CN109547040B - Anti-interference signal conveying method - Google Patents
Anti-interference signal conveying method Download PDFInfo
- Publication number
- CN109547040B CN109547040B CN201811348430.7A CN201811348430A CN109547040B CN 109547040 B CN109547040 B CN 109547040B CN 201811348430 A CN201811348430 A CN 201811348430A CN 109547040 B CN109547040 B CN 109547040B
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- Prior art keywords
- signal
- interference
- frequency
- transmitting
- acquisition module
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/02—Transmitters
- H04B1/04—Circuits
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/02—Transmitters
- H04B1/04—Circuits
- H04B1/0458—Arrangements for matching and coupling between power amplifier and antenna or between amplifying stages
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/02—Transmitters
- H04B1/04—Circuits
- H04B1/0475—Circuits with means for limiting noise, interference or distortion
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/02—Transmitters
- H04B1/04—Circuits
- H04B2001/0408—Circuits with power amplifiers
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- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)
- Noise Elimination (AREA)
- Networks Using Active Elements (AREA)
Abstract
The invention discloses an anti-interference signal transmission method, which comprises the following steps: s1: the digital signal processing chip sends a transmitting signal to a transmitting phase-locked loop local oscillator in advance through a transmission line, the transmitting phase-locked loop local oscillator acquires the transmitting signal through an acquisition module to obtain a stable transmitting signal, the acquisition module adopts a low-pass input filter to filter alternating current interference, and compensation measures are adopted for direct current series mode interference; s2: the pre-amplification module of the acquisition module is a differential amplification circuit with high input impedance and high common-mode rejection ratio, and is used for finishing smooth input of electric signals, eliminating common-mode noise and amplifying transmission signals; the acquisition module of the invention adopts a low-pass input filter to filter out alternating current interference, and adopts a compensation measure for direct current series mode interference; the pre-amplification module of the acquisition module is a differential amplification circuit with high input impedance and high common-mode rejection ratio, and can smoothly input electric signals and eliminate common-mode noise.
Description
Technical Field
The invention relates to the technical field of anti-interference signal transmission methods, in particular to an anti-interference signal transmission method.
Background
The existing whole equipment integrates more and more electronic and electrical equipment, and in a complex space environment, when the electronic equipment transmits and receives signals, the electronic equipment can interfere with each other, and the measurement signals are interfered, so that the whole equipment can work in a fault or abnormal way.
Disclosure of Invention
The present invention is directed to a method for transmitting an interference-free signal, so as to solve the above problems.
In order to achieve the purpose, the invention provides the following technical scheme: an interference-proof signal transmission method, comprising the steps of:
s1: the digital signal processing chip sends a transmitting signal to a transmitting phase-locked loop local oscillator in advance through a transmission line, the transmitting phase-locked loop local oscillator acquires the transmitting signal through an acquisition module to obtain a stable transmitting signal, the acquisition module adopts a low-pass input filter to filter alternating current interference, and compensation measures are adopted for direct current series mode interference;
s2: the pre-amplification module of the acquisition module is a differential amplification circuit with high input impedance and high common-mode rejection ratio, and is used for finishing smooth input of electric signals, eliminating common-mode noise and amplifying transmission signals;
s3: mixing the stable transmitting signal and an intermediate frequency signal generated by a fixed intermediate frequency oscillator through a first mixer, receiving the mixed signal through an anti-interference module, and filtering by adopting a first band-pass filter to obtain a first intermediate signal;
s4: the first intermediate signal is transmitted as an excitation signal through the transceiver module, and meanwhile the control module receives a backflow signal of the anti-interference module through the transmission line;
s5: the receiving and transmitting module receives a response signal transmitted back by the sensor, and meanwhile, the digital signal processing chip transmits a reference signal to a receiving phase-locked loop local oscillator through the A/D converter;
s6: the response signal is subjected to direct-current component separation among stages through a main amplifying circuit, a second-stage amplifying circuit, a 30Hz low-pass filtering circuit and level adjusting circuits to obtain an amplified first intermediate signal, and the response signal is filtered by adopting a second band-pass filter to obtain a filtered response signal;
s7: the amplified first intermediate signal and the reference signal are subjected to frequency mixing through a second frequency mixer to obtain a second intermediate signal, and a receiving intermediate frequency filter is used for filtering the second intermediate signal to obtain a filtered second intermediate signal;
s8: and the third mixer mixes the filtered second intermediate signal with a low-frequency signal sent by a second local oscillator to obtain a third intermediate signal, and transmits the third intermediate signal.
Preferably, the transmission line uses conductive cloth, and the signal line is wrapped by the mesh woven wire.
Preferably, the transmission signal frequency is higher or lower than the reference signal frequency.
Preferably, the frequency of the first intermediate signal coincides with the frequency of the reference signal.
Preferably, the low-pass input filter has any one of an RC network, an LC network, and a double T network.
Preferably, in step S5, when the spike-type serial-mode interference becomes a main interference source and the system has low requirement on the sampling rate, the use of the dual-slope integral a/D converter can weaken the influence of the serial-mode interference.
Compared with the prior art, the invention has the beneficial effects that: the acquisition module of the invention adopts a low-pass input filter to filter out alternating current interference, and adopts a compensation measure for direct current series mode interference;
the pre-amplification module of the acquisition module is a differential amplification circuit with high input impedance and high common-mode rejection ratio, and is used for finishing smooth input of electric signals, eliminating common-mode noise and amplifying transmission signals;
the response signal is subjected to interstage high-pass separation between the main amplifying circuit, the second-stage amplifying circuit, the 30Hz low-pass filter circuit and the level adjusting circuit to obtain an amplified first intermediate signal, and the influence of the direct-current component is removed.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail with reference to the following embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
An interference-proof signal transmission method, comprising the steps of:
s1: the digital signal processing chip sends a transmitting signal to a transmitting phase-locked loop local oscillator in advance through a transmission line, the transmitting phase-locked loop local oscillator acquires the transmitting signal through an acquisition module to obtain a stable transmitting signal, an EEG acquisition module adopts a low-pass input filter to filter alternating current interference, and compensation measures are adopted for direct current series mode interference;
s2: the pre-amplification module of the acquisition module is a differential amplification circuit with high input impedance and high common-mode rejection ratio, and is used for finishing smooth input of electric signals, eliminating common-mode noise and amplifying transmission signals;
s3: mixing the stable transmitting signal and an intermediate frequency signal generated by a fixed intermediate frequency oscillator through a first mixer, receiving the mixed signal through an anti-interference module, and filtering by adopting a first band-pass filter to obtain a first intermediate signal;
s4: the first intermediate signal is transmitted as an excitation signal through the transceiver module, and meanwhile the control module receives a backflow signal of the anti-interference module through the transmission line;
s5: the receiving and transmitting module receives a response signal transmitted back by the sensor, and meanwhile, the digital signal processing chip transmits a reference signal to a receiving phase-locked loop local oscillator through the A/D converter;
s6: the response signal is subjected to direct-current component separation among stages through a main amplifying circuit, a second-stage amplifying circuit, a 30Hz low-pass filtering circuit and level adjusting circuits to obtain an amplified first intermediate signal, and the response signal is filtered by adopting a second band-pass filter to obtain a filtered response signal;
s7: the amplified first intermediate signal and the reference signal are subjected to frequency mixing through a second frequency mixer to obtain a second intermediate signal, and a receiving intermediate frequency filter is used for filtering the second intermediate signal to obtain a filtered second intermediate signal;
s8: and the third mixer mixes the filtered second intermediate signal with a low-frequency signal sent by a second local oscillator to obtain a third intermediate signal, and transmits the third intermediate signal.
Specifically, the transmission line uses conductive cloth, and the signal line is wrapped by the mesh-woven wire.
Specifically, the transmission signal frequency is higher or lower than the reference signal frequency.
Specifically, the frequency of the first intermediate signal coincides with the frequency of the reference signal.
Specifically, the low-pass input filter may be any one of an RC network, an LC network, and a dual T network.
Specifically, in step S5, when the spike-type serial-mode interference becomes a main interference source and the system has low requirement on the sampling rate, the dual-slope integral a/D converter may be used to reduce the influence of the serial-mode interference.
The transmission line is made of conductive cloth, and the signal line is wrapped by the mesh-shaped woven conducting wire; the outside of the transmission line is provided with a conductor wrapped by a conductor called a shielding line, the wrapped conductor called a shielding layer, the shielding layer needs to be grounded, and an external interference signal can be guided into the ground by the shielding layer, so that the interference of the interference signal entering an inner conductor is avoided, and the loss of the transmission signal is reduced.
The acquisition module of the invention adopts a low-pass input filter to filter out alternating current interference, and adopts a compensation measure for direct current series mode interference;
the pre-amplification module of the acquisition module is a differential amplification circuit with high input impedance and high common-mode rejection ratio, and is used for finishing smooth input of electric signals, eliminating common-mode noise and amplifying transmission signals;
the response signal is subjected to interstage high-pass separation between the main amplifying circuit, the second-stage amplifying circuit, the 30Hz low-pass filter circuit and the level adjusting circuit to obtain an amplified first intermediate signal, and the influence of the direct-current component is removed.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.
Claims (6)
1. An interference-proof signal transmission method is characterized by comprising the following steps:
s1: the digital signal processing chip sends a transmitting signal to a transmitting phase-locked loop local oscillator in advance through a transmission line, the transmitting phase-locked loop local oscillator acquires the transmitting signal through an acquisition module to obtain a stable transmitting signal, the acquisition module adopts a low-pass input filter to filter alternating current interference, and compensation measures are adopted for direct current series mode interference;
s2: the pre-amplification module of the acquisition module is a differential amplification circuit with high input impedance and high common-mode rejection ratio, and is used for finishing smooth input of electric signals, eliminating common-mode noise and amplifying transmission signals;
s3: mixing the stable transmitting signal and an intermediate frequency signal generated by a fixed intermediate frequency oscillator through a first mixer, receiving the mixed signal through an anti-interference module, and filtering by adopting a first band-pass filter to obtain a first intermediate signal;
s4: the first intermediate signal is transmitted as an excitation signal through the transceiver module, and meanwhile the control module receives a backflow signal of the anti-interference module through the transmission line;
s5: the receiving and transmitting module receives a response signal transmitted back by the sensor, and meanwhile, the digital signal processing chip transmits a reference signal to a receiving phase-locked loop local oscillator through the A/D converter;
s6: the response signal is subjected to direct-current component separation among stages through a main amplifying circuit, a second-stage amplifying circuit, a 30Hz low-pass filtering circuit and level adjusting circuits to obtain an amplified first intermediate signal, and the response signal is filtered by adopting a second band-pass filter to obtain a filtered response signal;
s7: the amplified first intermediate signal and the reference signal are subjected to frequency mixing through a second frequency mixer to obtain a second intermediate signal, and a receiving intermediate frequency filter is used for filtering the second intermediate signal to obtain a filtered second intermediate signal;
s8: and the third mixer mixes the filtered second intermediate signal with a low-frequency signal sent by a second local oscillator to obtain a third intermediate signal, and transmits the third intermediate signal.
2. The interference-free signal transmission method according to claim 1, wherein: the transmission line uses conductive cloth, and the signal line is wrapped by the mesh-shaped woven wire.
3. The interference-free signal transmission method according to claim 1, wherein: the transmission signal frequency is higher or lower than the reference signal frequency.
4. The interference-free signal transmission method according to claim 1, wherein: the frequency of the first intermediate signal coincides with the frequency of the reference signal.
5. The interference-free signal transmission method according to claim 1, wherein: the low-pass input filter is any one of an RC network, an LC network and a double T network.
6. The interference-free signal transmission method according to claim 1, wherein: in step S5, when the spike-type serial-mode interference becomes a main interference source and the system has low requirement on the sampling rate, the influence of the serial-mode interference can be reduced by using the dual-slope integral a/D converter.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811348430.7A CN109547040B (en) | 2018-11-13 | 2018-11-13 | Anti-interference signal conveying method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811348430.7A CN109547040B (en) | 2018-11-13 | 2018-11-13 | Anti-interference signal conveying method |
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| Publication Number | Publication Date |
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| CN109547040A CN109547040A (en) | 2019-03-29 |
| CN109547040B true CN109547040B (en) | 2021-01-26 |
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| CN113592725B (en) * | 2021-06-29 | 2023-07-28 | 南京诺源医疗器械有限公司 | Medical optical imaging noise elimination method |
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| CN102064800B (en) * | 2010-11-24 | 2013-09-11 | 成都纽斯达电子有限责任公司 | Method for automatically realizing tuning of electronic tuning radio |
| CN103916148B (en) * | 2013-01-05 | 2016-08-03 | 华为技术有限公司 | A kind of adaptive RF Interference Cancellation device, method, receiver and communication system |
| CN103391047A (en) * | 2013-07-12 | 2013-11-13 | 成都林海电子有限责任公司 | 1.2GHz-bandwidth L-waveband down converter and down converter achieving method |
| CN106301516B (en) * | 2016-08-08 | 2020-07-21 | 华为技术有限公司 | Diversity receiver and terminal |
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