A method and system for generating high-quality interference signals
By processing and modulating the noise source, a high-quality interference signal with instantaneous bandwidth is generated, which solves the problem of poor randomness of noise interference in the prior art, and realizes the generation of noise interference signals with good randomness.
Patent Information
- Application Number
- CN202211724982.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- Filing Date
- 2022-12-30
- Publication Date
- 2025-09-02
- Estimated Expiration
- 2042-12-30
AI Technical Summary
The prior art is difficult to generate high-quality interference signals with instantaneous bandwidth, and the randomness of noise interference is poor, making it difficult to simulate noise interference signals that truly obey random distributions.
The design of the noise source generates white noise interference signals in the full frequency band. After filtering, mixing, upconversion and digital downconversion processing, combined with frequency modulation, sweep and convolution processing, RF blocking, frequency modulation, noise + sweep and convolution noise interference signals are generated. The ERA-4 amplifier is cascaded and controlled by fixed attenuators and switch groups to achieve different interference modulation.
It realizes noise interference signals with instantaneous bandwidth. Noise interference follows true random distribution, has good randomness, and can generate high-quality interference signals.
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Figure CN116667877B_ABST
Abstract
Description
Technical Field
[0001] The present invention relates to a method and system for generating high-quality interference signals, and belongs to the technical field of radio frequency simulation. Background Art
[0002] During RF simulation tests, there's often a need to simulate noise interference. The typical approach is to use digital noise to simulate this interference. However, when digital noise is used, it's instantaneously a single frequency point, and the bandwidth must be accumulated. Furthermore, digital noise interference follows a pseudo-random distribution, which is relatively poor in randomness. Therefore, it's difficult to generate high-quality interference signals that truly follow a random distribution. Summary of the Invention
[0003] The technical problem to be solved by the present invention is to overcome the defects of the prior art and provide a high-quality interference signal generation method and system, which can realize noise interference with instantaneous bandwidth, and the noise interference obeys a truly random distribution and has good randomness.
[0004] In order to solve the above technical problems, the technical solution adopted by the present invention is:
[0005] A method for generating an interference signal comprises the following steps:
[0006] The full-band white noise interference signal generated by the noise source is filtered and mixed to obtain an intermediate frequency white noise interference signal;
[0007] The intermediate frequency white noise interference signal is divided into two branches. The white noise interference signal output by one branch is processed by up-conversion to obtain a radio frequency blocking noise interference signal, and the intermediate frequency white noise interference signal output by the other branch is processed by digital down-conversion to obtain a zero intermediate frequency white noise interference signal.
[0008] The zero intermediate frequency white noise interference signal is divided into two branches, one branch is subjected to frequency modulation noise modulation, and the other branch is subjected to noise + swept frequency interference modulation, thereby obtaining a zero intermediate frequency frequency modulation noise interference signal and a noise + swept frequency interference signal respectively;
[0009] The zero-IF frequency-modulated noise interference signal and the noise+sweep-frequency interference signal are divided into two branches. One branch is digitally up-converted to obtain the IF frequency-modulated noise interference signal and the noise+sweep-frequency interference signal, and then up-converted to obtain the RF frequency-modulated noise signal and the noise+sweep-frequency interference signal.
[0010] The RF target signal is received through line feeding or air feeding, and the intermediate frequency RF signal is obtained after down-conversion processing. The intermediate frequency RF signal is then convolved and filtered with the zero intermediate frequency noise interference signal and the other branch of the noise + swept frequency interference signal to obtain the zero intermediate frequency convolution noise interference and the aiming frequency noise interference signal. The digital up-conversion processing is then performed to obtain the intermediate frequency convolution noise interference and the aiming frequency noise interference signal, and the RF convolution noise interference signal and the aiming frequency noise interference signal are then obtained after up-conversion processing.
[0011] The noise source is composed of eight amplifier cascades, and fixed attenuators are set after every two amplifiers in the first six amplifiers.
[0012] The amplifier is an ERA-4 amplifier.
[0013] The last two amplifier stages are controlled by two switch groups.
[0014] The white noise interference signal, the intermediate frequency convolution noise interference signal and the aiming frequency noise interference signal are subjected to SP3T selection before up-conversion processing.
[0015] An interference signal generating system includes a noise source generating module, a frequency mixing and filtering module, an intermediate frequency signal processing module, a down-conversion module, an up-conversion module and a frequency synthesizer module;
[0016] The noise source generation module is used to generate a full-band white noise interference signal and transmit it to the mixing and filtering module;
[0017] The mixing and filtering module is used to receive the white noise interference signal of the full frequency band, and obtain the intermediate frequency white noise interference signal after filtering and mixing. The intermediate frequency white noise interference signal is divided into two branches and transmitted to the up-conversion module and the intermediate frequency signal processing module respectively;
[0018] The down-conversion module is used to down-convert the RF target signal received through line feeding or air feeding to obtain an intermediate frequency RF signal, and transmit it to the intermediate frequency signal processing module;
[0019] The intermediate frequency signal processing module receives an intermediate frequency white noise interference signal and an intermediate frequency radio frequency signal, divides the intermediate frequency white noise interference signal into two branches, one branch performs frequency modulation noise modulation, and the other branch performs noise + swept frequency interference modulation to obtain a zero intermediate frequency frequency modulation noise interference signal and a noise + swept frequency interference signal, respectively; then the zero intermediate frequency frequency modulation noise interference signal and the noise + swept frequency interference signal are divided into two branches, one branch is digitally up-converted to obtain an intermediate frequency frequency modulation noise interference signal and a noise + swept frequency interference signal, and then subjected to up-conversion processing to obtain a radio frequency frequency modulation noise signal and a noise + swept frequency interference signal; then the intermediate frequency radio frequency signal is convolved with the other branch of the zero intermediate frequency noise interference signal and the noise + swept frequency interference signal, and filtered to obtain a zero intermediate frequency convolution noise interference and an aiming frequency noise interference signal; then digital up-conversion processing is performed to obtain an intermediate frequency convolution noise interference and an aiming frequency noise interference signal; finally, the frequency modulation noise interference signal, the noise + swept frequency interference signal, the intermediate frequency convolution noise interference and the aiming frequency noise interference signal are transmitted to the up-conversion module;
[0020] The frequency synthesis module is used to generate a frequency synthesis local oscillator signal and transmit it to the up-conversion module and the down-conversion module, and to generate a reference clock / working clock signal and transmit it to the intermediate frequency signal processing module;
[0021] The up-conversion module is used to receive an intermediate frequency white noise interference signal, a frequency modulation noise interference signal, a noise+sweep frequency interference signal, an intermediate frequency convolution noise interference signal, and an aiming frequency noise interference signal, and perform up-conversion processing to obtain a radio frequency blocking noise interference signal, a radio frequency frequency modulation noise signal, a noise+sweep frequency interference signal, a radio frequency convolution noise interference signal, and an aiming frequency noise interference signal.
[0022] The beneficial effects of the present invention are as follows: the present invention provides a high-quality interference signal generation method and system, which can realize various noise-type interferences by designing an analog noise source and designing different interference modulations and gating links based on the noise source, including RF blocking noise interference signals, RF frequency modulation noise signals, noise + swept frequency interference signals, RF convolution noise interference signals and aiming frequency noise interference signals, and can generate noise interference signals with instantaneous bandwidth (continuously adjustable bandwidth), and the noise interference obeys a truly random distribution, has good randomness, and can obtain a truly high-quality interference signal. BRIEF DESCRIPTION OF THE DRAWINGS
[0023] Figure 1 It is a flow chart of a method for generating a high-quality interference signal according to the present invention;
[0024] Figure 2 This is a block diagram of the noise source implementation principle in the present invention;
[0025] Figure 3It is a block diagram of a high-quality interference signal generating system of the present invention. DETAILED DESCRIPTION
[0026] The present invention will be further described below in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solutions of the present invention and are not intended to limit the scope of protection of the present invention.
[0027] like Figure 1 As shown, the present invention discloses a high-quality interference signal generation method, which generates a full-band white noise signal through a noise source module, filters out the white noise signal in the required frequency range through an intermediate frequency filter, and directly up-converts the filtered white noise signal through an up-conversion module to output as a blocking noise interference signal; it can also enter the FPGA through AD sampling to modulate the interference characteristics, generating interference patterns such as noise + sweep frequency combination interference based on white noise, frequency modulation noise interference, convolution noise interference, and aiming frequency noise interference. Specifically, it includes the following steps:
[0028] Step 1: Design the noise source. The noise source is achieved by amplifying the thermal noise inside the noise amplifier / generating a full-band white noise interference signal through the noise source, and then obtaining an intermediate frequency white noise interference signal through a switching filter group and mixing. The intermediate frequency white noise interference signal has a frequency of 800 MHz and a bandwidth of 5 MHz to 1 GHz, which is adjustable in steps.
[0029] Step 2: The obtained intermediate frequency white noise interference signal is divided into two branches through SP2T. One branch is selected and output by SP3T and then up-converted to obtain a RF blocking noise interference signal. The other branch outputs an intermediate frequency white noise interference signal of 800MHz with a bandwidth of 5MHz to 1GHz. After inputting the AD, it is digitally down-converted to zero intermediate frequency to obtain a zero intermediate frequency white noise interference signal.
[0030] Step 3: The zero intermediate frequency white noise interference signal passes through SP2T, one branch is used for FM noise modulation, and the other branch is used for noise + swept frequency interference modulation, to obtain a zero intermediate frequency FM noise interference signal and a noise + swept frequency interference signal respectively.
[0031] In step 4, the zero intermediate frequency (IF) FM noise interference signal and the noise + swept frequency interference signal are selected by two-stage SP2T, and one branch is digitally up-converted to output the IF (800MHz) FM noise / noise+sweep frequency interference. After SP3T, the high-quality FM noise / noise+sweep frequency interference of the RF is obtained by up-conversion.
[0032] Step 5. The RF signal received through line feeding or air feeding is down-converted to an intermediate frequency of 800MHz, and then subjected to AD acquisition, digital down-conversion processing, and SP2T selection. It is convolved and filtered with the zero intermediate frequency FM noise / noise + swept frequency interference signal output after the previous 2-level SP2T selection to obtain a zero intermediate frequency convolution noise interference or an aiming frequency noise interference signal, and then digitally up-converted to obtain an intermediate frequency of 800MHz convolution noise interference or an aiming frequency noise interference signal, which is also output to the up-conversion module after SP3T selection to output high-quality RF convolution noise interference or aiming frequency noise interference signal.
[0033] like Figure 2 As shown, the amplifier's theoretical thermal noise power density is -174dBm / Hz. Calculated at a 5MHz bandwidth, the noise power is -107dBm. Based on an upconversion module input power of -15dBm, the amplifier's self-generated thermal noise needs to be amplified by 92dB. Calculated at a 1GHz bandwidth, the noise power is -84dBm. Similarly, based on an upconversion module input power of -15dBm, the amplifier's self-generated thermal noise needs to be amplified by 69dB. To achieve this gain, a multi-stage amplifier cascade is used, using the ERA-4 amplifier, which has a gain of approximately 14dB.
[0034] To ensure a maximum gain of at least 92dB, the noise source was ultimately designed using an eight-stage cascade amplifier. Directly cascading multiple amplifiers can cause self-oscillation, so fixed attenuators are used between the amplifiers for matching. Fixed attenuators are placed after every two amplifier stages in the first six stages. To account for power differences between interference signals of varying bandwidths, the last two amplifier stages are controlled by a switch bank to prevent saturation in the subsequent amplifiers.
[0035] like Figure 3 As shown, the present invention also discloses an interference signal generating system, which includes a noise source generating module, a mixing and filtering module, an intermediate frequency signal processing module, a down-conversion module, an up-conversion module and a frequency synthesizer module.
[0036] The noise source generation module is used to generate a full-band white noise interference signal and transmit it to the mixing and filtering module. The mixing and filtering module is used to receive the full-band white noise interference signal and perform filtering and mixing processing to obtain an intermediate frequency (IF) white noise interference signal. The IF white noise interference signal is divided into two branches and transmitted to the up-conversion module and the IF signal processing module respectively.
[0037] The down-conversion module is used to down-convert the RF target signal received through line feeding or air feeding to obtain an intermediate frequency RF signal, and transmit it to the intermediate frequency signal processing module.
[0038] The intermediate frequency signal processing module receives an intermediate frequency white noise interference signal and an intermediate frequency radio frequency signal, divides the intermediate frequency white noise interference signal into two branches, one branch performs frequency modulation noise modulation, and the other branch performs noise + swept frequency interference modulation to obtain a zero intermediate frequency frequency modulation noise interference signal and a noise + swept frequency interference signal respectively, and then divides the zero intermediate frequency frequency modulation noise interference signal and the noise + swept frequency interference signal into two branches, one branch obtains an intermediate frequency frequency modulation noise interference signal and a noise + swept frequency interference signal after digital up-conversion, and then obtains a radio frequency frequency modulation noise signal and a noise + swept frequency interference signal after up-conversion processing, and then convolves the intermediate frequency radio frequency signal with the zero intermediate frequency noise interference signal and the other branch of the noise + swept frequency interference signal, and filters to obtain a zero intermediate frequency convolution noise interference and an aiming frequency noise interference signal, and then performs digital up-conversion processing to obtain an intermediate frequency convolution noise interference and an aiming frequency noise interference signal, and finally transmits the frequency modulation noise interference signal, the noise + swept frequency interference signal, the intermediate frequency convolution noise interference and the aiming frequency noise interference signal to the up-conversion module. At the same time, the intermediate frequency signal processing module is controlled by the control computer, and transmits the down-conversion control signal, up-conversion control signal and frequency synthesis control signal to the down-conversion module, up-conversion module and frequency synthesis module for control respectively.
[0039] The frequency synthesis module is used to generate a frequency synthesis local oscillator signal and transmit it to the up-conversion module and the down-conversion module, and to generate a reference clock / working clock signal and transmit it to the intermediate frequency signal processing module.
[0040] The up-conversion module is used to receive intermediate frequency white noise interference signals, frequency modulation noise interference signals, noise + swept frequency interference signals, intermediate frequency convolution noise interference signals, and aiming frequency noise interference signals, and perform up-conversion processing to obtain radio frequency blocking noise interference signals, radio frequency frequency modulation noise signals, noise + swept frequency interference signals, radio frequency convolution noise interference signals, and aiming frequency noise interference signals respectively.
[0041] The interference signal generating system of the present invention has an interference frequency range of 2GHz to 18GHz; an interference bandwidth of 5MHz to 1GHz which is continuously adjustable; interference patterns include blocking noise interference, noise + frequency sweeping combination interference, frequency modulation noise interference and convolution noise interference; and an interference power of no less than 0dBm.
[0042] The above are only preferred embodiments of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.
Claims
1. A method for generating an interference signal, characterized in that: The following steps are involved: The full-band white noise interference signal generated by the noise source is filtered and mixed to obtain an intermediate frequency white noise interference signal; The intermediate frequency white noise interference signal is divided into two branches. The white noise interference signal output by one branch is processed by up-conversion to obtain a radio frequency blocking noise interference signal, and the intermediate frequency white noise interference signal output by the other branch is processed by digital down-conversion to obtain a zero intermediate frequency white noise interference signal. The zero intermediate frequency white noise interference signal is divided into two branches, one branch is subjected to frequency modulation noise modulation, and the other branch is subjected to noise + swept frequency interference modulation, thereby obtaining a zero intermediate frequency frequency modulation noise interference signal and a noise + swept frequency interference signal respectively; The zero-IF frequency-modulated noise interference signal and the noise+sweep-frequency interference signal are divided into two branches. One branch is digitally up-converted to obtain the IF frequency-modulated noise interference signal and the noise+sweep-frequency interference signal, and then up-converted to obtain the RF frequency-modulated noise signal and the noise+sweep-frequency interference signal. The RF target signal is received through line feeding or air feeding, and the intermediate frequency RF signal is obtained after down-conversion processing. The intermediate frequency RF signal is then convolved and filtered with the zero intermediate frequency frequency modulation noise interference signal and the other branch of the noise + swept frequency interference signal to obtain the zero intermediate frequency convolution noise interference and the aiming frequency noise interference signal. The digital up-conversion processing is then performed to obtain the intermediate frequency convolution noise interference and the aiming frequency noise interference signal, and the RF convolution noise interference signal and the aiming frequency noise interference signal are then obtained after up-conversion processing.
2. The interference signal generating method according to claim 1, wherein: The noise source is composed of eight amplifier cascades, and fixed attenuators are set after every two amplifiers in the first six amplifiers.
3. The interference signal generating method according to claim 2, wherein: The amplifier is an ERA-4 amplifier.
4. The interference signal generating method according to claim 1, wherein: The last two amplifier stages are controlled by two switch groups.
5. The interference signal generating method according to claim 1, wherein: The intermediate frequency white noise interference signal, the intermediate frequency frequency modulation noise interference signal, the noise+sweep frequency interference signal, the intermediate frequency convolution noise interference signal and the aiming frequency noise interference signal are selected by SP3T before up-conversion processing.
6. An interference signal generating system, characterized in that: It includes a noise source generation module, a mixing and filtering module, an intermediate frequency signal processing module, a down-conversion module, an up-conversion module and a frequency synthesis module; The noise source generation module is used to generate a full-band white noise interference signal and transmit it to the mixing and filtering module; The mixing and filtering module is used to receive the white noise interference signal of the full frequency band, and obtain the intermediate frequency white noise interference signal after filtering and mixing. The intermediate frequency white noise interference signal is divided into two branches and transmitted to the up-conversion module and the intermediate frequency signal processing module respectively; The down-conversion module is used to down-convert the RF target signal received through line feeding or air feeding to obtain an intermediate frequency RF signal, and transmit it to the intermediate frequency signal processing module; The intermediate frequency signal processing module receives an intermediate frequency white noise interference signal and an intermediate frequency radio frequency signal, divides the intermediate frequency white noise interference signal into two branches, one branch performs frequency modulation noise modulation, and the other branch performs noise + swept frequency interference modulation to obtain a zero intermediate frequency frequency modulation noise interference signal and a noise + swept frequency interference signal, respectively; then the zero intermediate frequency frequency modulation noise interference signal and the noise + swept frequency interference signal are divided into two branches, one branch obtains an intermediate frequency frequency modulation noise interference signal and a noise + swept frequency interference signal after digital up-conversion; then the intermediate frequency radio frequency signal is convolved with the zero intermediate frequency frequency modulation noise interference signal and the other branch of the noise + swept frequency interference signal, and filtered to obtain a zero intermediate frequency convolution noise interference and an aiming frequency noise interference signal; then digital up-conversion is performed to obtain an intermediate frequency convolution noise interference and an aiming frequency noise interference signal; finally, the intermediate frequency frequency modulation noise interference signal, the noise + swept frequency interference signal, the intermediate frequency convolution noise interference and the aiming frequency noise interference signal are transmitted to the up-conversion module; The frequency synthesis module is used to generate a frequency synthesis local oscillator signal and transmit it to the up-conversion module and the down-conversion module, and to generate a reference clock / working clock signal and transmit it to the intermediate frequency signal processing module; The up-conversion module is used to receive an intermediate frequency white noise interference signal, an intermediate frequency frequency modulation noise interference signal, a noise+sweep frequency interference signal, an intermediate frequency convolution noise interference signal, and an aiming frequency noise interference signal, and perform up-conversion processing to obtain a radio frequency blocking noise interference signal, a radio frequency frequency modulation noise signal, a noise+sweep frequency interference signal, a radio frequency convolution noise interference signal, and an aiming frequency noise interference signal respectively.
Citation Information
Patent Citations
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CN103675772A
Signal interference device and method
CN107769886A