direction corresponding to the signal as the coming direction of the unmanned aerial vehicle.
And step S5, the main control module controls the directional interference module corresponding to the antenna determined in step S4 to work, generates a high-power remote control, image transmission and satellite navigation frequency band broadband suppression interference radio frequency signal, and radiates through the antenna.
Step S6, the main control module selects the next sector in the clockwise direction or the counterclockwise direction, and repeats step S1.
And step S7, if the antenna radiating the directional interference does not scan and track the unmanned aerial vehicle telemetering or image transmission signal, stopping the work of the directional interference module and not radiating the interference signal any more.
To sum up, the spectrum detection and directional interference apparatus and method respectively disclosed by the embodiments of the present invention have at least the following advantages:
1. the unmanned aerial vehicle target detection system has the integrated working characteristics of full airspace detection discovery and directional striking, and can be used for resisting unmanned aerial vehicle aerospace integrated multi-target simultaneous detection discovery and directional striking of a plurality of unmanned aerial vehicle targets.
2. The three-dimensional antenna array surface compares the amplitude and the direction, the azimuth angle and the elevation angle can be measured simultaneously, and the direction-finding precision is 1-3 degrees.
3. The realization scheme is simple, and one set of system can realize that full airspace surveys discovery and accurate location is strikeed, saves the cost, and installation maintenance is convenient, and the reliability is high.
4. The two systems can be networked to form a wide-area full-space spectrum detection ranging, direction-finding and positioning system, so that the position of the unmanned aerial vehicle can be accurately determined.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (8)
1. A spectrum sensing and directional jamming device, comprising:
sharing a frequency spectrum detection module and a directional interference module of the same antenna array through a full duplex module;
a radio frequency switch is arranged between the frequency spectrum detection module and the full duplex module;
the radio frequency switch is controlled by a main control module to dynamically switch the sector scanned by the spectrum detection module;
the main control module is also respectively connected with the frequency spectrum detection module and the directional interference module and used for determining a scanning sector, judging whether the frequency spectrum type of a signal of the current sector is telemetering of an unmanned aerial vehicle or a picture transmission signal, if so, selecting an adjacent sector for amplitude comparison, and selecting an antenna direction corresponding to a sector with the largest amplitude and the telemetering and picture transmission signals conforming to the signal frequency spectrum characteristics of the unmanned aerial vehicle as the direction of arrival of the unmanned aerial vehicle; then, generating a suppression interference radio frequency signal through the directional interference module, and executing radio frequency radiation to an antenna of the sector through the unmanned aerial vehicle; and in the scanning process of subsequent sector polling, if the antenna scanning radiating the directional interference does not track the unmanned aerial vehicle telemetering or image transmission signal, the directional interference work facing the corresponding sector is stopped.
2. The spectrum detection and directional jamming device of claim 1, characterized in that the full duplex module is provided with an isolation ring.
3. The spectrum detection and directional interference apparatus according to claim 1 or 2, wherein the antenna array employs a full-airspace antenna array, the full-airspace antenna array is composed of 4 adjacent antennas corresponding to a sector, and the centers of the 4 antennas corresponding to the same sector and the connection surface of the antenna array housing are respectively 4 vertexes of a trapezoid.
4. The spectrum detection and directional jamming device according to claim 3, wherein the spectrum detection module includes 4 receiving channels corresponding to 4 antennas of the same sector, each channel includes an LNA, down-conversion and data acquisition, and data acquired by the 4 channels are processed by amplitude comparison and spectrum type analysis algorithms.
5. A frequency spectrum detection and directional interference method is characterized in that a frequency spectrum detection module and a directional interference module sharing the same antenna array through a full-duplex module are deployed in the same equipment, and a radio frequency switch is arranged between the frequency spectrum detection module and the full-duplex module; the radio frequency switch is controlled by a main control module to dynamically switch the sector scanned by the spectrum detection module; the main control module is also respectively connected with the frequency spectrum detection module and the directional interference module; the method comprises the following steps:
determining a scanning sector, judging whether the signal spectrum type of the current sector is unmanned aerial vehicle telemetering or image transmission signals, if so, selecting the amplitude of the adjacent sector, and selecting the antenna direction corresponding to the sector with the maximum amplitude and the telemetering and image transmission signals conforming to the signal spectrum characteristics of the unmanned aerial vehicle as the coming direction of the unmanned aerial vehicle; then, generating a suppression interference radio frequency signal through the directional interference module, and executing radio frequency radiation to an antenna of the sector through the unmanned aerial vehicle; and in the scanning process of subsequent sector polling, if the antenna scanning radiating the directional interference does not track the unmanned aerial vehicle telemetering or image transmission signal, the directional interference work facing the corresponding sector is stopped.
6. The method for spectrum detection and directional interference according to claim 5, further comprising:
a sector is determined by 4 adjacent antennas, 4 receiving channels respectively corresponding to the 4 antennas of the same sector are arranged in the frequency spectrum detection module, each channel comprises an LNA (low-noise amplifier), down-conversion and data acquisition, and the data acquired by the 4 channels are processed by amplitude comparison and frequency spectrum type analysis algorithms in a unified mode to judge whether the frequency spectrum type of a signal of the sector is an unmanned aerial vehicle telemetering or image transmission signal.
7. The method of claim 5 or 6, wherein in determining the direction of arrival of the drone, 4 adjacent sectors are selected, respectively, which are adjacent to the current sector, i.e. up, down, left, and right.
8. The method for spectrum detection and directional jamming according to claim 5 or 6, characterized in that the jamming RF signals are a plurality of broadband swept-frequency jamming signals covering at least the UAV telemetry, graph transmission, satellite navigation bands.
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| CN202011359668.7A CN112511244A (en) | 2020-11-27 | 2020-11-27 | Spectrum detection and directional interference equipment and method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114355801A (en) * | 2021-12-13 | 2022-04-15 | 浙江大学 | Unmanned aerial vehicle simulation picture transmission communication autonomous interference system |
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Application publication date: 20210316 |
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