High-stability unmanned aerial vehicle interference signal source and control method thereof

Abstract

The invention relates to a high-stability unmanned aerial vehicle interference signal source and a control method thereof.Based on the closed-loop control principle, a radio frequency receiver, a processor and a digital / analog conversion device are adopted to monitor frequency and bandwidth parameters of a conventional analog sweep frequency signal source in real time; and the digital / analog conversion device outputs analog voltage to control the frequency and bandwidth of the analog frequency sweep signal source, so that the working state of the analog frequency sweep signal source is corrected in real time, and the short-term and long-term stability of the working state of the analog frequency sweep signal source is realized. The method is applied to related fields of unmanned aerial vehicles. According to the method, the frequency stability of an unmanned aerial vehicle interference signal source can be greatly improved on the basis of a current conventional scheme, and out-of-band emission of unmanned aerial vehicle interference countering equipment is reduced, so that adverse effects of the unmanned aerial vehicle interference countering equipment on other communication equipment are reduced, and the interference countering effect is improved to a certain extent.

Description

Technical Field

[0001] The present invention relates to the technical field related to drones, and in particular to a high-stability drone interference signal source and a control method thereof. Background Art

[0002] The UAV jamming signal source is a key component of UAV jamming countermeasures. Within UAV jamming countermeasures, the transmitted signal frequency and bandwidth depend on the UAV jamming signal source. Traditional UAV jamming signal sources typically utilize analog frequency sweeping, which suffers from poor stability, especially due to thermal stability and long-term stability caused by device aging. This results in unstable transmission frequencies and bandwidths for UAV jamming countermeasures. To maintain device effectiveness, the transmission bandwidth must be pre-adjusted beyond the required range. This ensures that the transmitted signal frequency range remains within the required range in both high and low temperature environments and after a period of device aging. However, this presents a problem: a signal bandwidth exceeding the required width can interfere with other communication equipment. Furthermore, an overly wide jamming signal disperses the limited jamming energy, reducing the energy density of the jamming signal and its effectiveness compared to a precisely controlled bandwidth.

[0003] There are currently two main solutions to the aforementioned UAV interference signal source stability issue: Temperature compensation: In analog frequency sweep circuits, temperature compensation devices are used to replace conventional fixed-parameter devices, such as temperature compensation resistors instead of conventional resistors. By selecting appropriate temperature compensation devices, the parameters that originally changed due to temperature changes can be kept within a relatively small range. Using this method, first, it can only solve the frequency stability problem of the signal source output signal caused by temperature, and cannot solve the stability problem caused by device aging, other environmental factors, etc.; second, the temperature characteristics of the signal source before temperature compensation are nonlinear, and the existing technology cannot provide a temperature compensation device that can completely correct the nonlinear characteristics, and the compensation accuracy is limited, which cannot meet the current requirements for signal source stability.

[0004] Reference Figure 4 , using a digitally synthesized RF signal method: using a reference clock, DDS (direct digital synthesizer), upconverter and other devices to form a digitally synthesized RF signal source. The frequency accuracy of the digitally synthesized RF signal source depends on the accuracy of the reference clock. By selecting a reference clock with good stability, the stability of the entire signal source is achieved; Using this method, first, the digitally synthesized RF signal needs to calculate the output frequency of each instant in real time when working in the required sweep mode, which greatly reduces the sweep speed of the signal source and cannot achieve the actual interference countermeasure effect of the traditional analog signal source; second, the RF signal source using the digital synthesis solution is expensive and large in size, which cannot be widely popularized or technically upgraded on the original small equipment. Summary of the Invention

[0005] The purpose of the present invention is to solve at least one of the deficiencies of the prior art and to provide a high-stability UAV interference signal source and a control method thereof.

[0006] In order to achieve the above object, the present invention adopts the following technical solutions: Specifically, a control method for a high-stability UAV interference signal source is proposed, including the following: Step 110: Set the receiver frequency to the starting frequency; Step 120: Determine whether the current receiver frequency reaches the termination frequency. If the current receiver frequency does not reach the termination frequency, increase the receiver frequency by a preset step size until the current receiver frequency reaches the termination frequency. Step 130: Calculate the spectrum center frequency corresponding to the end frequency, and adjust the spectrum center frequency to within the frequency error range based on the center frequency control voltage. If the spectrum center frequency is already within the frequency error range, no adjustment is required, thereby obtaining a qualified spectrum center frequency. Step 140: Calculate the spectrum bandwidth corresponding to the qualified spectrum center frequency, and control the spectrum bandwidth within a bandwidth error range based on the spectrum bandwidth control voltage. If the spectrum bandwidth is already within the bandwidth error range, no adjustment is required, and the qualified spectrum bandwidth is obtained. Repeat the above steps 110 to 140.

[0007] Further, specifically, the step 130 includes: Step 131: determine whether the spectrum center frequency is within the frequency error range. Step 132: If yes, directly use the current spectrum center frequency as the qualified spectrum center frequency without adjustment; if no, further determine whether the spectrum center frequency is too high; Step 133: If the center frequency is too high, reduce the center frequency control voltage; if the center frequency is not too high, increase the center frequency control voltage. Repeat steps 131 to 133 until a qualified spectrum center frequency is obtained.

[0008] Further, specifically, the step 140 includes: Step 141: Determine whether the spectrum bandwidth is within the bandwidth error range. Step 142: If yes, directly use the current spectrum bandwidth as the qualified spectrum bandwidth without adjustment; if no, further determine whether the spectrum bandwidth is too large; Step 143: If the value is too large, then the spectrum width control voltage is reduced; if the value is not too large, then the spectrum width control voltage is increased. Repeat steps 141 to 143 until a qualified spectrum bandwidth is obtained.

[0009] The present invention also proposes a high-stability UAV interference signal source, comprising: Analog swept frequency oscillator for outputting RF signal; a power divider, configured to receive the radio frequency signal output by the analog swept frequency oscillator and divide the radio frequency signal into two signals, output 1 and output 2, wherein output 2 serves as the signal output of the entire signal source; A mixer, configured to receive the output 1 signal and perform frequency conversion on the output 1 signal to obtain a frequency-converted output 1 signal; A receiver, for receiving the frequency-converted output 1 signal; The frequency conversion operation is to make the output 1 signal after frequency conversion fall within the frequency range that the receiver can receive; The processor is configured to control the operating frequency of the receiver and read the signal strength received by the receiver in real time, obtain a swept frequency output frequency of the analog swept frequency oscillator based on the signal strength, and output two analog voltages through a digital / analog converter based on the swept frequency output frequency to adjust the center frequency and swept frequency bandwidth of the analog swept frequency oscillator respectively until the center frequency and swept frequency bandwidth of the signal source output signal meet the set range.

[0010] Furthermore, output 1 and output 2 are two signals with the same content.

[0011] The present invention also proposes a computer-readable storage medium, which stores a computer program. When the computer program is executed by a processor, it implements the steps of the control method of a high-stability UAV interference signal source.

[0012] The beneficial effects of the present invention are: The present invention proposes a high-stability UAV interference signal source and a control method thereof. Through the closed-loop control principle, a universal receiver, a processor and a digital / analog conversion device are used to monitor the frequency and bandwidth parameters of a conventional analog swept-frequency signal source in real time. The analog voltage output by the digital / analog conversion device is used to control the frequency and bandwidth of the analog swept-frequency signal source, thereby performing real-time correction on the working state of the analog swept-frequency signal source, thereby achieving short-term and long-term stability of its working state. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] The above and other features of the present disclosure will become more apparent through a detailed description of the embodiments shown in conjunction with the accompanying drawings. The same reference numerals in the drawings of the present disclosure represent the same or similar elements. Obviously, the drawings described below are only some embodiments of the present disclosure. It is possible for a person skilled in the art to derive other drawings based on these drawings without inventive effort. In the drawings: Figure 1 Shown is the first part of a flow chart of a method for controlling a high-stability UAV jamming signal source according to the present invention; Figure 2 The second part of the flowchart of the control method of a high-stability UAV interference signal source of the present invention is shown. Figure 3 The figure shows a structural principle block diagram of a high-stability UAV jamming signal source of the present invention; Figure 4 Shown is a schematic diagram of the principle of using digitally synthesized radio frequency signals mentioned in the background technology of the present invention. DETAILED DESCRIPTION

[0014] The following will be combined with the embodiments and drawings to clearly and completely describe the concept, specific structure and technical effects of the present invention so as to fully understand the purpose, scheme and effect of the present invention. It should be noted that the embodiments and features in the embodiments of this application can be combined with each other unless there is a conflict. The same reference numerals used throughout the drawings indicate the same or similar parts.

[0015] Reference Figure 1 as well as Figure 2 In Example 1, the present invention proposes a method for controlling a high-stability UAV interference signal source, comprising the following steps: Step 110: Set the receiver frequency to the starting frequency; Step 120: Determine whether the current receiver frequency reaches the termination frequency. If the current receiver frequency does not reach the termination frequency, increase the receiver frequency by a preset step size until the current receiver frequency reaches the termination frequency. Step 130: Calculate the spectrum center frequency corresponding to the end frequency, and adjust the spectrum center frequency to within the frequency error range based on the center frequency control voltage. If the spectrum center frequency is already within the frequency error range, no adjustment is required, thereby obtaining a qualified spectrum center frequency. Step 140: Calculate the spectrum bandwidth corresponding to the qualified spectrum center frequency, and control the spectrum bandwidth within a bandwidth error range based on the spectrum bandwidth control voltage. If the spectrum bandwidth is already within the bandwidth error range, no adjustment is required, and the qualified spectrum bandwidth is obtained. Repeat the above steps 110 to 140.

[0016] In this embodiment 1, the frequency and bandwidth parameters of a conventional analog swept-frequency signal source are monitored in real time, and the frequency and bandwidth of the analog swept-frequency signal source are controlled by outputting an analog voltage through a digital / analog conversion device, thereby performing real-time correction on the working state of the analog swept-frequency signal source, thereby achieving short-term and long-term stability of its working state.

[0017] As a preferred embodiment of the present invention, specifically, step 130 includes: Step 131: determine whether the spectrum center frequency is within the frequency error range. Step 132: If yes, directly use the current spectrum center frequency as the qualified spectrum center frequency without adjustment; if no, further determine whether the spectrum center frequency is too high; Step 133: If the center frequency is too high, reduce the center frequency control voltage; if the center frequency is not too high, increase the center frequency control voltage. Repeat steps 131 to 133 until a qualified spectrum center frequency is obtained.

[0018] In this preferred embodiment, by adjusting the spectrum center frequency in the above manner, it is possible to ensure that a qualified spectrum center frequency is obtained.

[0019] As a preferred embodiment of the present invention, specifically, step 140 includes: Step 141: Determine whether the spectrum bandwidth is within the bandwidth error range. Step 142: If yes, directly use the current spectrum bandwidth as the qualified spectrum bandwidth without adjustment; if no, further determine whether the spectrum bandwidth is too large; Step 143: If the value is too large, then the spectrum width control voltage is reduced; if the value is not too large, then the spectrum width control voltage is increased. Repeat steps 141 to 143 until a qualified spectrum bandwidth is obtained.

[0020] In this preferred embodiment, by adjusting the spectrum bandwidth in the above manner, it is possible to ensure that a qualified spectrum bandwidth is obtained.

[0021] Reference Figure 3 , Example 2, the present invention also proposes a high-stability UAV interference signal source, comprising: Analog swept frequency oscillator for outputting RF signal; a power divider, configured to receive the radio frequency signal output by the analog swept frequency oscillator and divide the radio frequency signal into two signals, output 1 and output 2, wherein output 2 serves as the signal output of the entire signal source; A mixer, configured to receive the output 1 signal and perform frequency conversion on the output 1 signal to obtain a frequency-converted output 1 signal; A receiver, for receiving the frequency-converted output 1 signal; The frequency conversion operation is to make the output 1 signal after frequency conversion fall within the frequency range that the receiver can receive; The processor is configured to control the operating frequency of the receiver and read the signal strength received by the receiver in real time, obtain a swept frequency output frequency of the analog swept frequency oscillator based on the signal strength, and output two analog voltages through a digital / analog converter based on the swept frequency output frequency to adjust the center frequency and swept frequency bandwidth of the analog swept frequency oscillator respectively until the center frequency and swept frequency bandwidth of the signal source output signal meet the set range.

[0022] In this embodiment 2, the analog swept frequency oscillator 1 is a core component of a signal source commonly used at present, which is composed of a voltage-controlled oscillator and peripheral circuits. It generally has two voltage control ports, "frequency adjustment" and "bandwidth adjustment", which are used to adjust the center frequency and scanning bandwidth of the signal output by the oscillator respectively. Among them, output 1 and output 2 are two signals with the same content.

[0023] The RF signal output by the analog swept frequency oscillator is divided into two signals after passing through the power divider 2, one of which is used as the signal output of the entire signal source, and the other is converted to the receiving frequency range of the RF receiver 4 after passing through the mixer 3.

[0024] Processor 5 controls the operating frequency of RF receiver 4 and reads the receiver's received signal strength in real time, thereby determining the sweep output frequency range of analog swept frequency oscillator 1. If, for various reasons, the sweep output frequency of analog swept frequency oscillator 1 falls outside the set range, processor 5 outputs two appropriate analog voltages via digital-to-analog converter 6 to adjust the center frequency and sweep bandwidth of analog swept frequency oscillator 1 until the output signal's center frequency and sweep bandwidth fall within the set range.

[0025] In the above working principle, the output frequency and bandwidth parameters of the analog swept frequency oscillator 1 are controlled from the output signal of the analog swept frequency oscillator 1 to the output voltage of the digital / analog converter 6, forming a complete closed control loop, thereby constituting a closed-loop control system.

[0026] In the above working principle, the frequency and bandwidth of the signal source output signal eventually tend to be stable, and the output of the signal source signal can be kept stable under various unstable factors. The final stability depends only on the measurement accuracy of the RF receiver 4. The accuracy of the RF receiver 4 is usually on the order of 10E-6, and the stability is much higher than that of traditional analog solutions and signal sources using temperature compensation solutions.

[0027] The present invention also proposes a computer-readable storage medium, which stores a computer program. When the computer program is executed by a processor, it implements the steps of the control method of a high-stability UAV interference signal source.

[0028] The modules described as separate components may or may not be physically separate, and the components shown as modules may or may not be physical modules, that is, they may be located in one place or distributed across multiple network modules. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution in this embodiment.

[0029] In addition, the functional modules in various embodiments of the present invention may be integrated into a single processing module, or each module may exist physically separately, or two or more modules may be integrated into a single module. The aforementioned integrated modules may be implemented in the form of hardware or software functional modules.

[0030] If the integrated module is implemented in the form of a software functional module and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the present invention implements all or part of the process in the above-mentioned embodiment method, and can also be completed by instructing the relevant hardware through a computer program. The computer program can be stored in a computer-readable storage medium, and the computer program can implement the steps of the above-mentioned various method embodiments when executed by the processor. Among them, the computer program includes computer program code, and the computer program code can be in source code form, object code form, executable file or some intermediate form. The computer-readable medium may include: any entity or system that can carry the computer program code, recording medium, U disk, mobile hard disk, magnetic disk, optical disk, computer memory, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), electrical carrier signal, telecommunication signal and software distribution medium, etc.

[0031] Although the present invention has been described in considerable detail and with particularity with respect to several described embodiments, it is not intended to be limited to any of these details or embodiments or any particular embodiment, but rather should be construed as providing a broad possible interpretation of these claims in view of the prior art by reference to the appended claims, thereby effectively encompassing the intended scope of the invention. In addition, the invention has been described above in terms of embodiments foreseen by the inventors for the purpose of providing a useful description, and those insubstantial modifications of the invention that are not currently foreseen may still represent equivalent modifications of the invention.

[0032] The above description is merely a preferred embodiment of the present invention. The present invention is not limited to the above-described embodiments. As long as the technical effects of the present invention are achieved by the same means, they shall fall within the scope of protection of the present invention. Within the scope of protection of the present invention, various modifications and variations of the technical solutions and / or implementation methods may be made.

Claims

1. A method for controlling a high-stability UAV interference signal source, characterized in that: These include: Step 110: Set the receiver frequency to the starting frequency; Step 120: Determine whether the current receiver frequency reaches the termination frequency. If the current receiver frequency does not reach the termination frequency, increase the receiver frequency by a preset step size until the current receiver frequency reaches the termination frequency. Step 130: Calculate the spectrum center frequency corresponding to the end frequency, and adjust the spectrum center frequency to within the frequency error range based on the center frequency control voltage. If the spectrum center frequency is already within the frequency error range, no adjustment is required, thereby obtaining a qualified spectrum center frequency. Step 140: Calculate the spectrum bandwidth corresponding to the qualified spectrum center frequency, and control the spectrum bandwidth within a bandwidth error range based on the spectrum bandwidth control voltage. If the spectrum bandwidth is already within the bandwidth error range, no adjustment is required, and the qualified spectrum bandwidth is obtained. Repeat the above steps 110 to 140.

2. The control method of a high-stability UAV interference signal source according to claim 1 is characterized in that: Specifically, the step 130 includes: Step 131: determine whether the spectrum center frequency is within the frequency error range. Step 132: If yes, directly use the current spectrum center frequency as the qualified spectrum center frequency without adjustment; if no, further determine whether the spectrum center frequency is too high; Step 133: If the center frequency is too high, reduce the center frequency control voltage; if the center frequency is not too high, increase the center frequency control voltage. Repeat steps 131 to 133 until a qualified spectrum center frequency is obtained.

3. The control method of a high-stability UAV interference signal source according to claim 1, characterized in that: Specifically, the step 140 includes: Step 141: Determine whether the spectrum bandwidth is within the bandwidth error range. Step 142: If yes, directly use the current spectrum bandwidth as the qualified spectrum bandwidth without adjustment; if no, further determine whether the spectrum bandwidth is too large; Step 143: If the value is too large, then the spectrum width control voltage is reduced; if the value is not too large, then the spectrum width control voltage is increased. Repeat steps 141 to 143 until a qualified spectrum bandwidth is obtained.

4. A high-stability UAV interference signal source, characterized in that: include: Analog swept frequency oscillator for outputting RF signal; a power divider, configured to receive the radio frequency signal output by the analog swept frequency oscillator and divide the radio frequency signal into two signals, output 1 and output 2, wherein output 2 serves as the signal output of the entire signal source; A mixer, configured to receive the output 1 signal and perform frequency conversion on the output 1 signal to obtain a frequency-converted output 1 signal; A receiver, for receiving the frequency-converted output 1 signal; The frequency conversion operation is to make the output 1 signal after frequency conversion fall within the frequency range that the receiver can receive; The processor is configured to control the operating frequency of the receiver and read the signal strength received by the receiver in real time, obtain a swept frequency output frequency of the analog swept frequency oscillator based on the signal strength, and output two analog voltages through a digital / analog converter based on the swept frequency output frequency to adjust the center frequency and swept frequency bandwidth of the analog swept frequency oscillator respectively until the center frequency and swept frequency bandwidth of the signal source output signal meet the set range.

5. A high-stability UAV jamming signal source according to claim 4, characterized in that: Specifically, output 1 and output 2 are two signals with the same content.

6. A computer-readable storage medium storing a computer program, wherein: When the computer program is executed by a processor, the steps of the method according to any one of claims 1 to 3 are implemented.

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