CN117768244B - Multi-band/dual-band encryption optical communication method and system - Google Patents
Multi-band/dual-band encryption optical communication method and system Download PDFInfo
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Abstract
The invention discloses a multi-band/dual-band encryption optical communication method and system, comprising the steps of carrying out algorithm soft encryption on required transmission contents to obtain ciphertext and a secret key; the ciphertext and the secret key are respectively subjected to segmentation marking treatment, and then signal modulation is carried out to obtain a ciphertext modulation carrier signal and a secret key modulation carrier signal; the method comprises the steps of utilizing different channels to send ciphertext modulation carrier signals and key modulation carrier signals, and enabling an interference light source to send interference light signals, wherein the interference light signals are signals with randomly changed light intensity; receiving a ciphertext modulated carrier signal and a key modulated carrier signal; and converting the received signal into a voltage signal to obtain a corresponding ciphertext and a key, and finally obtaining transmission content. The invention changes the sequence and the channel for transmitting the cipher text key randomly, and adds the interference signal at the same time, thereby effectively improving the safety of communication compared with the common soft encryption method.
Description
Technical Field
The present invention relates to the field of optical communications, and in particular, to a multi-band/dual-band encrypted optical communication method and system.
Background
The indoor wireless optical communication system uses the white light LED as an illumination light source, and uses the optical signal modulated on the LED as a carrier to establish a wireless optical communication network, and has the advantages of abundant frequency band resources, no electromagnetic interference, energy conservation, environmental protection, low cost and the like. By virtue of numerous advantages, the indoor wireless optical communication technology has become an important point of future wireless communication development, is currently popularized and applied to numerous fields on a large scale, and has a wide application prospect.
The detection part of the current indoor wireless optical communication technology is mainly based on an inorganic photoelectric detector, however, due to material limitation, if the inorganic photoelectric detector is to realize the function of wavelength selective detection, an additional filtering component is required, which prevents the application of the inorganic photoelectric detector in a smart phone, the internet of things and an advanced driving assistance system. Organic photodetectors have attracted considerable attention both at home and abroad due to their potential application value, wide application fields and constantly improved performance. Due to the rapid progress in recent years, the performance index of the organic photoelectric detector can be optimized in the visible spectrum range and compared with that of the low-noise inorganic photoelectric detector, the organic photoelectric detector is expected to become a substitute of the traditional inorganic detector, and the outstanding characteristic of the organic photoelectric detector is combined with the indoor wireless optical communication technology, so that the application of the organic photoelectric detector in the fields of wearable equipment, medical care monitoring systems, internet of things and the like can be promoted.
With the rapid development of indoor wireless optical communication systems, the increase in information volume has led to the security problem of optical communication networks. In wireless optical communication, an eavesdropper can easily eavesdrop on a transmission signal by using scattering of light. For indoor wireless optical communications, there is also a risk of interception and interception of information. Most seriously, the above eavesdropping method does not cause interruption of communication, so that the user does not find that the transmission signal has been eavesdropped. In many application scenarios, when information such as medical data and scientific research secrets is transmitted, extremely high requirements are placed on safety, so that new challenges are placed on information safety of indoor wireless optical communication.
Disclosure of Invention
In order to overcome the above-mentioned drawbacks and disadvantages of the prior art, an object of the present invention is to provide a multi-band/dual-band encrypted optical communication method and system.
The invention provides a scheme with higher security for application scenes requiring indoor confidential file transmission by utilizing the characteristic of narrowband response of the organic detector in the encrypted optical communication system.
The aim of the invention is achieved by the following technical scheme:
A multi-band/dual-band encrypted optical communication method, suitable for multi-band/dual-band narrowband photodetectors, comprising:
Carrying out algorithm soft encryption on the content to be transmitted to obtain ciphertext and a secret key;
the ciphertext and the secret key are respectively subjected to segmentation marking treatment, and then signal modulation is carried out to obtain a ciphertext modulation carrier signal and a secret key modulation carrier signal;
The method comprises the steps of utilizing different channels to send ciphertext modulation carrier signals and key modulation carrier signals, and enabling an interference light source to send interference light signals, wherein the interference light signals are signals with randomly changed light intensity;
Receiving a ciphertext modulated carrier signal and a key modulated carrier signal;
converting the received signal into a voltage signal to obtain a corresponding ciphertext and a key;
And recombining and restoring each group of ciphertext and the secret key according to the mark sequence, and combining the restored ciphertext and the secret key to obtain transmission content.
Further, the different channels correspond to different optical bands.
Further, the method further comprises a self-aiming step before the step of sending the ciphertext modulated carrier signal and the key modulated carrier signal by using different channels, wherein the interference light source sends the interference light signal.
Further, the self-aiming step includes:
transmitting an interference optical signal, wherein the interference optical signal is an optical signal with stable light intensity;
receiving an interference light signal, and determining the position information of a transmitting end according to the detected light intensity;
returning the position information to a transmitting end, and determining the position relation between a transmitting light source and a receiving end by the transmitting end according to the position information;
And the positions of the transmitting end and the receiving end are adjusted, so that the influence of multipath effect is reduced.
Further, the ciphertext modulated carrier signal and the key modulated carrier signal are transmitted using different channels, in particular using random ordering.
A multi-band/dual-band encrypted optical communication system, comprising:
an encryption module: the method comprises the steps of carrying out algorithm soft encryption on the required transmission content to obtain ciphertext and a secret key;
Transmitting end: the device comprises an optical signal modulation module, a light source module and an aiming module;
The light source module comprises a double/multi-channel emission light source and an interference light source, wherein the emission light sources of at least two different channels randomly generate ciphertext carrier light signals and key carrier light signals, and the interference light source emits interference light;
The optical signal modulation module is used for modulating the ciphertext and the secret key to obtain a modulated signal of the carrier wave, and transmitting the modulated signal through wireless optical links of different channels;
The aiming module comprises a Bluetooth receiver, a receiving end and a receiving end, wherein the Bluetooth receiver is used for receiving the position information of the transmitting light source and calculating the position information of the receiving end according to the position information;
the receiving end comprises a detection module, an aiming detection module and a demodulation module;
The detection module is specifically a detector with a dual-band narrow-band response and has a self-filtering characteristic, and a luminous wave band of the emission light source corresponds to a detection wave band of the detection module one by one and is used for receiving a modulation signal of a carrier wave;
The aiming detection module is used for receiving the light signals sent by the light source module, calculating and determining the position information of the light source module according to the light signals, and returning to the aiming module;
the demodulation module is used for obtaining a modulation signal, obtaining an amplified voltage signal, further obtaining a ciphertext and a secret key, and obtaining transmitted contents according to the ciphertext and the secret key;
and the microcontroller is connected with the encryption module, the transmitting end and the receiving end.
Further, the emitting light source further comprises a reflective cup.
Further, a steering engine is arranged below the emitting light source and used for changing the direction of the emitting light source according to the position information of the receiving end and aligning with the detection module.
Further, the front of the detector also comprises a Fresnel lens.
Further, the aiming detection module comprises an aiming detection panel, an integrator and a Bluetooth transmitter;
The aiming detection panel is specifically an array formed by a plurality of photoelectric detectors and is used for receiving light signals emitted by the interference light source;
the integrator is used for integrating and calculating the intensity of the light signals received by a plurality of points aiming at the detection panel, and taking the point with the strongest light signal intensity as the position of the emitting light source.
The bluetooth transmitter is used for transmitting the position information of the transmitting light source to the bluetooth receiver.
Compared with the prior art, the invention has the following advantages:
(1) The invention adopts the organic photoelectric detector with self-filtering characteristic as the receiving end, thus realizing the selective detection of light in different wave bands without adding a filtering device, effectively preventing the interference of the ambient light on the signal receiving, reducing noise and ensuring the accuracy of signal transmission.
(2) The invention utilizes the characteristic of the narrowband response of the organic detector and combines the soft encryption algorithm to transmit the ciphertext key obtained by soft encryption of the information in two or more optical wave bands, so that the receiving end can acquire the target transmission signal only by accurately receiving the contents of the optical wave bands, and the system has higher safety during information transmission.
(3) The invention also provides an interference light source, the light-emitting wave band of which is inconsistent with the response wave band of the organic detector, so that the interference light source can not interfere with the detector in the system, and correspondingly, other types of detectors can not accurately detect the target light signal.
(4) The invention changes the sequence and the channel for transmitting the cipher text key randomly, and adds the interference signal at the same time, thereby effectively improving the safety of communication compared with the common soft encryption method.
(5) The aiming detection module receives the signal of the interference light source to obtain the position information of the emission light source, and then sends the position information to the aiming module to calculate the position relation between the emission module and the detection module, and the steering engine emits deflection to realize the self alignment of the emission light source and the detection module, so that the influence of channel weakness, intersymbol interference and the like caused by multipath effect can be reduced, and the information transmission is more stable.
(6) The invention combines the organic photoelectric detector with the indoor wireless optical communication system, and is hopeful to integrate the receiving end to the wearable equipment and the miniature equipment due to the characteristics of light weight, flexibility and the like of the organic photoelectric detector, thereby promoting the realization of more application scenes and schemes which need high safety.
Drawings
FIG. 1 is a schematic diagram of the functional module structure of the present invention;
FIG. 2 is a noise spectrum of the present invention employing a dual band organic photodetector;
fig. 3 is a flow chart of the method of the present invention.
Detailed Description
The present invention will be described in further detail with reference to examples, but embodiments of the present invention are not limited thereto.
As shown in fig. 1, a multi-band/dual-band encrypted optical communication system 100, suitable for use in a communication system including a multi-band/dual-band organic photodetector, comprises the following:
Encryption module 110: the method is used for carrying out algorithm soft encryption on the required transmission content to obtain ciphertext and a secret key.
The method also comprises preprocessing the ciphertext and the secret key, wherein the preprocessing comprises the steps of respectively segmenting and marking the ciphertext and the secret key, and grouping the ciphertext and the secret key according to the number of different channels.
Transmitting end 120: comprises an optical signal modulation module 121, a light source module 122 and an aiming module 123;
The light source module 122 includes a dual/multi-channel light source and an interference light source, wherein the light sources of at least two different channels generate the ciphertext carrier light signal and the key carrier light signal at random, and the interference light source emits the interference light, and in this embodiment, two different channels are preferable.
The optical signal modulation module 121 is configured to modulate the ciphertext and the secret key to obtain a modulated signal of the carrier, and transmit the modulated signal through wireless optical links of different channels
The aiming module 123 includes a bluetooth receiver for receiving the position information of the transmitting light source and calculating the position information of the receiving end according to the position information;
the receiving end 130 comprises a detection module 131, an aiming detection module 133 and a demodulation module 132;
The detection module 131 selects an organic photoelectric detector with dual-band narrowband response and self-filtering characteristics, and the light-emitting wave band of the emission light source corresponds to the detection wave band of the detection module one by one and is used for receiving the modulation signal of the carrier wave;
the aiming detection module 133 is configured to receive the light signal sent by the light source module, and calculate and determine the position information of the light source module according to the light signal, and return to the aiming module;
Further, the optical signal sent by the light source module includes an optical signal emitted by the emission light source or an optical signal emitted by the interference light source, which is preferable in this embodiment: the aiming detection module receives the light signal emitted by the interfering light source.
The demodulation module 132 is configured to obtain an amplified voltage signal according to the obtained modulated signal, further obtain a ciphertext and a key, and obtain the transmitted content according to the ciphertext and the key;
And the microcontroller 140 is connected with the encryption module, the transmitting end and the receiving end.
Further, the encryption module encrypts the transmission content through program code operation, and obtains a corresponding ciphertext and a key.
The embodiment specifically adopts a symmetrical soft encryption algorithm with higher security to obtain a corresponding ciphertext and a key, and after the demodulation module completes demodulation signals, the corresponding decryption program processes the received ciphertext and the key to obtain final target transmission content.
Further, the light source module includes a dual/multi-channel emission light source and an interference light source, in this embodiment, two emission light sources, namely, emission light source 1 and emission light source 2 are adopted, the emission light sources of the two channels modulate light signals under the control of a microcontroller, the microcontroller controls the two emission light sources to realize channel switching, and the modulated light signals carrying ciphertext and secret key are transmitted by using different channels. While transmitting the signal, the disturbing light source is controlled by the microcontroller 140 to emit disturbing light.
The wave bands of the interference light source are completely different from those of the emission light source, and the wave bands of the interference light source are not in the response range of the detector, so that the interference light source cannot interfere with the receiving of the optical signal.
Further, a steering engine is arranged at the bottom of the emission light source.
Further, the optical signal modulation module is used for modulating the ciphertext and the secret key to obtain a modulated signal of the carrier wave, and transmitting the modulated signal through wireless optical links of different channels.
Specifically: the embodiment utilizes different channels to transmit ciphertext modulated carrier signals and key modulated carrier signals, and particularly adopts random ordering transmission.
Such as:
After soft encryption is carried out on the transmission content, the obtained ciphertext keys are randomly divided into two components and marked to obtain ciphertext 1, ciphertext 2, key 1 and key 2. The method comprises the steps of transmitting in two rounds, wherein the first round sequentially uses different channels to transmit ciphertext 1 and secret key 2; the second round uses different channels to transmit the secret key 2 and the ciphertext 1 successively. The order of the cipher text keys and the transmission channel are completely random.
The transmission content may also be divided into three or more components and transmitted randomly through two or more channels, respectively.
Further, the aiming module in this embodiment includes a bluetooth receiver, configured to receive the position information of the transmitting light source and calculate the position information of the receiving end according to the position information, so as to implement self-aiming.
The method comprises the following steps:
First, the interference light source sends stable light signal to the aiming detection module. The aiming detection module is an array formed by a plurality of detectors, integrates and calculates the light intensity detected by the plurality of detectors, and determines the position of the emission light source according to the point with the maximum light intensity.
And then the information position is sent to the aiming module of the transmitting end by Bluetooth. The transmitting end calculates the position relation between the transmitting light source and the detecting module according to the position information, and adjusts the steering engine to enable the transmitting light source to be aligned to the detecting module. Therefore, the influence of multipath effect is reduced, and the quality and stability of communication are improved.
Specifically, the interference light source and the emission light source are placed on the steering engine in parallel directions, namely, the directions are aligned with the lens.
Further, the receiving end comprises a detection module, an aiming detection module and a demodulation module.
The detection module is in particular an organic detector with a dual-band narrow-band response and has a self-filtering characteristic, and the luminous wave band of the emission light source corresponds to the detection wave band of the detection module one by one and is used for receiving the modulation signal of the carrier wave; only to light of two or more specific wavelength bands. And transmitting and receiving the modulated optical signals with the specific wave bands through a wireless optical link, converting the modulated optical signals into electrical signals to be processed, and continuously transmitting the electrical signals to a demodulation module for demodulation processing of the signals.
In this embodiment, the detection module 131 can also be configured as a detector having a function of responding only to light of specific two or more wavelength bands, realized by its self-filtering characteristics. For the light signal of the external environment, the light conforming to the light response wave band of the detection module can be received due to the self-filtering characteristic of the detection module, and the light signal is matched with the light wave band corresponding to the double-channel emission light source. Therefore, the electric signal to be processed is obtained without being influenced by an interference light source and eliminating the interference of transmission signals of other communication channels.
The embodiment also comprises a reflecting cup and a Fresnel lens, wherein the reflecting cup is arranged in front of the emitting light source and can focus light beams and strengthen light rays. While fresnel lenses have the ability to focus the light beam, are placed in front of the detector, and have less loss of light intensity because they are thinner than typical lenses. Therefore, the signal-to-noise ratio is improved, and the transmission rate and the stability of communication are improved.
In addition, the detector adopted in the embodiment has the characteristics of self-filtering and narrow-band response, and can selectively perform light detection, so that after the Fresnel lens is adopted, the signal to noise ratio can be improved by the lens, and the interference caused by focusing the ambient light by the lens is reduced.
Further, the aiming detection module comprises an aiming detection panel, an integrator and a Bluetooth transmitter.
The aiming detection panel is specifically an array formed by a plurality of photoelectric detectors and is used for receiving light signals emitted by the interference light source;
The integrator is used for integrating and calculating the intensity of the light signals received by a plurality of points aiming at the detection panel, and taking the point with the strongest light signal intensity as the position of the emission light source.
The Bluetooth transmitter is used for sending the position information of the transmitting light source to the Bluetooth receiver, namely the aiming module.
Further, the demodulation module demodulates the optical signal in the reverse process.
The detection module converts the optical signal into a current signal, and an amplified voltage signal is obtained by using a Hall current sensor and a voltage amplifier. And carrying out restoration demodulation on the received voltage signal by demodulation to obtain ciphertext and a secret key.
Specifically, at the signal receiving end, the current signal is converted into an analog voltage signal through the Hall current sensor, and then the amplified voltage signal is obtained through the voltage amplifier, so that the demodulation module can demodulate the obtained electric signal more easily, a corresponding ciphertext and a corresponding secret key are obtained, and corresponding transmission content is further obtained.
It should be emphasized that in the present embodiment, during the signal transmission process, the interference optical signal is an optical signal with a random change of light intensity, and during the aiming phase, the interference optical signal is an optical signal with a stable light intensity.
In the embodiment, the encryption and decryption related codes are burned in the microcontroller in advance, and the microcontroller is used for controlling the soft encryption of the transmission content by adopting an AES-128bits encryption algorithm. The interfering light source (650 nm red light) then emits a light signal of stable intensity, which is received by the aiming detection panel. The microcontroller integrates the light intensity of each point of the aiming detection panel and calculates the position information of the emitting light source. The Bluetooth transmitter transmits the position information of the transmitting light source to a Bluetooth receiver at the transmitting end. And the microcontroller obtains the relative position relation between the emitting light source and the detecting module according to the position information of the emitting light source. The steering engine adjusts the direction of the emission light source according to the position relation, so that the emission light source points to the detection module, and the influence of multipath effect is reduced. An LED light source capable of emitting 450nm (blue light) and 880nm (infrared light) wavelengths is used in the light source module to emit a modulated light signal carrying a ciphertext key, and an interference light source (650 nm red light) is also added to perform interference. A reflecting cup is arranged in front of the LED light source, and a Fresnel lens is arranged in front of the detector to focus light beams and collect more light signals. The dual-band organic photoelectric detector also responds to only two corresponding light bands, and the response band is inconsistent with the light emitting band of the interference light source. One of the channels uses infrared light for transmission in order to increase the secrecy of the transmission process and thus the security of the transmitted content. Meanwhile, by utilizing the characteristic of dual-channel transmission, cipher text keys can be transmitted in different sequence arrangements, and the safety of the transmitted content is further improved. The adopted dual-band organic photoelectric detector has self-filtering characteristic, can effectively reduce the interference of surrounding environment light, and has the noise condition shown in figure 2. After the detector receives and converts the optical signal into a current signal, an I/V current-voltage conversion amplifying module integrating a Hall current sensor and a voltage amplifier is utilized to convert the current signal into an amplified voltage signal, a demodulation module is utilized to demodulate the voltage signal into binary data corresponding to a cipher text key, finally a microcontroller processes the binary data according to an internal code program, and the cipher text and the key are combined for decryption, and finally target transmission content is obtained on another computer, so that dual-band encrypted optical communication transmission is realized.
As shown in fig. 3, this embodiment further provides an encrypted optical communication method, which is applicable to a multiband/dual-band narrowband photodetector, including:
s101, carrying out algorithm soft encryption on the required transmission content to obtain a ciphertext and a secret key;
s102, respectively carrying out segmentation and marking treatment on the ciphertext and the secret key, and then carrying out signal modulation to obtain a ciphertext modulation carrier signal and a secret key modulation carrier signal;
S103, a ciphertext modulation carrier signal and a key modulation carrier signal are transmitted by utilizing different channels, and an interference light source emits an interference light signal at the moment, wherein the interference light signal is a signal with randomly changed light intensity;
s104, receiving the ciphertext modulation carrier signal and the key modulation carrier signal;
converting the received signal into a voltage signal to obtain a corresponding ciphertext and a key;
S105, recombining and restoring each group of ciphertext and the secret key according to the mark sequence, and combining the restored ciphertext and the secret key to obtain transmission content.
The invention combines the organic photoelectric detector with the indoor wireless optical communication system, and by virtue of the characteristics of adjustable self light response wave band, flexibility, self-filtering and the like of the used organic photoelectric detector, the invention is expected to integrate the receiving end on the wearable equipment and the miniature equipment, thereby promoting the realization of more application scenes and schemes which need high safety.
The embodiments described above are preferred embodiments of the present invention, but the embodiments of the present invention are not limited to the embodiments described above, and any other changes, modifications, substitutions, combinations, and simplifications that do not depart from the spirit and principles of the present invention should be made in the equivalent manner, and are included in the scope of the present invention.
Claims (8)
1. A multi-band/dual-band encrypted optical communication method, suitable for a multi-band/dual-band narrowband photodetector, comprising:
Carrying out algorithm soft encryption on the content to be transmitted to obtain ciphertext and a secret key;
the ciphertext and the secret key are respectively subjected to segmentation marking treatment, and then signal modulation is carried out to obtain a ciphertext modulation carrier signal and a secret key modulation carrier signal;
The method comprises the steps of utilizing different channels to send ciphertext modulation carrier signals and key modulation carrier signals, and enabling an interference light source to send interference light signals, wherein the interference light signals are signals with randomly changed light intensity;
Receiving a ciphertext modulated carrier signal and a key modulated carrier signal;
converting the received signal into a voltage signal to obtain a corresponding ciphertext and a key;
recombining and restoring each group of ciphertext and the secret key according to the mark sequence, and combining the restored ciphertext with the secret key to obtain transmission content;
The method comprises the steps of transmitting ciphertext modulation carrier signals and key modulation carrier signals by using different channels, wherein the step of transmitting interference light signals by an interference light source is preceded by a self-aiming step;
the self-aiming step includes:
transmitting an interference optical signal, wherein the interference optical signal is an optical signal with stable light intensity;
receiving an interference light signal, and determining the position information of a transmitting end according to the detected light intensity;
Returning the position information of the transmitting end to the transmitting end, and determining the position relation between the transmitting light source and the receiving end by the transmitting end according to the position information;
And the positions of the transmitting end and the receiving end are adjusted, so that the influence of multipath effect is reduced.
2. The multi-band/dual-band encrypted optical communication method according to claim 1, wherein the different channels correspond to different optical bands.
3. The multi-band/dual-band encrypted optical communication method according to claim 1, wherein the ciphertext modulated carrier signal and the key modulated carrier signal are transmitted using different channels, in particular using a random ordering.
4. A multi-band/dual-band encrypted optical communication system, comprising:
an encryption module: the method comprises the steps of carrying out algorithm soft encryption on the required transmission content to obtain ciphertext and a secret key;
Transmitting end: the device comprises an optical signal modulation module, a light source module and an aiming module;
The light source module comprises a double/multi-channel emission light source and an interference light source, wherein the emission light sources of at least two different channels randomly generate ciphertext carrier light signals and key carrier light signals, and the interference light source emits interference light;
The optical signal modulation module is used for modulating the ciphertext and the secret key to obtain a modulated signal of the carrier wave, and transmitting the modulated signal through wireless optical links of different channels;
The aiming module comprises a Bluetooth receiver, a receiving end and a receiving end, wherein the Bluetooth receiver is used for receiving the position information of the transmitting light source and calculating the position information of the receiving end according to the position information;
the receiving end comprises a detection module, an aiming detection module and a demodulation module;
the detection modules are used for receiving modulation signals of carriers, and the luminous wave bands of the emission light sources are in one-to-one correspondence with the detection wave bands of the detection modules;
The aiming detection module is used for receiving the light signals sent by the light source module, calculating and determining the position information of the light source module according to the light signals, and returning to the aiming module;
the demodulation module is used for obtaining a modulation signal, obtaining an amplified voltage signal, further obtaining a ciphertext and a secret key, and obtaining transmitted contents according to the ciphertext and the secret key;
and the microcontroller is connected with the encryption module, the transmitting end and the receiving end.
5. The multi-band/dual-band encrypted optical communication system according to claim 4, wherein the emission light source is further provided with a reflector cup.
6. The multi-band/dual-band encrypted optical communication system according to claim 5, wherein the steering engine is disposed at the bottom of the transmitting light source, and is configured to change the direction of the transmitting light source according to the position information of the receiving end, and align with the detection module.
7. The multi-band/dual-band encrypted optical communication system according to claim 6, wherein the detection module comprises an organic photodetector having a dual-band narrowband response and self-filtering characteristics, and a fresnel lens is disposed in front of the detector.
8. The multi-band/dual-band encrypted optical communication system according to claim 6, wherein the aiming detection module comprises an aiming detection panel, an integrator, and a bluetooth transmitter;
The aiming detection panel is specifically an array formed by a plurality of photoelectric detectors and is used for receiving light signals emitted by the interference light source;
The integrator is used for integrating and calculating the intensity of the light signals received by a plurality of points aiming at the detection panel, and taking the point with the strongest light signal intensity as the position of the emission light source;
The bluetooth transmitter is used for transmitting the position information of the transmitting light source to the bluetooth receiver.
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