CN111600656A - Indoor wireless optical communication device and method with stationary top end self-rotating user end - Google Patents
Indoor wireless optical communication device and method with stationary top end self-rotating user end Download PDFInfo
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Abstract
An indoor wireless optical communication device with a static top end self-rotating user end and a method belong to the technical field of wireless optical communication. In the device, a plurality of static top ends are distributed above a room, an optical signal transmitting and receiving window of each static top end faces to the right lower part of the room, a plurality of self-rotating user ends are positioned below the plurality of static top ends, and an optical signal transmitting and receiving head of each self-rotating user end can rotate automatically to keep the alignment state with the optical signal transmitting and receiving window of one static top end under the control of an attitude control module in each self-rotating user end. The method of the invention enables the optical signal transceiver head of the self-rotating user end to face the optical signal transmitting and receiving window at the top end of the static position, manually adjusts the optical signal transceiver head until the signal displayed and received by the user equipment is strongest, sets the attitude of the optical signal transceiver head at the moment as a zero position, and the optical signal transceiver head can keep a tracking state with the optical signal transmitting and receiving window under the control of the attitude control module in the self-rotating user end.
Description
Technical Field
The invention relates to an indoor wireless optical communication device with a static top end and a self-rotating user end and a method, belonging to the technical field of wireless optical communication.
Background
With the advent of the information age, communication technologies related to data processing and transmission, such as high-definition videos, large-scale network games, and network conference office collaboration, are gradually popularized, wherein a data transmission bandwidth belongs to a bottleneck technology.
Wireless optical communication has advantages of high speed, no electromagnetic interference, rich spectrum resources, no electromagnetic radiation, and high security, and attempts have been made to develop indoor wireless optical communication. Compared with the existing wireless local area network (wireless LAN), the indoor wireless optical communication also uses light as a carrier to transmit signals, the communication speed can reach the order of gigabits per second, and the transmission speed still has room for improvement. However, wireless optical communication also has its limitations, for example, compared with radio communication, the directivity of optical transmission is stronger, on the premise of ensuring user experience, two communication ends need higher alignment precision when communicating, so that it can ensure higher utilization rate of optical energy while realizing optical communication, however, to realize accurate alignment, the requirements for alignment and tracking devices are extremely high, which inevitably causes the structure of the optical communication system to become complicated, the cost to be increased, and is not beneficial to popularization and application; if the alignment precision is reduced, the beam divergence angle of the communication light beam needs to be increased, the light beam coverage is enlarged, and the energy loss is inevitably increased; in order to compensate for the energy loss and ensure the signal strength, the emission power of the communication light must be increased, and thus the load of the optical communication system is increased, and the actual light emitting power of the light emitting devices such as LD and LED is also limited.
In order to solve the problems, a Chinese patent with patent number ZL201610578152.9 provides a multi-user visible light communication device and a method adopting a plurality of rotatable top ends, the scheme is that the plurality of rotatable top ends are arranged, when a swimming user appears in a communication area, the plurality of rotatable top ends are driven by respective two-dimensional rotating mechanisms, the respective cameras are aligned to the swimming user, the shot black and white images are transmitted to the same optical fiber exchange and system integrated controller, and the communication relation is established between one rotatable top end and the swimming user through gray value judgment, so that space full coverage is realized, and no dead angle exists in communication. However, although the solution solves the problem of alignment and tracking of the indoor wireless optical communication system, and the beam divergence angle and the light emission power demand are reasonable, the solution needs to arrange a plurality of rotatable top ends, each rotatable top end is equipped with a two-dimensional rotating mechanism and a camera, and an optical fiber switching and system integrated controller is also needed to be arranged, so that the design and manufacture of the multi-user visible light communication device become very complicated and the cost is very high while the two-way data transmission between the external network and the user is realized, and one of the rotatable top ends is controlled and the communication relationship with a certain user terminal is finally determined; according to the evaluation on the aspect of the method, as long as one user enters the communication room, or as long as one user moves in the communication room, almost all the rotatable top ends can enter the working state, when one user is determined, the rest can exit, and when another user seeks communication, the process is repeated. However, in real-world situations, such as a writing room, where not all indoor wireless optical communication users are in frequent movements, each user position is relatively fixed, limited activities may only occur within a single overhead coverage area, and wireless optical communication may be effective and maintain normal communication as long as the user end of the user can keep aligning and tracking with the overhead above the user end.
Disclosure of Invention
In order to provide an indoor wireless optical communication scheme, the scheme is more suitable for users with relatively fixed positions and infrequent swimming, the structure of a communication device is relatively simple, and meanwhile, the cost is low, the invention provides the indoor wireless optical communication device with the stationary top end self-rotating user end and the method.
The invention discloses an indoor wireless optical communication device with a static top end self-rotating user end, which is characterized in that a plurality of static top ends are dispersedly arranged at the upper part indoors, an optical signal transmitting and receiving window of each static top end faces towards the right lower part indoors, each static top end is respectively connected with the same optical fiber router through an optical fiber from an optical fiber interface of each static top end, and the static top ends and the optical fiber routers mutually transmit data; the optical fiber router is provided with an optical fiber interface for entering a home; the plurality of self-rotating user terminals are positioned below the plurality of static top ends, and the static top ends and the self-rotating user terminals can be in wireless optical communication with each other; the optical signal transmitting and receiving head of the self-rotating user end can rotate automatically under the control of the attitude control module in the self-rotating user end so as to keep the alignment state with the optical signal transmitting and receiving window at the top end of a certain static position; each self-rotation user end is provided with a USB interface.
An indoor wireless optical communication method with a stationary top end self-rotating user end is characterized in that an optical fiber router is connected with an external network, and the self-rotating user end is directly plugged in user equipment through a USB interface; the downlink data from the external network is transmitted to the static top end through the optical fiber router for format conversion and signal modulation, and then is transmitted in the form of optical signals; the uploading data from the user equipment is subjected to format adjustment and signal modulation by a self-rotating user terminal and then is transmitted in an optical signal form; the optical signal transmitting and receiving window arranged at the top of the static position above the indoor faces to the right lower part of the indoor and keeps the facing direction, and a signal coverage area is formed below the indoor; the optical signal transceiving head of the self-rotating user end entering the signal coverage area along with the user equipment faces the optical signal transmitting and receiving window at the top end of the static position, the optical signal transceiving head is manually adjusted until the user equipment displays the received signal to be strongest, the attitude of the optical signal transceiving head at the moment is set to be a zero position, and the azimuth angle and the pitch angle at the moment are initial attitude values; then, in the using process of the user equipment, the attitude change of the user equipment causes the change of the attitude initial value of the self-rotating user end, under the control of an attitude control module in the self-rotating user end, the optical signal transceiver can self-rotate in the azimuth direction and the pitching direction, the azimuth angle and the pitching angle are recovered to the attitude initial value, the tracking state between the optical signal transceiver and the optical signal transmitting and receiving window is kept, and the optical communication between the static top end and the self-rotating user end is maintained.
The technical effects of the present invention are shown in two aspects. On one hand, the device is represented on a communication device, the top end is static, a plurality of static top ends are uniformly distributed above a room or distributed at fixed points according to needs, the beam divergence angle of a signal light source of each static top end is about 5 degrees, an effective signal coverage area of a work station in a writing room can be formed at a position about 2 m-3 m below the static top end, and a light-emitting device in the top end and a user side is not required to have larger light-emitting power, and a photoelectric device in the top end and the user side is not required to have higher detection sensitivity; the user side has a simple self-rotating structure, and the optical signal transmitting and receiving head of the self-rotating user side can be aligned and tracked to the optical signal transmitting and receiving window at the top end of the static position under the control of the attitude control module; the plurality of stationary set-top ends are connected with the external network through a fiber router. Therefore, in the communication device, the black-and-white image gray value control technology in the prior art is not adopted any more, a plurality of cameras and optical fiber exchange and system integrated controllers are omitted, the structure of the device is simplified, the cost is reduced, the energy consumption and the volume are greatly reduced, and the communication device is easy to popularize and apply. The invention has the technical effects that on the other hand, in the communication method, after the alignment of a user end and a top end is directly realized in a manual mode, the attitude control module controls the optical signal transmitting and receiving head to keep the zero attitude of the optical signal transmitting and receiving head, so that the tracking between two ends of optical communication can be kept.
Drawings
Fig. 1 is a schematic diagram of a layout of an optical signal transmitting and receiving window in a stationary-top end of an indoor wireless optical communication device with a stationary-top end self-rotating subscriber end according to the present invention.
Fig. 2 is a schematic block diagram of a stationary-top structure in an indoor wireless optical communication device with a stationary-top self-rotating subscriber end according to the present invention, which simultaneously illustrates the working relationship between the stationary-top and the optical fiber router and the self-rotating subscriber end.
Fig. 3 is a schematic block diagram of a self-rotation subscriber end structure in an indoor wireless optical communication device with a stationary subscriber end self-rotation subscriber end according to the present invention, which simultaneously illustrates the working relationship between the self-rotation subscriber end and the subscriber device, stationary subscriber end.
Fig. 4 is a schematic perspective view of the external shape and structure of the self-rotation subscriber end in the indoor wireless optical communication device with the stationary subscriber end and the self-rotation subscriber end according to the present invention, which is also taken as an abstract figure.
Detailed Description
The embodiment of the wireless optical communication device with a stationary top end self-rotating user terminal indoor of the present invention is as follows.
The plurality of static top ends are dispersedly arranged at the upper part indoors, the optical signal transmitting and receiving window 1 at each static top end faces to the lower part indoors, each static top end is respectively connected with the same optical fiber router through optical fibers from an optical fiber interface of the static top end, and the static top ends and the optical fiber routers mutually transmit data; the optical fiber router is provided with an optical fiber interface for entering a home.
In the static top end, as shown in fig. 1 and fig. 2, the optical fiber interface module, the switching control module and the format conversion module are electrically connected in sequence, and the format conversion module is further electrically connected with the signal processing module and the light-emitting driving module respectively; the signal processing module is also electrically connected with the photoelectric conversion device, and the light-emitting driving module is also electrically connected with the photoelectric conversion device; the receiving optical system 2 is positioned in the middle of the optical signal transmitting and receiving window 1, and the photosensitive surface of the photoelectric conversion device is positioned at the image surface of the receiving optical system 2; the emission optical system 3 is positioned at the edge of the optical signal emission and reception window 1, and the light-emitting point of the electro-optical conversion device is positioned at the object focus of the emission optical system 3; the optical axis of the receiving optical system 2 is parallel to the optical axis of the transmitting optical system 3; one end of the power supply module is externally connected with commercial power, and the other end of the power supply module respectively supplies power for the exchange control module, the format conversion module, the signal processing module and the light-emitting driving module.
The optical fiber interface module is a 20km grade 1.25Gbps PSLC interface single-mode single-fiber SFP optical fiber communication module.
The exchange control module and the format conversion module adopt a VSC8211 type network-optical fiber conversion integrated chip, a self-adaptive compatible speed 10/100/1000M network protocol and an SFP optical fiber communication module.
The signal processing module and the light-emitting driving module adopt GN25L95 integrated chips; in the signal processing module, a trans-impedance amplifier and a limiting amplifier are arranged, the signal-to-noise ratio of a signal is optimized by the trans-impedance amplifier, and the level format of the signal is adjusted by the limiting amplifier; the maximum driving current of the light-emitting driving module is 100mA, the temperature and current control module is arranged in the light-emitting driving module, and the light-emitting power of the electro-optical conversion device can be controlled in real time by reading data output by a photoelectric detector in the electro-optical conversion device.
The photoelectric conversion device adopts an Avalanche Photodiode (APD), and the detection sensitivity is-32 dBm.
The electro-optical conversion device adopts a Light Emitting Diode (LED) or a Laser Diode (LD), the emitting power of the adopted laser diode is 50 mW-100 mW, the beam divergence angle is 5 degrees, and the wavelength is 1550 nm.
The receiving optical system is a large-field-angle optical system to reduce the requirement on the alignment tracking precision of the optical signal receiving and transmitting head of the self-rotating user terminal, and the large-field-angle optical system is formed by a single-chip aspheric convex lens, the aperture is 50mm, and the focal length is 35 mm.
The transmitting optical system is a large-numerical-aperture optical system and can provide a large signal coverage area for a self-rotating user side, the large-numerical-aperture optical system is formed by a single-chip aspheric convex lens, the aperture is 8mm, the focal length is 12mm, and the mirror surface is plated with an anti-reflection film for wave band reflection of an electro-optical conversion device.
The power module is internally provided with 3 SX2016 type direct current voltage stabilizing chips and supporting circuits, and the SX2016 type direct current voltage stabilizing chips can output different voltages by matching different supporting circuits and resistors, so that the 3 SX2016 type direct current voltage stabilizing chips respectively provide 1.2V direct current for the exchange control module, provide 3.3V direct current for the format conversion module, and provide 3.3V direct current for the signal processing module and the light-emitting driving module.
The plurality of self-rotating user terminals are positioned below the plurality of static top ends, and the static top ends and the self-rotating user terminals can be in wireless optical communication with each other; the optical signal transmitting and receiving head of the self-rotating user end can rotate automatically under the control of the attitude control module in the self-rotating user end so as to keep the alignment state with the optical signal transmitting and receiving window at the top end of a certain static position; each self-rotation user end is provided with a USB interface.
In the self-rotation user terminal, as shown in fig. 3, the USB interface is electrically connected to the interface module, and the interface module is further electrically connected to the user terminal signal processing module and the user terminal light-emitting driving module, respectively; the user side signal processing module is also electrically connected with a user side photoelectric conversion device, and the user side light-emitting driving module is also electrically connected with a user side photoelectric conversion device; the photosensitive surface of the photoelectric conversion device of the user side is positioned at the image surface of the receiving optical system of the user side; the light-emitting point of the user-side electro-optical conversion device is positioned at the object focus of the user-side emission optical system; one end of the user side power supply module is connected with the USB interface, and the other end of the user side power supply module respectively supplies power to the user side signal processing module, the user side light-emitting driving module and the attitude control module; the attitude control module is also electrically connected with the azimuth driving motor and the pitching driving motor respectively; as shown in fig. 4, the client transmitting optical system, the client electro-optical conversion device, the client receiving optical system, and the client electro-optical conversion device are installed in the optical transceiver 4, wherein the client receiving optical system 5 is located in the middle of the upper end of the optical transceiver 4, and the client transmitting optical system 6 is located at the edge of the upper end of the optical transceiver 4; the optical axis of the user end receiving optical system 5 is parallel to the optical axis of the user end transmitting optical system 6; the rotating shaft of the azimuth driving motor 7 is fixedly connected with an azimuth turntable 8, a U-shaped bracket 10 is arranged on the azimuth turntable 8, the rotating shaft of the pitching driving motor 9 is supported by the U-shaped bracket 10, the rotating shaft of the pitching driving motor 9 is fixedly connected with the bottom of the optical signal transmitting and receiving head 4, and the geometric axis of the rotating shaft of the pitching driving motor 9 is vertical to and intersected with the geometric axis of the rotating shaft of the azimuth driving motor 7; the azimuth driving motor is arranged at the upper end of the base 11; the user side light-emitting driving module, the user side signal processing module, the interface module, the user side power supply module and the attitude control module are installed in the base 11, and the USB interface 12 is installed at the lower end of the base 11.
The USB interface is Type-c Type, and the size is less, can two-sided plug.
The interface module is acted by an AX88179 chip, and directly obtains 5V direct current from user equipment through a USB interface and converts the voltage into 3.3V working voltage.
The user side signal processing module and the user side light-emitting driving module adopt MAX3738 integrated chips; in a user side signal processing module, a trans-impedance amplifier and a limiting amplifier are arranged, the signal-to-noise ratio of a signal is optimized by the trans-impedance amplifier, and the signal level format is adjusted by the limiting amplifier; the maximum driving current of the user-side light-emitting driving module is 60mA, the temperature and current control module is arranged in the user-side light-emitting driving module, and the temperature and the light-emitting power of the electro-optical conversion device can be controlled in real time by reading data output by a photoelectric detector in the electro-optical conversion device of the user side.
The photoelectric conversion device of the user terminal adopts an Avalanche Photodiode (APD), and the detection sensitivity is-32 dBm.
The user side electro-optical conversion device adopts a Light Emitting Diode (LED) or a Laser Diode (LD), the communication speed can be faster by adopting the laser diode compared with the light emitting diode, and the emission power of the adopted laser diode is 12 mW.
The user side receiving optical system adopts a single-chip aspheric convex lens with the aperture of 5mm and the focal length of 6mm, and the mirror surface is plated with a 1550nm waveband antireflection film of a static top electro-optical conversion device.
The user side emission optical system adopts a single-chip aspheric convex lens with the aperture of 3mm and the focal length of 5 mm.
The user side power supply module is internally provided with 2 SX2016 type direct current voltage stabilizing chips and a matching circuit, wherein the 2 SX2016 type direct current voltage stabilizing chips acquire 5V direct current from user equipment through a USB interface, then convert the voltage into 3.3V direct current respectively, and supply power for an MAX3738 integrated chip (a user side signal processing module and a user side light-emitting driving module) and an attitude control module respectively through voltage stabilizing and current stabilizing output.
An ideographic semiconductor STM32 series STM32F437 type ARM control chip and an MTI-10 type MEMS integrated module are arranged in the attitude control module; the core frequency of the ARM control chip is 180MHz, and 5 compatible Digital Signal Controllers (DSC) are respectively connected with a three-axis accelerometer, a three-axis gyroscope, a three-axis magnetometer, an azimuth driving motor and a pitching driving motor; the three-axis accelerometer, the three-axis gyroscope and the three-axis magnetometer are positioned in an MTI-10 type MEMS integrated module; the azimuth driving motor and the pitching driving motor are direct-current brush motors; photoelectric encoders are arranged in the azimuth driving motor and the pitching driving motor, a grating code disc which can rotate and is carved with fine scales is clamped between a laser emitter and a photoelectric sensor, and the rotation state of the motors is read in real time; the ARM control chip reads out triaxial acceleration, angular acceleration and magnetic force data from the MEMS integrated module respectively, compares the data with zero-position posture corresponding data of the optical signal transceiving head to obtain correction angles of an azimuth angle and a pitch angle, and outputs pwm signals to control the azimuth driving motor and the pitch driving motor to perform correction actions, so that the optical signal transceiving head keeps the zero-position posture.
The embodiment of the indoor wireless optical communication method with stationary-top self-rotating subscriber end of the present invention is as follows.
The indoor wireless optical communication method of the self-rotating user side with the static top end is characterized in that an optical fiber router is connected with an external network, and the self-rotating user side is directly plugged on user equipment through a USB interface.
The method comprises the following steps that the downloaded data from the external network is transmitted to a static top end through an optical fiber router to be subjected to format conversion and signal modulation, and then is transmitted in an optical signal form, and the specific process is as follows: as shown in fig. 2, the optical signal of the download data is converted into an electrical signal by the optical fiber interface module, and then the electrical signal is sent to the format conversion module by the switching control module for signal format conversion, so as to meet the requirement of the light-emitting driving module on the format of the input signal; the light emitting driving module modulates the signal by controlling the light emitting intensity of the electro-optical conversion device, converts the signal into an optical signal by the electro-optical conversion device, and monitors the temperature and the light emitting power of the electro-optical conversion device in real time; the optical signal is emitted by the emission optical system according to a certain beam divergence angle and then forms a signal coverage area below the static top end.
The method comprises the following steps that format adjustment and signal modulation are carried out on uploaded data from user equipment by a self-rotating user terminal, and then the data are transmitted in an optical signal mode, and the specific process is as follows: as shown in fig. 3, the upload data electrical signal is sent to the interface module by the USB interface, and the interface module performs signal format conversion to meet the requirement of the user-side light-emitting driving module on the input signal format; the user side light-emitting driving module modulates the signals by controlling the light-emitting intensity of the user side electro-optical conversion device, converts the signals into optical signals by the user side electro-optical conversion device, and monitors the temperature and the light-emitting power of the user side electro-optical conversion device in real time; and the optical signal is collimated and emitted by the user side emission optical system and then irradiates to the static top end.
The optical signal transmitting and receiving window arranged at the top end of the static position above the indoor faces to the right lower part of the indoor and keeps the facing direction, and a signal coverage area is formed below the indoor; the optical signal transceiving head of the self-rotating user end entering the signal coverage area along with the user equipment faces the optical signal transmitting and receiving window at the top end of the static position, the optical signal transceiving head is manually adjusted until the user equipment displays the received signal to be strongest, the attitude of the optical signal transceiving head at the moment is set to be a zero position, and the azimuth angle and the pitch angle at the moment are initial attitude values; then, in the using process of the user equipment, the attitude change of the user equipment causes the change of the attitude initial value of the self-rotating user end, under the control of an attitude control module in the self-rotating user end, the optical signal transceiver can self-rotate in the azimuth direction and the pitching direction, the azimuth angle and the pitching angle are recovered to the attitude initial value, the tracking state between the optical signal transceiver and the optical signal transmitting and receiving window is kept, and the optical communication between the static top end and the self-rotating user end is maintained.
The specific process of tracking the optical signal transmitting and receiving head and the optical signal transmitting and receiving window is as follows: setting the attitude of the optical signal transceiver head to be a zero position means that data of a triaxial accelerometer, a triaxial gyroscope and a triaxial magnetometer in an attitude control module in a self-rotating user side are recorded as the zero position, then the triaxial accelerometer measures triaxial acceleration in real time, the triaxial gyroscope measures triaxial angular acceleration in real time, the triaxial magnetometer can measure triaxial magnetic force change in real time, the attitude control module analyzes the obtained spatial attitude information, the spatial attitude of the optical signal transceiver head at the current moment is obtained by calculation and is compared with the zero position attitude to obtain an attitude adjustment quantity, and the azimuth angle and the pitch angle of the optical signal transceiver head are controlled on an attitude initial value by controlling the rotation of an azimuth driving motor and a pitch driving motor, so that the optical signal transceiver head and an optical signal transmitting and receiving window are tracked; the optical signal transmitting and receiving head has a self-rotation angle range of 0-180 degrees in the azimuth direction and a self-rotation angle range of 0-90 degrees in the pitching direction.
After keeping the tracking state between the optical signal transceiver and the optical signal transmitting/receiving window, the optical signal transmitted from the stationary top end is transmitted through the atmospheric channel and then received by the user-side receiving optical system in the self-rotating user side, as shown in fig. 3, and converged on the photosensitive surface of the user-side photoelectric conversion device, the optical signal is converted into an electrical signal by the user-side photoelectric conversion device and then output to the user-side signal processing module, the trans-impedance amplifier and the limiting amplifier in the user-side signal processing module perform signal-to-noise ratio optimization and level format adjustment respectively, and then the electrical signal is transmitted to the interface module, and the signal data format is adjusted by the interface module to meet the requirement of the USB interface and then transmitted to the user equipment through the USB interface, thereby completing the reception of the downlink data.
After keeping the tracking state between the optical signal transmitting/receiving head and the optical signal transmitting/receiving window, the optical signal transmitted from the self-rotating user end is transmitted through the atmospheric channel and then received by the receiving optical system in the stationary top end, as shown in fig. 2, and converged on the photosensitive surface of the photoelectric conversion device, the photoelectric conversion device converts the optical signal into an electrical signal and outputs the electrical signal to the signal processing module, the trans-impedance amplifier and the limiting amplifier in the signal processing module respectively perform signal-to-noise ratio optimization and level format adjustment, then transmit the electrical signal to the format conversion module to adjust the format of the signal data to meet the requirements of the optical fiber interface module, then transmit the optical fiber interface module by the switching control module, and finally transmit the optical signal to the optical fiber router by the optical fiber interface module, thereby completing the transmission of the uploaded data.
Claims (7)
1. An indoor wireless optical communication device with a static top end self-rotating user side is characterized in that a plurality of static top ends are dispersedly arranged above a room, an optical signal transmitting and receiving window of each static top end faces to the right lower side of the room, each static top end is respectively connected with the same optical fiber router through an optical fiber from an optical fiber interface of each static top end, and the static top ends and the optical fiber routers transmit data with each other; the optical fiber router is provided with an optical fiber interface for entering a home; the plurality of self-rotating user terminals are positioned below the plurality of static top ends, and the static top ends and the self-rotating user terminals can be in wireless optical communication with each other; the optical signal transmitting and receiving head of the self-rotating user end can rotate automatically under the control of the attitude control module in the self-rotating user end so as to keep the alignment state with the optical signal transmitting and receiving window at the top end of a certain static position; each self-rotation user end is provided with a USB interface.
2. The indoor wireless optical communication device with the stationary top end and the self-rotating user end as claimed in claim 1, wherein in the stationary top end, the optical fiber interface module, the switching control module and the format conversion module are electrically connected in sequence, and the format conversion module is further electrically connected with the signal processing module and the light emitting driving module respectively; the signal processing module is also electrically connected with the photoelectric conversion device, and the light-emitting driving module is also electrically connected with the photoelectric conversion device; the receiving optical system (2) is positioned in the middle of the optical signal transmitting and receiving window (1), and the photosensitive surface of the photoelectric conversion device is positioned at the image surface of the receiving optical system (2); the emission optical system (3) is positioned at the edge of the optical signal emission and reception window (1), and the light-emitting point of the electro-optical conversion device is positioned at the object focus of the emission optical system (3); the optical axis of the receiving optical system (2) is parallel to the optical axis of the transmitting optical system (3); one end of the power supply module is externally connected with commercial power, and the other end of the power supply module respectively supplies power for the exchange control module, the format conversion module, the signal processing module and the light-emitting driving module.
3. The indoor wireless optical communication device of claim 1, wherein in the self-rotating subscriber terminal, the USB interface is electrically connected to the interface module, and the interface module is further electrically connected to the subscriber terminal signal processing module and the subscriber terminal light-emitting driving module, respectively; the user side signal processing module is also electrically connected with a user side photoelectric conversion device, and the user side light-emitting driving module is also electrically connected with a user side photoelectric conversion device; the photosensitive surface of the photoelectric conversion device of the user side is positioned at the image surface of the receiving optical system of the user side; the light-emitting point of the user-side electro-optical conversion device is positioned at the object focus of the user-side emission optical system; one end of the user side power supply module is connected with the USB interface, and the other end of the user side power supply module respectively supplies power to the user side signal processing module, the user side light-emitting driving module and the attitude control module; the attitude control module is also electrically connected with the azimuth driving motor and the pitching driving motor respectively; the optical system for transmitting the user side, the electro-optical conversion device for the user side, the optical system for receiving the user side and the photoelectric conversion device for the user side are arranged in the optical signal receiving and transmitting head (4), wherein the optical system for receiving the user side (5) is positioned in the middle of the upper end of the optical signal receiving and transmitting head (4), and the optical system for transmitting the user side (6) is positioned at the edge of the upper end of the optical signal receiving and transmitting head (4); the optical axis of the user side receiving optical system (5) is parallel to the optical axis of the user side transmitting optical system (6); a rotating shaft of the azimuth driving motor (7) is fixedly connected with an azimuth turntable (8), a U-shaped support (10) is arranged on the azimuth turntable (8), the rotating shaft of the pitching driving motor (9) is supported by the U-shaped support (10), the rotating shaft of the pitching driving motor (9) is fixedly connected with the bottom of the optical signal transmitting and receiving head (4), and the geometric axis of the rotating shaft of the pitching driving motor (9) is vertical to and intersected with the geometric axis of the rotating shaft of the azimuth driving motor (7); the azimuth driving motor is arranged at the upper end of the base (11); the user side light-emitting driving module, the user side signal processing module, the interface module, the user side power supply module and the attitude control module are installed in the base (11), and the USB interface (12) is installed at the lower end of the base (11).
4. An indoor wireless optical communication method with a stationary top end self-rotating user end is characterized in that an optical fiber router is connected with an external network, and the self-rotating user end is directly plugged in user equipment through a USB interface; the downlink data from the external network is transmitted to the static top end through the optical fiber router for format conversion and signal modulation, and then is transmitted in the form of optical signals; the uploading data from the user equipment is subjected to format adjustment and signal modulation by a self-rotating user terminal and then is transmitted in an optical signal form; the optical signal transmitting and receiving window arranged at the top of the static position above the indoor faces to the right lower part of the indoor and keeps the facing direction, and a signal coverage area is formed below the indoor; the optical signal transceiving head of the self-rotating user end entering the signal coverage area along with the user equipment faces the optical signal transmitting and receiving window at the top end of the static position, the optical signal transceiving head is manually adjusted until the user equipment displays the received signal to be strongest, the attitude of the optical signal transceiving head at the moment is set to be a zero position, and the azimuth angle and the pitch angle at the moment are initial attitude values; then, in the using process of the user equipment, the attitude change of the user equipment causes the change of the attitude initial value of the self-rotating user end, under the control of an attitude control module in the self-rotating user end, the optical signal transceiver can self-rotate in the azimuth direction and the pitching direction, the azimuth angle and the pitching angle are recovered to the attitude initial value, the tracking state between the optical signal transceiver and the optical signal transmitting and receiving window is kept, and the optical communication between the static top end and the self-rotating user end is maintained.
5. The method according to claim 4, wherein the optical signal of the downlink data is converted into an electrical signal by the optical fiber interface module, and the electrical signal is sent to the format conversion module by the switching control module for signal format conversion, so as to meet the requirement of the light-emitting driving module on the format of the input signal; the light emitting driving module modulates the signal by controlling the light emitting intensity of the electro-optical conversion device, converts the signal into an optical signal by the electro-optical conversion device, and monitors the temperature and the light emitting power of the electro-optical conversion device in real time; the optical signal is emitted by the emission optical system according to a certain beam divergence angle and then forms a signal coverage area below the static top end.
6. The method according to claim 4, wherein the upload data electrical signal is transmitted from the USB interface to the interface module, and the interface module performs signal format conversion to meet the requirement of the user-side light-emitting driver module for the input signal format; the user side light-emitting driving module modulates the signals by controlling the light-emitting intensity of the user side electro-optical conversion device, converts the signals into optical signals by the user side electro-optical conversion device, and monitors the temperature and the light-emitting power of the user side electro-optical conversion device in real time; and the optical signal is collimated and emitted by the user side emission optical system and then irradiates to the static top end.
7. The method of claim 4, wherein the specific process of tracking the optical signal transceiver and the optical signal transmitting/receiving window comprises: setting the attitude of the optical signal transceiver head to be a zero position means that data of a triaxial accelerometer, a triaxial gyroscope and a triaxial magnetometer in an attitude control module in a self-rotating user side are recorded as the zero position, then the triaxial accelerometer measures triaxial acceleration in real time, the triaxial gyroscope measures triaxial angular acceleration in real time, the triaxial magnetometer can measure triaxial magnetic force change in real time, the attitude control module analyzes the obtained spatial attitude information, the spatial attitude of the optical signal transceiver head at the current moment is obtained by calculation and is compared with the zero position attitude to obtain an attitude adjustment quantity, and the azimuth angle and the pitch angle of the optical signal transceiver head are controlled on an attitude initial value by controlling the rotation of an azimuth driving motor and a pitch driving motor, so that the optical signal transceiver head and an optical signal transmitting and receiving window are tracked; the optical signal transmitting and receiving head has a self-rotation angle range of 0-180 degrees in the azimuth direction and a self-rotation angle range of 0-90 degrees in the pitching direction.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112165357A (en) * | 2020-09-29 | 2021-01-01 | 沈宏岩 | Access scheduling system for multiple users of optical base station and operation process thereof |
| CN114337830A (en) * | 2021-12-30 | 2022-04-12 | 网络通信与安全紫金山实验室 | Mobile optical communication transceiver and transceiver system based on optical module architecture |
| WO2023040228A1 (en) * | 2021-09-17 | 2023-03-23 | 湖北文理学院 | Visible light positioning assisted multi-user light communication system and method |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112165357A (en) * | 2020-09-29 | 2021-01-01 | 沈宏岩 | Access scheduling system for multiple users of optical base station and operation process thereof |
| CN112165357B (en) * | 2020-09-29 | 2022-10-18 | 四川高艺光学科技有限公司 | Access scheduling system for multiple users of optical base station and operation process thereof |
| WO2023040228A1 (en) * | 2021-09-17 | 2023-03-23 | 湖北文理学院 | Visible light positioning assisted multi-user light communication system and method |
| CN114337830A (en) * | 2021-12-30 | 2022-04-12 | 网络通信与安全紫金山实验室 | Mobile optical communication transceiver and transceiver system based on optical module architecture |
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