考虑地球扁率的RNAV航路规划

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。

RNAV route planning with regard to earth ellipticity

In order to improve the precision of flight track guidance and provide shorter route,the coordinates of waypoints,initial TC and distance of each leg should be calculated with regard to earth Ellipticity.The formulas of calculating the initial TC and distance of a route and the latitude of waypoints are derived through spatial vector analyses with IAG-75 ellipsoid parameters.The research shows that the distance of the B215 route from FUKANG to DAWANGZHUANG is 2,642 km,the distance of the great circle is 2,423.8 km,but the precise distance of the great ellipse is 2,435.3 km.