Airspace countering signal processing method and device based on analog signal source

Abstract

The invention provides an airspace countering signal processing method and device based on an analog signal source, and belongs to the technical field of wireless communication countering. The method comprises the following steps: generating at least two analog signal waves; combining multiple paths of analog signals into one path through a specific resistance network combiner; and modulating the synthesized signal to a target frequency band by using a voltage-controlled oscillator, amplifying, and transmitting through an antenna. A full-analog signal path is adopted, a low-cost chip and an original resistance network combiner are utilized to replace an expensive digital signal source, the problems of high cost and large delay in the prior art are fundamentally solved, real-time, low-cost and high-reliability countering of airspace signals such as an unmanned aerial vehicle FPV is achieved, and the real-time, low-cost and high-reliability countering of the airspace signals such as the unmanned aerial vehicle FPV is achieved. The method has the advantages of being accurate in frequency band adaptation and comprehensive in airspace coverage.

Description

Technical Field

[0001] This invention relates to the fields of wireless communication and electronic countermeasures, specifically to a processing method and apparatus based on an analog signal source for airspace signal countermeasures, which is particularly suitable for interference and countermeasures against UAV FPV signals and illegal airspace communication signals. Background Technology

[0002] In airspace countermeasure scenarios such as drone control, border security, and protection of important locations, effectively interfering with or blocking remote control and image transmission signals of target devices is crucial. Existing technical solutions mainly rely on digital signal sources to generate countermeasure signals. The technical path typically involves: first, generating a preset digital baseband signal using a digital signal processor (DSP) or field-programmable gate array (FPGA), then transmitting it after digital-to-analog conversion (DAC), up-conversion, and power amplification. This approach has inherent drawbacks: firstly, the hardware cost is high, requiring high-performance digital processing chips, large-capacity storage units, and high-speed DACs, resulting in expensive countermeasure equipment; secondly, the digital signal processing flow is complex, involving algorithm execution, data encoding / decoding, and protocol stack processing, inevitably introducing significant signal delays (usually in the millisecond range or even higher), making it difficult to meet the real-time, rapid countermeasure requirements of high-speed moving targets (such as drones), easily leading to countermeasure lag and target signal escape. Therefore, this application proposes an airspace countermeasure signal processing method and apparatus based on an analog signal source that at least partially solves the aforementioned problems. Summary of the Invention

[0003] In view of the aforementioned problems, this application is made to provide a spatial countermeasure signal processing method and apparatus based on an analog signal source that overcomes or at least partially solves the aforementioned problems.

[0004] In a first aspect, the present invention provides a spatial countermeasure signal processing method based on an analog signal source, comprising the following steps: S1. Analog signal wave generation: At least two different types of analog signal waves are generated by analog circuits; the analog signal waves include, but are not limited to, square waves, sine waves and sawtooth waves.

[0005] S2. Analog signal synthesis: The at least two analog signal waves are input to the combiner, and linear superposition and impedance matching are performed through a specific resistor network constructed within the combiner to synthesize a synthesized signal; the specific resistor network structure includes a two-to-one combination structure and a three-to-one combination structure.

[0006] S3. Frequency band modulation and signal amplification: The synthesized signal is input to a voltage-controlled oscillator (VCO). By adjusting the control voltage of the VCO, the synthesized signal is modulated to the operating frequency band of the target device (such as an FPV device) to generate a counter-signal. Subsequently, the counter-signal is input to a power amplifier for power amplification.

[0007] S4. Countermeasure signal transmission: The amplified countermeasure signal is transmitted to the target airspace through the antenna assembly.

[0008] Secondly, the present invention also provides a spatial countermeasure signal processing apparatus based on an analog signal source for implementing the above method, comprising: A signal generation module for generating at least two different types of analog signal waves; it includes a timer chip circuit for generating square waves, a dedicated chip circuit for generating sawtooth waves, and a generation circuit for generating sine waves. The combining module is connected to the signal generation module and has a specific resistor network inside, which is used to combine multiple analog signal waves into a single composite signal; the specific resistor network is selected from a two-to-one resistor network or a three-to-one resistor network. A modulation and amplification module, connected to the combining module, includes a voltage-controlled oscillator (VCO) and a power amplifier; the VCO is used to modulate the synthesized signal to the target frequency band, and the power amplifier is used to amplify the modulated counter signal. The transmitting module, connected to the modulation and amplification module, includes at least one set of antennas for radiating amplified countermeasure signals into the spatial domain.

[0009] In some embodiments of the present invention, the two-to-one resistor network structure is as follows: two resistors with first resistance values ​​are connected in parallel to form a parallel branch. One end of this parallel branch is used to input two analog signal waves, and the other end is connected in series with a second resistance value to serve as the output terminal of the synthesized signal. The first resistance value ranges from 1 to 10 Ω, and the second resistance value ranges from 1 to 5 Ω. The three-to-one resistor network structure is as follows: three resistors with resistance values ​​ranging from 1 to 10 Ω are connected in parallel. One end of each resistor is used to input one analog signal wave, and the other end is connected together to serve as the output terminal of the synthesized signal.

[0010] In some embodiments of the present invention, the VCO is a wideband VCO with an operating frequency covering 100Hz to 6GHz, and can be configured to switch the output frequency band in preset steps (e.g., 200MHz).

[0011] In some embodiments of the present invention, the transmitting module includes at least three sets of directional antennas, each set of directional antennas being evenly distributed at an angle on a horizontal plane to achieve 360° airspace coverage.

[0012] In some embodiments of the present invention, the method further includes step S0: detecting the current operating frequency band of the target spatial signal in real time through an analog detection circuit; in step S3, dynamically adjusting the control voltage of the VCO according to the frequency band result detected in S0, so that the countermeasure signal frequency band tracks the target signal frequency band in real time.

[0013] Compared with the prior art, the embodiments of the present invention have at least the following advantages or beneficial effects: This application abandons expensive digital signal processors and storage units, employing general-purpose, low-cost analog chips (such as NE555 and 5089 chips) and conventional resistor-capacitor components to construct the core signal chain, significantly reducing hardware costs. By completing the entire signal generation, synthesis, and modulation process in the analog domain, it avoids the algorithm delays and encoding / decoding overhead of digital signal processing. The system response time can be controlled at the millisecond or even microsecond level, achieving real-time, rapid countermeasures against high-speed changing signals with excellent real-time performance. The innovative resistor network combiner design, through precise impedance matching, effectively reduces crosstalk and signal reflection during the synthesis of multiple analog signals, resulting in low signal loss (≤5%), high purity, good stability, and stable and reliable signal synthesis. A wideband VCO enables precise modulation of the target frequency band within the 100Hz-6GHz range. Combined with the spatial layout of multiple directional antennas, it ensures both frequency domain targeting and comprehensive spatial coverage, significantly improving the effective countermeasure range and success rate, and achieving high countermeasure efficiency. The device features a modular design, allowing for flexible adaptation to different application scenarios such as close-range precision countermeasures and medium-to-long-range all-domain countermeasures by switching combiner structures, antenna types (omnidirectional / directional), and adjusting amplifier power. It offers excellent versatility and flexibility. Attached Figure Description

[0014] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0015] Figure 1 This is a schematic diagram of the module structure of a spatial countermeasure signal processing device based on an analog signal source provided in one embodiment of this application; Figure 2 This is an oscillation circuit diagram of a spatial countermeasure signal processing method and device based on an analog signal source; Figure 3 This is an integrator structure diagram of a spatial countermeasure signal processing method and device based on an analog signal source; Figure 4This is a schematic diagram of a sine wave generation unit for a spatial countermeasure signal processing method and device based on an analog signal source; Figure 5 This is a schematic diagram of a combiner for a spatial countermeasure signal processing method and device based on an analog signal source. Detailed Implementation

[0016] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0017] like Figure 1 As shown, an embodiment of this application provides a spatial countermeasure signal processing method and apparatus based on an analog signal source, comprising: At least two different analog signal waves are obtained through a signal generation circuit based on a dedicated analog signal generation chip; the analog signal waves include, but are not limited to, square waves, sine waves, and sawtooth waves, wherein square waves are generated by an NE555 chip, sine waves are generated by a dedicated sine wave generation circuit, and sawtooth waves are generated by an 8092 chip.

[0018] The at least two analog signal waves are input into a combiner, and the signals are synthesized through a specific resistor network structure of the combiner to obtain a stable synthesized signal; the combiner includes a two-to-one combiner structure and a three-to-one combiner structure: A combination of two parallel resistors (impedance 1-10Ω) and one series small resistor (impedance 1-5Ω) is used. One end of the two parallel resistors is connected to two analog signals respectively, and the other end is connected to one end of the series small resistor. The other end of the series small resistor outputs the composite signal. Alternatively, three resistors with impedance 1-10Ω are connected in parallel. One end of the three resistors is connected to three analog signals respectively, and the other end is combined to output the composite signal.

[0019] The synthesized signal is input into a VCO (voltage-controlled oscillator), which modulates the synthesized signal to match the operating frequency band of the FPV equipment (100Hz-6GHz, divided into 200M / segment), thus obtaining a countermeasure signal that meets the requirements of airspace countermeasure. The countermeasure signal is then input into a power amplifier for signal power amplification to ensure signal transmission distance and countermeasure effect.

[0020] The antenna assembly transmits an amplified countermeasure signal into the target airspace; the antenna assembly includes an omnidirectional antenna or a directional antenna, wherein the number of directional antennas is at least three groups, and each group of directional antennas is evenly distributed (e.g., arranged at a 120° angle) to achieve omnidirectional coverage of the target airspace.

[0021] At the same time, such as Figure 1 As shown, the present invention also provides a spatial countermeasure signal processing device based on an analog signal source, comprising: Signal generation module 1: Composed of an NE555 chip, an 8092 chip, and a dedicated analog signal generation circuit, used to generate at least two analog signal waves; Combiner Module 2: A combiner employing the above-mentioned two-to-one or three-to-one resistor network structure is used to synthesize analog signal waves; Modulation and amplification module 3: includes a VCO oscillator and a power amplifier. The VCO oscillator is used to modulate the synthesized signal to a specific frequency band of FPV, and the power amplifier is used to amplify the power of the counter signal. Transmitting module 4: includes at least three sets of directional or omnidirectional antennas for transmitting countermeasure signals into the target airspace.

[0022] Signal generation module 1: NE555 timer chip is selected, and external resistors and capacitors are used to form a multivibrator to generate square waves with a frequency of 1-10kHz; 8092 sawtooth wave generation chip is selected to generate sawtooth waves with adjustable slope; an additional sine wave generation circuit is configured to generate sine waves with a frequency of 500Hz-5kHz.

[0023] Combiner Module 2: The two-way combiner uses two 5Ω resistors in parallel and a 2Ω resistor in series; the three-way combiner uses three 5Ω resistors in parallel. The resistors are made of metal film resistors to ensure impedance stability.

[0024] Modulation and amplification module 3: A wideband VCO oscillator covering 100Hz-6GHz is selected. The output frequency band is adjusted by external control voltage, and 30 frequency bands are divided into 200M / s, such as 100Hz-200M, 200M-400M, ..., 5.8GHz-6GHz. The power amplifier uses GaN (gallium nitride) power amplifier chip, with an output power of 10-30W, which meets the requirements of medium and long-range airspace countermeasures.

[0025] Transmitting Module 4: Selects 3 sets of directional antennas, which are log-periodic antennas with a gain ≥12dBi. The three sets of antennas are fixed on the antenna bracket at a 120° angle, covering a horizontal 360° airspace. An omnidirectional antenna (gain ≥8dBi) can be selected for short-range all-area countermeasure scenarios.

[0026] When the signal generation module 1 is activated, the NE555 chip generates a square wave, the 8092 chip generates a sawtooth wave, and the sine wave generation circuit generates a sine wave. The amplitude of the three analog signal waves is adjusted to 0.5-2Vpp.

[0027] A square wave and a sine wave are input into a two-way combiner. After processing by a 5Ω parallel resistor and a 2Ω series resistor, the first synthesized signal is output. Alternatively, a square wave, a sine wave, and a sawtooth wave are input into a three-way combiner. After processing by three 5Ω resistors connected in parallel, the second synthesized signal is output.

[0028] The synthesized signal is input into the VCO oscillator. Based on the operating frequency band of the target FPV device (e.g., 2.4GHz-2.6GHz), the VCO outputs a counter-signal corresponding to the frequency band by adjusting the control voltage. The amplitude of the counter-signal is adjusted to 5-10Vpp.

[0029] The countermeasure signal is input into a GaN power amplifier, amplified to 10-30W, and then transmitted to three sets of directional antennas. The three sets of directional antennas simultaneously transmit the countermeasure signal into the target airspace, forming a 360° countermeasure coverage without blind spots, interfering with the signal reception of the target FPV equipment, and achieving the purpose of airspace countermeasure.

[0030] Precise countermeasures at close range (distance ≤ 500m): An omnidirectional antenna is selected, and a two-way combiner is used to synthesize a square wave combined with a sine wave. The VCO is modulated to the target frequency band, and the power amplifier output power is adjusted to 10W to ensure precise interference and avoid signal redundancy.

[0031] Medium-to-long range full-area countermeasure (distance 500m-3km): Three sets of directional antennas are selected, and three analog signal waves are synthesized by a three-way combiner. The VCO modulates the signal according to the main operating frequency band of the FPV equipment in the target airspace, and the power amplifier output power is adjusted to 20-30W to achieve large-area full-coverage countermeasure.

[0032] The following will further describe a spatial countermeasure signal processing method and apparatus based on an analog signal source in this exemplary embodiment.

[0033] Example 1: Reference Figure 1 The spatial countermeasure signal processing device based on the analog signal source in this embodiment mainly includes a signal generation module 1, a combining module 2, a modulation and amplification module 3, and a transmission module 4.

[0034] Signal generation module 1 contains three sub-units: Square wave generation unit 11: A multivibrator (i.e., oscillation circuit) is built using the NE555 timer chip. For the specific circuit, please refer to [reference needed]. Figure 2As shown, by adjusting the external resistors R1 and R2 and the capacitor C1, an adjustable square wave with a frequency of 1-10kHz and an amplitude of 0.5-2Vpp can be generated.

[0035] Sawtooth wave generation unit 12: This unit can use an integrator or a dedicated 5089 chip to build a circuit, generating a sawtooth wave with an adjustable slope. The frequency range matches that of a square wave, and the amplitude can be adjusted to 0.5-2Vpp. Specifically, such as... Figure 3 As shown, a square wave can be converted into a sawtooth wave using an integrator. The square wave is integrated by the integrator circuit to output a triangular wave, which is then processed by an integrator circuit or a low-pass filter to obtain a sine wave. The parameters of the triangular wave are determined by the RC value of the integrator circuit. The amplitude of the triangular wave can be adjusted by adjusting the values ​​of R4 and C4.

[0036] Sine wave generation unit 13: It employs an independent Wien bridge oscillator circuit or converts a square wave via an integrator or low-pass filter circuit. For details on the specific conversion circuit, please refer to [reference needed]. Figure 4 As shown, where Figure 4 'a' stands for integrator (integrating circuit). Figure 4 b is a series-type LC second-order low-pass filter circuit. Figure 4 c. A parallel LC second-order low-pass filter circuit generates a sine wave with a frequency of 500Hz-5kHz and an amplitude of 0.5-2Vpp.

[0037] like Figure 2 As shown, the NE555 outputs a square wave with adjustable duty cycle and frequency via resistors R1, R2, and capacitor C1. R1 and / or R2 can be equipped with adjustable resistors for adjustment. Specifically, the duty cycle is changed by adjusting the resistance of resistor R1. Increasing R1 increases the duty cycle, and decreasing R1 decreases the duty cycle. The duty cycle D = (R1 + R2) / (R1 + 2R2). The frequency is changed by adjusting the resistance of resistor R2. Increasing R2 decreases the frequency, and decreasing R2 increases the frequency. f = 1.44 / (R1 + 2R2)C. In the above formula, the values ​​of both R1 and R2 affect the duty cycle and frequency.

[0038] It should be noted that since the output frequency is independent of the input frequency, and the output frequency needs to be determined during VCO processing, the frequency output issue can be ignored at this position.

[0039] In this embodiment, the combining module 2 adopts a two-way or three-way combined-in-one structure. For example... Figure 5 As shown, specifically as follows Figure 5As shown in Figure a, this structure consists of three 5Ω metal film resistors R311, R312, and R313 connected in parallel, and then connected in series with resistor R314 as the output terminal to a VCO (voltage-controlled oscillator). The input terminals of resistors R311, R312, and R313 are connected to a square wave, a sine wave, and a sawtooth wave, respectively. The output terminals of the three are then converged at a point through resistor R314, serving as the output terminal of the synthesized signal S_out. This structure is simple and enables nearly uniform attenuation of the three input signals, ensuring balanced waveform components in the synthesized signal.

[0040] The modulation and amplification module 3 described above includes a VCO and a power amplifier. The VCO is preferably a broadband voltage-controlled oscillator with an operating frequency range of 100Hz to 6GHz. Internally or externally, a control circuit (such as a DAC or analog potentiometer) divides the entire frequency band into multiple sub-bands spaced at 200MHz intervals (e.g., 100Hz-200MHz, 200MHz-400MHz, …, 5.8GHz-6GHz). The synthesized signal S_out is input to the modulation terminal of the VCO. By changing the control voltage V_ctrl of the VCO, the waveform information carried by S_out can be modulated onto a specified RF carrier, outputting a counter-signal S_jam.

[0041] The power amplifier uses a power amplifier chip based on gallium nitride (GaN) technology. Its input is the countermeasure signal S_jam output from the VCO, and the output power can be adjusted between 10W and 100W to meet the countermeasure requirements at different distances.

[0042] The transmitting module 4 includes three identical directional antennas (such as log-periodic antennas with a gain ≥12dBi). The three antennas are mounted on a bracket and are evenly distributed in pairs at 120° intervals in the horizontal plane, together forming a transmitting array with 360° full coverage in the horizontal direction.

[0043] When the device is started, signal generation module 1 simultaneously generates square wave, sine wave, and sawtooth wave. These three waveform signals are fed into combining module 2, where they are combined through three 5Ω resistors connected in parallel and then through a series resistor network to form a composite signal S_out containing rich spectral components. Based on the pre-detected or preset operating frequency band of the target FPV device (e.g., 2.4GHz-2.6GHz), the control voltage V_ctrl of the VCO is set so that its center frequency falls within this band. The composite signal S_out modulates VCO 31 to obtain a frequency-matched counter-RF signal S_jam. S_jam is amplified to the required power (e.g., 60W) by a power amplifier and then evenly distributed to three sets of directional antennas. The three sets of antennas simultaneously radiate the counter-signal into their respective airspace, forming an omnidirectional signal interference field that effectively interferes with or blocks the normal signal reception of the target device within that airspace.

[0044] Example 2: The main difference between this embodiment and embodiment 1 lies in the configuration of the combining module 2 and the transmitting module 4, in order to adapt to close-range (≤500m) precision countermeasure scenarios.

[0045] Module 2 adopts a two-way-to-one structure, as detailed below. Figure 5 As shown in Figure a, two 5Ω resistors, R301 and R302, are connected at one end to a square wave and a sine wave, respectively. After being connected in parallel, they are connected in series through a 2Ω resistor, R304, to output the synthesized signal. This structure, while synthesizing two signals, uses the small series resistor to further suppress the mutual interference between the signals.

[0046] Transmitter module 4 uses a single omnidirectional antenna (gain ≥8dBi) to replace three directional antennas. The power amplifier's output power is set to 50W. This configuration, while ensuring effective interference against specific target frequency bands, reduces equipment complexity and power consumption, making it suitable for precise and energy-efficient countermeasures against specific small-area airspace.

[0047] Example 3: This embodiment adds a dynamic frequency band tracking function based on embodiment 1. A target signal detection unit (not shown in the figure) is added before the combining module 2. This unit consists of pure analog circuits such as a wideband detector, analog filter, and comparator, and is used to sense the frequency band of the strongest interference signal in the target airspace in real time (within 200MHz accuracy).

[0048] The analog level signal output by the detection unit is directly used as part of the VCO control voltage V_ctrl or as an adjustment reference. When the target signal undergoes frequency hopping, the output of the detection unit changes rapidly, thereby driving the VCO's output frequency band to change accordingly, achieving real-time tracking of the target signal by the countermeasure signal. Since the entire tracking loop is implemented entirely by analog circuitry, its tracking delay can be as low as microseconds, effectively handling high-speed frequency-hopping signals.

[0049] It should be noted that integrators can also convert square waves into sawtooth waves, but an improved integrator with asymmetrical charge / discharge time constants must be used. Adding a fast discharge path controlled by a diode (or analog switch) to a standard integrator is the most classic and efficient method to achieve this conversion. This expands the application of integrators from generating symmetrical triangular waves to generating sawtooth waves for scanning, modulation, and other applications.

[0050] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other.

[0051] Although preferred embodiments of the present application have been described, those skilled in the art, upon learning the basic inventive concept, can make other changes and modifications to these embodiments. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments as well as all changes and modifications falling within the scope of the embodiments of the present application.

[0052] Finally, it should be noted that in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or terminal device that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or terminal device. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or terminal device that includes said element.

[0053] The above provides a detailed description of the spatial countermeasure signal processing method and apparatus based on an analog signal source provided in this application. Specific examples have been used to illustrate the principles and implementation methods of this application. The description of the above embodiments is only for the purpose of helping to understand the method and core ideas of this application. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the ideas of this application. Therefore, the content of this specification should not be construed as a limitation of this application.

Claims

1. A spatial countermeasure signal processing device based on an analog signal source, characterized in that, include: A signal generation module for generating at least two different types of analog signal waves; A combining module is connected to the signal generation module. The combining module has a specific resistor network inside, which is used to combine at least two analog signal waves into a single composite signal. A modulation and amplification module, connected to the combining module, includes a voltage-controlled oscillator and a power amplifier; the voltage-controlled oscillator is used to modulate the synthesized signal to a target frequency band to generate a countermeasure signal, and the power amplifier is used to amplify the power of the countermeasure signal; The transmitting module, connected to the modulation and amplification module, is used to radiate the amplified countermeasure signal into the spatial domain.

2. The apparatus according to claim 1, characterized in that, The signal generation module includes at least two of the following: a timer chip circuit for generating square waves, a dedicated chip circuit for generating sawtooth waves, and a generation circuit for generating sine waves.

3. The apparatus according to claim 1, characterized in that, The specific resistor network is a two-to-one resistor network, and its structure includes: two first-value resistors connected in parallel to form a parallel branch, one end of which is used to access two analog signal waves respectively, and the other end is connected in series through a second-value resistor to serve as the output terminal of the synthesized signal. The first resistance value range is 1-10Ω, and the second resistance value range is 1-5Ω.

4. The apparatus according to claim 1, characterized in that, The specific resistor network is a three-in-one resistor network, the structure of which includes: three resistors with resistance values ​​ranging from 1 to 10 Ω connected in parallel, one end of each resistor is used to connect to one analog signal wave, and the other end is connected together as the output terminal of the synthesized signal.

5. The apparatus according to claim 1, characterized in that, The voltage-controlled oscillator is a wideband voltage-controlled oscillator with an operating frequency range of 100Hz to 6GHz.

6. The apparatus according to claim 1 or 5, characterized in that, The transmitting module includes at least three sets of directional antennas and / or at least one set of omnidirectional antennas, with each set of directional antennas being evenly distributed at an angle on a horizontal plane.

7. The apparatus according to claim 1, characterized in that, It also includes a target signal detection unit, which is connected to the control terminal of the voltage-controlled oscillator and is used to detect the target signal frequency band in real time and output an analog control signal to dynamically adjust the output frequency band of the voltage-controlled oscillator.

8. A spatial countermeasure signal processing method based on an analog signal source, characterized in that, Includes the following steps: Generate at least two different types of analog signal waves; The at least two analog signal waves are input to a combiner and combined through a specific resistor network within the combiner to obtain a composite signal. The synthesized signal is input to a voltage-controlled oscillator for frequency band modulation to generate a countermeasure signal, and the power of the countermeasure signal is amplified. The amplified countermeasure signal is transmitted to the target airspace via an antenna.

9. The method according to claim 8, characterized in that, The specific resistor network is a two-in-one structure or a three-in-one structure; The two-way-to-one structure uses a combination of two parallel resistors and one series small resistor, while the three-way-to-one structure uses three resistors in parallel.

10. The method according to claim 8, characterized in that, Before the frequency band modulation step, the method further includes: detecting the current operating frequency band of the target spatial signal in real time through an analog detection circuit; and dynamically adjusting the control voltage of the voltage-controlled oscillator according to the detection result, so that the frequency band of the generated countermeasure signal tracks the frequency band change of the target spatial signal.

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