Study On The Cross-boundary Warning System Of Soil Preparation Based On BDS

When a tractor drives out of a predetermined operation area or other operation areas in the course of land preparation,it may cause a major accident or damage crops in other areas,which is not allowed in the course of land preparation.The early-warning system of tractor land preparation proposed in this paper,fully consider the overstepping of the tractor in the process of land preparation.According to the analysis of system functional requirements,the demonstration and design of the basic functional system are completed.At the same time,by taking the cross-border early warning model as the framework,the overall structure of the early warning system was set up and adjusted,and field cross-border early warning test was carried out.The main research contents and conclusions are summarized as follows:(1)This paper puts forward the concept of cross-boundary early warning and the basic idea of early warning,the process of overstepping algorithms and equipment development in different fields at home and abroad is analyzed.On this basis,the deficiencies in the research are summarized.In this way,the corresponding method and technical route of early warning system research are determined,the corresponding early warning model is established;(2)Through the analysis of system functional requirements,the research on the early warning system based on the BDS navigation and positioning system is determined.According to the BDS and Angle sensor,the acquisition of tractor positioning information,the measurement of vehicle speed and the acquisition of wheel Angle are realized.Through the acquisition of these basic data,the framework of the cross-boundary warning model system is established.LabVIEW graphical programming language is used to compile the cross-border warning system,and the three-level warning system is designed according to relevant parameters.By controlling the steering of the tractor,the function of avoiding the boundary is realized,and the reliability and safety of the warning system are further improved;(3)In the overall design of the early warning system,the structure design concept of the upper and lower levels is adopted.The four basic systems corresponding to the basic functions are taken as the underlying program of the early warning system.The basic functions of the early warning system are composed by vehicle positioning,speedmeasurement,corner acquisition and steering control.Meanwhile,the out-of-bounds model is used as the frame,the data interaction built on the attribute node as the bridge.The out-of-bounds warning model as the frame to obtain the out-of-bounds parameters of the tractor in the process of land preparation in real time;(4)In order to further improve the practicability of the early warning system and simplify the use process of the early warning system,a parameter configuration module is designed.The user can use the Google map to set the boundary of the operation area independently according to the specific requirements.Input the corresponding operation width according to the model of the practical rotary tiller.After the debugging of the early warning system,the John Deere 1204 tractor was used as the test platform to carry out outdoor tests of different sub-functions and the early warning system.According to the test results.The overcrossing warning system has a good ability to distinguish and warn the warning models of vehicle front,vehicle side and arbitrary boundary.Its basic functions can be realized.The experimental data show that the control distance deviation of the front and side boundary of the vehicle is 1.21 cm and 0.97 cm respectively.