CN114415881A - Meta-universe skiing system with real-time cloud-linked elements in ski field environment - Google Patents

Meta-universe skiing system with real-time cloud-linked elements in ski field environment Download PDF

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CN114415881A
CN114415881A CN202210077636.0A CN202210077636A CN114415881A CN 114415881 A CN114415881 A CN 114415881A CN 202210077636 A CN202210077636 A CN 202210077636A CN 114415881 A CN114415881 A CN 114415881A
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skiing
cloud
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CN114415881B (en
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王宏
岳再拓
李坦
兰钦
李子阳
张波
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Northeastern University China
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Northeastern University China
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    • GPHYSICS
    • G06COMPUTING; CALCULATING OR COUNTING
    • G06FELECTRIC DIGITAL DATA PROCESSING
    • G06F3/00Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
    • G06F3/01Input arrangements or combined input and output arrangements for interaction between user and computer
    • G06F3/048Interaction techniques based on graphical user interfaces [GUI]
    • G06F3/0481Interaction techniques based on graphical user interfaces [GUI] based on specific properties of the displayed interaction object or a metaphor-based environment, e.g. interaction with desktop elements like windows or icons, or assisted by a cursor's changing behaviour or appearance
    • G06F3/04815Interaction with a metaphor-based environment or interaction object displayed as three-dimensional, e.g. changing the user viewpoint with respect to the environment or object
    • GPHYSICS
    • G06COMPUTING; CALCULATING OR COUNTING
    • G06FELECTRIC DIGITAL DATA PROCESSING
    • G06F21/00Security arrangements for protecting computers, components thereof, programs or data against unauthorised activity
    • G06F21/30Authentication, i.e. establishing the identity or authorisation of security principals
    • G06F21/31User authentication
    • GPHYSICS
    • G06COMPUTING; CALCULATING OR COUNTING
    • G06FELECTRIC DIGITAL DATA PROCESSING
    • G06F21/00Security arrangements for protecting computers, components thereof, programs or data against unauthorised activity
    • G06F21/60Protecting data
    • G06F21/602Providing cryptographic facilities or services
    • GPHYSICS
    • G06COMPUTING; CALCULATING OR COUNTING
    • G06FELECTRIC DIGITAL DATA PROCESSING
    • G06F21/00Security arrangements for protecting computers, components thereof, programs or data against unauthorised activity
    • G06F21/60Protecting data
    • G06F21/62Protecting access to data via a platform, e.g. using keys or access control rules
    • GPHYSICS
    • G16INFORMATION AND COMMUNICATION TECHNOLOGY [ICT] SPECIALLY ADAPTED FOR SPECIFIC APPLICATION FIELDS
    • G16YINFORMATION AND COMMUNICATION TECHNOLOGY SPECIALLY ADAPTED FOR THE INTERNET OF THINGS [IoT]
    • G16Y10/00Economic sectors
    • G16Y10/65Entertainment or amusement; Sports
    • GPHYSICS
    • G16INFORMATION AND COMMUNICATION TECHNOLOGY [ICT] SPECIALLY ADAPTED FOR SPECIFIC APPLICATION FIELDS
    • G16YINFORMATION AND COMMUNICATION TECHNOLOGY SPECIALLY ADAPTED FOR THE INTERNET OF THINGS [IoT]
    • G16Y20/00Information sensed or collected by the things
    • G16Y20/10Information sensed or collected by the things relating to the environment, e.g. temperature; relating to location

Abstract

The invention provides a meta-universe skiing system with elements in a ski field environment linked in a cloud real-time mode, and relates to the technical field of intersection of mechanical and electronic engineering and sports. The system comprises: the ski field environment element sensing module is responsible for sensing environment element changes in a real ski field, receiving cloud instructions and uploading collected data to a cloud; the VR skiing module is responsible for uploading instructions for starting and stopping data acquisition to the cloud end, receiving data forwarded by the cloud end in real time, and displaying data of skiing scenes in real time and rendering scenes; the cloud real-time link module is responsible for connection and data transmission among the modules, and the data transmission adopts SSL certificates for authentication and encryption. The invention integrates the robot technology, the virtual reality technology, the Internet of things technology and the artificial intelligence technology, is applied to mass sports, establishes a Yuan universe skiing system, breaks through the condition limitations of seasons, places and the like, and enables people to experience the geographical features of the skiing place indoors and feel alpine skiing, free skiing and the like.

Description

Meta-universe skiing system with real-time cloud-linked elements in ski field environment
Technical Field
The invention relates to the technical field of intersection of mechanical and electronic engineering and sports, in particular to a Yuanzhou skiing system with elements in a ski field environment linked in a cloud in real time.
Background
The ice and snow movement is limited by weather conditions, namely, the ice and snow movement is relatively short in the northern snow season of China. Therefore, Virtual Reality (VR) skiing systems have begun to move towards the field of vision of people, but existing VR skiing systems cannot be linked with real ski field environment elements in real time, and the reality of skiing experience is greatly weakened.
In order to increase the skiing reality sense of the experiencer, a metaclass skiing system needs to be established, virtual and real seamless connection is achieved, the science popularization of skiing sports for the masses can be facilitated, meanwhile, the condition limitations such as seasons and places can be broken through, people can experience the geographic features of the skiing places indoors, projects such as alpine skiing and free skiing are experienced, and new life is brought to the skiing sports.
Disclosure of Invention
The technical problem to be solved by the invention is to provide a meta-universe skiing system with elements of a ski field environment linked in a cloud real-time manner, which is to integrate a robot technology, a virtual reality technology, an internet of things technology and an artificial intelligence technology, and is applied to mass sports to establish a skiing digital sports system, realize the real-time linkage of a real ski field and a virtual ski field through a multi-mode sensor, and enable an experiencer to experience the wind direction, the wind speed and the skiing resistance of a certain real ski field in real time. The system can break through the condition limitations such as seasons and places, and people can experience the geographical features of the skiing place indoors and feel items such as alpine skiing and free skiing.
In order to solve the technical problems, the technical scheme adopted by the invention is as follows:
a meta-universe skiing system with ski field environment elements linked in real time in a cloud end comprises a ski field environment element sensing module, a VR skiing module and a cloud end real-time linking module; the ski field environment element sensing module is responsible for sensing environment element changes in a real ski field, receiving cloud instructions and uploading collected data to a cloud; the VR skiing module is responsible for uploading instructions for starting and stopping data acquisition to the cloud end, receiving data forwarded by the cloud end in real time, and displaying data of skiing scenes in real time and rendering scenes; the cloud real-time link module is responsible for connection and data transmission among the modules;
the ski field environment element sensing module comprises a data acquisition end, a data receiving end and a 5G wireless network card; the data acquisition end acquires data of each sensor in the ski field, the data receiving end receives the acquired data and judges the data, and if the data are changed, the 5G wireless network card is used for uploading the processed data to the cloud end;
the VR skiing module builds a VR skiing scene based on a Unity3D engine, uses C # script programming to establish connection with a cloud end, so as to be linked with the ski field environment element sensing module in real time, associates the acquired real-time information with a 3D model and an object model in the scene, and realizes the dynamism of the VR scene by changing the terrain, sound and sliding resistance of the scene;
the cloud real-time linking module deploys the server at the cloud, so that the ski field environment element sensing module and the VR skiing module which are far away from each other are interconnected and share data through the Internet; the cloud real-time link module is designed by adopting a C/S (client/server) framework, and meanwhile, the identity authentication and encryption communication are realized by using an SSL (secure socket layer) certificate, so that the confidentiality and the reliability of data transmission are ensured;
the data transmission adopts SSL certificate to carry out authentication and encryption, the SSL certificate protocol is divided into two layers, including handshake protocol and recording protocol;
the handshake protocol is used for interacting the client and the server for the first time before the actual dynamic environment element data transmission starts, carrying out identity authentication through a digital certificate, and negotiating an encryption method after the identity is confirmed to be correct; adopting two encryption algorithms of RSA and AES, encrypting original data by the AES algorithm, and encrypting the AES by the RSA algorithm; the recording protocol is a handshake protocol, and the encryption and transmission of text content are started after the secure communication is established, and the specific process is as follows:
step 1: both the server and the client generate a pair of RSA secret keys, each of which has well-managed private key and sends the public key to the other party;
step 2: the server generates a key to be used by AES encryption by using a random function;
and step 3: the server encrypts the data to be transmitted by using the key generated in the previous step by using an AES (advanced encryption Standard);
and 4, step 4: the server encrypts the generated random Key by using the public Key given by the client;
and 5: the server sends the data encrypted by the AES and the random key encrypted by the public key sent by the client to the client together;
step 6: after the client side takes the data sent by the server, the encrypted random key is decrypted by using the private key of the client side, and then the data encrypted by the AES is decrypted by using the random key which is decrypted successfully to obtain the final data.
The data of each sensor of the ski field comprises temperature, humidity, wind speed, wind direction and altitude, wherein the temperature, the humidity, the wind speed and the wind direction are directly measured by using the corresponding sensor of the ski field, and the altitude is indirectly obtained through a barometer.
The data acquisition end comprises an Arduino mainboard and a sensor module, the sensor module comprises a wind speed sensor module, a wind direction sensor module, a temperature and humidity sensor module and a barometer, the sensor module connects each analog voltage acquired by the sensor module to an analog input port of the Arduino mainboard, and the Arduino mainboard obtains a corresponding data value after voltage conversion; the data receiving end uses a raspberry group to carry out serial port communication with the Arduino mainboard, meanwhile, a USB-to-TTL data line is used for obtaining barometer data, the start and stop of data acquisition are realized by controlling the opening and closing of a serial port, the raspberry group receives the data and judges the data, and if the data are changed, a 5G wireless network card is used for uploading the processed data to a cloud end;
the VR skiing module is used for receiving environmental elements in a real skiing field in real time and performing dynamic feedback, and the whole design stage comprises three parts, namely the establishment of a VR skiing scene, the linkage with a cloud end and the dynamic feedback of a virtual skiing system;
during the establishment of the VR skiing scene, the terrain data and the dynamic environment elements of the real field are restored according to the modeling of the actual skiing field, and the VR virtual scene demonstration is carried out; the virtual skiing scene is based on a Unity3D engine, required model materials are dragged into the scene, the model is placed according to the proportion and the pattern of a real free ski field, necessary ground environment, light source, sky box and sound are added to bake the atmosphere of the scene, script development is carried out through C # language, the virtual reality software environment is built by using Oculus software and Steam VR and VRTK in Steam, and 3D imaging of a virtual skiing system picture is realized by using Oculus Rift;
the link with the cloud end means that the Unity3D client end transmits data with the cloud end, namely a server, through a compiled C # script;
in the dynamic feedback of the virtual skiing system, after the real skiing field environment element data is transmitted to the VR skiing scene through the cloud, the acquired environment element related data is associated with the static 3D model and the object model, a real-time dynamic model is obtained by changing the terrain, sound and sliding resistance of the VR skiing scene, and actual parameters corresponding to the object model are displayed in real time; the user experiences the change of dynamic environment element through virtual skiing scene, observes through VR equipment and display screen.
Adopt the produced beneficial effect of above-mentioned technical scheme to lie in: the invention provides a meta-universe skiing system with real-time cloud-linked ski field environment elements, which is characterized in that a robot technology, a virtual reality technology, an Internet of things technology and an artificial intelligence technology are fused, a ski field environment element sensing module can sense and collect environment elements of the wind direction, the wind speed, the temperature and the humidity and the altitude of a real ski field, a VR skiing module is in real-time synchronization with the environmental change of the ski field through a cloud real-time link module, the real ski field and the virtual ski field are linked in real time through a multi-mode sensor, and an experiencer using the system can sense the wind direction, the wind speed and the skiing resistance of a certain linked real ski field in real time. The system can help athletes adapt to environmental changes in advance and adjust tactics according to environmental elements at that time, and can be used for skiing training of athletes in spring, summer and autumn and lifelike skiing experience of non-athletes. The system can break through the condition limitations of seasons, places and the like, and enables people to experience the geographical features of the skiing place indoors and feel projects such as alpine skiing, free skiing and the like.
Drawings
FIG. 1 is a block diagram of the overall architecture of a system provided by an embodiment of the present invention;
FIG. 2 is a flow chart of a ski field environment element sensing module according to an embodiment of the present invention;
fig. 3 is a flow chart of SSL certificates provided by an embodiment of the present invention;
FIG. 4 is a flow chart of a metastic ski field provided by an embodiment of the present invention;
FIG. 5 is a schematic diagram of a system field test provided by an embodiment of the present invention;
fig. 6 is a schematic diagram of a meta-skiing experience according to an embodiment of the present invention.
In the figure: 1. a VR display view; 2. a VR head mounted display device; 3. a snowboard.
Detailed Description
The following detailed description of embodiments of the present invention is provided in connection with the accompanying drawings and examples. The following examples are intended to illustrate the invention but are not intended to limit the scope of the invention.
A meta-universe skiing system with real-time cloud-linked ski field environment elements is shown in figure 1 and comprises a ski field environment element sensing module, a VR skiing module and a cloud real-time link module. The ski field environment element sensing module is responsible for sensing environment element changes in a real ski field, receiving cloud instructions and uploading collected data to a cloud. The VR skiing module is responsible for uploading instructions for starting and stopping data acquisition to the cloud end, receiving data forwarded by the cloud end in real time, and displaying data of skiing scenes in real time and rendering scenes. The cloud real-time link module is responsible for connection and data transmission among the modules.
The ski field environment element sensing module comprises a data acquisition end, a data receiving end and a 5G wireless network card. The data acquisition end acquires data of each sensor in the ski field, the data receiving end receives the acquired data and judges the data, and if the data are changed, the 5G wireless network card is used for uploading the processed data to the cloud.
The data of each sensor of the ski field comprises temperature, humidity, wind speed, wind direction and altitude, wherein the temperature, the humidity, the wind speed and the wind direction are directly measured by using the corresponding sensor of the ski field, and the altitude is indirectly obtained through a barometer. The data acquisition end includes Arduino mainboard and sensor module, and sensor module includes wind speed sensor module, wind direction sensor module, temperature and humidity sensor module and barometer.
The induction part of the wind speed sensor consists of three hemispherical hollow wind cups. The wind cups are fixed on three-fork star-shaped supports which are mutually formed into 120 degrees, the concave surfaces of the cups are arranged along one direction, and the whole cross arm support is fixed on a vertical rotating shaft. When wind blows, the wind pressure borne by the wind cup with the concave surface facing the wind is the largest, the wind pressure borne by the wind cup with the convex surface facing the wind is smaller than that borne by the wind cup with the concave surface facing the wind due to the streaming action of the wind, the wind cup starts to rotate due to the pressure difference between the wind cups in the direction perpendicular to the axis of the wind cup, the wind speed is larger, the initial pressure difference is larger, the generated acceleration is larger, and the wind cup rotates faster. After the wind cups start to rotate, the wind cups with the concave surfaces facing the wind rotate along the direction of the wind, the wind pressure is relatively reduced, the wind cups with the convex surfaces facing the wind rotate at the same speed facing the wind, the wind pressure is relatively increased, the wind pressure difference is continuously reduced, and after a period of time (when the wind speed is constant), the partial pressure difference acting on the three wind cups is zero, and the wind cups rotate at a constant speed. When the wind cup rotates, the coaxial multi-tooth optical cutting disk is driven to rotate, a pulse signal which is in direct proportion to the rotating speed of the wind cup is obtained through a circuit, the pulse signal is counted by a counter, and an actual wind speed value can be obtained after conversion.
The wind direction sensor adopts a mechanical structure of a wind vane, and when wind blows to the tail wing of the wind vane, the arrow of the wind vane can indicate the blowing direction of the wind. In order to maintain the sensitivity to the direction, an absolute Gray code disc is adopted, and corresponding wind direction information can be accurately output according to the photoelectric signal conversion principle.
Temperature and humidity information is acquired by adopting an HMP60 temperature and humidity acquisition module, the module takes a temperature and humidity integrated probe as a temperature measurement element, temperature and humidity signals are acquired, and the acquired signals are converted into current signals or voltage signals which are in linear relation with the temperature and the humidity after being processed by circuits such as voltage stabilization filtering, operational amplification, nonlinear correction, V/I conversion, constant current and reverse protection and the like, and then are output.
The barometric pressure value P is measured by a barometer, and then the altitude H is calculated according to a pressure height formula. The pressure height formula is:
Figure BDA0003484681120000041
wherein, P0Is at standard atmospheric pressure (101.325kPa), H0Is a height compensation value. Because the atmospheric pressure is greatly influenced by the environment such as temperature, wind power and the like, a compensation value needs to be calibrated before the test is started, the measurement is carried out at the position with the known altitude, and the difference value between the measured value and the actual value is compensated.
The sensor module is connected to the simulation input port of the Arduino mainboard with each analog voltage that it gathered, and the Arduino mainboard obtains corresponding data value after the voltage conversion. The data receiving terminal uses the raspberry group, carries out serial communication with the Arduino mainboard, uses USB to change the TTL data line simultaneously and obtains the barometer data, through opening and closing of control serial ports realize data acquisition's beginning and stop, the raspberry group receives behind the data and judges data, if data change, uses 5G wireless network card to upload to the high in the clouds after handling data. The specific acquisition process is as shown in fig. 2, the raspberry pi is started, the data (temperature, humidity, wind speed, wind direction and altitude) of each sensor is initialized, the raspberry pi is connected with the cloud, and the cloud issues an assignment. When receiving a start command issued by the cloud, the data acquisition end starts to acquire data, transmits the data to the raspberry group through the serial port, and updates the recorded data and uploads the encrypted data to the cloud if the transmitted data changes. And when a stop command issued by the cloud is received, the serial port is closed by the raspberry group, and the data acquisition end stops acquiring.
The VR skiing module builds a VR skiing scene based on a Unity3D engine, uses C # script programming to establish connection with a cloud, so as to be linked with the ski field environment element sensing module in real time, associates the acquired real-time information with a 3D model and an object model in the scene, and realizes the dynamism of the VR scene by changing the terrain, sound and sliding resistance of the scene.
The VR skiing module receives environmental elements in a real skiing field in real time and carries out dynamic feedback, and the whole design stage comprises three parts of VR skiing scene establishment, cloud linking and virtual skiing system dynamic feedback.
And in the building of the VR skiing scene, the terrain data and the dynamic environment elements of the real field are restored according to the modeling of the actual skiing field, and the VR virtual scene demonstration is carried out. The virtual skiing scene is based on a Unity3D engine, required model materials are dragged into the scene, the model is placed according to the proportion and the pattern of a real free ski field, necessary ground environment, light source, sky box and sound are added to set off the atmosphere of the scene, script development is carried out through C # language, the virtual reality software environment is built by using Oculus software, Steam VR and VRTK in Steam, and 3D imaging of a virtual skiing system picture is achieved by using Oculus Rift.
This VR skiing scene has realized virtual reality free style skiing and has experienced, gives the skiing experience that the user is personally on the scene, has added the physics engine in the virtual reality scene, and the user can slide in the skiing way with first person entering scene. Experience person can hear the wind sound among the process of sliding, has strengthened the sense of immersing of skiing, can simulate the skiing situation under different environment through the natural environment parameter of revising the scene simultaneously, and frictional resistance, the wind resistance that receives under the process of sliding can corresponding change to influence the speed of sliding of skiing, promoted the authenticity and the application scope of this system greatly.
The link with the cloud is realized by the Unity3D client, namely, the client side, and the cloud side, namely, the server, through the written C # script. After entering a VR skiing scene, establishing connection with a cloud terminal through a script, uploading a 'start' instruction to the cloud terminal, starting data acquisition of the environment element sensing module in the real skiing field, and meanwhile receiving the acquired data from the cloud terminal by the scene. And after the virtual scene exits, uploading a stop instruction to the cloud end, stopping the work of the environment element sensing module, and disconnecting the scene from the server.
In the dynamic feedback of the virtual skiing system, after real skiing field environment element data are transmitted to a VR skiing scene through a cloud, the acquired environment element related data are associated with a static 3D model and an object model, a real-time dynamic model is obtained by changing the terrain, sound and sliding resistance of the VR skiing scene, and actual parameters corresponding to the object model are displayed in real time. The user experiences the change of dynamic environment element through virtual skiing scene, observes through VR equipment and display screen.
The cloud real-time linking module deploys the server at the cloud, so that the ski field environment element sensing module and the VR skiing module which are far away from each other are interconnected and share data through the Internet; the cloud real-time link module is designed by adopting a C/S framework, and meanwhile, the identity authentication and encryption communication are realized by using the SSL certificate, so that the confidentiality and the reliability of data transmission are ensured.
Data transmission adopts SSL certificate to authenticate and encrypt, and virtual skiing system of this embodiment makes an SSL certificate of self-control according to the demand, and the SSL certificate protocol divides into two-layer, includes handshake protocol and record protocol, and the overall process is as shown in fig. 3.
The handshake protocol is used for interacting the client and the server for the first time before the actual dynamic environment element data transmission starts, carrying out identity authentication through a digital certificate, and negotiating the encryption method after the identity is confirmed to be correct. The system of the embodiment adopts two popular encryption algorithms RSA and AES at present, wherein RSA is an asymmetric algorithm, a public key and a private key are required to be paired for encryption and decryption, AES is a symmetric algorithm, only one key is required, the RSA algorithm is high in safety, the AES algorithm is high in encryption and decryption speed, and due to the complexity of RSA, the encryption and decryption speed is low, so that the AES algorithm is used for encrypting original data; if only adopting AES symmetrical algorithm to encrypt and decrypt, the security is not high enough, so the RSA algorithm is used to encrypt the AES, thus the encryption security can be ensured, and the encryption and decryption speed can be ensured at the same time.
The recording protocol is a handshake protocol, and the encryption and transmission of text content are started after the secure communication is established, and the specific process is as follows:
step 1: both the client and the server generate a pair of RSA secret keys, and the client and the server respectively keep the private keys and send the public keys to the other party;
step 2: the server generates a key to be used by AES encryption by using a random function;
and step 3: the server encrypts the data to be transmitted by using the key generated in the previous step by using an AES (advanced encryption Standard);
and 4, step 4: the server encrypts the generated random Key by using the public Key given by the client;
and 5: the server sends the data encrypted by the AES and the random key encrypted by the public key sent by the client to the client together;
step 6: after the client side takes the data sent by the server, the encrypted random key is decrypted by using the private key of the client side, and then the data encrypted by the AES is decrypted by using the random key which is decrypted successfully to obtain the final data.
The specific workflow of the meta-universe skiing system of the embodiment is shown in fig. 4. Firstly, an environmental element sensing module is placed in an actual skiing field, and a raspberry group is started to be connected with a cloud server. The virtual skiing scene is opened through the Unity client, after the scene enters, the Unity client is firstly connected with the cloud server through the C # script, then an instruction for starting data collection is sent, the cloud server forwards the instruction to the raspberry pie, and the raspberry pie starts to collect the environmental element data in the actual skiing field and uploads the environmental element data to the cloud. The Unity client receives the environment elements in real time and associates the environment elements with the virtual scene, and an experiencer experiences the meta-skiing system through VR equipment. When the terminal exits the scene, the Unity client sends an instruction for stopping data acquisition, and the raspberry sends the instruction to receive the instruction through the forwarding of the cloud server and stops the acquisition work of the environment elements.
The testing effect of the meta-universe skiing system with cloud real-time linked ski field environment elements is shown in fig. 5. In the left diagram, A is the geographical position of the Yuan universe ski field, and B is the position of a certain ski field. In the right diagram, A is the element of the Yuanxue ski field and the real ski field environment displayed in real time, and B is the element of sensing a certain ski field environment.
The skiing experience using the meta-universe skiing system of the embodiment is shown in fig. 6. Wherein, the left picture is the scene that this system skier can experience, and 1 in the right picture is VR display view, and 2 is VR head mounted display device, and 3 is the ski.
The invention belongs to the crossing field of mechanical and electronic engineering and sports, and discloses a skiing digital sports system which is established by applying a robot technology, a virtual reality technology, an internet of things technology and an artificial intelligence technology to popular sports of the public, and lays a certain foundation for 'getting ice and snow' of the public.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit of the corresponding technical solutions and scope of the present invention as defined in the appended claims.

Claims (7)

1. The utility model provides a skiing system in meta universe that ski field environment element high in clouds real-time link which characterized in that: the system comprises a ski field environment element sensing module, a VR skiing module and a cloud real-time link module; the ski field environment element sensing module is responsible for sensing environment element changes in a real ski field, receiving cloud instructions and uploading collected data to a cloud; the VR skiing module is responsible for uploading instructions for starting and stopping data acquisition to the cloud, receiving environment element data forwarded by the cloud in real time and carrying out dynamic feedback, and is responsible for displaying data of skiing scenes in real time and rendering the scenes; the cloud real-time link module deploys the server at the cloud end and is responsible for connection and data transmission among all modules, a C/S framework is adopted for design, and meanwhile, identity authentication and encryption communication are achieved through SSL certificates, so that confidentiality and reliability of data transmission are guaranteed.
2. The cloud real-time linked meta-universe skiing system according to claim 1, wherein: the cloud real-time link module enables the ski field environment element sensing module and the VR skiing module which are far away from each other to be interconnected and share data through the internet; the cloud real-time link module adopts SSL certificate for data transmission to carry out authentication and encryption, and SSL certificate protocol is divided into two layers, including handshake protocol and recording protocol;
the handshake protocol is used for interacting the client and the server for the first time before the actual dynamic environment element data transmission starts, carrying out identity authentication through a digital certificate, and negotiating an encryption method after the identity is confirmed to be correct; adopting two encryption algorithms of RSA and AES, encrypting original data by the AES algorithm, and encrypting the AES by the RSA algorithm; the recording protocol is a handshake protocol, which establishes secure communication before the text content is encrypted and transmitted.
3. The cloud real-time linked meta-universe skiing system according to claim 2, wherein: the specific process of the recording protocol is as follows:
step 1: both the server and the client generate a pair of RSA secret keys, each of which has well-managed private key and sends the public key to the other party;
step 2: the server generates a key to be used by AES encryption by using a random function;
and step 3: the server encrypts the data to be transmitted by using the key generated in the previous step by using an AES (advanced encryption Standard);
and 4, step 4: the server encrypts the generated random Key by using the public Key given by the client;
and 5: the server sends the data encrypted by the AES and the random key encrypted by the public key sent by the client to the client together;
step 6: after the client side takes the data sent by the server, the encrypted random key is decrypted by using the private key of the client side, and then the data encrypted by the AES is decrypted by using the random key which is decrypted successfully to obtain the final data.
4. The cloud real-time linked meta-universe skiing system according to claim 3, wherein: the ski field environment element sensing module comprises a data acquisition end, a data receiving end and a 5G wireless network card; the data acquisition end acquires data of each sensor in the ski field, the data receiving end receives the acquired data and judges the data, and if the data are changed, the 5G wireless network card is used for uploading the processed data to the cloud.
5. The cloud real-time linked meta-universe skiing system according to claim 4, wherein: the data of each sensor of the ski field comprises temperature, humidity, wind speed, wind direction and altitude, wherein the temperature, the humidity, the wind speed and the wind direction are directly measured by using the corresponding sensor of the ski field, and the altitude is indirectly obtained by a barometer;
the data acquisition end comprises an Arduino mainboard and a sensor module, the sensor module comprises a wind speed sensor module, a wind direction sensor module, a temperature and humidity sensor module and a barometer, the sensor module connects each analog voltage acquired by the sensor module to an analog input port of the Arduino mainboard, and the Arduino mainboard obtains a corresponding data value after voltage conversion;
the data receiving terminal uses the raspberry group, carries out serial communication with the Arduino mainboard, uses USB to change the TTL data line simultaneously and obtains the barometer data, through opening and closing of control serial ports realize data acquisition's beginning and stop, the raspberry group receives behind the data and judges data, if data change, uses 5G wireless network card to upload to the high in the clouds after handling data.
6. The cloud real-time linked meta-universe skiing system according to claim 5, wherein: the VR skiing module builds a VR skiing scene based on a Unity3D engine, uses C # script programming to establish connection with a cloud, so as to be linked with the ski field environment element sensing module in real time, associates the acquired real-time information with a 3D model and an object model in the scene, and realizes the dynamism of the VR scene by changing the terrain, sound and sliding resistance of the scene.
7. The cloud real-time linked metas-skiing system according to claim 6, wherein: the whole design stage of the VR skiing module comprises three parts, namely the establishment of a VR skiing scene, the linkage with a cloud end and the dynamic feedback of a virtual skiing system;
during the establishment of the VR skiing scene, the terrain data and the dynamic environment elements of the real field are restored according to the modeling of the actual skiing field, and the VR virtual scene demonstration is carried out; the virtual skiing scene is based on a Unity3D engine, required model materials are dragged into the scene, the model is placed according to the proportion and the pattern of a real free ski field, necessary ground environment, light source, sky box and sound are added to bake the atmosphere of the scene, script development is carried out through C # language, the virtual reality software environment is built by using Oculus software and Steam VR and VRTK in Steam, and 3D imaging of a virtual skiing system picture is realized by using Oculus Rift;
the link with the cloud end means that the Unity3D client end transmits data with the cloud end, namely a server, through a compiled C # script;
in the dynamic feedback of the virtual skiing system, after the real skiing field environment element data is transmitted to the VR skiing scene through the cloud, the acquired environment element related data is associated with the static 3D model and the object model, a real-time dynamic model is obtained by changing the terrain, sound and sliding resistance of the VR skiing scene, and actual parameters corresponding to the object model are displayed in real time; the user experiences the change of dynamic environment element through virtual skiing scene, observes through VR equipment and display screen.
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