Design And Implementation Of Agricultural Vehicle Remote Monitoring Center Based On Virtual Reality

The harsh environment and the heavy task of operation result in the massive labor transfer in the process of agricultural production. Human perception and operation ability could be expanded by remote operation system, which will liberate human beings from working in dangerous and hostile environment. In the development of remote operation system, the dead angle is easy to appear in the work process because of the large amount of vedio equipment information and the narrow field of vision. At the same time the limitation of signal transmission technology may lead to problems such as delaying and signal lost in teleoperation systems. The rising of virtual reality technology provides a good auxiliary function for remote operation system. By using the technology of virtual reality, a virtual environment, similar to the job site, can be built in the remote monitoring center and provides visual and force feedback for the operator, which is helpful for the operator to grasp the job site information and improve the efficiency of remote operation.The design and implementation of agricultural vehicle remote monitoring center, which are based on virtual reality, are realized in this paper, this lays the foundation for the next step of remote operation. The main subject of the object is virtual farmland scene modeling, human-computer interaction and the realization of communication. Visual C++6.0and OpenGL are used as development platform. Several key issues in the process of system achievement are discussed and analysed. The completed work is described as follows:(1) Virtual farmland scene is constructed. OpenGL and3DS MAX are used in the modeling of three-dimensional. Stereoscopic skybox is used to generate sky; the real terrain is simulated based on the digital elevation model(DEM); field crops are modeled based on the Billboard method; complex bodywork is modeled by using3DS.MAX modeling software, and the model is derived to3DS file format, the read and display of the3DS model file is researched based on OpenGL; in the simulation of natural phenomena of the scene, rain and snow effect simulation based on particle system and fog effect simulation based on OpenGL are realized, a lifelike virtual farmland environment is provided for the operator.(2) In order to realize the control of vehicle of the virtual formland scene, the keyboard and joystick are used to realize the interactive control in the remote monitoring center, DirectInput component of DirectX is used to achieve the interaction function of the joystick and the vehicle of virtual scene by programing. Axially bligned bounding box, sphere, oriented bounding box and discrete orientation polytopes four bounding box collision detection technology are analyzed and compared, and the axially bligned bounding box is used to realize the collision detection of virtual farmland scene, the scene of realism and immersive is enhanced.(3) The communication system is designed. In the WAN environment, vehicle communications platform is built based on connection-oriented TCP/IP and Socket communication mechanism of client/server model, in order to realize the issued of control command and the upload of feedback information. At the same time in order to prevent the occurrence of an emergency, video surveillance unit is introduced to work-site remote monitoring, and the safety of operation is improved.Virtual reality technology is used to build a lifelike virtual farmland scene in the remote monitoring center, the operator can use the keyboard or joystick to interactive control the vehile of virtual scene, remote monitoring center can communicates data with the executive end of agricultural vehile through3G network, real-time bidirectional transmission of data is achieved through communication test, the requirements of real-time transmission and communication are satisfied, the premise condition of the remote operation is realized.