Digital jammer

Abstract

The utility model discloses a digital jammer, relates to the technical field of radio frequency interference, and solves the problems that single high-power frequency sweeping interference equipment is used in an airport area in the prior art, and communication equipment in an airport which is in compliance use can be influenced while an unmanned aerial vehicle is interfered and invaded. According to the utility model, the power of the interference unit can be gradually increased from the minimum power until the interference effect is achieved, so that excessive interference and energy waste are avoided. Moreover, DDS digital interference generation is adopted, the frequency is accurate and adjustable, and accurate interference of the unmanned aerial vehicle can be realized in combination with frequency point detection equipment. Besides, the system is realized by building a plurality of small-power distributed cradle head directional jammers, and when the black flying unmanned aerial vehicle intrudes, the distributed cradle head directional jammers can form a focused high-intensity electromagnetic interference area in the target direction according to the target orientation detected by the detection equipment, so that the unmanned aerial vehicle can enter the unmanned aerial vehicle. Therefore, the capability of low accidental damage interference is realized.

Description

Technical Field

[0001] This utility model belongs to the field of radio frequency interference technology, and specifically relates to a digital jammer. Background Technology

[0002] In recent years, the drone industry has developed rapidly, and the application of drones has become increasingly widespread, with the number of drones in use showing a year-on-year growth trend. However, at the same time, drones have also brought serious security threats to various places in society. In recent years, incidents of drones affecting and attacking important infrastructure have occurred frequently, making the need for effective drone countermeasures urgent. Wireless signal jamming technology is the most common drone countermeasure technology. It interferes with the drone's remote control, image transmission, navigation, and other wireless signals by emitting jamming radio frequency signals, in order to drive away, interfere with, or force the drone to land.

[0003] Currently, the most commonly used wireless signal jamming technology on the market is the analog frequency sweep jammer using a VCO (Voltage-Controlled Oscillator). First, a triangular wave generator produces a triangular wave with a frequency of around tens of kHz. This triangular wave drives the voltage-controlled terminal of the VCO, causing the VCO to output a frequency sweep radio frequency signal. This signal is then amplified and transmitted through an antenna. This technology is low-cost, but due to the inherent variability of VCO devices, each channel of each VCO jammer requires frequency adjustment. Furthermore, since the VCO's output frequency changes with temperature, a certain protection bandwidth is needed to prevent the VCO frequency from drifting out of the target interference range. Moreover, most drones communicate using OFDM (Optical Frequency Division Multiplexing) protocols, which have error correction mechanisms and strong resistance to frequency sweep interference, often requiring high jamming power to achieve good results. In certain special scenarios, such as airport areas, using a single high-power frequency sweep jammer can often interfere with intrusive drones while also affecting compliant airport communication equipment.

[0004] Therefore, a digital jammer is needed. Utility Model Content

[0005] The purpose of this invention is to provide a digital jammer that overcomes the shortcomings of existing technologies that use single high-power frequency-sweeping jamming devices in airport areas, which, while interfering with intruding drones, also affect compliant airport communication equipment. The specific technical solution is as follows:

[0006] A digital jammer, comprising:

[0007] The time synchronization module is used to provide a time reference signal;

[0008] The digital interference generation unit is controlled by the MCU controller via the SPI signal line to operate the DDS generator and the local oscillator source of the corresponding frequency band. The sweep signal generated by the DDS is mixed with the corresponding local oscillator signal through a filter to generate a sweep signal near the corresponding frequency band. After passing through a filter and an amplifier, it is radiated outward by the directional antenna.

[0009] The main control board is connected to the timing module and the digital interference generation unit respectively. It is used to receive the time reference signal from the timing module and control the on / off state of the digital interference generation unit.

[0010] The AC-DC power supply module is connected to the main control board, the timing module, and the digital interference generation unit, respectively, and is used to supply power to the main control board, the timing module, and the digital interference generation unit.

[0011] Preferably, there are several digital interference generating units, and each digital interference generating unit has a different frequency band. Each digital interference generating unit is connected to the main control board, which is used to receive the time reference signal from the time synchronization module and control the on / off state of several digital interference generating units.

[0012] Preferably, there are at least four digital interference generating units, and the frequency bands of the four digital interference generating units correspond to four types: 5.8GHz / 5.2GHz / 2.4GHz / 1.5GHz.

[0013] Preferably, the digital interference generating unit includes a DDS module, an MCU module, a first filter, a second filter, a mixer module, a local oscillator module, an amplifier module, and a directional antenna; the DDS module is connected to the MCU module and the first filter, the MCU module is connected to the main control board, the DDS module, and the local oscillator module, the local oscillator module is connected to the MCU module and the mixer module, the mixer module is connected to the first filter, the second filter, and the local oscillator module, the second filter is connected to the mixer module and the amplifier module, and the amplifier module is also connected to the directional antenna.

[0014] Preferably, the amplification module includes a drive amplification module and a power amplification module, wherein the drive amplification module is connected to the filter and the power amplification module respectively, and the power amplification module is connected to the drive amplification module and the directional antenna respectively.

[0015] Preferably, it also includes a turntable, on which the digital interference generating unit is mounted to direct the directional antenna toward the target to be dealt with.

[0016] Preferably, the turntable includes a housing, a horizontal motor, a vertical motor, and a control module thereof, providing a rotation function for the load device so that the directional antenna is pointed at the target to be dealt with.

[0017] Preferably, it also includes a drone detection device, which is used to detect the latitude, longitude, and altitude coordinates of the drone and report them in real time.

[0018] Preferably, there are at least three digital jammers, which are deployed in a distributed manner with a deployment interval of more than 300 meters. The time information of the main control board inside each digital jammer is unified through a time synchronization module.

[0019] Compared with existing technologies, this utility model has the following beneficial effects:

[0020] High-efficiency power control with step-by-step power adjustment: The jammer can start from the minimum power and gradually increase it until the jamming effect is achieved, avoiding excessive interference and energy waste.

[0021] Precisely adjustable frequency: Utilizing DDS digital jamming generation, the frequency is precisely adjustable. Combined with frequency detection equipment, it can achieve precise jamming of drones.

[0022] Spatial intensity superposition interference: This is achieved by setting up multiple low-power distributed gimbal directional jammers. When an unauthorized drone flies in, the distributed gimbal directional jammers can form a focused high-intensity electromagnetic interference area in the direction of the target based on the target's location detected by the detection equipment (radar, spectrum). This results in low-false-damage interference capability. Attached Figure Description

[0023] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. In all the drawings, similar elements or parts are generally identified by similar reference numerals. The elements or parts in the drawings are not necessarily drawn to scale.

[0024] Figure 1 This is a schematic diagram of the module structure of this utility model.

[0025] Figure 2 This is a schematic diagram of the usage state of this utility model. Detailed Implementation

[0026] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0027] In the description of this utility model, it should be noted that the terms "center", "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "top surface", "bottom surface", "inner", "outer", "inner side", "outer side", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0028] In the description of this utility model, "several" means one or more, "multiple" means two or more, "greater than," "less than," and "exceeding" are understood to exclude the stated number, while "above," "below," and "within" are understood to include the stated number. If the terms "first," "second," and "third" are used in the description, they are for descriptive purposes and to distinguish technical features, and should not be construed as indicating or implying relative importance, or implicitly indicating the number of indicated technical features, or implicitly indicating the sequential relationship of the indicated technical features.

[0029] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "setting" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances. The embodiments of this utility model will now be described based on its overall structure.

[0030] Example 1

[0031] like Figure 1As shown, the digital jammer consists of a turntable, an AC-DC power supply module, a main control board, a timing module, a 5.8GHz digital jamming generator unit, a 5.2GHz digital jamming generator unit, a 2.4GHz digital jamming generator unit, a 1.5GHz digital jamming generator unit, and corresponding directional antennas. The AC-DC power supply module supplies power to the main control board, the timing module, and the four digital jamming generator units (5.8GHz / 5.2GHz / 2.4GHz / 1.5GHz). The main control board receives the time reference signal from the timing module and simultaneously controls the 5.8GHz / 5.2GHz / 2.4GHz / 1.5GHz digital jamming generator units. The four digital interference generating units at 5GHz are switched on and off. The four digital interference generating units at 5.8GHz / 5.2GHz / 2.4GHz / 1.5GHz are controlled by the MCU controller via the SPI signal line to operate the DDS generator and the local oscillator source corresponding to the 5.8GHz / 5.2GHz / 2.4GHz / 1.5GHz frequency bands. The sweep frequency signal generated by the DDS is mixed with the corresponding local oscillator signal after being filtered to generate a sweep frequency signal near the 5.8GHz / 5.2GHz / 2.4GHz / 1.5GHz frequency band. The signal is then radiated outward through a bandpass filter, a first-stage drive amplifier, a second-stage power amplifier, and a directional antenna.

[0032] The system comprises the following components: a time synchronization module (TSM) provides a time reference signal; a digital interference generator (DDS) controlled by an MCU controller via an SPI signal line operates a DDS generator and a local oscillator for the corresponding frequency band; the DDS-generated sweep signal is mixed with the corresponding local oscillator signal through a filter to generate a sweep signal near the corresponding frequency band; after passing through a filter and an amplifier, the sweep signal is radiated outward by a directional antenna; a main control board is connected to both the TSM and the DDS, receiving the time reference signal from the TSM and controlling the on / off state of the DDS; and an AC-DC power supply module is connected to the main control board, the TSM, and the DDS, providing power to all three components.

[0033] A time synchronization module is a device or module used to provide a unified time reference. Its core function is to ensure that all devices or units in the entire system can operate under the same time standard. In this embodiment, the time synchronization module uses GPS / BeiDou time synchronization or network time synchronization. The time synchronization module receives standard time information from external time signal sources (such as GPS, BeiDou satellite signals, IRIG-B time code, etc.) and synchronizes with these time signals. The time synchronization module can also output standard frequency signals, such as 2MHz, 5MHz, 10MHz, etc. These frequency signals are typically used to calibrate the clocks of other devices. When external time signal sources are lost or unavailable, the time synchronization module can continue to maintain the continuity and accuracy of time through its internal timekeeping unit (such as a temperature-controlled crystal oscillator or a rubidium atomic clock).

[0034] The digital interference generation unit includes a DDS module, an MCU module, a first filter, a second filter, a mixer module, a local oscillator module, an amplifier module, and a directional antenna. The DDS module is connected to the MCU module and the first filter. The MCU module is connected to the main control board, the DDS module, and the local oscillator module. The local oscillator module is connected to the MCU module and the mixer module. The mixer module is connected to the first filter, the second filter, and the local oscillator module. The second filter is connected to the mixer module and the amplifier module. The amplifier module is also connected to the directional antenna. The amplifier module includes a drive amplifier module and a power amplifier module. The drive amplifier module is connected to the filter and the power amplifier module, and the power amplifier module is connected to the drive amplifier module and the directional antenna.

[0035] In addition, a turntable is included, on which the digital interference generating unit is mounted. The turntable directs the directional antenna toward the target to be dealt with. The turntable includes a housing, a horizontal motor, a vertical motor, and a control module, providing the load device with rotation functionality to direct the directional antenna toward the target to be dealt with.

[0036] In this embodiment, it should be understood that the turntable can be understood as an antenna turntable or an antenna pointing turntable, which is a device that enables the antenna to rotate in the horizontal and vertical directions to adjust the antenna's direction so that it can point to different target positions. Antenna turntables are technically very mature and are widely used in various scenarios requiring high-precision pointing control. For example, some precision turntables can achieve high repeatability (e.g., below 5 arcseconds) and high rigidity design. In addition, antenna turntables can be customized according to different needs, such as single-axis or multi-axis turntables. Based on this, the specific structure of the turntable will not be described in detail here; its function is only to point the directional antenna to the target to be dealt with.

[0037] Next, as Figure 2 As shown, the working principle of this embodiment will be described in detail to enable those skilled in the art to better understand this utility model:

[0038] Using drone detection equipment and three or more digital jammers, interference can be achieved through superimposed radio frequency intensity and superimposed radio frequency band.

[0039] The specific working process of interference by superimposing radio frequency intensity is as follows:

[0040] Step 1: Multiple digital jammers are deployed in a distributed manner, with a deployment interval of more than 300 meters.

[0041] Step two: The time information of the main control board inside the digital jammer is unified through the time synchronization module;

[0042] Step 3: The drone detection equipment detects the latitude, longitude, and altitude coordinates of the drone and reports them to the digital jammer in real time;

[0043] Step 4: Point the antenna of the digital jammer gimbal control device towards the target direction of the drone, and at the same time activate digital frequency sweep jamming with minimum power amplifier gain.

[0044] Step 5: The drone detection equipment continuously assesses the interference effect to determine whether the drone target is forced to land or driven away;

[0045] Step six: The digital jammer gradually increases the jamming power until the jamming is effective.

[0046] The working process of superimposing interference in the radio frequency band is as follows:

[0047] Step 1: Multiple digital jammers are deployed at a common location;

[0048] Step 2: The DDS generators of the internal interference units of multiple digital jammers generate frequency-sweeping interference signals with interleaved frequency bands.

[0049] Step 3: The drone detection equipment detects the latitude, longitude, and altitude coordinates of the drone and reports them to multiple digital jammers in real time.

[0050] Step 4: Point the antenna of the digital jammer gimbal control device towards the target direction of the drone, and at the same time activate digital frequency sweep jamming with minimum power amplifier gain.

[0051] Step 5: The drone detection equipment continuously assesses the interference effect to determine whether the drone target is forced to land or driven away;

[0052] Step six: The digital jammer gradually increases the jamming power until the jamming is effective.

[0053] Among them, UAV detection equipment is radar detection equipment, spectrum detection equipment, or photoelectric detection equipment, or a combination of the above.

[0054] Radar detection equipment is a device that uses the reflection characteristics of electromagnetic waves to detect the position, speed, and shape of targets. It detects unmanned aerial vehicles (UAVs) by emitting electromagnetic waves and receiving reflected signals. It can provide information such as the UAV's distance, azimuth, speed, and altitude, forming a three-dimensional situational awareness. Radar systems are characterized by all-weather operation, wide-area coverage, and high-precision detection, and can work stably under complex weather conditions. Furthermore, radar can work in conjunction with spectrum analysis equipment and photoelectric tracking equipment to achieve high-precision positioning and tracking of UAVs.

[0055] Spectrum detection equipment is primarily used to monitor and analyze signals in the radio spectrum. It can scan and capture radio signals within a specific frequency band in real time, identifying the signal's source, type, and frequency. It identifies drones by analyzing the spectral characteristics of radio signals. It can capture drone remote control and image transmission signals, extracting parameters such as frequency, bandwidth, and power, thereby achieving drone detection and positioning. This equipment employs an FFT algorithm and a TDOA+AOA hybrid positioning system, enabling rapid response and high-precision positioning. Spectrum detection equipment features high sensitivity, wide frequency band coverage, and all-weather monitoring, making it suitable for complex electromagnetic environments.

[0056] Optoelectronic detection equipment is a device that converts light signals into electrical signals based on the photoelectric effect. It can use sensors in the visible light or infrared bands to detect drones. Combining optical imaging and infrared imaging technologies, it can detect and track drones both day and night. Optoelectronic detection systems are typically equipped with high-resolution cameras, infrared thermal imagers, and laser rangefinders, providing high-precision target information in complex environments. Its advantages lie in its high detection accuracy and good adaptability to low-altitude targets.

[0057] Since radar detection equipment, spectrum detection equipment, and photoelectric detection equipment are all relatively mature devices in this field and are not the subject of this application, they will not be described in detail here.

[0058] In summary, the jammer designed in this invention can start with the minimum power and gradually increase until the jamming effect is achieved, avoiding excessive interference and energy waste. Furthermore, this invention uses DDS digital jamming generation with precisely adjustable frequency. Combined with frequency detection equipment, it can achieve precise jamming of drones. In addition, this invention draws on the principles and ideas of tumor radiotherapy, achieving this by constructing multiple low-power distributed gimbal-based directional jammers. When an unauthorized drone intrudes, the distributed gimbal-based directional jammers, based on the target's location detected by detection equipment (radar, spectrum), can easily calculate the jamming direction and power, forming a focused high-intensity electromagnetic interference area in the target's direction, thus achieving low-collateral damage jamming capability.

[0059] The foregoing description of specific exemplary embodiments of the present invention is for illustrative and explanatory purposes. These descriptions are not intended to limit the present invention to the precise forms disclosed, and it is obvious that many changes and variations can be made based on the above teachings. Although embodiments of the present invention have been shown and described, these specific embodiments are merely explanations of the present invention and are not intended to limit the invention. The specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. The purpose of selecting and describing exemplary embodiments is to explain the specific principles of the present invention and its practical application, so that those skilled in the art, after reading this specification, can make modifications, substitutions, variations, and various choices and changes to the embodiments as needed without departing from the principles and spirit of the present invention, provided that such modifications, substitutions, variations, and choices and changes are within the scope of the claims of the present invention and are protected by patent law.

Claims

1. A digital jammer, characterized in that, include: The time synchronization module is used to provide a time reference signal; The digital interference generation unit is controlled by the MCU controller via the SPI signal line to operate the DDS generator and the local oscillator source of the corresponding frequency band. The sweep signal generated by the DDS is mixed with the corresponding local oscillator signal through a filter to generate a sweep signal near the corresponding frequency band. After passing through a filter and an amplifier, it is radiated outward by the directional antenna. The main control board is connected to the timing module and the digital interference generation unit respectively. It is used to receive the time reference signal from the timing module and control the on / off state of the digital interference generation unit. The AC-DC power supply module is connected to the main control board, the timing module, and the digital interference generation unit, respectively, and is used to supply power to the main control board, the timing module, and the digital interference generation unit.

2. A digital jammer according to claim 1, characterized in that, There are several digital interference generating units, and each digital interference generating unit has a different frequency band. Each digital interference generating unit is connected to the main control board. The main control board is used to receive the time reference signal from the time synchronization module and control the on / off state of several digital interference generating units.

3. A digital jammer according to claim 2, characterized in that, There are at least four digital interference generating units, and the frequency bands of the four digital interference generating units correspond to four types: 5.8GHz / 5.2GHz / 2.4GHz / 1.5GHz.

4. A digital jammer according to claim 1, characterized in that, The digital interference generation unit includes a DDS module, an MCU module, a first filter, a second filter, a mixer module, a local oscillator module, an amplifier module, and a directional antenna. The DDS module is connected to the MCU module and the first filter. The MCU module is connected to the main control board, the DDS module, and the local oscillator module. The local oscillator module is connected to the MCU module and the mixer module. The mixer module is connected to the first filter, the second filter, and the local oscillator module. The second filter is connected to the mixer module and the amplifier module. The amplifier module is also connected to the directional antenna.

5. A digital jammer according to claim 4, characterized in that, The amplification module includes a drive amplification module and a power amplification module. The drive amplification module is connected to both the filter and the power amplification module, and the power amplification module is connected to both the drive amplification module and the directional antenna.

6. A digital jammer according to claim 1, characterized in that, It also includes a turntable, on which the digital interference generating unit is mounted to direct the directional antenna toward the target to be dealt with.

7. A digital jammer according to claim 6, characterized in that, The turntable includes a housing, a horizontal motor, a pitch motor, and a control module, providing the load device with rotation functionality so that the directional antenna is pointed at the target to be dealt with.

8. A digital jammer according to claim 1, characterized in that, It also includes drone detection equipment, which is used to detect the latitude, longitude, and altitude coordinates of drones and report them in real time.

9. A digital jammer according to claim 1, characterized in that, The digital jammers consist of at least three units, which are deployed in a distributed manner with a spacing of more than 300 meters between them. The time information of the main control board inside each digital jammer is unified through a time synchronization module.

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