Design And Implementation Of Embedded Controller And Control Software Of 3D Digital Sandbox System

For the past few years,a completely new method which is based on entity sandbox for 3D display has become the main emphasis of our research.The system of 3D digital sandbox introduced in this thesis combined the remote sensing data and the digital entity sandbox,and moved the remote sensing data from plane to real space,providing a brand-new method to display information.The 3D digital sandbox system included two parts.One is embedded control board in terminal,and the other is desktop control App in PC.In order to control the mechanical device,software and hardware were designed and complemented.Among them,since the errors of hardware of mechanical model lead to abnormality of interruption,a set of scheme that modifying the hardware error in the point view of software and filtering interrupt request signals was proposed.The data protection scheme provided correct data for module recovery,when meeting power failure.Beyond that,in order to handle and transmit the remote sense data,desktop App based on GDAL library and serial port was designed to handle and display data,offer pick tool for users and achieve the picked areas.The target data satisfied data style of terminal were sampled,projected and transformed by GDAL,and would transmit to all terminals.It is called fault point,when standard unit of the terminal has failure.Analysis for fault points with cluster algorithm can help to identify the main cause of the terminal failure.According to the strong distance constraint,the traditional fuzzy clustering algorithm is improved to two kinds of methods: adjustment method based on iteration with feedback and clustering method based on the distance strong constraint.The results show that the using of the terminal error modify scheme reduced the error probability of the mechanical device from the 47.5% to 0.5%.The terminal of system would be recovered correctly when it powered off.It also shows that mechanical device could decrease step angles error to 0.47% that conforms industrial error criteria.