Ultraviolet light communication transceiving integrated antenna and omnidirectional ultraviolet communication device

Abstract

The invention discloses an ultraviolet light communication transceiving integrated antenna and an omnidirectional ultraviolet communication device. Comprising an annular compound paraboloid optical receiving antenna and a multi-directional transmitting antenna, the multi-directional transmitting antenna is installed on the receiving antenna, the receiving antenna comprises an upper reflecting part, a lower reflecting part and a connecting support, the upper reflecting part and the lower reflecting part are connected through the connecting support, and the upper reflecting part and the lower reflecting part are arranged in a spaced mode. A through hole is formed in the center of the lower reflection part, and a solar blind deep cut-off ultraviolet light filter is fixedly installed at the through hole and used for filtering light rays outside the signal light wave band and passing through deep ultraviolet light of the signal light wave band. Receiving light of the receiving antenna is received by the ultraviolet detector of the receiver after passing through the solar blind deep cut-off ultraviolet optical filter, the receiving antenna is beneficial to enlarging the distance of a communication link, the signal-to-noise ratio of signals can be increased, and finally omnidirectional receiving on a non-direct-view link is achieved.

Description

Technical Field

[0001] The present invention relates to an ultraviolet light communication device in the technical field of optical wireless communication, and in particular to an ultraviolet light communication transceiver integrated antenna and an omnidirectional ultraviolet light communication device. Background Art

[0002] As an important field of optical wireless communication, ultraviolet light communication has the advantages of anti-electromagnetic interference and confidential communication. Due to the "sun-blind" characteristics of the deep ultraviolet band (200-280nm, UVC) in which it is located and the special scattering characteristics when transmitted in the near-ground atmosphere, it can achieve near-ground high signal-to-noise ratio and non-line-of-sight (NLOS) link communication. Non-line-of-sight link communication is very suitable for deployment in short-distance Ad-Hoc networks, such as between water vessels, between road convoys, and in aerial drone formations. According to relevant literature and experiments, ultraviolet light communication of NLOS links has a link loss of up to 100dB over short distances, and its use in mobile scenarios is limited. Many ultraviolet light communication-related works are designed by optical receiving antennas and multi-faceted array LED light sources to enhance the received signal strength, increase the receiving field of view and azimuth range, and reduce link loss to improve link performance.

[0003] Common receiving antenna structures for optical wireless communication mainly include: general lens antenna, Fresnel lens antenna and parabolic reflector antenna. The ultraviolet optical glass required for general lens antenna is expensive and complex to process. Fresnel lens antenna has high processing requirements and a small field of view, which is not suitable for use in mobile scenarios. Among the parabolic types, the compound parabolic concentrator (CPC) is a non-imaging optical concentrator with advantages such as large receiving field of view, high light collection rate and simple structure. It was first used in the design of solar receiving concentrators and radiant heat collectors. However, in actual use scenarios, especially in mobile scenarios, the integrated ultraviolet light communication transceiver antenna needs to have a larger field of view and omnidirectional communication in the azimuth range. A single LED as a light source and a single CPC as a receiving antenna are difficult to meet the performance requirements of the communication link. The annular compound parabolic concentrator (ACPC) is generally used in tower solar thermal power generation systems. It can collect light from different azimuths through a special annular structure. Compared with the general compound parabola structure, the annular compound parabola structure has a wider receiving field of view and azimuth angle range.

[0004] As a means of localized communication within a short distance, ultraviolet light communication is very suitable for use in mobile Ad Hoc networks. Each communication node in an Ad Hoc network needs to have the ability to send and receive signals at the same time. Therefore, ultraviolet light communication terminals used in mobile Ad Hoc networks need to have a large field of view, omnidirectional receiving optical antenna, and a transmitting antenna that can send signals in multiple directions. Summary of the invention

[0005] In view of the shortcomings existing in the current technology, and to meet the needs of omnidirectional ultraviolet light communication with a large receiving field of view in a non-line-of-sight link in a mobile scenario, the present invention provides a large-field-of-view, omnidirectional and high-gain transceiver integrated optical antenna and an omnidirectional ultraviolet light communication device based on an annular compound parabolic concentrator (ACPC). The present invention applies the annular compound parabolic structure to the field of optical wireless communication for the first time, and adds a multi-directional transmitting array to complete the design of the transceiver integrated antenna. On the basis of the ultraviolet light communication transceiver integrated antenna, the present invention also proposes a device that allows ultraviolet light communication to complete omnidirectional information transmission on a non-line-of-sight link. On the one hand, the optical receiving antenna can receive ultraviolet light from the atmosphere in all directions, which increases the antenna's receiving field of view and enhances the non-line-of-sight link performance; based on the double reflecting surface design with rotational symmetry of the central axis, omnidirectional reception at the receiving end is achieved. On the other hand, the multi-directional transmitting antenna can expand the coverage characteristics of the link.

[0006] In order to solve the above technical problems, the technical solution of the present invention is as follows:

[0007] 1. An integrated ultraviolet light communication antenna

[0008] The ultraviolet light communication transceiver integrated antenna comprises an annular compound parabolic optical receiving antenna and a multi-directional transmitting antenna, wherein the multi-directional transmitting antenna is mounted on the annular compound parabolic optical receiving antenna, wherein the annular compound parabolic optical receiving antenna comprises an upper reflecting part, a lower reflecting part and a connecting bracket, wherein the upper reflecting part and the lower reflecting part are connected by the connecting bracket and the upper reflecting part and the lower reflecting part are arranged at intervals, a through hole is opened at the center of the lower reflecting part and a "sun-blind" deep cut-off ultraviolet filter is fixedly mounted at the through hole, which is used for filtering out non-deep ultraviolet light in the signal light band and passing the deep ultraviolet light in the signal light band.

[0009] In the annular compound parabolic optical receiving antenna, the lower surface of the upper reflecting part and the upper surface of the lower reflecting part are both parabolas formed after a parabola rotates around the n-axis for one circle, each parabola is plated with an aluminum film, the opening of the parabola corresponding to the upper reflecting part is downward, and the opening of the parabola corresponding to the lower reflecting part is upward, and the two parabolas are symmetrical about the m-axis, and the angle between the m-axis and the n-axis is an acute angle, so that an ultraviolet band signal receiving cavity with an opening upward is formed between the upper reflecting part and the lower reflecting part.

[0010] The multi-directional transmitting antenna comprises a polygonal pyramid structure and an LED array; the polygonal pyramid structure is fixedly mounted on the top surface of the annular compound parabolic optical receiving antenna, and the LED array is fixedly mounted on the side surface of the polygonal pyramid structure.

[0011] In the multi-sided pyramid structure, two or more side surfaces are installed with LED arrays.

[0012] The integrated transceiver optical antenna is in a movable state.

[0013] The design method of the annular compound parabola optical receiving antenna comprises the following steps:

[0014] 1) Determine the angle φ between the m-axis and the n-axis according to the main receiving field angle of the annular compound parabola optical receiving antenna;

[0015] 2) According to the radius of the "solar blind" deep cut-off ultraviolet filter d2, determine the exit aperture BC of the ultraviolet band signal receiving cavity, and then determine the equation of the parabola AB, the formula is as follows:

[0016]

[0017] Where y(x) is the ordinate value when the abscissa is x, and θ0 is the receiving half field of view angle;

[0018] 3) After the parabola AB is symmetrical about the m-axis, the parabola DC is obtained, and then the parabola AB and the parabola DC are rotated around the n-axis once to form the upper surface of the lower reflecting part and the lower surface of the upper reflecting part respectively.

[0019] In the above 1), the main receiving field of view angle is complementary to the angle φ between the m-axis and the n-axis.

[0020] 2. An omnidirectional ultraviolet communication device

[0021] The omnidirectional ultraviolet communication device includes the ultraviolet light communication transceiver integrated antenna and an ultraviolet detector installed in the lower reflection part of the ultraviolet light communication transceiver integrated antenna, wherein each ultraviolet light communication transceiver integrated optical antenna serves as a transmitting antenna or a receiving antenna.

[0022] The technical effects of the present invention are:

[0023] The transceiver integrated ultraviolet optical communication antenna of the present invention adopts a ring-shaped compound parabola structure to increase the receiving field of view of the antenna, and adopts a multi-prism multi-faceted LED array to expand the coverage of the signal light, thereby realizing omnidirectional signal transceiver in the azimuth range. In non-line-of-sight link communication, each node only needs to deploy a single ultraviolet communication transceiver integrated antenna, and does not need a servo alignment system, so that the transmission and reception of omnidirectional signal light in different fields of view can be realized. The aluminum film electroplated on the reflective surface of the receiving antenna has a very high reflectivity to deep ultraviolet light, which can enhance the light collection rate of the signal light. The LED array on the side of the transmitting antenna can spread the signal light around as much as possible. Finally, the received light of the receiving antenna passes through the "day-blind" deep cutoff ultraviolet filter and is received by the ultraviolet detector of the receiver. The receiving antenna helps to expand the distance of the communication link, and can also increase the signal-to-noise ratio of the signal, and finally realizes omnidirectional reception on the non-line-of-sight link. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a schematic diagram of a non-line-of-sight link for omnidirectional ultraviolet light communication.

[0025] Figure 2 It is a structural principle diagram of the annular compound parabolic optical receiving antenna in the ultraviolet light communication integrated transceiver antenna.

[0026] Figure 3 It is a light schematic diagram obtained after ray tracing simulation of the annular compound parabolic optical receiving antenna in the ultraviolet light communication integrated transceiver antenna in the TracePro software.

[0027] Figure 4 This is the structural modeling diagram of the ultraviolet light communication integrated transceiver antenna.

[0028] Figure 5 This is a diagram of the luminous flux received on the "solar-blind" UV filter under the Lambertian light source setting with a 0° field of view for the UV communication integrated transceiver antenna in TracePro software simulation.

[0029] Figure 6 This is a diagram of the luminous flux received on the "solar-blind" UV filter under the Lambertian light source setting with a 10° field of view for the UV communication integrated transceiver antenna in TracePro software simulation.

[0030] Figure 7 This is a diagram of the luminous flux received on the "solar-blind" UV filter under the Lambertian light source setting with a 20° field of view for the UV communication integrated transceiver antenna in TracePro software simulation.

[0031] Figure 8This is a diagram of the luminous flux received on the "solar-blind" UV filter under the Lambertian light source setting with a 30° field of view for the UV communication integrated transceiver antenna in TracePro software simulation.

[0032] Fig. 9 This is a diagram of the luminous flux received on the "solar-blind" UV filter under the Lambertian light source setting with a 40° field of view for the UV communication integrated transceiver antenna in TracePro software simulation.

[0033] Fig.10 This is a diagram of the luminous flux received on the "solar-blind" UV filter under the Lambertian light source setting with a 50° field of view for the UV communication integrated transceiver antenna in TracePro software simulation.

[0034] Fig.11 This is a diagram of the luminous flux received on the "solar-blind" UV filter under the Lambertian light source setting with a 60° field of view for the UV communication integrated transceiver antenna in TracePro software simulation.

[0035] Fig.12 This is a diagram of the luminous flux received on the "solar-blind" UV filter under the Lambertian light source setting with a 70° field of view for the UV communication integrated transceiver antenna in TracePro software simulation.

[0036] Fig.13 It is a line graph of the changes in the size of the luminous flux received on the "solar-blind" UV filter under the Lambertian light source setting in each field of view of the UV communication integrated transceiver antenna in the TracePro software simulation.

[0037] Fig.14 It is the signal reception waveform diagram of the ultraviolet communication terminal before and after the omnidirectional optical receiving antenna is installed, with the signal source and receiver placed at the same height at different distances in the non-line-of-sight link.

[0038] In the figure: an upper reflecting part 1, a lower reflecting part 2, a "sun-blind" deep cut-off ultraviolet filter 3, a multi-prism structure 4, an LED array 5, and a connecting bracket 6. Specific implementation plan

[0039] The receiving principle and design method of the ultraviolet light communication integrated transceiver antenna proposed by the present invention are further elaborated below in conjunction with the accompanying drawings.

[0040] like Figure 4As shown, an ultraviolet light communication transceiver integrated antenna proposed by the present invention includes an annular compound parabolic optical receiving antenna and a multi-directional transmitting antenna, wherein the multi-directional transmitting antenna is fixedly mounted on the annular compound parabolic optical receiving antenna, wherein the annular compound parabolic optical receiving antenna includes an upper reflector 1, a lower reflector 2 and a connecting bracket 6, wherein the upper reflector and the lower reflector are connected by a connecting bracket and are arranged at intervals, a through hole is provided at the center of the lower reflector and a "sun-blind" deep cut-off ultraviolet filter 3 is fixedly mounted at the through hole, which is used to filter out non-deep ultraviolet light in the signal light band and pass through the deep ultraviolet light in the signal light band, and finally reach the ultraviolet detector behind the "sun-blind" deep cut-off ultraviolet filter 3. The annular compound parabolic optical receiving antenna can receive ultraviolet light from the atmosphere in all directions, thereby increasing the receiving field of view of the antenna and enhancing the non-direct line-of-sight link performance. Based on the double reflecting surface design with rotational symmetry of the central axis, omnidirectional reception at the receiving end is realized.

[0041] like Figure 2 and Figure 3 As shown, in the annular composite parabolic optical receiving antenna, the lower surface of the upper reflector and the upper surface of the lower reflector are both parabolas formed after a parabola rotates around the n-axis, that is, the n-axis is the rotation axis. That is, the rotation axes of the upper reflector and the lower reflector are both the n-axis, the opening of the parabola corresponding to the upper reflector is downward, and the opening of the parabola corresponding to the lower reflector is upward, and the two parabolas are symmetrical about the m-axis, that is, the m-axis is the symmetry axis, and the angle between the m-axis and the n-axis is an acute angle, so that an ultraviolet band signal receiving cavity with an opening upward is formed between the upper reflector and the lower reflector, that is, a focusing trough for receiving external light. Each parabola is coated with an aluminum film with high reflectivity to ultraviolet light. The aluminum film has a reflectivity of nearly 99% to ultraviolet light.

[0042] The multi-directional transmitting antenna includes a polygonal pyramid structure 4 and an LED array 5; the polygonal pyramid structure 4 is fixedly mounted on the top surface of the upper reflector 1 of the annular compound parabolic optical receiving antenna, and the LED array 5 is fixedly mounted on each side of the polygonal pyramid structure 4. The number and arrangement of LEDs on the LED array 5 can be specifically designed.

[0043] like Figure 2 As shown, the design method of the annular compound parabola optical receiving antenna includes the following steps:

[0044] 1) The angle φ between the m-axis and the n-axis is determined according to the main receiving field angle of the annular compound parabola optical receiving antenna; the main receiving field angle and the angle φ between the m-axis and the n-axis are complementary to each other.

[0045] 2) According to the radius d2 of the "solar blind" deep cut-off ultraviolet filter 3, the exit aperture BC of the ultraviolet band signal receiving cavity is determined, and then the equation of the parabola AB is determined, and the formula is as follows:

[0046]

[0047] Where y(x) is the ordinate value when the abscissa is x, and θ0 is the receiving half field of view angle;

[0048] 3) After the parabola AB is symmetrical about the m-axis, the parabola DC is obtained, and then the parabola AB and the parabola DC are rotated around the n-axis for one circle to form the upper surface of the lower reflector and the lower surface of the upper reflector, respectively, so as to obtain the optical parameters of the annular compound parabolic optical receiving antenna, including focal length f, entrance aperture AD, length l, focusing ratio c, distance d4 from point A to the n-axis, distance d2 from point B to the n-axis, distance d1 from point C to the n-axis, distance d2 from point D to the n-axis and focusing ratio c0, wherein f = (BC / 2)(1+sinθ0),

[0049] Figure 2 In the figure, in each azimuth direction in the atmospheric channel, the ultraviolet light (solid line) and other spectral components (dashed line) in the receiving field of view enter from the surface formed by AD rotating around the n-axis, and are reflected by the top compound parabola 1 and the bottom compound parabola 2. There is also direct light that has not been emitted and is emitted from the surface formed by BC rotating around the n-axis. Finally, part of the light reaches the upper surface of the "solar blind" deep cutoff ultraviolet filter 3, as shown in FIG. Figure 3 shown.

[0050] When the ultraviolet light communication integrated transceiver antenna of the present invention is working, the external light from various directions and fields of view is focused by the top compound parabola 1 and the bottom compound parabola 2 electroplated with aluminum film, and part of the light reaches the "solar blind" deep cutoff ultraviolet filter 3, and is received by the subsequent ultraviolet detector after filtering.

[0051] In a specific embodiment, the relevant parameter values ​​of the ultraviolet light communication integrated transceiver antenna of the present invention are shown in Table 1:

[0052] Table 1 shows the relevant parameter values ​​of the integrated transceiver antenna for ultraviolet communication

[0053] φ <![CDATA[d2]]> <![CDATA[θ0]]> BC The number of sides of the pyramid structure 45° 15mm 30° 30mm 6

[0054] Figure 5-Figure 12 The examples of the integrated ultraviolet communication transceiver antenna are respectively the luminous flux diagrams received on the "sun-blind" ultraviolet filter under the light source settings of 0°, 10°, 20°, 30°, 40°, 50°, 60° and 70° field of view in the TracePro software simulation. It can be found that the optical communication antenna of the present invention can receive external light under the field of view of 0°-70°. Fig.13 By recording the luminous flux values ​​received in each field of view, it can be found that the luminous flux is the largest in the field of view angle direction range that is complementary to φ.

[0055] The present invention also proposes an omnidirectional ultraviolet communication device using an ultraviolet communication transceiver integrated antenna, the omnidirectional ultraviolet communication device comprising a plurality of ultraviolet communication transceiver integrated antennas and an ultraviolet detector installed in the lower reflection part of the ultraviolet communication transceiver integrated optical antenna. Figure 1 As shown, each integrated ultraviolet light communication transceiver optical antenna is used as a transmitting antenna or a receiving antenna, that is, the integrated ultraviolet light communication transceiver antenna generally adopts a time division multiplexing mode when applied, that is, the integrated transceiver antenna on a certain node can only be in a transmitting working state or a receiving working state at the same time. The integrated transceiver optical antenna is in a movable state.

[0056] Fig.14 The following are waveform diagrams of signals received at different distances in the experiment before and after the optical transceiver integrated antenna of the present invention is installed on the non-line-of-sight link of ultraviolet light communication. When the antenna is not installed, the non-line-of-sight link can only achieve a communication distance of about 5m. After adding the antenna, the system can receive a signal waveform with the same strength at a distance of 50m as at a distance of 5m without the antenna, and has consistent reception performance at all azimuths, and has the potential to further extend the communication distance.

[0057] The above descriptions are merely embodiments of the present invention and are not intended to limit the patent scope of the present invention. Any equivalent structural transformations made using the contents of the present invention's specification and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. An integrated ultraviolet light communication transceiver antenna, characterized in that: The invention comprises an annular compound parabola optical receiving antenna and a multi-directional transmitting antenna, wherein the multi-directional transmitting antenna is mounted on the annular compound parabola optical receiving antenna, wherein the annular compound parabola optical receiving antenna comprises an upper reflecting part (1), a lower reflecting part (2) and a connecting bracket (6), wherein the upper reflecting part and the lower reflecting part are connected by the connecting bracket and are arranged at intervals, wherein a through hole is provided at the center of the lower reflecting part and a "sun-blind" deep cut-off ultraviolet filter (3) is fixedly mounted at the through hole and is used for filtering out non-deep ultraviolet light in the signal light band and passing deep ultraviolet light in the signal light band.

2. The ultraviolet light communication transceiver integrated antenna according to claim 1, characterized in that: In the annular compound parabolic optical receiving antenna, the lower surface of the upper reflecting part and the upper surface of the lower reflecting part are both parabolas formed after a parabola rotates around the n-axis for one circle, each parabola is plated with an aluminum film, the opening of the parabola corresponding to the upper reflecting part is downward, and the opening of the parabola corresponding to the lower reflecting part is upward, and the two parabolas are symmetrical about the m-axis, and the angle between the m-axis and the n-axis is an acute angle, so that an ultraviolet band signal receiving cavity with an opening upward is formed between the upper reflecting part and the lower reflecting part.

3. The ultraviolet light communication transceiver integrated antenna according to claim 1, characterized in that: The multi-directional transmitting antenna comprises a polygonal pyramid structure (4) and an LED array (5); the polygonal pyramid structure (4) is fixedly mounted on the top surface of the annular compound parabolic optical receiving antenna, and the LED array (5) is fixedly mounted on the side surface of the polygonal pyramid structure (4).

4. The ultraviolet light communication transceiver integrated antenna according to claim 3, characterized in that: In the polygonal pyramid structure (4), two or more side surfaces are installed with LED arrays (5).

5. The ultraviolet light communication transceiver integrated antenna according to claim 1, characterized in that: The integrated transceiver optical antenna is in a movable state.

6. The ultraviolet light communication transceiver integrated antenna according to claim 2, characterized in that: The design method of the annular compound parabola optical receiving antenna comprises the following steps: 1) Determine the angle φ between the m-axis and the n-axis according to the main receiving field angle of the annular compound parabola optical receiving antenna; 2) According to the radius d2 of the "solar blind" deep cut-off ultraviolet filter (3), the exit aperture BC of the ultraviolet band signal receiving cavity is determined, and then the equation of the parabola AB is determined, and the formula is as follows: Where y(x) is the ordinate value when the abscissa is x, and θ0 is the receiving half field of view angle; 3) After the parabola AB is symmetrical about the m-axis, the parabola DC is obtained, and then the parabola AB and the parabola DC are rotated around the n-axis once to form the upper surface of the lower reflecting part and the lower surface of the upper reflecting part respectively.

7. The ultraviolet light communication transceiver integrated antenna according to claim 6, characterized in that: In the above 1), the main receiving field of view angle is complementary to the angle φ between the m-axis and the n-axis.

8. An omnidirectional ultraviolet communication device, characterized in that: It comprises the ultraviolet light communication transceiver integrated antenna as claimed in claim 1 and an ultraviolet detector installed in the lower reflection part of the ultraviolet light communication transceiver integrated antenna, wherein each ultraviolet light communication transceiver integrated optical antenna serves as a transmitting antenna or a receiving antenna.

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