Research On The Algorithm Of Three-Dimensional Protection Area Automatic Generation For Baro-VNAV

With the rapid development of civil aviation in our country, Performance BasedNavigation (PBN) which is a new important technology arises at this historic moment.APV approach can be carried out by APV Baro-VNAV procedure though the horizontaland vertical guide which is provided by airborne ABAS autonomous receiver withintegrity monitoring capacity and Baro-VNAV. Such an approach will become the mainapproach method under the PBN programs, and it is often encountered by the proceduredepartments of civil aviation when designing the PBN final approach procedure.Baro-VNAV procedure belongs to final approach phase of PBN that has more obstaclesto assess, so that the required accuracy will be higher. The evaluation result not onlydetermines the operational standards of PBN approach, but also an important referencefor calculating parameters like visibility. It needs to consider the temperature correctionand establish APV–OAS before assessment, so the evaluation process is complicated.Currently, the implemention of using CAD to draw the protected area and rely onartificial methods to assess the obstacles is inefficient, and the precision can hard tomeet the standard. To solve the problems, depend on the platform of “three-dimensionaldesign system for instrument flight procedure”, the research on the algorithm for theautomatic generation of Baro-VNAV procedure which based on ArcGIS wasaccomplished in this paper.According to the provisions of Doc8168which was publiched by ICAO, thefollowing aspects were studied in this project: By analyzing the influence oftemperature on the implementation of vertical air navigation, the algorithms oftemperature correction and utilization were detail elaborated, and the automaticgeneration function of APV-OAS was realized. The generated protection area could beimport to CAD directly, and seamless connection between ArcGIS and CAD could alsobe achieved; an accurate and FASt obstacle automate assessment algotithm wasproposed, and the automatic management idea of geographic data (the automatic importof the DEM terrain data and the obstacle point, the automatic generation of runway andstation) was introduced. The evaluation results could be export to excel automatically; The automatic generation of3D protection area of PBN final approach was completed,In order to enhance visual effect, it needed to exaggerate the protection area vertically,and the relative space position between the terrain and the obstacles mustn’t be changed;The results were summarized, the problems were analyzed and the research directionwas made clear.