CN114374436A - Visible light signal detection device - Google Patents
Visible light signal detection device Download PDFInfo
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- CN114374436A CN114374436A CN202210027922.6A CN202210027922A CN114374436A CN 114374436 A CN114374436 A CN 114374436A CN 202210027922 A CN202210027922 A CN 202210027922A CN 114374436 A CN114374436 A CN 114374436A
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- 238000004458 analytical method Methods 0.000 claims abstract description 31
- 238000012545 processing Methods 0.000 claims abstract description 29
- 230000002159 abnormal effect Effects 0.000 claims abstract description 8
- 230000005540 biological transmission Effects 0.000 claims abstract description 7
- 230000003321 amplification Effects 0.000 claims description 29
- 238000003199 nucleic acid amplification method Methods 0.000 claims description 29
- 238000006243 chemical reaction Methods 0.000 claims description 17
- 238000005070 sampling Methods 0.000 claims description 8
- 238000007781 pre-processing Methods 0.000 claims description 7
- 230000000007 visual effect Effects 0.000 claims description 6
- 238000001228 spectrum Methods 0.000 claims description 5
- 230000003595 spectral effect Effects 0.000 claims description 4
- 238000001914 filtration Methods 0.000 claims description 3
- 238000000034 method Methods 0.000 abstract description 8
- 238000007689 inspection Methods 0.000 abstract description 7
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- 230000007246 mechanism Effects 0.000 abstract description 3
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- 238000004891 communication Methods 0.000 description 1
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/11—Arrangements specific to free-space transmission, i.e. transmission through air or vacuum
- H04B10/114—Indoor or close-range type systems
- H04B10/116—Visible light communication
Abstract
The embodiment of the invention discloses a visible light signal detection device which is used for collecting visible light signals in an environment, converting the light signals into electric signals, carrying out related processing and analysis on the electric signals, judging whether abnormal signals transmitted by visible light exist in the environment or not, and deducing and analyzing a modulation method for the transmission signals. By collecting, processing and analyzing the visible light physical signals, inspectors can be assisted to confirm violation and divulgence behaviors, all-round professional inspection of violation physical signal quantity in the environment is provided, and powerful, comprehensive and reliable technical tools are provided for mechanisms and personnel engaged in information safety management and inspection.
Description
Technical Field
The embodiment of the invention relates to the technical field of communication safety and electronic equipment, in particular to a visible light signal detection device.
Background
With the development of information technology, cases with sensitive information leakage occurring through illegal external connection of visible light occur sometimes, how to effectively check illegal ways and effectively control illegal events, and the technology of checking and obtaining evidence of physical signals is the key point of attention of inspectors.
Disclosure of Invention
Therefore, the embodiment of the invention provides a visible light signal detection device to solve the problems that the information safety cannot be guaranteed when the existing case with sensitive information leakage caused by illegal external connection through visible light occurs occasionally.
In order to achieve the above object, the embodiments of the present invention provide the following technical solutions: the utility model provides a visible light signal detection device, the device is including the photoelectric conversion unit, signal processing unit, signal analysis unit and the visual unit that connect gradually, the photoelectric conversion unit is arranged in the environment visible light signal's the collection and converts the visible light signal who gathers into the signal of telecommunication, signal processing unit is used for right the signal of telecommunication is handled, signal analysis unit is used for carrying out time domain and frequency domain analysis to the signal after handling to judge whether there is the unusual carrier signal through visible light transmission in the environment, and analyze the modulation mode of transmission signal, visual unit is used for carrying out visual display to the result of handling and analysis.
Furthermore, the photoelectric conversion unit comprises a photoelectric sensor, an amplifying device for amplifying a front-end signal is arranged at the front end of the photoelectric sensor, and the photoelectric sensor is used for collecting a visible light signal in the environment and converting the visible light signal into a current signal.
Further, the amplifying device adopts a Fresnel lens.
Further, the device also comprises a signal control unit connected with the signal processing unit, and the signal control unit is used for adjusting the trigger level and the sampling frequency.
Furthermore, the signal processing unit comprises a current-to-voltage pre-amplification unit, a secondary amplification unit and a signal preprocessing unit which are sequentially connected, wherein the pre-amplification unit is used for converting a current signal into a voltage signal and performing primary amplification, the secondary amplification unit is used for performing secondary amplification on the signal and adjusting the amplification factor according to the signal size, and the signal preprocessing unit is used for filtering, rectifying, amplitude adjusting, resisting interference and the like of the signal.
Furthermore, the device also comprises an analog-to-digital conversion unit connected between the signal processing unit and the signal analysis unit and used for performing analog-to-digital conversion on the processed signals.
Further, the signal analysis unit adopts an FPGA processor.
Furthermore, the signal analysis unit adopts a method of adopting instantaneous signal quantity analysis, and mainly analyzes nine parameters including the maximum value of the spectrum density of zero-center normalized instantaneous amplitude, the standard deviation of the instantaneous amplitude of the zero-center normalized non-weak signal segment, the standard deviation of the absolute value of the zero-center normalized instantaneous amplitude, the compactness of the zero-center normalized instantaneous amplitude, the standard deviation of the nonlinear component of the instantaneous phase of the zero-center non-weak signal segment, the standard deviation of the absolute value of the instantaneous frequency of the zero-center normalized non-weak signal, the compactness of normalized instantaneous frequency and the spectrum symmetry, and analyzes the modulation mode of the signal according to the parameters.
Further, the modulation modes include AM, PM, LSB, USB, VSB, DSB, AM-FM, 2ASK, 4ASK, 2PSK, 4PSK, 2FSK, 4FSK, and the like.
Furthermore, the signal analysis unit assists inspectors to extract characteristic information of the signals by generating a frequency spectrum graph and a waterfall graph of a frequency domain, so that abnormal carrier signals are found.
The embodiment of the invention has the following advantages:
the visible light signal detection device provided by the embodiment of the invention collects visible light signals in the environment, converts the light signals into electric signals, performs related processing and analysis on the electric signals, judges whether abnormal signals transmitted by visible light exist in the environment or not, and infers and analyzes a modulation method for the transmission signals. By collecting, processing and analyzing the visible light physical signals, inspectors can be assisted to confirm violation and divulgence behaviors, all-round professional inspection of violation physical signal quantity in the environment is provided, and powerful, comprehensive and reliable technical tools are provided for mechanisms and personnel engaged in information safety management and inspection.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below. It should be apparent that the drawings in the following description are merely exemplary, and that other embodiments can be derived from the drawings provided by those of ordinary skill in the art without inventive effort.
Fig. 1 is a schematic structural diagram of a visible light signal detection device provided in embodiment 1 of the present invention;
fig. 2 is a schematic processing diagram of a visible light signal detection apparatus according to embodiment 1 of the present invention;
fig. 3 is a schematic view of a photosensor of a visible light signal detection apparatus according to embodiment 1 of the present invention;
fig. 4 is a schematic diagram of a modulation scheme determination process of a visible light signal detection apparatus according to embodiment 1 of the present invention.
Detailed Description
The present invention is described in terms of particular embodiments, other advantages and features of the invention will become apparent to those skilled in the art from the following disclosure, and it is to be understood that the described embodiments are merely exemplary of the invention and that it is not intended to limit the invention to the particular embodiments disclosed. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1
As shown in fig. 1 and 2, the present embodiment proposes a visible light signal detection apparatus including a photoelectric conversion unit, a signal processing unit, a signal analysis unit, and a visualization unit, which are connected in sequence. The method comprises the steps of receiving a visible light signal in the environment, converting the light signal into an electric signal, carrying out related processing and analysis on the electric signal, judging whether an abnormal signal transmitted by visible light exists in the environment, and deducing and analyzing a modulation method of the transmitted signal.
The photoelectric conversion unit is used for collecting visible light signals in the environment and converting the collected visible light signals into electric signals, the signal processing unit is used for processing the electric signals, the signal analysis unit is used for carrying out time domain and frequency domain analysis on the processed signals so as to judge whether abnormal carrier signals transmitted through visible light exist in the environment or not and analyze the modulation mode of the transmission signals, and the visualization unit is used for visually displaying the processing and analysis results.
In this embodiment, the apparatus further includes a signal control unit connected to the signal processing unit, and the signal control unit is configured to adjust the trigger level and the sampling frequency. The user can acquire signals with the frequency width within 100M by adjusting the signal sampling rate, so that the sampling precision is adjusted, and the efficiency and the accuracy of finding abnormal carriers are improved.
In this embodiment, the photoelectric conversion unit includes a photoelectric sensor, an amplifying device for amplifying a front end signal is disposed at a front end of the photoelectric sensor, and the photoelectric sensor collects a visible light signal in an environment and converts the visible light signal into a current signal, as shown in fig. 3. The amplifying device adopts a Fresnel lens. The front-end signal amplification is carried out by adopting a customized Fresnel lens mode, and the amplifier improves the level of an input signal and improves the measurement precision and sensitivity. Visible light signals in the environment are collected through the optical sensor and converted into current signals, and the current signals are the basis of subsequent signal processing.
The visible light sensor converts the detected light signal into a current signal. After current-to-voltage conversion, secondary amplification and signal preprocessing, analog-to-digital conversion is carried out, and digital quantity signals enter an FPGA (field programmable gate array) for analysis and processing.
The signal processing unit comprises a current-to-voltage pre-amplification unit, a secondary amplification unit and a signal preprocessing unit which are sequentially connected.
The pre-amplification unit is used for converting the current signal into a voltage signal and carrying out primary amplification, and the secondary amplification unit is used for carrying out secondary amplification on the signal and adjusting the amplification factor according to the signal size.
In the embodiment, the scheme adopts two stages of amplification, the first stage is a front-end scheme, and the signal input precision is ensured. The second-stage amplification is adjustable amplification, and the amplification factor is adjusted according to the signal size.
The signal preprocessing unit is used for processing of filtering, rectifying, amplitude adjusting, anti-interference and the like of signals. The filter may remove uncorrelated noise over a range of frequencies. Almost all data acquisition applications are subject to a certain degree of 50Hz or 60Hz noise (from power lines or mechanical equipment), with low pass filters used to suppress the 50Hz or 60Hz noise to the maximum. The amplitude adjustment and amplification ensure the subsequent processing of the signal. The signal output is single-ended output, because the anti-interference capability of the single-ended signal is poor, the wiring of the single-ended signal is shortened as much as possible, the impedance needs to be well matched, and the single-ended signal needs to be subjected to anti-interference ground covering measures.
Furthermore, the device also comprises an analog-to-digital conversion unit connected between the signal processing unit and the signal analysis unit and used for performing analog-to-digital conversion on the processed signals.
In this embodiment, the signal analysis unit employs an FPGA processor. The signal analysis unit adopts a method of adopting instantaneous signal quantity analysis, and mainly analyzes nine parameters including the maximum value of the spectral density of zero-center normalized instantaneous amplitude, the standard deviation of the instantaneous amplitude of the zero-center normalized non-weak signal segment, the standard deviation of the absolute value of the zero-center normalized instantaneous amplitude, the compactness of the zero-center normalized instantaneous amplitude, the standard deviation of the nonlinear component of the instantaneous phase of the zero-center non-weak signal segment, the standard deviation of the absolute value of the instantaneous frequency of the zero-center normalized non-weak signal, the compactness of normalized instantaneous frequency and the spectral symmetry, and analyzes the modulation mode of the signal according to the parameters. Thirteen signal modulation modes including AM, PM, LSB, USB, VSB, DSB, AM-FM, 2ASK, 4ASK, 2PSK, 4PSK, 2FSK, 4FSK and the like can be judged.
The judgment flow is shown in fig. 4, and the main judgment logic is:
the maximum value of the spectrum density of the zero center normalized instantaneous amplitude is used for distinguishing 4PSK, AM _ FM, FM and FSK signals;
the standard deviation of the instantaneous phase nonlinear component of the zero-center non-weak signal segment is used for distinguishing 2PSK, DSB and 4PSK, AM _ FM, FM and FSK signals;
the standard deviation of the instantaneous phase nonlinear component of the zero center non-weak signal segment is used for distinguishing AM, ASK, VSB and FSK/DSB/PSK/AM _ FM signals;
the standard deviation of the zero-center normalized instantaneous amplitude absolute value is used to distinguish 2ASK from 4 ASK;
the standard deviation of the absolute value of the zero-centered normalized non-weak signal instantaneous frequency is used to distinguish 2FSK from 4 FSK.
The visible light signal detection device provided by the embodiment realizes a signal acquisition function, and can detect and receive data with sound frequency of 0Hz-100 MHz; the method comprises the steps of realizing a signal identification function, carrying out time domain and frequency domain analysis on collected optical signals, assisting inspectors to extract characteristic information of sound signals through a frequency spectrogram and a waterfall graph of a frequency domain, and finding suspicious carrier signals; the sampling rate setting function is realized, and the system can acquire signals with different frequency widths by adjusting the sampling rate, so that the sampling precision is adjusted, and the efficiency and the accuracy of finding abnormal carriers are improved; through the trigger level setting function, the equipment can adapt to different detection environments by adjusting the trigger level value, eliminates interference signals and improves the inspection efficiency.
Through collecting, processing and analyzing visible light physical signals, inspectors are assisted to confirm violation and divulgence behaviors, all-round professional inspection of violation physical signal quantity in the environment is provided, and powerful, comprehensive and reliable technical tools are provided for mechanisms and personnel engaged in information safety management and inspection.
Although the invention has been described in detail above with reference to a general description and specific examples, it will be apparent to one skilled in the art that modifications or improvements may be made thereto based on the invention. Accordingly, such modifications and improvements are intended to be within the scope of the invention as claimed.
Claims (10)
1. The utility model provides a visible light signal detection device, its characterized in that, the device is including the photoelectric conversion unit, signal processing unit, signal analysis unit and the visual unit that connect gradually, the photoelectric conversion unit is arranged in the environment visible light signal's the collection and converts the visible light signal who gathers into the signal of telecommunication, signal processing unit is used for right the signal of telecommunication is handled, signal analysis unit is used for carrying out time domain and frequency domain analysis to the signal after handling to judge whether exist in the environment through visible light transmission's unusual carrier signal, and analyze the modulation mode of transmission signal, visual unit is used for carrying out visual display to the result of handling and analysis.
2. The visible light signal detection device according to claim 1, wherein the photoelectric conversion unit comprises a photoelectric sensor, an amplification device for amplifying a front end signal is disposed at a front end of the photoelectric sensor, and the photoelectric sensor collects an ambient visible light signal and converts the ambient visible light signal into a current signal.
3. The visible light signal detection device of claim 2, wherein the magnifying device is a fresnel lens.
4. The visible light signal detection device of claim 1, further comprising a signal control unit connected to the signal processing unit, wherein the signal control unit is configured to adjust the trigger level and the sampling frequency.
5. The visible light signal detection device according to claim 1, wherein the signal processing unit includes a current-to-voltage pre-amplification unit, a secondary amplification unit, and a signal preprocessing unit, which are connected in sequence, the pre-amplification unit is configured to convert a current signal into a voltage signal and perform primary amplification, the secondary amplification unit is configured to perform secondary amplification on the signal and adjust an amplification factor according to a signal size, and the signal preprocessing unit is configured to perform filtering, rectification, amplitude adjustment, anti-interference, and other processing on the signal.
6. The visible light signal detection device of claim 1, further comprising an analog-to-digital conversion unit connected between the signal processing unit and the signal analysis unit for performing analog-to-digital conversion on the processed signal.
7. The visible light signal detection device of claim 1, wherein the signal analysis unit employs an FPGA processor.
8. The visible light signal detection device according to claim 1, wherein the signal analysis unit analyzes the modulation mode of the signal according to nine parameters of a maximum value of a spectral density of zero-center normalized instantaneous amplitude, a standard deviation of an instantaneous amplitude of zero-center normalized non-weak signal segment, a standard deviation of an absolute value of a zero-center normalized instantaneous amplitude, compactness of a zero-center normalized instantaneous amplitude, a standard deviation of a nonlinear component of an instantaneous phase of a zero-center non-weak signal segment, a standard deviation of an absolute value of an instantaneous frequency of a zero-center normalized non-weak signal, compactness of normalized instantaneous frequency, and spectral symmetry by using an instantaneous semaphore analysis method.
9. The apparatus according to claim 1, wherein the modulation scheme comprises AM, PM, LSB, USB, VSB, DSB, AM-FM, 2ASK, 4ASK, 2PSK, 4PSK, 2FSK, 4FSK, etc.
10. The apparatus as claimed in claim 1, wherein the signal analysis unit generates a frequency spectrum graph and a waterfall graph of a frequency domain to assist an inspector in extracting characteristic information of the signal, so as to find an abnormal carrier signal.
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| US20130208184A1 (en) * | 2010-04-27 | 2013-08-15 | Interdigital Patent Holdings, Inc. | Inter-device communications using visible light |
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| CN112821944A (en) * | 2021-01-06 | 2021-05-18 | 天津戎行集团有限公司 | Visible light signal detection device |
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- 2022-01-11 CN CN202210027922.6A patent/CN114374436A/en active Pending
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| US20130208184A1 (en) * | 2010-04-27 | 2013-08-15 | Interdigital Patent Holdings, Inc. | Inter-device communications using visible light |
| CN104052703A (en) * | 2014-07-04 | 2014-09-17 | 哈尔滨工程大学 | Method for microsampling data digital modulation recognition |
| CN105634602A (en) * | 2016-03-10 | 2016-06-01 | 文成县刀锋科技有限公司 | Remote visible light communication system |
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