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考虑地球扁率的影响,在地理坐标系下推算区域导航(RNAV)航路点的经纬度坐标以及各航段的初始真航线角(TC)与航线距离,为机载区域导航设备提供更为精确的航迹指引和更为快捷的直飞航线。以IAG-75椭球参数为计算依据,根据空间向量分析,导出了RNAV大椭圆圈航线的初始TC、航线距离以及基于中间插值的航路点纬度计算方法。经计算,从B215航路的阜康至大王庄,现行等角航线距离为2642km,简化大圆航线模型的航线距离为2423.8km,而考虑地球扁率影响的大椭圆航线模型的航线距离为2435.3km。
Taking into account the influence of the earth's flattening rate, the latitude and longitude coordinates of the RNAV route waypoint and the initial true flight angle (TC) and route distance of each flight segment are calculated under the geographic coordinate system to provide a more accurate Track guidance and faster direct flights. According to IAG-75 ellipsoid parameter, based on space vector analysis, the initial TC, route distance of RNAV large oval circle route and the method of calculating the waypoint latitude based on intermediate interpolation are derived. Calculating from the Fukang to Daowangzhuang of B215 route, the current distance of the equatorial route is 2642km, the route distance of simplified circular route model is 2423.8km, and that of the large elliptical route model considering the influence of the earth's oblate rate is 2435.3km.