Anti-drone jamming device

Abstract

The utility model provides a kind of anti-Drone interference equipment, only one amplifier, radio frequency signal produced after the controllable self-excitation oscillation of the amplifier is transmitted via antenna;Further comprising: feedback circuit;The feedback circuit is sampled from the amplifier output end, including feedback resistance and feedback capacitor;Sampling signal formed after sampling from the amplifier output end is sequentially connected to the input end of the amplifier after passing through feedback resistance and feedback capacitor;Second feedback capacitor, the second feedback capacitor is connected in parallel at the two ends of feedback capacitor;Frequency control voltage Vc is connected at the upstream of second feedback capacitor and feedback capacitor, and ground is connected at the downstream.The anti-Drone interference equipment of the utility model, only one amplifier, can greatly reduce material cost, greatly reduce production manufacturing difficulty.

Description

Technical Field

[0001] This utility model relates to the field of radio frequency circuits, and in particular to an anti-drone jamming device, which is a radio frequency jamming device. Background Technology

[0002] With the rapid popularization of drone technology, while bringing convenience, it has also raised various issues such as security and privacy. Anti-drone jamming equipment, as a key technological means to combat illegal flights, controls drones through various jamming methods and has played an important role in military, public safety, and aviation management fields.

[0003] Anti-drone jamming equipment mainly interferes with the communication, navigation or sensing systems of drones, causing them to lose control or be unable to complete their missions. The core technologies can be divided into three categories: electromagnetic interference, physical interference and emerging composite technologies.

[0004] Currently, anti-drone jamming equipment generally adopts a VCO+PA architecture, while more advanced systems use a DDS+PA architecture. The basic principles of the two are similar, which is a frequency source + power amplifier mode. That is, the frequency source generates the interference frequency, then amplifies the power of this interference frequency signal and transmits it through the antenna to achieve the purpose of interfering with the drone's communication.

[0005] Basic principle block diagram as follows Figure 1 As shown:

[0006] The workflow is as follows:

[0007] A VCO or DDS source generates a radio frequency signal at a certain frequency according to frequency control. This signal is amplified step by step by a first-stage amplifier, a second-stage amplifier, and a third-stage amplifier until it reaches the rated power. Then, it is transmitted through an antenna, forming a radio frequency interference source.

[0008] Such radio frequency jamming devices have some drawbacks when used in anti-drone jamming equipment:

[0009] 1. The material cost is relatively high. According to the principle block diagram, it contains a VCO, three amplifiers and corresponding peripheral auxiliary devices.

[0010] 2. High production difficulty: Due to the relatively complex architecture, including VCO / DDS frequency control, amplifier operating status adjustment, and overall system integration, there are many production steps and a lot of assembly and debugging work required, which will result in higher production efficiency and costs. Utility Model Content

[0011] This invention addresses the aforementioned shortcomings of conventional radio frequency jammers by providing an anti-drone jamming device.

[0012] The technical solution for achieving the technical objective of this utility model is: an anti-drone jamming device, comprising a single amplifier, wherein a radio frequency signal generated by the controllable self-oscillation of the amplifier is transmitted via an antenna; and further comprising:

[0013] Feedback circuit; the feedback circuit samples from the output of the amplifier and includes a feedback resistor and a feedback capacitor; the sampled signal formed after sampling from the output of the amplifier passes through the feedback resistor and the feedback capacitor in sequence and is then connected to the input of the amplifier;

[0014] The second feedback capacitor is connected in parallel across the two ends of the feedback capacitor.

[0015] The second feedback capacitor and the upstream of the feedback capacitor are connected to the frequency control voltage Vc, and the downstream is grounded.

[0016] Furthermore, in the aforementioned anti-drone jamming device, the second feedback capacitor is a varactor diode.

[0017] Furthermore, the aforementioned anti-drone jamming device also includes bias resistors R1 and R2; bias resistor R2 is disposed between the anode of the varactor diode and the frequency control voltage Vc; bias resistor R1 is disposed between the cathode of the varactor diode and ground.

[0018] Furthermore, in the aforementioned anti-drone jamming device, the amplifier uses a UHF power LDMOS transistor Q1 with model number BLF647F.

[0019] Furthermore, in the aforementioned anti-drone jamming device: the feedback circuit includes a first basic negative feedback circuit composed of a feedback capacitor C14 and a feedback resistor R5, and a second basic negative feedback circuit composed of a feedback capacitor C23 and a feedback resistor R6.

[0020] The second feedback capacitor connected in parallel across the feedback capacitor C14 in the first basic negative feedback circuit includes varactor diodes D1 and D2; the cathodes of varactor diodes D1 and D2 are connected together, and their anodes are respectively connected to the two ends of the feedback capacitor C14.

[0021] The second feedback capacitor connected in parallel across the feedback capacitor C23 in the second basic negative feedback circuit includes varactor diodes D3 and D4; the cathodes of varactor diodes D3 and D4 are connected together, and the anodes are respectively connected to the two ends of the feedback capacitor C23.

[0022] Furthermore, in the aforementioned anti-drone jamming device: V_tune, which adjusts the feedback parameters, is introduced between varactor diodes D1 and D2 and between varactor diodes D3 and D4.

[0023] Furthermore, in the aforementioned anti-drone jamming device: an input matching network is provided at the input end of the amplifier, and an output matching network is provided at the output end of the amplifier; the input matching network and the output matching network include a transmission line transformer and a balun.

[0024] The anti-drone jamming device of this invention uses only one amplifier, which can significantly reduce material costs and manufacturing difficulty.

[0025] The present invention will now be described in more detail with reference to the accompanying drawings and embodiments. Attached Figure Description

[0026] Appendix Figure 1 Block diagram of a conventional radio frequency jammer;

[0027] Appendix Figure 2 This is a block diagram illustrating the principle of anti-drone jamming equipment.

[0028] Appendix Figure 3 This is a circuit diagram of the anti-drone jamming device according to Embodiment 1 of this utility model. Detailed Implementation

[0029] This embodiment is an anti-drone jamming device, such as... Figure 2 and Figure 3 As shown in this embodiment: an anti-drone jamming device uses only one amplifier A. The radio frequency signal generated by the controllable self-oscillation of amplifier A is transmitted through an antenna; it also includes: a feedback circuit; the feedback circuit samples from the output of the amplifier and includes a feedback resistor and a feedback capacitor; the sampled signal formed after sampling from the output of the amplifier passes through the feedback resistor and the feedback capacitor in sequence and is then connected to the input of the amplifier.

[0030] The second feedback capacitor C1 is connected in parallel across the two ends of the feedback capacitor; the second feedback capacitor is a varactor diode.

[0031] The second feedback capacitor and the upstream of the feedback capacitor are connected to the frequency control voltage Vc, and the downstream is grounded.

[0032] It also includes bias resistors R1 and R2; bias resistor R2 is placed between the anode of the varactor diode and the frequency control voltage Vc; bias resistor R1 is placed between the cathode of the varactor diode and ground.

[0033] like Figure 2 As shown, the main functional components constituting this utility model and the function of each component are as follows:

[0034] Amplifier A: The core component of the jammer, which is used to achieve frequency oscillation and output of jamming radio frequency power signals.

[0035] Matching network L1: This is the peripheral circuit of amplifier A, ensuring good input matching for the amplifier.

[0036] Matching network L2: This is the peripheral circuit of amplifier A, ensuring good output matching of the amplifier.

[0037] Feedback capacitor C: This is the core component of the present invention. The parameters of the feedback capacitor determine the properties of the feedback circuit, that is, to form positive feedback at a certain frequency.

[0038] Feedback capacitor C1: This is the core component of the present invention. By adjusting the capacitor parameters, the frequency attribute of the feedback circuit is determined, that is, the oscillation frequency is adjusted.

[0039] Feedback resistor R: This is the core component of the invention, which plays a role in adjusting the feedback depth (feedback magnitude) to form a safe and controllable self-excited oscillation.

[0040] Bias resistors R1 and R2: provide bias voltage for varactor diode C1, thereby adjusting the capacitance value of the varactor diode.

[0041] The basic working principle of this embodiment is as follows:

[0042] After the interference system is powered on, amplifier A, feedback resistor R, feedback capacitor C, and C1 form the positive feedback circuit of the amplifier. The amplifier generates a self-excited oscillation signal at a certain frequency. By adjusting the value of the feedback resistor, the feedback depth can be adjusted, thereby achieving stable oscillation of frequency and power.

[0043] By changing the control voltage Vc, the size of the varactor diode C1 is adjusted. The varactor diode C1 and the feedback capacitor C form a parallel capacitor, thereby adjusting the overall size of the feedback capacitor, which in turn controls the frequency of the amplifier's self-oscillation, i.e., the controllable frequency output.

[0044] In this embodiment, the interference frequency source is generated by the self-oscillation of the amplifier, and the rated interference power is directly achieved in one step; the self-oscillation frequency is adjusted by a varactor diode to achieve the function of adjustable interference frequency.

[0045] In this embodiment 1, amplifier A uses a UHF power LDMOS transistor Q1 of model BLF647F. Figure 3 As shown, the feedback circuit includes a first basic negative feedback circuit consisting of a feedback capacitor C14 and a feedback resistor R5, and a second basic negative feedback circuit consisting of a feedback capacitor C23 and a feedback resistor R6.

[0046] The second feedback capacitor connected in parallel across the feedback capacitor C14 in the first basic negative feedback circuit includes varactor diodes D1 and D2; the cathodes of varactor diodes D1 and D2 are connected together, and their anodes are respectively connected to the two ends of the feedback capacitor C14.

[0047] The second feedback capacitor connected in parallel across the feedback capacitor C23 in the second basic negative feedback circuit includes varactor diodes D3 and D4; the cathodes of varactor diodes D3 and D4 are connected together, and the anodes are respectively connected to the two ends of the feedback capacitor C23.

[0048] V_tune, the adjustment feedback parameter, is introduced between varactor diodes D1 and D2 and between varactor diodes D3 and D4.

[0049] An input matching network is provided at the input of the amplifier, and an output matching network is provided at the output of the amplifier; the input and output matching networks include transmission line transformers and baluns. The capacitors used in the input matching network are typically 470pF / 100V capacitors, while the capacitors used in the output matching network are 560pF / 500V capacitors.

[0050] In this embodiment, the amplifier is a pair of transistors, specifically the UHF power LDMOS transistor Q1 of the BLF647F. The input / output matching network is constructed using a transmission line transformer and a balun. Capacitor C14 and resistor R5, along with capacitor C23 and resistor R6, form the basic negative feedback circuit. By connecting adjustable capacitors (varactor diodes D1, D2, D3, and D4) in parallel with the feedback capacitor, the feedback loop becomes positive feedback. Furthermore, the feedback parameters can be adjusted via V_tune, thereby achieving self-oscillation of amplifier Q1 and controlling its oscillation frequency.

[0051] In this embodiment, the amplifier output power is ≥200W, and the output frequency can be arbitrarily changed within the range of 300 to 400MHz by adjusting the voltage.

[0052] In addition, the biggest feature of this embodiment is that it only uses one transformer, which is the UHF power LDMOS transistor Q1 of BLF647F, which can significantly reduce material costs and manufacturing difficulty.

Claims

1. An anti-drone jamming device, comprising an amplifier, wherein a radio frequency signal generated by the amplifier's controllable self-oscillation is transmitted via an antenna; characterized in that: Also includes: Feedback circuit; The feedback circuit samples from the output of the amplifier and includes a feedback resistor and a feedback capacitor; the sampled signal formed after sampling from the output of the amplifier passes through the feedback resistor and the feedback capacitor in sequence and is then connected to the input of the amplifier. The second feedback capacitor is connected in parallel across the two ends of the feedback capacitor. The second feedback capacitor and the upstream of the feedback capacitor are connected to the frequency control voltage Vc, and the downstream is grounded.

2. The anti-drone jamming device according to claim 1, characterized in that: The second feedback capacitor is a varactor diode.

3. The anti-drone jamming device according to claim 2, characterized in that: It also includes bias resistors R1 and R2; bias resistor R2 is placed between the anode of the varactor diode and the frequency control voltage Vc; bias resistor R1 is placed between the cathode of the varactor diode and ground.

4. The anti-drone jamming device according to claim 1, 2, or 3, characterized in that: The amplifier uses a UHF power LDMOS transistor Q1 of model BLF647F.

5. The anti-drone jamming device according to claim 4, characterized in that: The feedback circuit includes a first basic negative feedback circuit consisting of a feedback capacitor C14 and a feedback resistor R5, and a second basic negative feedback circuit consisting of a feedback capacitor C23 and a feedback resistor R6. The second feedback capacitor connected in parallel across the feedback capacitor C14 in the first basic negative feedback circuit includes varactor diodes D1 and D2; the cathodes of varactor diodes D1 and D2 are connected together, and their anodes are respectively connected to the two ends of the feedback capacitor C14. The second feedback capacitor connected in parallel across the feedback capacitor C23 in the second basic negative feedback circuit includes varactor diodes D3 and D4; the cathodes of varactor diodes D3 and D4 are connected together, and the anodes are respectively connected to the two ends of the feedback capacitor C23.

6. The anti-drone jamming device according to claim 5, characterized in that: V_tune, the adjustment feedback parameter, is introduced between varactor diodes D1 and D2 and between varactor diodes D3 and D4.

7. The anti-drone jamming device according to claim 5, characterized in that: An input matching network is provided at the input end of the amplifier, and an output matching network is provided at the output end of the amplifier; the input matching network and the output matching network include a transmission line transformer and a balun.

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