A multi-mode noise jamming signal generation method and system

Abstract

The present application relates to a kind of multi-mode noise interference signal generation method, belong to signal interference technical field, solve the problem that existing cannot dynamically flexibly generate the interference signal of multiple modulation modes and the high development complexity.For method includes: according to noise kind and interference mode, obtain first noise sequence, second noise sequence, third noise sequence, noise interference bandwidth and center frequency;Carrier signal is generated based on center frequency;First noise sequence and noise interference bandwidth are passed into first multiplier, then the output result and carrier signal are passed into adder, and first complex signal is output by direct digital synthesizer;First complex signal and second noise sequence are passed into complex multiplier, and second complex signal is output;Second complex signal and third noise sequence are passed into second multiplier, and noise interference signal is output.The generation of multi-mode noise interference signal dynamically flexibly is realized.

Description

Technical Field

[0001] This invention relates to the field of signal interference technology, and in particular to a method and system for generating multi-mode noise interference signals. Background Technology

[0002] In complex electromagnetic environments, a single type of suppressive jamming signal cannot effectively counter diverse threats. Generating multiple suppressive jamming signals is crucial for improving the system's anti-jamming capability.

[0003] With the development of the integrated circuit industry, many interference patterns can be efficiently implemented using FPGAs. However, the traditional code development process is cumbersome, especially when the number of module signals is too large, which increases the complexity of writing code, making it difficult to find problems and maintain the code later. At the same time, it cannot perform convenient real-time functional simulation, which increases the software development cycle.

[0004] Furthermore, there is a lack of existing solutions for generating multiple modes of interference signals through flexible and dynamic modulation methods without changing the program. Summary of the Invention

[0005] Based on the above analysis, the embodiments of the present invention aim to provide a multi-mode noise interference signal generation method and system to solve the problems of existing methods that cannot dynamically and flexibly generate interference signals with multiple modulation modes and have high development complexity.

[0006] On one hand, embodiments of the present invention provide a multi-mode noise interference signal generation method, comprising the following steps:

[0007] Based on the noise type and interference mode, obtain the first noise sequence, the second noise sequence, the third noise sequence, the noise interference bandwidth, and the center frequency; generate a carrier signal based on the center frequency;

[0008] The first noise sequence and noise interference bandwidth are fed into the first multiplier, and then the output result and carrier signal are fed into the adder, and finally the first complex signal is output through the direct digital synthesizer.

[0009] The first complex signal and the second noise sequence are fed into the complex multiplier, and the second complex signal is output.

[0010] The second complex signal and the third noise sequence are fed into the second multiplier, and the noise interference signal is output.

[0011] Based on further improvements to the above methods, the noise types include: Gaussian noise, pseudo-random noise, and uniform noise.

[0012] Based on further improvements to the above method, the interference mode is composed of a combination of bandwidth type, modulation type, and frequency change type; the bandwidth type includes narrowband and wideband; the modulation type includes frequency modulation, phase modulation, amplitude modulation, and combined modulation; the frequency change type includes frequency sweep and fixed frequency.

[0013] Based on further improvements to the above methods, the interference modes include: fixed-frequency narrowband frequency modulation, fixed-frequency narrowband phase modulation, fixed-frequency narrowband amplitude modulation, fixed-frequency narrowband combined modulation, fixed-frequency wideband frequency modulation, fixed-frequency wideband phase modulation, fixed-frequency wideband amplitude modulation, fixed-frequency wideband combined modulation, swept-frequency narrowband frequency modulation, swept-frequency narrowband phase modulation, swept-frequency narrowband amplitude modulation, and swept-frequency narrowband combined modulation.

[0014] Based on further improvements to the above method, when the modulation type in the interference mode is frequency modulation or combined modulation, the first noise sequence is a noise sequence generated according to the noise type; otherwise, it is a fixed value sequence.

[0015] Based on further improvements to the above method, when the modulation type in the interference mode is phase modulation or combined modulation, the second noise sequence is a noise sequence generated according to the noise type; otherwise, it is a fixed value sequence.

[0016] Based on further improvements to the above method, when the modulation type in the interference mode is amplitude modulation or combined modulation, the third noise sequence is a noise sequence generated according to the noise type; otherwise, it is a fixed value sequence.

[0017] Based on further improvements to the above method, the direct digital synthesizer also outputs a flag indicating whether it is valid, which serves as an enable signal for the complex multiplier.

[0018] Based on the further improvement of the above method, the multiplier also outputs a flag indicating whether it is valid, which serves as the enable signal for the second multiplier.

[0019] On the other hand, embodiments of the present invention provide a multi-mode noise interference signal generation system, comprising:

[0020] The host computer is used to acquire the first noise sequence, the second noise sequence, the third noise sequence, the noise interference bandwidth, and the center frequency according to the selected noise type and interference mode; generate a carrier signal based on the center frequency and send it to the frequency modulation module along with the first noise sequence; send the second noise sequence to the phase modulation module; and send the third noise sequence to the amplitude modulation module.

[0021] The frequency modulation module is used to input the first noise sequence and noise interference bandwidth sent by the host computer into the first multiplier, and then input the output result and the carrier signal sent by the host computer into the adder. After that, the first complex signal is output through the direct digital synthesizer and transmitted to the phase modulation module.

[0022] The phase modulation module is used to input the first complex signal sent by the frequency modulation module and the second noise sequence sent by the host computer into the complex multiplier, output the second complex signal and send it to the amplitude modulation module;

[0023] The amplitude modulation module is used to input the second complex signal sent by the phase modulation module and the third noise sequence sent by the host computer into the second multiplier and output the noise interference signal.

[0024] Compared with the prior art, the present invention can achieve at least one of the following beneficial effects:

[0025] 1. It offers a variety of noise types and interference modes to choose from. Depending on the selection result and the control input parameters, it can dynamically perform one or more of the following signal modulations: frequency modulation, phase modulation, and amplitude modulation, thereby generating different interference signals. No program modification is required. It is dynamic, flexible, and easy to operate, greatly increasing the scope of application scenarios.

[0026] 2. It is built in a modular way, with rich and independent external interfaces, high development efficiency and a simple and efficient development process. The high degree of modularity makes it easy to modify and maintain the implementation process in the future.

[0027] In this invention, the above-described technical solutions can be combined with each other to achieve more preferred combinations. Other features and advantages of this invention will be set forth in the following description, and some advantages may become apparent from the description or be learned by practicing the invention. The objects and other advantages of this invention can be realized and obtained from what is particularly pointed out in the description and drawings. Attached Figure Description

[0028] The accompanying drawings are for illustrative purposes only and are not intended to limit the invention. Throughout the drawings, the same reference numerals denote the same parts.

[0029] Figure 1 This is a flowchart of a multi-mode noise interference signal generation method according to Embodiment 1 of the present invention;

[0030] Figure 2 This is a schematic diagram of a multi-mode noise interference signal generation system according to Embodiment 2 of the present invention. Detailed Implementation

[0031] Preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings, which form part of this application and are used together with the embodiments of the present invention to illustrate the principles of the present invention, but are not intended to limit the scope of the present invention.

[0032] Example 1

[0033] A specific embodiment of the present invention discloses a method for generating multi-mode noise interference signals, such as... Figure 1 As shown, it includes the following steps:

[0034] S1. Based on the noise type and interference mode, obtain the first noise sequence, the second noise sequence, the third noise sequence, the noise interference bandwidth, and the center frequency; generate a carrier signal based on the center frequency;

[0035] S2. The first noise sequence and noise interference bandwidth are fed into the first multiplier, and the output result and carrier signal are fed into the adder. The first complex signal is then output through the direct digital synthesizer.

[0036] S3. Input the first complex signal and the second noise sequence into the complex multiplier and output the second complex signal;

[0037] S4. Input the second complex signal and the third noise sequence into the second multiplier and output the noise interference signal.

[0038] During implementation, frequency, phase, and amplitude modulation processes are sequentially connected. Based on the selected noise type and interference mode, different input parameters are controlled to generate corresponding noise interference signals. The development process is simple and efficient, and the interference mode control is flexible.

[0039] Specifically, the noise types in step S1 include: Gaussian noise, pseudo-random noise, and uniform noise. Gaussian noise is generated using the randn or wgn functions in MATLAB to produce a noise sequence that conforms to a Gaussian distribution; uniform noise is generated using the rand function in MATLAB; pseudo-random noise usually refers to random noise with some kind of regularity, which can be generated by the linear feedback shift register algorithm, or by first generating uniform noise and then converting it appropriately to obtain pseudo-random noise.

[0040] Preferably, noise sequences of various noise types are pre-generated and stored in a read-only memory (ROM).

[0041] Furthermore, the interference mode is composed of a combination of bandwidth type, modulation type, and frequency change type; bandwidth type includes narrowband and wideband; modulation type includes frequency modulation, phase modulation, amplitude modulation, and combined modulation; frequency change type includes frequency sweep and fixed frequency.

[0042] Specifically, the interference modes include: fixed-frequency narrowband frequency modulation, fixed-frequency narrowband phase modulation, fixed-frequency narrowband amplitude modulation, fixed-frequency narrowband combined modulation, fixed-frequency wideband frequency modulation, fixed-frequency wideband phase modulation, fixed-frequency wideband amplitude modulation, fixed-frequency wideband combined modulation, swept-frequency narrowband frequency modulation, swept-frequency narrowband phase modulation, swept-frequency narrowband amplitude modulation, and swept-frequency narrowband combined modulation.

[0043] In other words, different noise interference signals are generated by selecting different interference modes. For example, the fixed-frequency narrowband frequency modulation mode corresponds to the noise interference signal obtained by applying a narrowband noise interference bandwidth to a noise sequence corresponding to a noise type and then frequency-modulating a carrier signal with a fixed center frequency; the fixed-frequency wideband combined modulation mode corresponds to the noise interference signal obtained by applying a wideband noise interference bandwidth to a noise sequence corresponding to a noise type and then sequentially frequency, phase, and amplitude modulating a carrier signal with a fixed center frequency using a separate noise sequence; the swept-frequency narrowband phase modulation mode corresponds to the noise interference signal obtained by applying a narrowband noise interference bandwidth to a noise sequence corresponding to a noise type and then phase-modulating a carrier signal with a changing center frequency.

[0044] After determining whether the center frequency is fixed or variable, a carrier signal is generated using pulse frequency modulation.

[0045] It should be noted that step S2 is used to frequency modulate the carrier signal, including: inputting the first noise sequence and the noise interference bandwidth into the first multiplier, that is, multiplying the first noise sequence with the noise interference bandwidth, which means limiting the bandwidth of the first noise sequence to make it a noise signal within a specific bandwidth; then inputting it and the carrier signal into the adder, which means adding the frequency of the noise sequence with the applied bandwidth limitation to the center frequency of the carrier signal; finally, using a direct digital synthesizer (DDS) to generate the frequency-modulated first complex signal; the first complex signal includes 8 real part I signals and 8 imaginary part Q signals.

[0046] It is worth noting that when the modulation type in the interference mode is frequency modulation or combined modulation, the first noise sequence is a noise sequence generated according to the noise type; when the modulation type in the interference mode is neither frequency modulation nor combined modulation, it means that no frequency modulation is required, and the first noise sequence is a fixed value sequence.

[0047] Preferably, the direct digital synthesizer also outputs a validity flag as an enable signal for the complex multiplier. That is, when the validity flag is 1, it indicates that the complex multiplier in step S3 can be used.

[0048] Step S3 is sequential with step S2. The first complex signal output from step S2 is received, carrying the signal frequency. In step S3, the first complex signal is phase-modulated using the second noise sequence, including: using a complex multiplier, i.e., a complex multiplier, to multiply the first complex signal and the second noise sequence, using the second noise sequence as the modulation signal, so that the phase of the first complex signal changes with the modulation signal, to obtain the phase-modulated second complex signal; the second complex signal also includes 8 I signals and 8 Q signals.

[0049] It is worth noting that when the modulation type in the interference mode is phase modulation or combined modulation, the second noise sequence is a noise sequence generated according to the noise type; when the modulation type in the interference mode is neither phase modulation nor combined modulation, the second noise sequence is a fixed value sequence. In this case, it only causes a fixed phase shift and does not modulate the phase of the first complex signal. This method can output the interference signal according to the selected interference mode without affecting the noise interference signal generation process.

[0050] Preferably, the multiplier also outputs a validity flag as an enable signal for the second multiplier in step S4. That is, when the validity flag is 1, it indicates that the multiplier is valid and the second multiplier in step S4 can be used.

[0051] It should be noted that step S4 is sequential with step S3. Step S4 receives the second complex signal output from step S3, which carries the signal frequency and phase. Step S4 uses a third noise sequence to perform amplitude modulation on the second complex signal, including: using a second multiplier to multiply the second complex signal and the third noise sequence, using the third noise sequence as the modulation signal, so that the amplitude of the second complex signal changes with the modulation signal, and thus obtains the amplitude-modulated noise interference signal. The noise interference signal also includes 8 I signals and 8 Q signals.

[0052] It is worth noting that when the modulation type in the interference mode is amplitude modulation or combined modulation, the third noise sequence is a noise sequence generated according to the noise type; when the modulation type in the interference mode is not amplitude modulation or combined modulation, the third noise sequence is a fixed value sequence. In this case, a fixed amplitude is simply superimposed on the amplitude of the second complex signal, and amplitude modulation is not performed on the second complex signal.

[0053] Preferably, the second multiplier also outputs a valid flag to indicate whether the noise interference signal was successfully generated.

[0054] It should be noted that, to improve development efficiency and enhance program modularity, the method in this embodiment can be implemented based on the System Generator platform. The System Generator platform is a design tool that utilizes the Simulink development environment within MATLAB to complete FPGA development. It provides a rich set of basic computational modules, including the first multiplier, adder, direct digital synthesizer, complex multiplier, and second multiplier used in steps S2-S4. After co-simulation with MATLAB at each step, the IP core can be generated and exported, thus enabling its use in the FPGA project.

[0055] Compared with the prior art, the multi-mode noise interference signal generation method provided in this embodiment offers a selection of multiple noise types and interference modes. Based on the selection result, the input parameters are controlled to dynamically perform one or more of frequency modulation, phase modulation, and amplitude modulation, thereby generating different interference signals. No program modification is required, making it dynamic, flexible, and easy to operate, which greatly increases the scope of application scenarios.

[0056] Example 2

[0057] Another embodiment of the present invention discloses a multi-mode noise interference signal generation system, thereby implementing the multi-mode noise interference signal generation method in Embodiment 1. The specific implementation of each module is described in the corresponding description in Embodiment 1. Figure 2 As shown, the system includes:

[0058] The host computer is used to acquire the first noise sequence, the second noise sequence, the third noise sequence, the noise interference bandwidth, and the center frequency according to the selected noise type and interference mode; generate a carrier signal based on the center frequency and send it to the frequency modulation module along with the first noise sequence; send the second noise sequence to the phase modulation module; and send the third noise sequence to the amplitude modulation module.

[0059] The frequency modulation module is used to input the first noise sequence and noise interference bandwidth sent by the host computer into the first multiplier, and then input the output result and the carrier signal sent by the host computer into the adder. After that, the first complex signal is output through the direct digital synthesizer and transmitted to the phase modulation module.

[0060] The phase modulation module is used to input the first complex signal sent by the frequency modulation module and the second noise sequence sent by the host computer into the complex multiplier, output the second complex signal and send it to the amplitude modulation module;

[0061] The amplitude modulation module is used to input the second complex signal sent by the phase modulation module and the third noise sequence sent by the host computer into the second multiplier and output the noise interference signal.

[0062] It should be noted that the frequency modulation module, phase modulation module, and amplitude modulation module are all constructed in a modular manner and have rich and independent external interfaces.

[0063] Specifically, the inputs of the frequency modulation module include: a first noise sequence, noise interference bandwidth, and a carrier signal, and the outputs are 8 I signals and 8 Q signals of the first complex signal, as well as a valid flag.

[0064] The inputs to the phase modulation module include: a second noise sequence, eight I signals and eight Q signals of the first complex signal, and an enable signal; the outputs are eight I signals and eight Q signals of the second complex signal, and a flag indicating whether it is valid.

[0065] The inputs to the amplitude modulation module include: a third noise sequence, eight I-signals and eight Q-signals of the second complex signal, and an enable signal; the outputs are eight I-signals and eight Q-signals of the noise interference signal, and a flag indicating whether it is valid.

[0066] Since the multi-mode noise interference signal generation system in this embodiment and the aforementioned multi-mode noise interference signal generation method are related and can be mutually referenced, this description is redundant and will not be repeated here. Because this system embodiment shares the same principle as the aforementioned method embodiment, it also possesses the corresponding technical effects of the method embodiment. Furthermore, from a system perspective, the modules are sequential, resulting in high development efficiency and a simple, efficient development process. The high degree of modularity facilitates subsequent modification and maintenance of the implementation process.

[0067] Those skilled in the art will understand that all or part of the processes of the methods described in the above embodiments can be implemented by a computer program instructing related hardware, and the program can be stored in a computer-readable storage medium. The computer-readable storage medium may be a disk, optical disk, read-only memory, or random access memory, etc.

[0068] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any changes or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in the present invention should be included within the scope of protection of the present invention.

Claims

1. A method for generating multi-mode noise interference signals, characterized in that, Includes the following steps: Based on the noise type and interference mode, obtain the first noise sequence, the second noise sequence, the third noise sequence, the noise interference bandwidth, and the center frequency; generate a carrier signal based on the center frequency; The first noise sequence and the noise interference bandwidth are fed into the first multiplier, and then the output result and the carrier signal are fed into the adder. Finally, the first complex signal is output through the direct digital synthesizer. The first complex signal and the second noise sequence are fed into a complex multiplier to output the second complex signal; The second complex signal and the third noise sequence are fed into the second multiplier to output a noise interference signal.

2. The multi-mode noise interference signal generation method according to claim 1, characterized in that, The noise types include: Gaussian noise, pseudo-random noise, and uniform noise.

3. The multi-mode noise interference signal generation method according to claim 1, characterized in that, The interference mode is composed of a combination of bandwidth type, modulation type, and frequency change type; the bandwidth type includes narrowband and wideband; the modulation type includes frequency modulation, phase modulation, amplitude modulation, and combined modulation; the frequency change type includes frequency sweep and fixed frequency.

4. The multi-mode noise interference signal generation method according to claim 3, characterized in that, The interference modes include: fixed-frequency narrowband frequency modulation, fixed-frequency narrowband phase modulation, fixed-frequency narrowband amplitude modulation, fixed-frequency narrowband combined modulation, fixed-frequency wideband frequency modulation, fixed-frequency wideband phase modulation, fixed-frequency wideband amplitude modulation, fixed-frequency wideband combined modulation, swept-frequency narrowband frequency modulation, swept-frequency narrowband phase modulation, swept-frequency narrowband amplitude modulation, and swept-frequency narrowband combined modulation.

5. The multi-mode noise interference signal generation method according to claim 3, characterized in that, When the modulation type in the interference mode is frequency modulation or combined modulation, the first noise sequence is a noise sequence generated according to the noise type; otherwise, it is a fixed value sequence.

6. The multi-mode noise interference signal generation method according to claim 3, characterized in that, When the modulation type in the interference mode is phase modulation or combined modulation, the second noise sequence is a noise sequence generated according to the noise type; otherwise, it is a fixed value sequence.

7. The multi-mode noise interference signal generation method according to claim 3, characterized in that, When the modulation type in the interference mode is amplitude modulation or combined modulation, the third noise sequence is a noise sequence generated according to the noise type; otherwise, it is a fixed value sequence.

8. The multi-mode noise interference signal generation method according to claim 1 or 3, characterized in that, The direct digital synthesizer also outputs a valid flag as an enable signal for the multiplier.

9. The multi-mode noise interference signal generation method according to claim 1 or 3, characterized in that, The multiplier also outputs a valid flag as an enable signal for the second multiplier.

10. A multi-mode noise interference signal generation system, characterized in that, include: The host computer is used to acquire a first noise sequence, a second noise sequence, a third noise sequence, a noise interference bandwidth, and a center frequency based on the selected noise type and interference mode; generate a carrier signal based on the center frequency and send it to the frequency modulation module along with the first noise sequence; send the second noise sequence to the phase modulation module; and send the third noise sequence to the amplitude modulation module. The frequency modulation module is used to input the first noise sequence and the noise interference bandwidth sent by the host computer into the first multiplier, and then input the output result and the carrier signal sent by the host computer into the adder. After that, the first complex signal is output through the direct digital synthesizer and transmitted to the phase modulation module. The phase modulation module is used to input the first complex signal sent by the frequency modulation module and the second noise sequence sent by the host computer into the complex multiplier, output the second complex signal and transmit it to the amplitude modulation module; An amplitude modulation module is used to input the second complex signal sent by the phase modulation module and the third noise sequence sent by the host computer into the second multiplier and output a noise interference signal.

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