CN218772094U - Portable ultraviolet light communication device - Google Patents
Portable ultraviolet light communication device Download PDFInfo
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- CN218772094U CN218772094U CN202222670292.2U CN202222670292U CN218772094U CN 218772094 U CN218772094 U CN 218772094U CN 202222670292 U CN202222670292 U CN 202222670292U CN 218772094 U CN218772094 U CN 218772094U
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Abstract
The utility model relates to an ultraviolet light communication technology field, concretely relates to portable ultraviolet light communication device, including transmitter and receiver, the transmitter includes modulator, drive circuit and ultraviolet light source that circuit connection in proper order, and the transmitter still includes first bottom plate, transmission circuit board, transmission casing, first battery and radiator fan, is formed with the heat dissipation through-hole that corresponds with radiator fan's gas outlet on the first bottom plate; the receiver comprises an optical detector, a signal preprocessing circuit and a demodulator which are sequentially connected by a circuit. The utility model has the advantages that: the portability of the mobile phone is ensured; the device is beneficial to the scattering of ultraviolet light, and avoids the influence of the shielding of ultraviolet light sources on the scattering of the ultraviolet light, thereby reducing the transmission loss of the ultraviolet light and being beneficial to the transmission and the receiving of optical signals.
Description
Technical Field
The utility model relates to an ultraviolet ray communication technical field, concretely relates to lightweight ultraviolet ray communication device.
Background
The military communication means are mainly radio communication, wired communication and optical communication, and are described as follows.
(1) Radio communication is communication means for transmitting information by radio waves. The advantages of rapid establishment, flexibility and the like are achieved due to the fact that the laying of the line is omitted. Telephone, television, data, image information can be transmitted by radio. Radio can reflect, refract, diffract and propagate, and can establish communication with troops with uncertain directions and isolated by natural objects. However, radio waves are easily intercepted and interfered by enemies, and encryption processing needs to be carried out on transmission data in actual use.
(2) Wired communication, utilize the wire to transmit the electric signal, the communication quality is good, stability is high, is the important means in the military communication. In wartime, when meeting the geographic environment with complex terrain, the line laying difficulty is large, the construction time is long, the line is easy to be damaged by enemies, and the later maintenance is difficult.
(3) Optical communication, which undergoes two main stages, optical fiber communication and wireless optical communication. As the name implies, optical fiber communication, i.e., the transmission of information by optical fiber, has attracted attention in recent thirty years, and plays a significant role in the field of modern communication, and has become one of mainstream communication means. The optical fiber transmission device takes light waves as a carrier and optical fibers as a transmission medium, and has the characteristics of wide frequency band, high confidentiality, large transmission capacity, strong anti-electromagnetic interference capability and the like. But as with wired communications, it has poor mobility and poor mechanical strength because the optical fiber is brittle. The wireless optical communication has the advantages of optical fiber communication, reduces the influence of optical fibers and the like, and is an important direction for the development of military communication.
(4) Quantum communication refers to a novel communication mode for information transmission by using quantum entanglement effect. Quantum communication is a novel interdiscipline developed in the last two decades and is a new research field combining quantum theory and information theory. Quantum communication mainly involves: the subject of quantum cryptography communication, quantum remote transmission, quantum dense coding, etc. has gradually moved from theory to experiment and developed to practicality recently, and is still under study.
In summary, the conventional communication means plays an important role in military communication, but has some disadvantages. For example, radio and microwave communications are relatively easy to eavesdrop, interfere and destroy, and are not suitable for occasions of electromagnetic silence; wired communication and optical fiber communication require pre-phase-laid lines and cannot achieve flexibility, mobility and rapid response. In order to be unsuspected in future war and better adapt to complicated and variable war time geographic environment, countries are continuously seeking a new, more concealed, safer and less interfered means robust and sturdy, and ultraviolet light wireless communication is emerging under this requirement.
Ultraviolet light communication is based on two interrelated physical phenomena: firstly, ozone in the atmospheric layer has a strong absorption effect on ultraviolet light with the wavelength of 200nm to 300nm, the area is called a solar blind area, and ultraviolet radiation of the solar blind area reaching the ground is almost attenuated to zero near the sea level; another phenomenon is that the sun blind zone uv light on the earth's surface is strongly scattered by the atmosphere. The existence of the solar blind area provides a good communication background for the ultraviolet light communication system working in the wave band. The scattering action of ultraviolet light in the atmosphere changes the energy transmission direction of the ultraviolet light, which lays a communication foundation for ultraviolet light communication, but the attenuation caused by the absorption action limits the transmission of the ultraviolet light within a certain distance.
Ultraviolet light communication is a wireless optical communication technology based on atmospheric scattering and absorption. The basic principle is that the spectrum of the solar blind area is used as a carrier, an information electric signal is modulated and loaded on the ultraviolet light carrier at a transmitting end, the modulated ultraviolet light carrier signal is transmitted by utilizing the atmospheric scattering effect, an optical communication link is established at a receiving end through the capture and tracking of ultraviolet light beams, and the information signal is extracted through photoelectric conversion and demodulation processing. The ultraviolet communication is particularly suitable for near-distance anti-interference secret communication in a complex environment. The basic structure and implementation of the uv communication system are briefly described as follows.
(1) Basic structure
Referring to fig. 1, an ultraviolet light communication system generally consists of a transmitter and a receiver, wherein the transmitter converts an original electrical signal generated by a source into a signal suitable for transmission in a channel; the receiver recovers the corresponding original signal from the received signal with the interference.
(2) Principle of operation
The transmitting system consists of an information source module, a modulation module, a driving circuit, an ultraviolet light source and the like, and the working process is as follows: the modulation module modulates and transforms the electric signal generated by the information source module by adopting a specific modulation mode, and then completes photoelectric conversion coding through a driving circuit of the transmitting end, so that the ultraviolet light source transmits modulation information along with an ultraviolet light carrier.
The receiving system consists of an ultraviolet detector, a signal preprocessing circuit, a demodulation module and an information sink module: the working process of the device is just opposite to that of an emission system, an ultraviolet detector captures and collects ultraviolet signals, photoelectric conversion is carried out on the ultraviolet signals, a signal preprocessing module amplifies and filters electric signals and the like, and a demodulation module recovers original information and sends the information to an information sink module.
(3) Communication system
The ultraviolet light communication system has two communication modes: line of Sight (Sight) and non-Line of Sight (non-Sight) communications. As with conventional free-space optical communications, ultraviolet light communications can communicate in a line-of-sight manner, following the law of "signal intensity decays exponentially, inversely proportional to the square of the distance". In view of the characteristics of the ultraviolet light, a non-line-of-sight communication mode can be adopted, and the following description focuses on the non-line-of-sight communication mode specific to the ultraviolet light.
Due to the scattering effect of atmospheric molecules and suspended particles, the electromagnetic field generated by the ultraviolet light in the transmission process enables the electric charges carried by the particles in the atmosphere to generate oscillation, and the oscillation electric charges generate one or more electric dipoles to radiate secondary spherical waves. Since the oscillation of the charge is synchronized with the original wave, the secondary wave has the same electromagnetic oscillation frequency as the original wave and has a fixed phase relationship with the original wave, and the wave surface distribution and vibration of the secondary spherical wave determine the scattering direction of the scattered light. Thus, scattering the uv light signal in the atmosphere retains the same information as the light source.
The existing ultraviolet light source arrangement mode is point light source arrangement, and at least the problems exist in the arrangement: the ultraviolet light source has large work heating value, and the arrangement of the ultraviolet light source cannot be too dense due to the heat dissipation consideration, and enough space is reserved between the ultraviolet light source and the ultraviolet light source, so that the transmitter has large volume, is not beneficial to transfer and is limited in use; meanwhile, the arrangement of the ultraviolet light sources adjacent to each other is not beneficial to the scattering of the ultraviolet light sources, the loss of optical signals is large, and the transmission and the receiving of the optical signals are not beneficial.
Therefore, a portable ultraviolet light communication device is needed to solve the above problems.
Utility model
In order to solve the above problems, namely to solve the problems: the volume is large and the transfer is inconvenient; due to the arrangement mode of the point light sources, the scattering of the ultraviolet light sources is not facilitated, the loss of optical signals is large, and the transmission and the receiving of the optical signals are not facilitated. The embodiment of the utility model provides a lightweight ultraviolet ray communication device, including transmitter and receiver, wherein:
the transmitter comprises a modulator, a driving circuit and an ultraviolet light source which are sequentially connected in a circuit manner, and further comprises a first bottom plate, a transmitting circuit board, a transmitting shell, a first battery and a cooling fan, wherein the modulator, the driving circuit, the first battery and the cooling fan are all positioned on the transmitting circuit board, the transmitting circuit board is fixed in the transmitting shell, a first opening is formed at the bottom of the transmitting shell, the first bottom plate is connected with the transmitting shell through a connecting piece after being plugged with the first opening, a cooling through hole corresponding to an air outlet of the cooling fan is formed in the first bottom plate, and the ultraviolet light source is uniformly fixed on the outer side surface of the transmitting shell;
the emission shell comprises a first light source plane at the top and a plurality of second light source planes uniformly arranged on the periphery of the first light source plane, and the number of the ultraviolet light sources on the first light source plane and the second light source plane is multiple and uniformly arranged;
the receiver comprises an optical detector, a signal preprocessing circuit and a demodulator which are sequentially connected through circuits.
Further, the receiver further comprises a second bottom plate, a receiving circuit board, a protective glass, a light-gathering fresnel lens, a receiving shell and a light-gathering ring, wherein:
a second opening is formed at the bottom of the receiving shell, and the second bottom plate is detachably arranged in the second opening through a connecting piece;
the optical detector, the signal preprocessing circuit and the demodulator are positioned on the receiving circuit board, and the receiving circuit board is fixed in the receiving shell;
the protective glass, the light-gathering Fresnel lens, the light-gathering ring and the optical detector are arranged in sequence from the bottom to the top and are all positioned in the receiving shell.
Furthermore, the receiver further comprises a second battery, the second battery is fixed in the receiving shell, and the second battery supplies power to the optical detector, the signal preprocessing circuit and the demodulator.
Further, the transmitting circuit board is vertically arranged.
Further, the receiving circuit board is horizontally arranged.
Further, the emission shell is in a conical shape with a large bottom and a small upper part.
The utility model has the advantages that:
the heat emitted by the transmitter during working can be discharged from the heat dissipation through hole through the heat dissipation fan, so that a plurality of ultraviolet light sources can be installed in a small space, namely, the phenomenon that the temperature in the transmitting shell is too high due to the fact that the ultraviolet light sources are distributed too densely is avoided, the normal working of the transmitter is ensured, the overall size of the transmitter is greatly reduced, and the portability of the transmitter is ensured;
ultraviolet light sources are arranged on the first light source plane at the top of the transmitting shell and the second light source planes on the peripheral sides of the transmitting shell, so that scattering of ultraviolet light is facilitated, the ultraviolet light sources are prevented from being shielded from each other to influence the scattering of the ultraviolet light, propagation loss of the ultraviolet light is reduced, and transmission and receiving of optical signals are facilitated.
Drawings
FIG. 1 is a prior art control block diagram of an ultraviolet light communication device;
FIG. 2 is a control block diagram of one embodiment of a portable UV communication device;
FIG. 3 is a schematic perspective view of an embodiment of a transmitter;
FIG. 4 is a perspective view of the second view of FIG. 3;
FIG. 5 isbase:Sub>A cross-sectional view of section A-A of FIG. 4;
FIG. 6 is a schematic perspective view of a first view angle of an embodiment of a receiver;
FIG. 7 is a perspective view of the second view of FIG. 6;
FIG. 8 isbase:Sub>A cross-sectional view of section A-A of FIG. 7;
FIG. 9 is a deep ultraviolet LED spectrum;
fig. 10 (a) is direct-view communication;
fig. 10 (b) is a non-direct-view communication;
FIG. 11 is a schematic diagram of a scattercommunications system;
FIG. 12 is a receiving end flow diagram;
FIG. 13 is a waveform schematic after signal demodulation;
FIG. 14 is a schematic diagram of a CRC decoding module;
FIG. 15 is a schematic diagram of a decoding module simulation;
fig. 16 is a schematic diagram of a waveform after signal decoding.
In the figure:
1. a transmitter; 11. a modulator; 12. a drive circuit; 13. an ultraviolet light source; 14. a first base plate; 141. a heat dissipating through hole; 15. a transmitting circuit board; 16. an emission housing; 161. a first light source plane; 162. a second light source plane; 17. a first battery; 18. a heat radiation fan;
2. a receiver; 21. a photodetector; 22. a signal preprocessing circuit; 23. a demodulator; 24. a second base plate; 25. receiving a circuit board; 26. protective glass; 27. a light-condensing Fresnel lens; 28. a receiving housing; 29. a light gathering ring; 210. a second battery; 211. an aviation plug.
Detailed description of the preferred embodiments
Preferred embodiments of the present invention will be described below with reference to the accompanying drawings. It should be understood by those skilled in the art that these embodiments are only for explaining the technical principle of the present invention, and are not intended to limit the scope of the present invention.
Fig. 1 is a prior art, which has been described in detail in the background, and the description is not repeated.
Referring to fig. 2 to 10 (a), 10 (b), and 11 to 16, an embodiment of the present invention discloses a portable ultraviolet light communication device, which includes a transmitter 1 and a receiver 2, wherein:
the transmitter comprises a modulator 11, a driving circuit 12 and an ultraviolet light source 13 which are sequentially connected in a circuit manner, and further comprises a first bottom plate 14, a transmitting circuit board 15, a transmitting shell 16, a first battery 17 and a cooling fan 18, wherein the modulator, the driving circuit, the first battery and the cooling fan are all positioned on the transmitting circuit board, the transmitting circuit board is fixed in the transmitting shell, a first opening is formed at the bottom of the transmitting shell, the first bottom plate is connected with the transmitting shell through a connecting piece after being plugged with the first opening, a cooling through hole 141 corresponding to an air outlet of the cooling fan is formed in the first bottom plate, and the ultraviolet light source is uniformly fixed on the outer side surface of the transmitting shell;
the emission shell comprises a first light source plane at the top and a plurality of second light source planes 162 uniformly arranged on the periphery of the first light source plane 161, the number of the ultraviolet light sources on the first light source plane and the second light source plane is multiple and uniformly arranged, and for simplicity of drawing, only one ultraviolet light source is drawn at the center position of the first light source plane;
the receiver comprises a light detector 21, a signal preprocessing circuit 22 and a demodulator 23 which are sequentially connected by circuits.
The heat emitted by the transmitter during working can be discharged from the heat dissipation through hole through the heat dissipation fan, so that a plurality of ultraviolet light sources can be installed in a small space, namely, the phenomenon that the temperature in the transmitting shell is too high due to the fact that the ultraviolet light sources are distributed too densely is avoided, the normal working of the transmitter is guaranteed, the overall size of the transmitter is greatly reduced, and the portability of the transmitter is guaranteed; ultraviolet light sources are arranged on the first light source plane at the top of the transmitting shell and the second light source planes on the peripheral sides of the transmitting shell, so that scattering of ultraviolet light is facilitated, the ultraviolet light sources are prevented from being shielded from each other to influence the scattering of the ultraviolet light, propagation loss of the ultraviolet light is reduced, and transmission and receiving of optical signals are facilitated.
In addition, the receiver further includes a second base plate 24, a receiving circuit board 25, a protective glass 26, a condensing fresnel lens 27, a receiving casing 28, and a condensing ring 29, wherein: the bottom of the receiving surgery part forms a second opening, and the second bottom plate is detachably arranged in the second opening through a connecting piece; the optical detector, the signal preprocessing circuit and the demodulator are positioned on the receiving circuit board, and the receiving circuit board is fixed in the receiving shell; the protective glass, the light-gathering Fresnel lens, the light-gathering ring and the optical detector are arranged in sequence from the bottom to the top and are all positioned in the receiving shell.
Furthermore, the receiver further comprises a second battery 210, the second battery is fixed in the receiving shell, and the second battery supplies power to the optical detector, the signal preprocessing circuit and the demodulator. In addition, the power supply end of the receiving circuit board is also connected with an aviation plug 211.
The inventor finds that even if the emission shell is made into a frustum shape, a large amount of heat can still be generated when the emission circuit works, and the emission circuit board is vertically arranged for facilitating the arrangement of the heat radiation fan (enabling an air outlet of the heat radiation fan to be conveniently butted with the heat radiation through hole). Therefore, the heat dissipation is more efficient, namely, the distance between the ultraviolet light sources can be further reduced, the size of the ultraviolet light sources is reduced, and the portability of the ultraviolet light sources is improved.
In addition, the receiving circuit board is horizontally arranged. The butt joint with the ultraviolet light from top to bottom is convenient.
The structure of the ultraviolet light communication system mainly comprises two modules, namely a transmitter module and a receiver module, as shown in fig. 4.1, and different power supplies are respectively adopted by high-voltage circuits and low-voltage circuits in the system to reduce mutual interference.
The working principle of the system is as follows: and baseband digital signals generated by the communication board card are loaded to the ultraviolet light source power supply drive after being modulated by the modulator (FPGA channel coding and modulation), and the generated level signals are transmitted to the wireless channel through the ultraviolet transmitting light source. When the ultraviolet light signal is transmitted in the atmosphere, the ultraviolet light signal is subjected to the scattering and absorption action of atmospheric components, and the ultraviolet light signal after scattering and absorption is received by a photoelectric detector arranged at a receiving end and then is transmitted to a signal preprocessing circuit. The signal preprocessing circuit converts, filters and amplifies the signals, then demodulates and decodes the signals through the circuit board of the FPGA, and finally the original signals are restored by the communication board card.
1. Ultraviolet emitting light source
The ultraviolet light source (solar blind band 200nm-280 nm) is the most critical factor for determining the speed of the ultraviolet light communication system. The low-speed ultraviolet light communication system mostly adopts an arc lamp, a gas discharge lamp and an ultraviolet emission light source as light sources, and because of the light emitting characteristic of the light sources, the communication speed of the system is generally not more than 10Kbit/s, so that the application of the ultraviolet light communication system is restricted, and the finding of a new ultraviolet light source is very important.
UV LED ultraviolet LED
A Light Emitting Diode (LED) is a semiconductor light emitting device that converts electric energy into light energy, and is an electroluminescent solid light source. The appearance of deep ultraviolet LEDs overcomes the disadvantages of conventional light sources:
1) The LED is powered by low voltage, the driving voltage of a single tube is 1.5-3.5V, and the operability and the safety are guaranteed;
2) The LED has low power consumption, and the consumed energy is reduced by 80 percent compared with an incandescent lamp with the same lighting effect;
3) The LED has good stability, and the light output attenuation is 50% of the initial value when the LED works for 10 ten thousand hours;
4) The LED has short response time, only nanosecond level, overcomes the transition zone problem caused by a low-pressure mercury vapor lamp, and has theoretical bandwidth reaching Gbit/s.
The deep ultraviolet LED usually adopts AlGaN semiconductors, particularly AlGaN with high Al component, the melting point of the material is as high as 2500 ℃ under one atmospheric pressure, however, the improvement of the Al component is always a difficulty in the development of the deep ultraviolet LED. At present, alGaN with high Al component is mostly grown by adopting low-temperature and low-pressure epitaxial technology, and has the defects of poor crystal quality and easy formation of polycrystal. In the epitaxial growth process, compared with Ga atoms, al atoms have large viscosity coefficient and small mobility, and are difficult to migrate to the lattice site with the lowest energy to form a high-quality crystal with uniform C-axis orientation. Compared with a GaN bond, the AlN bond has stronger polarity, the difference of domain characteristics, grain structures, crystal quality and the like of different polarity surfaces is large, if the position of Al atomic crystal lattice is not well controlled, defects are easy to form, and in addition, a sapphire substrate is usually adopted, the matching with epitaxial crystal lattice is improper, the difference of expansion coefficients is more obvious, three-dimensional epitaxial growth is caused, complex changes such as relative inclination and distortion among grains are brought, and the release of stress in the epitaxial layer is of great importance. Therefore, to make breakthrough progress in the application of deep ultraviolet LEDs, the key technical problem of LED epitaxy needs to be solved first.
The project group has abundant experience in the high Al component AlGaN epitaxial technology, and aims to develop a required deep ultraviolet LED product according to the requirement of an ultraviolet light communication system, and the deep ultraviolet LED product is used as a first choice of an ultraviolet light source to obtain excellent performance.
The deep ultraviolet LED characteristic parameters are shown in fig. 9.
UV ultraviolet laser light source
Solid ultraviolet laser
The solid ultraviolet laser is divided into xenon lamp pumping ultraviolet laser, krypton lamp pumping ultraviolet laser and novel laser diode pumping all-solid-state laser according to pumping mode. The photoelectric conversion efficiency of the solid ultraviolet laser is generally low, and the LD all-solid ultraviolet laser has the characteristics of high efficiency, high repetition frequency, reliable performance, small volume, good beam quality, stable power and the like.
Semiconductor laser diode
Since the middle of the 20 th century and the 80 s, the development of semiconductor manufacturing technology and the combination with laser technology have promoted semiconductor laser diodes, such laser sources with both semiconductor and laser characteristics have higher peak power and lower energy consumption, and the emission pulse width is narrower, and the temperature and optical compensation are not required, so that the semiconductor laser diode has obvious advantages compared with the traditional emission light source, and becomes the key direction of the development of medium ultraviolet band AlGaN. Because the excitation efficiency of the ultraviolet radiation in the wave band is highest, the output efficiency is higher.
2. Photoelectric detector
The ultraviolet photoelectric detector is a core device of the receiver, and the main function is to complete conversion from an ultraviolet signal to an electric signal. For non-line-of-sight ultraviolet communication, an ideal photodetector should have a large detection area, high gain and bandwidth, high signal light transmittance, and extremely low dark current. Currently, ultraviolet detectors typically employ photomultiplier tubes, photodiodes, and avalanche photodiodes.
The project develops a solar blind ultraviolet photodiode with excellent performance for ultraviolet detection based on the research and development technical experience of a deep ultraviolet detector made of high Al component AlGaN semiconductor material in a technical team so as to obtain high response speed, better anti-interference capability and longer service life.
And simultaneously testing the use characteristics of the ultraviolet photoelectric tube and the ultraviolet multiplier tube.
3. Ultraviolet light communication transmission model
The atmospheric molecules and many particles in the atmosphere have strong scattering effect on the ultraviolet light signal, and the scattered ultraviolet light signal can maintain the frequency and fixed phase relation of the initial light signal, so that the scattered ultraviolet light signal can be used for transmitting information. The link modes of the ultraviolet light communication include direct-view communication and non-direct-view communication, as shown in fig. 10 (a) and 10 (b).
Early ultraviolet communication systems were mostly direct-view communication, and with the progress of modern optoelectronic technologies, non-direct-view ultraviolet communication technologies have also made great progress. The solar blind ultraviolet light communication system is established on the basis of the low background of solar blind ultraviolet light on the earth surface, and the low background of ultraviolet light is the result of strong absorption of ultraviolet light by ozone in the atmosphere. For both general infrared light communications and general laser light communications, strict alignment between the transmitter and receiver is required. The ability to achieve non-line-of-sight communication with solar-blind uv light communication has therefore attracted considerable interest. In 2000, the general company developed a new set of non-direct-view ultraviolet communication system for the U.S. military, and the system has a stable transmission channel, and the non-direct-view communication distance can reach 1-3 km. The system has the advantages of low transmitting power, good concealment, strong maneuverability and capability of realizing non-direct-view communication. The solar blind ultraviolet communication is realized by utilizing the solar blind characteristic of solar blind ultraviolet light in a low-altitude atmospheric channel and the scattering effect of the solar blind ultraviolet light in the atmosphere, and has the remarkable characteristic that the solar blind ultraviolet communication has a non-line-of-sight transmission function, so that the solar blind ultraviolet communication has great superiority and development potential in the field of military communication.
The utility model discloses plan to adopt non-sight communication mode, its theory of operation is: the electromagnetic field generated by light transmitted in atmosphere can make the charges carried by molecules and particles in atmosphere produce oscillation, and the oscillated charges can produce one or several electric dipoles, and these electric dipoles can radiate secondary spherical wave to periphery, so that the secondary spherical wave and original wave have identical oscillation frequency and fixed phase relationship. The distribution and vibration of the wavefront of the secondary spherical wave will determine the scattering direction of the light, so the emitted uv signal can be scattered in the atmosphere, and most importantly, the scattered signals can retain the original information, so as long as they reach the field of view of the receiver, communication can be achieved.
The project firstly researches an atmospheric channel model of solar blind ultraviolet light communication in a simple environment, utilizes the model to carry out numerical calculation on non-line-of-sight transmission of solar blind ultraviolet light in the atmosphere, analyzes the contribution of scattering of atmospheric molecules and aerosol particles to a solar blind ultraviolet light communication system, and further discusses the physical mechanism for realizing a scattering communication technology to obtain an ultraviolet light communication system scattering atmosphere transmission model meeting the system requirements by the influence of various geometric parameters of a transmitter and a receiver on received optical signals.
Fig. 11 is a schematic diagram of a scattercommunications system. The light source at the emitting end has a beam divergence angle of 2 theta T Transmitting optical signals into the air, and the receiving angle of the receiver is 2 theta R Elevation angle of transmitter and receiver is beta T And beta R The emitted beam and the received field of view form a scatterer connected to the communication link in the spatial intersection region, which can be visually regarded as a small "repeater station". The optical signal transmitted by the transmitter reaches the 'relay station' after being transmitted through the atmosphere, and the receiver collects the scattering of the optical signal from the 'relay station', so that the non-line-of-sight transmission of the communication signal is completed. Since the received scattered light is usually weak, the volume of the effective scatterer in the air can be equivalently increased by increasing the receiving field of view, so that more scattered light signals can be received.
4. Coding and modulation design for transmitters
For an ultraviolet communication system, signals need to be modulated to realize communication. The modulation acts on the transmitting end of the system, which processes the signal to make it suitable for channel transmission. The baseband signal often cannot be directly used as a transmission signal, and is converted first. The new signal frequency needs to be much higher than the baseband frequency for smooth transmission.
In an ultraviolet light communication system, signal transmission needs to be realized by an ultraviolet light device, and information transmission is completed through signal modulation. The modulation process includes changing the amplitude, frequency, and phase of the ultraviolet light. Modulation schemes are classified into Amplitude Modulation (AM), frequency Modulation (FM), and Phase Modulation (PM) according to Modulation targets.
The final signal modulation mode is determined based on the test result.
5. Demodulation and decoding design for receiver
The flow of the receiving end module of the ultraviolet light communication system is expressed as fig. 12, and it can be seen from the flow chart that the modulation and demodulation at the receiving end can be regarded as the inverse process of the modulation and coding at the transmitting end to some extent, but is more difficult to implement. The data read by the receiving end is the signal which is received by the photoelectric detector through the atmospheric channel, amplified, filtered and shaped. The FPGA stores the processed signals into a buffer by using a high-frequency clock, after FSK demodulation and parallel-serial-parallel connection are carried out on the data, a CRC (cyclic redundancy check) module starts to decode the data, and if errors exist, a program automatically carries out error correction work to a certain degree.
(1) Modulation module
And the modulation module is used for carrying out signal modulation on the transmitted optical signal. In order to ensure that the optical pulse signal is stable, the idle state continuously outputs high frequency. In the modulation process, compensation bits are added in front of data, and transmitted data is followed.
(2) Demodulation module and decoding module
The receiving end demodulates the data and then enters a decoding function module. Fig. 13-16 are block diagrams of decoding schemes designed herein.
It should be noted that in the description of the present invention, the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. indicating the directions or positional relationships are based on the directions or positional relationships shown in the drawings, which are only for convenience of description, and do not indicate or imply that the device or element must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
Furthermore, it should be noted that, in the description of the present invention, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
The terms "comprises," "comprising," or any other similar term are intended to cover a non-exclusive inclusion, such that a process, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, article, or apparatus.
Claims (6)
1. A lightweight ultraviolet light communication device comprising a transmitter and a receiver, wherein:
the transmitter comprises a modulator, a driving circuit and an ultraviolet light source which are sequentially connected in a circuit manner, and further comprises a first bottom plate, a transmitting circuit board, a transmitting shell, a first battery and a cooling fan, wherein the modulator, the driving circuit, the first battery and the cooling fan are all positioned on the transmitting circuit board, the transmitting circuit board is fixed in the transmitting shell, a first opening is formed at the bottom of the transmitting shell, the first bottom plate is connected with the transmitting shell through a connecting piece after being plugged with the first opening, a cooling through hole corresponding to an air outlet of the cooling fan is formed in the first bottom plate, and the ultraviolet light source is uniformly fixed on the outer side surface of the transmitting shell;
the emission shell comprises a first light source plane at the top and a plurality of second light source planes uniformly arranged on the periphery of the first light source plane, and the number of the ultraviolet light sources on the first light source plane and the second light source plane is multiple and uniformly arranged;
the receiver comprises an optical detector, a signal preprocessing circuit and a demodulator which are sequentially connected through circuits.
2. The portable ultraviolet light communication device as recited in claim 1, wherein the receiver further comprises a second base plate, a receiving circuit board, a cover glass, a concentrating fresnel lens, a receiving housing, and a concentrating ring, wherein:
a second opening is formed at the bottom of the receiving shell, and the second bottom plate is detachably arranged in the second opening through a connecting piece;
the optical detector, the signal preprocessing circuit and the demodulator are positioned on the receiving circuit board, and the receiving circuit board is fixed in the receiving shell;
the protective glass, the light-gathering Fresnel lens, the light-gathering ring and the optical detector are arranged in sequence from the bottom to the top and are all positioned in the receiving shell.
3. The portable ultraviolet light communication device in accordance with claim 2, wherein the receiver further comprises a second battery, the second battery being secured within the receiver housing, the second battery powering the light detector, the signal preprocessing circuit, and the demodulator.
4. The portable ultraviolet light communication device in accordance with claim 3, wherein the transmitting circuit board is vertically disposed.
5. The portable ultraviolet light communication device in accordance with claim 4, wherein the receiving circuit board is horizontally disposed.
6. The portable ultraviolet light communication device in accordance with claim 5, wherein the emission housing is tapered with a large bottom and a small top.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222670292.2U CN218772094U (en) | 2022-10-08 | 2022-10-08 | Portable ultraviolet light communication device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222670292.2U CN218772094U (en) | 2022-10-08 | 2022-10-08 | Portable ultraviolet light communication device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN218772094U true CN218772094U (en) | 2023-03-28 |
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|---|---|---|---|
| CN202222670292.2U Expired - Fee Related CN218772094U (en) | 2022-10-08 | 2022-10-08 | Portable ultraviolet light communication device |
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| Country | Link |
|---|---|
| CN (1) | CN218772094U (en) |
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2022
- 2022-10-08 CN CN202222670292.2U patent/CN218772094U/en not_active Expired - Fee Related
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