Research And Realization Of Precise Algorithm In Turning Protection Area

With the implementation of the 13 th five-year plan,China's civil aviation industry is developing rapidly,Airspace flow is increasing while airspace load is also increasing,Therefore,higher and stricter requirements are put forward for the safe operation of aircraft,Flight procedure is an significant part of airspace planning,Requirements for efficiency and accuracy in flight procedure is also increasing,Although there are a lot of computer-aided design of flight procedure,However,the precise algorithm of turning protection zone is still relatively deficient,Causes when automation is implemented,there are still problems.Firstly,this study is based on DOC8168,based on the characteristics of traditional and PBN turning program protection zone design,The key problem of accurate drawing of turning protection area is studied,For the turning part of the protection area,the connection between the wind spiral,By introducing different algorithms for comparative study,Choose the optimal convex hull algorithm,For accuracy,On the basis of convex hull,Cubic b-spline interpolation was used to fit the boundary of the protected area,For connection of wind spiral and non-wind spiral The arc length parameterization is carried out by using the transverse and longitudinal coordinates of wind spiral fitting point,and then calculate the tangents of the differential equations,Then the approximate tangent equation is calculated.In terms of algorithm implementation.Secondly,The use of digital image realized data visualization and rendering,and draw images of protected areas automatically.To be more practical,This paper combines the advantages of Lab view and MATLAB to Data fusion hybrid programming,Generate Auto Cad recognizable scripts,Achieve the purpose of automatic drawing in Auto Cad.Finally,this paper chooses a Holding program which involves more wind spirals in the turning protection area to verify the proposed algorithm.The results show that the turning protection area can be accurately plotted in the programming.