Optical communication method and system based on vehicle lamp

Abstract

The invention belongs to the technical field of optical communication, and relates to an optical communication method and system based on a vehicle lamp, the optical communication method is applied to a processor of a vehicle, the vehicle further comprises a digital micromirror chip, and the method comprises the steps that the vehicle is controlled to emit a visible light detection signal to all vehicles in a target communication scene; receiving a response signal generated by the target communication vehicle based on the visible light detection signal; obtaining a view field included angle between the visible light detection signal and the response signal; based on the image focal length and the view field included angle of the receiving end lens of the vehicle, calculating the opening area image height of the digital micromirror chip to obtain the current opening area image height; and adjusting the opening area image height of the digital micromirror chip of the vehicle to be the current opening area image height so as to adjust the opening area of the digital micromirror chip, thereby enabling the vehicle to only emit a visible light communication signal to the target communication vehicle. By adopting the scheme, the independent communication between the vehicle and the target communication vehicle can be realized, and the safety in the communication process is ensured.

Description

Technical Field

[0001] The present invention relates to the field of optical communication technology, and in particular to an optical communication method and system based on vehicle lights. Background Art

[0002] With the development of the automotive industry and the continuous advancement of wireless communication technology, the Internet of Vehicles is of great significance to improving road safety, optimizing transportation efficiency, and building a new smart city transportation system. Traditional intelligent transportation networks mostly rely on wireless network connections. When the network is unstable, there will be large communication delays. In cities with dense communications, the communication quality will be disturbed by electromagnetic radiation. It cannot fully adapt to application scenarios such as mountainous areas and tunnels, and cannot guarantee the effectiveness of road condition information transmission.

[0003] Visible Light Communication (VLC) is an emerging communication technology that uses visible light with a wavelength of 380nm~780nm as a medium to transmit information by controlling the high-speed flashing of the light source. VLC has an unallocated spectrum bandwidth of 420THz~780THz, which can achieve very high data transmission rates. It has the advantages of high spectrum efficiency, high reliability, low latency, high data rate, strong anti-interference ability, and high security, which helps to solve the problem of insufficient bandwidth in traditional RF communications. Visible light communication based on car lights uses the high-speed brightness changes of visible light to realize data transmission in the Internet of Vehicles while lighting. It does not require spectrum authorization and has a huge bandwidth, avoiding interference and delay problems in traditional wireless communications, making data transmission more reliable and with lower latency.

[0004] However, in the current visible light communication system based on vehicle lights, when a vehicle sends out a visible light signal, all vehicles within the vehicle's lighting visibility range can receive the information. The vehicle cannot communicate individually with a specific vehicle within the lighting visibility range, which affects the communication security. Summary of the invention

[0005] To this end, the technical problem to be solved by the present invention is to overcome the problem that the visible light communication method based on vehicle lights in the prior art cannot realize individual communication between specific vehicles, resulting in difficulty in ensuring the security of information exchange during the communication process.

[0006] In order to solve the above technical problems, the present invention provides a visible light communication method based on vehicle lights, which is applied to a processor in the vehicle, wherein the vehicle also includes a digital micromirror chip, and the method includes: Controlling the vehicle to transmit a visible light detection signal to all vehicles in a target communication scene; wherein all vehicles in the target communication scene include the target communication vehicle; receiving a response signal generated by the target communication vehicle based on the visible light detection signal; Acquiring a field of view angle between the visible light detection signal and the response signal; Based on the image side focal length of the receiving end lens of the vehicle and the field of view angle, the image height of the open area of ​​the digital micromirror chip of the vehicle is calculated to obtain the current image height of the open area; The image height of the open area of ​​the digital micromirror chip of the host vehicle is adjusted to the image height of the current open area to adjust the open area of ​​the digital micromirror chip, so that the host vehicle only transmits visible light communication signals to the target communication vehicle.

[0007] In the present application, by controlling the vehicle to transmit a visible light detection signal to all vehicles in the target communication scene, and receiving a response signal returned by the target communication vehicle, the field of view angle between the visible light detection signal and the response signal can be obtained based on the response signal. Since there is a certain proportional relationship between the open area of ​​the digital micromirror chip and the range of the light signal emitted by the vehicle, the corresponding relationship between the position of the target communication vehicle and the image height of the open area of ​​the digital micromirror chip can be established based on the image side focal length of the lens of the receiving end of the vehicle and the field of view angle between the visible light detection signal and the response signal according to the principle of similar triangles and the optical magnification formula, and then the open area of ​​the digital micromirror chip is adjusted to accurately control the range of the visible light communication signal emitted by the vehicle, so that the visible light communication signal is visible only to the target communication vehicle, thereby realizing separate communication between the vehicle and the target communication vehicle and ensuring communication security.

[0008] Preferably, the vehicle further comprises a data processing module, a signal input module and a communication lamp module connected in sequence, and the communication lamp module comprises a digital micromirror chip; and adjusting the image height of the opening area of ​​the digital micromirror chip of the vehicle to the image height of the current opening area comprises: Generate a first control instruction corresponding to the image height of the current open area, and send the first control instruction to the data processing module, so that the data processing module modulates the first control instruction to generate a first digital signal and sends the first digital signal to the signal input module; The signal input module is used to convert the first digital signal into a first analog signal, and send the first analog signal to the communication vehicle light module, so as to adjust the activation area of ​​the digital micromirror chip to the current activation area.

[0009] In the present application, by generating a first control instruction corresponding to the image height of the current open area, the data processing module modulates the first control instruction to generate a first digital signal, and then the signal input module converts the first digital signal into a first analog signal and sends it to the communication vehicle light module, the open area of ​​the digital micromirror chip can be adjusted to the current open area.

[0010] Preferably, the step of calculating the image height of the open area of ​​the digital micromirror chip of the vehicle based on the image focal length of the receiving end lens of the target communication vehicle and the field of view angle to obtain the image height of the current open area includes: Calculating a tangent value of a field of view angle between the visible light detection signal and the response signal; The product of the tangent value and the image focal length of the lens of the receiving end of the vehicle is used as the image height of the current open area; The calculation formula of the image height of the open area of ​​the digital micromirror chip is: , in, represents the image height of the open area of ​​the digital micromirror chip; represents the image-side focal length of the receiving end lens of the vehicle; Represents the field of view angle between the visible light detection signal and the response signal.

[0011] Preferably, the vehicle further comprises an auxiliary vehicle light module connected to the processor; and after adjusting the opening area of ​​the digital micromirror chip, the method further comprises: A second control instruction is generated and sent to the auxiliary vehicle light module, thereby controlling the lighting of the auxiliary vehicle light module.

[0012] In the present application, while controlling the communication light module of the vehicle to communicate with the target communication vehicle individually, the auxiliary light module is controlled to emit light to illuminate the road ahead, thereby utilizing the communication light module and the auxiliary light module to jointly complete the functions of selective physical encryption optical communication and safe lighting of the road.

[0013] Preferably, controlling the vehicle to transmit a visible light detection signal to all vehicles in the target communication scene comprises: Generate and send a communication detection instruction to the data processing module, so that the data processing module modulates the communication detection instruction to generate a digital detection signal and sends the digital detection signal to the signal input module; Among them, the signal input module is used to convert the digital detection signal into a detection electrical signal, and send the detection electrical signal to the communication vehicle light module to control the digital micromirror chip to turn on, thereby emitting a visible light detection signal to all vehicles in the target communication scene.

[0014] In the present application, a communication detection instruction is generated and sent, the communication detection instruction is modulated and converted by the data processing module to obtain a digital detection signal, and then the digital detection signal is converted into a detection electrical signal by the signal input module. The detection electrical signal is used to control the digital micromirror chip in the communication vehicle light module to emit light in the full range, thereby emitting a visible light detection signal that is visible to all vehicles in the target communication scene.

[0015] Preferably, the vehicle further comprises a signal receiving module connected to the data processing module, the signal receiving module is used to receive a response optical signal generated by the target communication vehicle based on the visible light detection signal, and convert the response optical signal into a response digital signal and send it to the data processing module; the digital processing module is used to demodulate the response digital signal to obtain a response signal; the receiving of the response signal generated by the target communication vehicle based on the visible light detection signal comprises: Receive the response signal sent by the data processing module.

[0016] In the present application, after the target communication vehicle generates a response light signal based on the visible light detection signal, the signal receiving module of the vehicle receives the response light signal and converts it into a response digital signal, and the data processing module demodulates the response digital signal to obtain a response signal, so as to obtain the field of view angle between the visible light detection signal and the response signal based on the response signal.

[0017] The present invention also provides an optical communication system based on vehicle lights, comprising a memory and a processor connected to each other, wherein the memory is used to store a computer program, and when the computer program is executed by the processor, it is used to implement the above-mentioned optical communication method based on vehicle lights.

[0018] Preferably, the optical communication system further comprises a communication vehicle light module, and the communication vehicle light module comprises: A lighting module for projecting a light beam; a digital micromirror chip for generating a modulation pattern based on the light beam projected by the illumination module; A projection lens, used for projecting the modulation pattern, thereby transmitting a visible light communication signal to the target communication vehicle; The lighting module comprises: A light source for emitting light; A collimating lens group, arranged on the outgoing light path of the light source, for collimating the light emitted by the light source so that the collimated light is incident on the light homogenizing device in parallel; A light homogenizing device, arranged on the outgoing light path of the collimating lens group, and used for dividing the light emitted by the collimating lens group into a plurality of thin light beams; An integrating lens group, arranged on the outgoing light path of the light homogenizing device, and used for converging a plurality of fine light beams emitted by the light homogenizing device to the digital micromirror chip; The projection lens comprises a first projection lens, a second projection lens, a third projection lens, a fourth projection lens, a fifth projection lens, an aperture, a sixth projection lens, a seventh projection lens, an eighth projection lens and a ninth projection lens which are coaxially arranged in sequence along the optical axis from the object side to the image side of the digital micromirror chip; Wherein, the first projection lens, the third projection lens, the fifth projection lens, the sixth projection lens, the eighth projection lens and the ninth projection lens all have positive optical power; the second projection lens, the fourth projection lens and the seventh projection lens all have negative optical power; The object side surfaces of the first projection lens, the second projection lens, the third projection lens, the fifth projection lens and the ninth projection lens are all convex surfaces; The object side surfaces of the fourth projection lens, the sixth projection lens, the seventh projection lens and the eighth projection lens are all concave surfaces; The image side surfaces of the third projection lens, the sixth projection lens and the eighth projection lens are all convex surfaces; The image side surfaces of the fourth projection lens and the seventh projection lens are both concave surfaces; The third projection lens and the fourth projection lens are glued together to form a glued body, and the sixth projection lens and the seventh projection lens are glued together to form a glued body.

[0019] The present application adopts nine spherical projection lenses to form a coaxially arranged projection lens. By limiting the shape of the object side and image side of each projection lens, the first projection lens and the second projection lens are used to make the incident light of the large field of view emerge at a gentle angle, thereby reducing the field of view angle pressure of the rear projection lens; the third projection lens, the fourth projection lens and the fifth projection lens are used to correct the spherical aberration field curvature and chromatic aberration, so that the light is further flattened; the sixth projection lens and the seventh projection lens are used to further correct the chromatic aberration of the light, and finally the eighth projection lens and the ninth projection lens are used to converge the light, and the aberration and distortion are reduced by reducing the light angle, while compensating for the chromatic aberration; the projection lens provided by the present application has a large field of view angle, can expand the communication line of sight range, avoid lighting communication blind spots, and has high projection clarity. Therefore, the projection lens provided by the present application can enable the communication vehicle light module to achieve selective communication in a large field of view area.

[0020] Preferably, the half field angle of the projection lens is in the range of and / or The ratio of the length of the projection lens to the focal length is in the range of ; and / or The ratio of the back focal length to the focal length of the projection lens is in the range of ; and / or The telecentric angle of the projection lens is less than 0.2°; and / or The optical refractive index of the first projection lens, the third projection lens and the ninth projection lens is greater than 1.90, and the optical Abbe number is greater than 17.5; and / or The optical refractive index of the fifth projection lens, the sixth projection lens and the eighth projection lens is greater than 1.50, and the optical Abbe number is greater than 66.0; and / or The optical refractive index of the second projection lens, the fourth projection lens and the seventh projection lens is greater than 1.75, and the optical Abbe number is greater than 17.9; and / or The value range of the ratio of the focal length of the fifth projection lens to the effective aperture of the fifth projection lens is ; and / or The focal length of the collimating lens group ranges from , the effective aperture range is ; The divergence angle of the light after collimation by the collimating lens group is less than or equal to 10°; and / or The light homogenizing device is a fly-eye lens; and / or The integrator lens group is a right-angle total internal reflection prism; and / or The focal length of the integrating lens group is in the range of .

[0021] In the present application, by adjusting the characteristic parameters of the projection lens, the field of view of the projection lens can be further increased, so that the illumination of the projected image is more uniform; at the same time, by adjusting the optical refractive index and optical Abbe number of each projection lens, the high optical efficiency and resolution can be balanced, thereby improving the projection quality of the projection lens; in addition, by limiting the ratio of the focal length of the fifth projection lens to the effective aperture, the spherical aberration can be better balanced and the imaging quality of the projection lens can be improved. By adjusting the parameters of the collimating lens, the aperture of the light spot can be reduced and the volume of the optical component can be reduced; the illumination light path and the projection light path can be separated by using a right-angle total internal reflection prism, and the fine light beam emitted by the light homogenizing device can be better collected by adjusting the focal length of the integral lens group, thereby improving energy utilization and illumination uniformity.

[0022] Preferably, the curvature radius of a single small lens in the fly-eye lens is: , in, represents the curvature radius of a single small lens in the fly-eye lens; represents the refractive index of the fly-eye lens; represents the thickness of the fly-eye lens; The length of a single small lens in the compound eye lens is: , in, represents the length of a single small lens in the fly-eye lens; Indicates the image plane height; Indicates the image face diameter angle; represents the number of small lenses in the fly-eye lens.

[0023] The vehicle headlight-based visible light communication method provided in the present application controls the vehicle to transmit visible light detection signals to all vehicles in the target communication scene, receives the response signal generated by the target communication vehicle based on the visible light detection signal; obtains the field of view angle between the visible light detection signal and the response signal based on the response signal; calculates the image height of the open area of ​​the digital micromirror chip based on the image side focal length and the field of view angle of the lens of the receiving end of the vehicle, and adjusts the open area of ​​the digital micromirror chip, so that the vehicle only transmits visible light communication signals to the target communication vehicle. Since there is a proportional relationship between the activation area of ​​the digital micromirror chip and the imaging size (i.e., the range of the light signal emitted by the vehicle), the present application determines the field of view angle between the visible light detection signal and the response signal through the response signal generated by the target communication vehicle, and establishes a correspondence between the position of the target communication vehicle and the activation area of ​​the digital micromirror chip based on the field of view angle and the image side focal length of the lens of the receiving end of the present vehicle according to the principle of similar triangles and optical magnification, thereby controlling the activation area of ​​the digital micromirror chip and accurately controlling the range of the visible light communication signal emitted by the vehicle, so that the present vehicle can emit visible light communication signals that are only visible to the target communication vehicle, thereby realizing separate communication between the present vehicle and the target communication vehicle and ensuring safety during the communication process. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to make the content of the present invention more clearly understood, the present invention is further described in detail below according to specific embodiments of the present invention in conjunction with the accompanying drawings, wherein: Figure 1 A flow chart of the light communication method based on vehicle lights provided in this application; Figure 2 A schematic diagram of the vehicle system structure for implementing the light communication method based on vehicle lights provided in this application; Figure 3 A schematic diagram of the principle of the optical communication method based on vehicle lights provided in this application; Figure 4 A schematic diagram of the structure of the signal input module provided in this application; Figure 5 A schematic diagram of the structure of the communication vehicle light module provided for this application; Figure 6A schematic diagram of the structure of the lighting module provided in this application; Figure 7 A schematic diagram of the optical principle of the lighting module provided in this application; Figure 8 A schematic diagram of the structure of the projection lens provided in this application; Fig. 9 A schematic diagram of the structure of the signal receiving module provided in this application; Fig.10 The point diagram of each visible light band of the projection lens provided in the embodiment of the present application; wherein, Fig.10 (a) is the point diagram of the first field of view of the projection lens in the visible light band. Fig.10 (b) is the spot diagram of the visible light band of the second field of view of the projection lens. Fig.10 (c) is the spot diagram of the third field of view of the projection lens in the visible light band. Fig.10 (d) is the spot diagram of the fourth field of view of the projection lens in the visible light band. Fig.10 (e) in the figure is the spot diagram of the fifth field of view of the projection lens in the visible light band. Fig.10 (f) in the figure is the spot diagram of the sixth field angle of the projection lens in the visible light band; Fig.11 A modulation transfer function curve diagram of the projection lens provided in an embodiment of the present application; Fig.12 The field curvature and distortion curve diagram of the projection lens provided in the embodiment of the present application; wherein, Fig.12 (a) is the field curvature curve of the projection lens. Fig.12 (b) is the distortion curve of the projection lens; Fig.13 A vertical axis chromatic aberration diagram of the projection lens provided in an embodiment of the present application; Fig.14 A relative illumination diagram of a projection lens provided in an embodiment of the present application; Explanation of the reference numerals in the specification: 1. processor; 2. data processing module; 3. signal input module; 31. first converter; 32. power amplifier circuit; 33. light source driving circuit; 4. communication vehicle light module; 41. lighting module; 411. light source; 412. collimating lens group; 413. light homogenizing device; 414. integrating lens group; 42. digital micromirror chip; 43. projection lens; 430. first projection lens; 431. second projection lens; 432. third projection lens; 433. fourth projection lens; 434. fifth projection lens; 435. aperture; 436. sixth projection lens; 437. seventh projection lens; 438. eighth projection lens; 439. ninth projection lens; 44. prism; 45. protective glass; 5. signal receiving module; 51. collecting lens; 52. photodetector; 53. signal enhancement circuit; 54. filtering and noise reduction device; 55. second converter; 6. auxiliary vehicle light module. DETAILED DESCRIPTION

[0025] The present invention is further described below in conjunction with the accompanying drawings and specific embodiments so that those skilled in the art can better understand the present invention and implement it, but the embodiments are not intended to limit the present invention.

[0026] Please refer to Figure 1 and Figure 2 , Figure 1 The figure shows a flow chart of the optical communication method based on vehicle lights provided by the present application. Figure 2 The figure shows a schematic diagram of a vehicle system structure for implementing the vehicle light-based optical communication method. The vehicle light-based optical communication method provided in the present application is applied to the processor 1 of the vehicle. The vehicle also includes a digital micromirror chip 42. The method specifically includes: S10: Control the vehicle to transmit visible light detection signals to all vehicles in the target communication scene; wherein all vehicles in the target communication scene include the target communication vehicle.

[0027] The target communication vehicle is the vehicle with which this vehicle is to perform independent optical communication. After receiving the independent optical communication instruction issued by the driver of this vehicle, the target communication vehicle is selected from the current communication list; for example, assuming that the current communication list includes vehicle G1, vehicle G2 and vehicle G3, the driver can select vehicle G3 as the target communication vehicle.

[0028] In one embodiment, if Figure 2 As shown, the vehicle further includes a data processing module 2, a signal input module 3 and a communication light module 4 which are connected in sequence. The communication light module 4 includes a digital micromirror chip 42, and the data processing module 2 may be an FPGA.

[0029] The processor 1 can generate a communication detection instruction and send the communication detection instruction to the data processing module 2. The data processing module 2 modulates the communication detection instruction to generate a digital detection signal, and sends the digital detection signal to the signal input module 3. The signal input module 3 converts the digital detection signal into a detection electrical signal, and sends the detection electrical signal to the communication vehicle light module 4 to control the digital micromirror chip 42 to turn on, thereby emitting a visible light detection signal to all vehicles in the target communication scene.

[0030] It is worth noting that all visible light receiving devices in the target communication scene can receive the visible light detection signal emitted by this vehicle.

[0031] S20: Receive a response signal generated by the target communication vehicle based on the visible light detection signal.

[0032] like Figure 2 As shown, the vehicle further includes a signal receiving module 5 connected to the data processing module 2, the signal receiving module 5 is used to receive the response optical signal generated by the target communication vehicle based on the visible light detection signal, and convert the response optical signal into a response digital signal and send it to the data processing module 2. The data processing module 2 is used to demodulate the response digital signal to obtain a response signal. The processor 1 receives the response signal sent by the data processing module 2.

[0033] S30: Obtaining the field of view angle of the visible light detection signal and the response signal.

[0034] S40: Based on the image focal length and the field angle of the receiving end lens of the vehicle, the image height of the open area of ​​the digital micromirror chip of the vehicle is calculated to obtain the current image height of the open area.

[0035] Specifically, the digital micromirror chip 42 is composed of a large number of independently controllable micromirror units arranged in an array to form an image plane with a fixed aspect ratio. The field of view of the visible light communication signal emitted by the vehicle depends on the height value of the open area of ​​the digital micromirror chip 42. For example, when the open area of ​​the digital micromirror chip 42 corresponds to the micromirror unit located in the center area, the field of view is 0°. It is worth noting that the width value of the open area of ​​the digital micromirror chip 42 is determined by the body width of the vehicle and the magnification of the receiving end lens. When the body width is 1.8m, the width of the corresponding open area of ​​the digital micromirror chip 42 is 2.5mm~4mm.

[0036] The tangent value of the angle between the visible light detection signal and the response signal can be calculated first; then the product of the tangent value and the image focal length of the lens of the receiving end of the vehicle is used as the image height of the current open area. Specifically, the calculation formula of the image height of the open area of ​​the digital micromirror chip 42 is: , in, represents the image height of the open area of ​​the digital micromirror chip 42; Indicates the image focal length of the receiving end lens of this vehicle; Represents the field of view angle of the visible light detection signal and the response signal.

[0037] S50: adjusting the image height of the open area of ​​the digital micromirror chip of the vehicle to the current image height of the open area, so as to adjust the open area of ​​the digital micromirror chip, so that the vehicle transmits the visible light communication signal only to the target communication vehicle.

[0038] The processor 1 generates a first control instruction corresponding to the image height of the current open area, and sends the first control instruction to the data processing module 2, so that the data processing module 2 modulates the first control instruction to generate a first digital signal and sends the first digital signal to the signal input module 3. The signal input module 3 is used to convert the first digital signal into a first analog signal, and send the first analog signal to the communication lamp module 4, so as to adjust the open area of ​​the digital micromirror chip 42 to the current open area.

[0039] It can be understood that the activation of the separate optical communication function can be set according to specific application needs. For example, if the driver of this vehicle pre-sends private information to other vehicles, he can activate the separate optical communication function to ensure that the information is only sent to a certain vehicle.

[0040] Furthermore, if Figure 2 As shown, the vehicle also includes an auxiliary light module 6 connected to the processor 1; after adjusting the opening area of ​​the digital micromirror chip 42, it also includes: the processor 1 generates a second control instruction and sends it to the auxiliary light module 6, thereby controlling the lighting of the auxiliary light module 6.

[0041] Optionally, the auxiliary light module 6 may be a high beam light or a low beam light.

[0042] When the communication light module 4 communicates with the target communication vehicle alone, road lighting needs to be ensured. Therefore, in some embodiments of the present application, the processor 1 is used to directly control the auxiliary light module 6 for lighting, thereby ensuring the driving safety of the vehicle.

[0043] like Figure 3The figure shows a schematic diagram of the principle of the optical communication method based on vehicle lights provided by the present application. When optical communication vehicles A, B, C, D and E in multiple lanes are driving in the same direction or in the opposite direction, optical communication vehicle A emits an illumination light signal and illuminates the road ahead at the same time. The maximum communication range shown in the figure is the coverage range of the optical signal emitted by optical communication vehicle A. Optical communication vehicles within the coverage range of the optical signal can receive the optical signal from optical communication vehicle A and exchange information with optical communication vehicle A. The specific interaction content includes the road information ahead of the vehicle, the vehicle's own position and speed, or spontaneous information from the driver.

[0044] When the optical communication vehicles involve private information that needs to be communicated separately during the information interaction process, the optical communication vehicle A can selectively interact with the optical communication. For example, the optical communication vehicle A can choose to communicate separately with the optical communication vehicle C. By controlling the opening area of ​​the digital micromirror chip 42 in the optical communication vehicle A, the range of the visible light communication signal emitted by the communication vehicle light module 4 is precisely controlled, so that the visible light communication signal is only emitted to the optical communication vehicle C. At the same time, the auxiliary vehicle light module 6 is turned on to illuminate the road ahead to ensure driving safety, thereby realizing the selective physical encryption optical communication and safe road lighting functions by using the communication vehicle light module 4 and the auxiliary vehicle light module 6.

[0045] Based on the optical communication method based on vehicle lights provided in the above-mentioned embodiments, an embodiment of the present application also provides an optical communication system based on vehicle lights, the optical communication system comprising a memory and a processor connected to each other, wherein the memory is used to store a computer program, and the computer program, when executed by the processor, is used to implement the above-mentioned optical communication method based on vehicle lights.

[0046] Specifically, Figure 2 As shown, the system specifically includes a processor 1, a data processing module 2, a signal input module 3, a communication vehicle light module 4, a signal receiving module 5 and an auxiliary vehicle light module 6.

[0047] When the vehicle transmits a light signal, the processor 1 sends a communication instruction to the data processing module 2, and the data processing module 2 modulates the communication instruction to generate a digital signal and sends it to the signal input module 3; the signal input module 3 converts the digital signal into an analog signal, and then sends the analog signal to the communication light module 4 to control the opening area of ​​the digital micromirror chip 42 in the communication light module 4, thereby emitting a visible light signal. When the vehicle receives a light signal, the signal receiving module 5 converts the received light signal into a digital signal and sends it to the data processing module 2; the data processing module 2 demodulates the digital signal to obtain a communication signal, and then sends the communication signal to the processor 1, thereby realizing visible light communication between vehicles. At the same time, when the communication light module 4 performs optical communication, the processor 1 sends a control instruction to the auxiliary light module 6, thereby controlling the auxiliary light module 6 to turn on and illuminate the road ahead.

[0048] In a specific implementation manner, in conjunction with reference to Figure 2 and Figure 4 ,like Figure 4 FIG. 3 is a schematic diagram of the structure of the signal input module 3 . The signal input module 3 specifically includes a first converter 31 , a power amplifier circuit 32 and a light source driving circuit 33 .

[0049] The input end of the first converter 31 is connected to the output end of the data processing module 2 , and the output end of the first converter 31 is connected to the input end of the power amplifier circuit 32 . The first converter 31 is used to convert the digital signal into an analog electrical signal.

[0050] The output end of the power amplifier circuit 32 is connected to the input end of the light source driving circuit 33. The power amplifier circuit 32 is used to amplify the analog electrical signal output by the first converter 31 and input the amplified analog electrical signal to the light source driving circuit 33, thereby providing current for the subsequent communication vehicle light module 4.

[0051] The output end of the light source driving circuit 33 is connected to the communication vehicle light module 4 .

[0052] In a specific embodiment, Figure 5 As shown, Figure 5 It is a schematic structural diagram of a communication vehicle light module 4 , which specifically includes a lighting module 41 , a digital micromirror chip 42 and a projection lens 43 .

[0053] The lighting module 41 is used to project a light beam to the digital micromirror chip 42 .

[0054] The digital micromirror chip 42 is disposed on the outgoing light path of the illumination module 41, and is used to generate a modulation pattern based on the light beam projected by the illumination module 41. Specifically, the digital micromirror chip 42 has millions of chips, and can realize different gray levels to meet the projection illumination communication function.

[0055] The projection lens 43 is disposed on the output light path of the digital micromirror chip 42, and is used to project the modulation pattern, thereby transmitting the visible light communication signal to the target communication vehicle. Specifically, the projection lens 43 may be a DLP projection lens.

[0056] The communication vehicle light module 4 provided in the present application can provide a viewing distance with a large field of view, realize the projection functions of road surface information, pedestrian recognition information, and traffic sign information such as speed limit and road signs, and can generate high-definition projection images.

[0057] Furthermore, if Figure 6 As shown, the lighting module 41 specifically includes a light source 411 , a collimating lens group 412 , a light homogenizing device 413 and an integrating lens group 414 .

[0058] The light source 411 is used to emit light. The light source 411 can be an LED light source or a semiconductor laser light source, etc., with a color temperature of 4300K~6000K, and a color that meets the standard color of vehicle lighting, such as white, yellow or red.

[0059] In one embodiment of the present application, Figure 4 and Figure 6 The light source 411 is connected to the light source driving circuit 33 in the signal input module 3, and generates and emits high-speed flashing light under the drive of the light source driving circuit 33, wherein the flashing frequency of the light is much higher than the frequency that can be seen by the human eye.

[0060] The collimating lens group 412 is disposed on the outgoing light path of the light source 411 , and is used to collimate the light emitted by the light source 411 , so that the collimated light is incident on the light homogenizing device 413 in parallel.

[0061] Specifically, the focal length of the collimating lens group 412 satisfies the relationship:

[0062] in, represents the focal length of the collimating lens group 412; represents the effective aperture of the collimating lens group 412.

[0063] Furthermore, in some embodiments of the present application, the focal length of the collimating lens group 412 is in the range of , the effective aperture range is The divergence angle of the light after collimation by the collimating lens group 412 is less than or equal to 10°. For example, the focal length of the collimating lens group 412 can be 3 mm, 3.5 mm, 4 mm, 4.5 mm, 5 mm or 5.5 mm, the effective aperture can be 10 mm, 13 mm, 16 mm, 19 mm or 21 mm, and the divergence angle of the light after collimation can be 2°, 4°, 6° or 8°.

[0064] Specifically, by adjusting the characteristic parameters of the collimating lens group 412, better light uniformity effect and higher light efficiency can be obtained at the same time.

[0065] The light homogenizing device 413 is disposed on the outgoing light path of the collimating lens group 412 , and is used to divide the light emitted from the collimating lens group 412 into a plurality of thin light beams.

[0066] Optionally, the light homogenizing device 413 may be a square rod, a compound eye, a diffractive optical element, a super lens, or other optical devices capable of homogenizing the light spot. Preferably, the light homogenizing device 413 is a compound eye lens.

[0067] Furthermore, the fly-eye lens comprises a plurality of small lenses; Figure 7 It can be seen from the figure that when the image plane height H and the aperture angle u are known, and the thickness of the compound eye lens is L, due to the small size of a single small lens, the incident angle α and the exit angle β of the rear surface of a single small lens can be approximated as , , then the radius of curvature of a single small lens in the fly-eye lens is:

[0068] in, It represents the radius of curvature of a single lenslet in the compound eye lens; represents the refractive index of the fly-eye lens; Indicates the thickness of the fly-eye lens.

[0069] The length of a single lenslet in a compound eye lens is:

[0070] in, Represents the length of a single small lens in the compound eye lens; Indicates the image plane height; represents the aperture angle; Indicates the number of small lenses in the fly-eye lens.

[0071] The integrator lens group 414 is disposed on the outgoing light path of the light homogenizer 413 , and is used to converge the multiple light beams emitted by the light homogenizer 413 to the digital micromirror chip 42 , so that the multiple light beams are superimposed on the receiving surface of the digital micromirror chip 42 .

[0072] Specifically, the focal length of the integrating lens group 414 is determined by the beam aperture angle of the digital micromirror chip 42 and the spot diameter of the light homogenizing device 413. Therefore, the focal length of the integrating lens group 414 satisfies the relationship:

[0073] in, represents the focal length of the integrator lens group 414; represents the spot diameter of the light homogenizing device 413; represents the beam aperture angle of the digital micromirror chip 42.

[0074] Further, in some embodiments of the present application, the focal length of the integrator lens group 414 is in the range of For example, the focal length of the integrator lens group 414 may be 35 mm, 37 mm, 39 mm, or 42 mm.

[0075] Furthermore, the integrating lens group 141 is a right-angle total internal reflection prism, the air gap of the right-angle total internal reflection prism is located in the illumination light path, and the prism in the projection light path is equivalent to a flat glass. At the same time, the illumination light path is in the same horizontal direction, which simplifies the illumination design and improves the light efficiency.

[0076] Furthermore, in order to ensure that the communication vehicle light module 4 has a larger light signal control area coverage area and can ensure the imaging clarity, the projection lens 43 needs to have a large field of view and high resolution. Figure 8 As shown, the projection lens 43 provided in the present application specifically includes a first projection lens 430, a second projection lens 431, a third projection lens 432, a fourth projection lens 433, a fifth projection lens 434, an aperture 435, a sixth projection lens 436, a seventh projection lens 437, an eighth projection lens 438, a ninth projection lens 439, a flat plate composed of a prism 44, and a protective glass 45, which are coaxially arranged in sequence along the optical axis from the object side to the image side of the digital micromirror chip 42.

[0077] Among them, the first projection lens 430, the third projection lens 432, the fifth projection lens 434, the sixth projection lens 436, the eighth projection lens 438 and the ninth projection lens 439 all have positive optical power; the second projection lens 431, the fourth projection lens 433 and the seventh projection lens 437 all have negative optical power.

[0078] The object-side surfaces of the first projection lens 430 , the second projection lens 431 , the third projection lens 432 , the fifth projection lens 434 and the ninth projection lens 439 are all convex surfaces.

[0079] The object side surfaces of the fourth projection lens 433, the sixth projection lens 436, the seventh projection lens 437 and the eighth projection lens 438 are all concave surfaces. The image side surfaces of the third projection lens 432, the sixth projection lens 436 and the eighth projection lens 438 are all convex surfaces. The image side surfaces of the fourth projection lens 433 and the seventh projection lens 437 are all concave surfaces.

[0080] The projection lens 43 provided in the present application utilizes the first projection lens 430 and the second projection lens 431 to make the incident light of a large field of view emerge at a gentler angle, thereby reducing the field of view angle pressure of the rear-end lens. The second projection lens 431 with negative optical focal length has a higher refractive index and a larger light deflection degree, but it will produce a larger chromatic aberration. Therefore, the third projection lens 432, the fourth projection lens 433 and the fifth projection lens 434 are utilized to correct the spherical aberration field curvature and chromatic aberration, so that the light is further flattened; the sixth projection lens 436 and the seventh projection lens 437 further correct the chromatic aberration of the light, the eighth projection lens 438 and the ninth projection lens 439 converge the light, reduce the aberration and distortion by reducing the light angle, and compensate for the chromatic aberration at the same time. Finally, the light reaches the digital micromirror chip 42 through the flat plate formed by the prism 44 and the protective glass 45.

[0081] Furthermore, the third projection lens 432 and the fourth projection lens 433 are glued together to form a glued body, and the sixth projection lens 436 and the seventh projection lens 437 are glued together to form a glued body. The Gaussian structure of the glued body can effectively reduce the chromatic aberration value in the light.

[0082] Furthermore, the half viewing angle of the projection lens 43 has a range of And / or, the ratio of the length of the projection lens 43 to the focal length is in the range of and / or, the ratio of the back focal length of the projection lens 43 to the focal length is in the range of ; and / or, the telecentric angle of the projection lens 43 is less than 0.2°.

[0083] By adjusting the characteristic parameters of the projection lens 43 within the range of values, the field of view of the projection lens can be further increased, thereby satisfying the image telecentric design, so that the illumination of the visible light emitted by the communication vehicle light module 4 is more uniform. For example, the half field of view of the projection lens 43 can be 0°, 18°, 28°, 38°, 48°, 58° or 68°. The ratio of the length of the projection lens 43 to the focal length can be 7.5, 7.7, 7.9, 8.1 or 8.3. The ratio of the back focal length to the focal length of the projection lens 43 can be 2.6, 2.7, 2.8 or 2.9.

[0084] Furthermore, the optical refractive index of the first projection lens 430 , the third projection lens 432 and the ninth projection lens 439 is greater than 1.90, and the optical Abbe number is greater than 17.5.

[0085] Further, the optical refractive index of the fifth projection lens 434, the sixth projection lens 436 and the eighth projection lens 438 is greater than 1.50, and the optical Abbe number is greater than 66.0.

[0086] Furthermore, the optical refractive index of the second projection lens 431, the fourth projection lens 433 and the seventh projection lens 437 is greater than 1.75, and the optical Abbe number is greater than 17.9.

[0087] Specifically, by defining the optical refractive index and the optical Abbe number of each projection lens, high optical efficiency and resolving power can be balanced.

[0088] Furthermore, the ratio of the focal length of the fifth projection lens 434 to the effective aperture is in the range of By adjusting the ratio of the focal length and the effective aperture of the fifth projection lens 434 , the fifth projection lens 434 can better balance the spherical aberration.

[0089] Further, in some embodiments of the present application, the first projection lens 430, the second projection lens 431, the third projection lens 432, the fourth projection lens 433, the fifth projection lens 434, the sixth projection lens 436, the seventh projection lens 437, the eighth projection lens 438 and the ninth projection lens 439 are all glass lenses. Glass lenses have higher light transmittance, less stray light and smaller aberrations, which are beneficial to reducing the dispersion of the projection lens, thereby improving the imaging quality of the projection lens. At the same time, glass lenses have higher resistance to high and low temperatures, thereby reducing the influence of temperature on image quality and further ensuring the imaging effect.

[0090] In a specific embodiment, Fig. 9 As shown, the signal receiving module 5 specifically includes a collecting lens 51 , a photodetector 52 , a signal enhancement circuit 53 , a filtering and noise reduction device 54 and a second converter 55 .

[0091] The collecting lens 51 can enhance the amount of light signals received, thereby converging the light signals outside the vehicle lights into the photodetector 52 , making it easier for the photodetector 52 to receive the light signals.

[0092] The photodetector 52 is disposed on the outgoing light path of the collecting lens 51 , and is used to convert the received optical signal into an electrical signal, and send the electrical signal to the signal enhancement circuit 53 .

[0093] The signal enhancement circuit 53 amplifies and enhances the electrical signal sent by the photodetector 52 , and sends the amplified and enhanced electrical signal to the filtering and noise reduction device 54 .

[0094] The filtering and noise reduction device 54 filters high-frequency signals or low-frequency signals in the signal and suppresses other interfering signal noise.

[0095] The second converter 55 is connected to the filter-pass noise reduction device 54, and is used to convert the electrical signal output by the filter-pass noise reduction device 54 into a digital signal, and send the converted digital signal to the data processing module 2, so that the data processing module 2 demodulates the digital signal and transmits the demodulated signal to the processor 1.

[0096] The communication vehicle light module 4 provided in the present application is described in more detail below through a specific example, but it should be understood that the following embodiment is only for explaining and illustrating the technical solution and does not limit the scope of the present application.

[0097] Combined with reference Figure 5 , Figure 6 as well as Figure 8 This embodiment provides a communication vehicle light module 4, which includes a lighting module 41, a digital micromirror chip 42 and a projection lens 43. The lighting module 41 includes a light source 411, a collimating lens group 412, a light homogenizing device 413 and an integral lens group 414. The light homogenizing device 413 uses a fly-eye lens, and the relevant parameters of the fly-eye lens are shown in Table 1: Table 1 Optical parameters Numeric Single lenslet size (mm) 2.18×1.09 Curvature radius (mm) 3.69 quantity 9×17 Length(mm) 10 Material PC The digital micromirror chip 42 uses the automotive-grade chip DLP6631-Q1, whose light modulation area is rectangular, the modulation area size is 12.447mm*6.226mm, the pixel size is 7.6μm, and can achieve ±12° flipping.

[0098] The projection lens 43 includes a first projection lens 430, a second projection lens 431, a third projection lens 432, a fourth projection lens 433, a fifth projection lens 434, an aperture 435, a sixth projection lens 436, a seventh projection lens 437, an eighth projection lens 438 and a ninth projection lens 439 which are coaxially arranged in sequence along the optical axis from the object side to the image side of the digital micromirror chip 42.

[0099] In this embodiment, the projection lens 43 covers two driving roads with a width of about 5.6m. Assuming that the lateral size of the illumination beam 5m in front of the headlight is consistent with the road, due to the axial symmetry of the optical system, the ratio of the longitudinal size to the lateral size of the illumination beam at 5m is equal to the ratio of the longitudinal size to the lateral size of the digital micromirror chip 42. The diagonal size of the automotive-grade chip DLP6631-Q1 is 0.55 inches, and the aspect ratio is 2:1, so the longitudinal size is 2.8m. Therefore, the focal length f of the projection lens 43 can be determined as:

[0100] in, Indicates the image height before zooming; Indicates the image height after zooming. Indicates the projection distance.

[0101] Field of view of projection lens 43 for: , The specific optical parameters of the projection lens 43 are shown in Table 2: Table 2 (surface) Curvature radius (mm) Center thickness(mm) Refractive index(Nd) Abbe number (Vd) Face type Physical surface unlimited unlimited 1 56.267 4.05 1.90 37.1 Spherical 2 321.443 0.2 Spherical 3 28.42 2.96 1.82 46.6 Spherical 4 8.097 4.06 Spherical 5 28.859 4.71 1.96 17.5 Spherical 6 -25.9 5.61 1.75 52.3 Spherical 7 7.907 2.82 Spherical 8 21.479 5.99 1.50 66.0 Spherical 9 -8.6 0.08 Spherical 10 unlimited 4.33 Spherical 11 -68.445 6.05 1.73 54.7 Spherical 12 -9.535 3.61 1.95 17.9 Spherical 13 43.66 1.07 Spherical 14 -299.159 6.0 1.59 68.3 Spherical 15 -16.476 0.21 Spherical 16 48.2 5.96 1.96 17.5 Spherical 17 -39.515 1.36 Spherical 18 unlimited 25.4 1.52 64.2 flat 19 unlimited 2.000 flat 20 unlimited 1.100 1.52 64.2 flat 21 unlimited 0.510 flat 22 unlimited Digital micromirror chip image plane See also Fig.10 , Fig.10 FIG. 4 is a point diagram of each visible light band of the projection lens 43 provided in this embodiment; wherein, Fig.10 (a) is a point diagram of the first viewing angle of the projection lens 43 in the visible light band. Fig.10 (b) is a point diagram of the visible light band of the second field angle of the projection lens 43. Fig.10 (c) is a point diagram of the third field angle of the projection lens 43 in the visible light band. Fig.10 (d) in FIG. 4 is a point diagram of the fourth field angle of the projection lens 43 in the visible light band. Fig.10 (e) in FIG. 4 is a point diagram of the fifth field angle of the projection lens 43 in the visible light band. Fig.10 (f) in FIG. 1 is a spot diagram of the visible light band of the sixth field angle of the projection lens 43 , in which OBJ represents the object and IMA represents the image.

[0102] The spot diagram of the projection lens 43 in the visible light band of each field of view is the light spot formed when the light intersects with the image plane in each field of view. The size of the light spot is calculated with reference to the main light, and is divided into the root mean square (RMS) radius and the geometric (GEO) radius. Among them, the RMS radius first calculates the root mean square of the distance between each light ray and the main light ray among all the light rays, and then calculates the square root of each root mean square; and the GEO radius is the distance from the main light ray to the farthest light ray. Since the RMS radius depends on each light ray, the RMS radius is used as a reference in this embodiment. The more concentrated the light spot is, the higher the imaging quality of the projection lens 43 is.

[0103] Specifically, according to Fig.10 It is calculated from the point diagram shown that the RMS radius of the first field angle of the projection lens 43 provided in this embodiment is 2.885μm, the RMS radius of the second field angle is 5.542μm, the RMS radius of the third field angle is 7.407μm, the RMS radius of the fourth field angle is 8.677μm, the RMS radius of the fifth field angle is 10.796μm, and the RMS radius of the sixth field angle is 14.438μm. It can be seen that all the light falls into the pixel micromirror of the digital micromirror chip 42, indicating that the digital micromirror chip 42 can control all light in the field of view.

[0104] See also Fig.11 , Fig.11 The figure shows a modulation transfer function (MTF) curve of the projection lens 43 provided in this embodiment, wherein the ordinate is the modulation transfer function value, and the abscissa is the spatial frequency in cycles per mm; 0.00 (deg)-Tangential, 9.60 (deg)-Tangential, 16.00 (deg)-Tangential, 22.40 (deg)-Tangential, 27.20 (deg)-Tangential and 32.00 (deg)-Tangential represent the 0 degree meridian, 9.6 degree meridian, 16 degree meridian, 22.4 degree meridian, 27.2 degree meridian, respectively. and 32 degree meridian; 0.00 (deg)-Sagittal, 9.60 (deg)-Sagittal, 16.00 (deg)-Sagittal, 22.40 (deg)-Sagittal, 27.20 (deg)-Sagittal and 32.00 (deg)-Sagittal represent 0 degree sagittal line, 9.6 degree sagittal line, 16 degree sagittal line, 22.4 degree sagittal line, 27.2 degree sagittal line and 32 degree sagittal line respectively. The MTF curve represents the relationship between the modulation degree and the number of line pairs per millimeter in the image, and is used to evaluate the ability of the projection lens 43 to restore the details of the scene.

[0105] Since the resolution of the communication vehicle light module 4 is composed of the resolution of the digital micromirror chip 42 and the projection lens 43, the resolution of the projection lens 43 needs to match the resolution of the digital micromirror chip 42. The pixel size of the digital micromirror chip 42 provided in this embodiment is 7.6μm. According to the resolution calculation formula, the resolution of the digital micromirror chip 42 is 1 / (2*0.0076mm)=661p / mm. Combined with general design standards, the MTF function of the projection lens 43 can be greater than 0.4 at the cutoff frequency of 661p / mm. Fig.11 It can be seen from the figure that the projection lens 43 provided in this embodiment meets this design standard and has a higher definition.

[0106] See also Fig.12 , Fig.12 FIG. 4 is a graph showing the field curvature and distortion curves of the projection lens 43 provided in this embodiment, wherein: Fig.12 (a) is a field curvature curve diagram of the projection lens 43, the ordinate is the field size, and the abscissa is the field curvature size; Fig.12(b) is a distortion curve diagram of the projection lens 43, where the ordinate is the field of view size and the abscissa is the distortion percentage; 0.6563-Tangential, 0.5876-Tangential and 0.4861-Tangential represent meridians with wavelengths of 0.6563, 0.5876 and 0.4861 respectively; 0.6563-Sagittal, 0.5876-Sagittal and 0.4861-Sagittal represent sagittals with wavelengths of 0.6563, 0.5876 and 0.4861 respectively.

[0107] Field curvature refers to the bending of the image field, which is used to indicate the degree of non-coincidence between the focus of the entire light beam in the optical component and the ideal image point. Distortion refers to the aberration of different magnifications of different parts of an object when it is imaged through an optical component. Distortion will cause the similarity of the object and image to deteriorate, but will not affect the clarity of the image. In general optical systems, as long as the image deformation caused by distortion is not noticeable to the human eye, that is, the distortion value is less than 5%.

[0108] from Fig.12 It can be seen that the field curvature of the projection lens 43 provided in this embodiment is within the range of plus or minus 0.1, and the distortion value is less than 2.5%, indicating that the projection lens 3 provided in this embodiment meets the visual requirements of the human eye.

[0109] See also Fig.13 , Fig.13 The vertical axis chromatic aberration diagram of the projection lens 43 provided in this embodiment is shown. The ordinate is the normalized pupil coordinate, and the abscissa is the chromatic aberration value. 0.656, 0.588 and 0.486 represent the wavelength of light. Vertical axis chromatic aberration refers to the color difference around the image caused by the different magnification of light of different colors, which makes the image blurred. Fig.13 It can be seen from the figure that the vertical axis chromatic aberration value of the projection lens 43 provided in this embodiment is within one pixel, indicating that the vertical axis chromatic aberration value of the projection lens 43 is small, thereby ensuring the clarity of the projected image.

[0110] See also Fig.14 , Fig.14 The relative illumination diagram of the projection lens 43 provided in this embodiment is shown, with the ordinate being the relative illumination and the abscissa being the vertical field of view angle. It can be seen from the figure that this embodiment adopts a large through-light design with an F number of 2.2 to ensure that the light source can evenly illuminate the road surface. Therefore, the illumination distribution decreases by 10% from the central field of view to the edge field of view, indicating that the illumination distribution of the projection lens 43 provided in this embodiment is relatively uniform.

[0111] The present application provides a method and system for optical communication based on vehicle lights, which mainly solves the communication security and encryption problems in the process of visible light communication of vehicle lighting. The system includes a vehicle processor, a data processing module, a signal input module, a communication vehicle light module, a signal receiving module and an auxiliary vehicle light module. The communication vehicle light module can project visible light containing communication information to a predetermined area, while taking into account the projection function to realize the projection of vehicle interactive information. It can not only provide a viewing distance with a large field of view angle and improve the optical communication range, but also control the visible light irradiation area, perform selective optical communication functions, and ensure the security of optical communication interaction.

[0112] By combining visible light communication with digital projection headlights, the road environment, pedestrians and vehicles can be intelligently identified based on the detection system installed in the vehicle. After rapid analysis, the visible light beam emitted by the vehicle can be adjusted in a timely manner, so that the beam can be selectively projected to a predetermined area containing a receiving device, and targeted communication can be carried out with the target vehicle, ensuring the security of visible light communication. At the same time, it can also realize the projection of road surface information, pedestrian identification information, speed limit, road signs and other traffic signs.

[0113] Those skilled in the art will appreciate that the embodiments of the present application may be provided as methods, systems, or computer program products. Therefore, the present application may adopt the form of a complete hardware embodiment, a complete software embodiment, or an embodiment combining software and hardware. Moreover, the present application may adopt the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program codes.

[0114] The present application is described with reference to the flowcharts and / or block diagrams of the methods, devices (systems), and computer program products according to the embodiments of the present application. It should be understood that each process and / or box in the flowchart and / or block diagram, as well as the combination of the processes and / or boxes in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to generate a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowchart and / or block diagram. Figure 1 A process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0115] These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing device to operate in a specific manner, so that the instructions stored in the computer-readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1A process or multiple processes and / or boxes Figure 1 A function specified in one or more boxes.

[0116] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operating steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing instructions for implementing the process. Figure 1 A process or multiple processes and / or boxes Figure 1 A step that specifies a function in one or more boxes.

[0117] Obviously, the above embodiments are merely examples for the purpose of clear explanation and are not intended to limit the implementation methods. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. The obvious changes or modifications derived therefrom are still within the scope of protection of the present invention.

Claims

1. An optical communication method based on vehicle lights, characterized in that: A processor used in a vehicle, wherein the vehicle further comprises a digital micromirror chip, wherein the method comprises: Control the vehicle to transmit a visible light detection signal to all vehicles in a target communication scene; wherein all vehicles in the target communication scene include the target communication vehicle; receiving a response signal generated by the target communication vehicle based on the visible light detection signal; Acquire the field of view angle of the visible light detection signal and the response signal; Based on the image focal length of the receiving end lens of the vehicle and the field of view angle, the image height of the open area of ​​the digital micromirror chip of the vehicle is calculated to obtain the current image height of the open area; The image height of the open area of ​​the digital micromirror chip of the host vehicle is adjusted to the image height of the current open area to adjust the open area of ​​the digital micromirror chip, so that the host vehicle only transmits visible light communication signals to the target communication vehicle.

2. The optical communication method based on vehicle lights according to claim 1, characterized in that: The vehicle further includes a data processing module, a signal input module, and a communication lamp module connected in sequence, wherein the communication lamp module includes a digital micromirror chip; and adjusting the image height of the opening area of ​​the digital micromirror chip of the vehicle to the image height of the current opening area includes: Generate a first control instruction corresponding to the image height of the current open area, and send the first control instruction to the data processing module, so that the data processing module modulates the first control instruction to generate a first digital signal and sends the first digital signal to the signal input module; The signal input module is used to convert the first digital signal into a first analog signal, and send the first analog signal to the communication vehicle light module, so as to adjust the activation area of ​​the digital micromirror chip to the current activation area.

3. The light communication method based on vehicle lights according to claim 1 or 2, characterized in that: The step of calculating the image height of the open area of ​​the digital micromirror chip of the vehicle based on the image focal length of the receiving end lens of the target communication vehicle and the field of view angle to obtain the image height of the current open area includes: Calculating a tangent value of a field of view angle between the visible light detection signal and the response signal; The product of the tangent value and the image focal length of the lens of the receiving end of the vehicle is used as the image height of the current open area; The calculation formula of the image height of the open area of ​​the digital micromirror chip is: ， in, represents the image height of the open area of ​​the digital micromirror chip; represents the image-side focal length of the receiving end lens of the vehicle; Represents the field of view angle between the visible light detection signal and the response signal.

4. The optical communication method based on vehicle lights according to claim 2, characterized in that: The vehicle further includes an auxiliary vehicle light module connected to the processor; After adjusting the open area of ​​the digital micromirror chip, the method further includes: A second control instruction is generated and sent to the auxiliary vehicle light module, thereby controlling the lighting of the auxiliary vehicle light module.

5. The optical communication method based on vehicle lights according to claim 2, characterized in that: Controlling the vehicle to transmit a visible light detection signal to all vehicles in the target communication scene includes: Generate and send a communication detection instruction to the data processing module, so that the data processing module modulates the communication detection instruction to generate a digital detection signal and sends the digital detection signal to the signal input module; Among them, the signal input module is used to convert the digital detection signal into a detection electrical signal, and send the detection electrical signal to the communication vehicle light module to control the digital micromirror chip to turn on, thereby emitting a visible light detection signal to all vehicles in the target communication scene.

6. The optical communication method based on vehicle lights according to claim 1, characterized in that: The vehicle further comprises a signal receiving module connected to the data processing module, the signal receiving module being used to receive a response optical signal generated by the target communication vehicle based on the visible light detection signal, and convert the response optical signal into a response digital signal and send it to the data processing module; The digital processing module is used to demodulate the response digital signal to obtain a response signal; The receiving a response signal generated by the target communication vehicle based on the visible light detection signal comprises: Receive the response signal sent by the data processing module.

7. An optical communication system based on vehicle lights, comprising a memory and a processor connected to each other, wherein: The memory is used to store a computer program, and when the computer program is executed by the processor, it is used to implement the optical communication method based on vehicle lights according to any one of claims 1 to 6.

8. The vehicle light-based optical communication system according to claim 7, characterized in that: The optical communication system further includes a communication vehicle light module, and the communication vehicle light module includes: A lighting module for projecting a light beam; a digital micromirror chip for generating a modulation pattern based on the light beam projected by the illumination module; A projection lens, used for projecting the modulation pattern, thereby transmitting a visible light communication signal to the target communication vehicle; The lighting module comprises: A light source for emitting light; A collimating lens group, arranged on the outgoing light path of the light source, for collimating the light emitted by the light source so that the collimated light is incident on the light homogenizing device in parallel; A light homogenizing device, arranged on the outgoing light path of the collimating lens group, and used for dividing the light emitted by the collimating lens group into a plurality of thin light beams; An integrating lens group, arranged on the outgoing light path of the light homogenizing device, and used for converging a plurality of fine light beams emitted by the light homogenizing device to the digital micromirror chip; The projection lens comprises a first projection lens, a second projection lens, a third projection lens, a fourth projection lens, a fifth projection lens, an aperture, a sixth projection lens, a seventh projection lens, an eighth projection lens and a ninth projection lens which are coaxially arranged in sequence along the optical axis from the object side to the image side of the digital micromirror chip; Wherein, the first projection lens, the third projection lens, the fifth projection lens, the sixth projection lens, the eighth projection lens and the ninth projection lens all have positive optical power; the second projection lens, the fourth projection lens and the seventh projection lens all have negative optical power; The object side surfaces of the first projection lens, the second projection lens, the third projection lens, the fifth projection lens and the ninth projection lens are all convex surfaces; The object side surfaces of the fourth projection lens, the sixth projection lens, the seventh projection lens and the eighth projection lens are all concave surfaces; The image side surfaces of the third projection lens, the sixth projection lens and the eighth projection lens are all convex surfaces; The image side surfaces of the fourth projection lens and the seventh projection lens are both concave surfaces; The third projection lens and the fourth projection lens are glued together to form a glued body, and the sixth projection lens and the seventh projection lens are glued together to form a glued body.

9. The vehicle light-based optical communication system according to claim 8, characterized in that: The half field angle of the projection lens has a range of and / or The ratio of the length of the projection lens to the focal length is in the range of ; and / or The ratio of the back focal length to the focal length of the projection lens is in the range of ; and / or The telecentric angle of the projection lens is less than 0.2°; and / or The optical refractive index of the first projection lens, the third projection lens and the ninth projection lens is greater than 1.90, and the optical Abbe number is greater than 17.5; and / or The optical refractive index of the fifth projection lens, the sixth projection lens and the eighth projection lens is greater than 1.50, and the optical Abbe number is greater than 66.0; and / or The optical refractive index of the second projection lens, the fourth projection lens and the seventh projection lens is greater than 1.75, and the optical Abbe number is greater than 17.9; and / or The value range of the ratio of the focal length of the fifth projection lens to the effective aperture of the fifth projection lens is ; and / or The focal length of the collimating lens group ranges from , the effective aperture range is ; The divergence angle of the light after collimation by the collimating lens group is less than or equal to 10°; and / or The light homogenizing device is a fly-eye lens; and / or The integrator lens group is a right-angle total internal reflection prism; and / or The focal length of the integrating lens group is in the range of .

10. The vehicle light-based optical communication system according to claim 9, characterized in that: The curvature radius of a single small lens in the fly-eye lens is: ， in, represents the curvature radius of a single small lens in the fly-eye lens; represents the refractive index of the fly-eye lens; represents the thickness of the fly-eye lens; The length of a single small lens in the compound eye lens is: ， in, represents the length of a single small lens in the fly-eye lens; Indicates the image plane height; Indicates the image face diameter angle; represents the number of small lenses in the fly-eye lens.

Images