机载FMS航路管理磁航向角计算方法研究及SCADE建模实现

Research on Magnetic Heading Angle Calculating Algorithm and Realized by SACDE

飞机从一个航路点向下一个航路点飞行时,需要准确知道飞机的应飞磁航向角。由于地球是一个复杂的椭球体,飞机在飞行时,正北方向在逐渐变化,加上磁差的影响需要不断地对应飞航向角进行实时修正准确计算,才能准确到达下一个航路点。通过对磁航向角计算原理方法进行了深入研究,考虑到地球不同位置地球半径不同影响、磁差的影响,改进了磁航向角计算方法。利用基于模型开发的SCADE Suite对算法进行了算法建模与仿真,结合杰普逊航图上航路实际数据,分别在中国、美国进行了实际仿真验证,并与传统计算方法结果进行了对比。结果表明:提出的磁航向角计算方法能够更精确计算飞机的应飞航向角,相比传统方法计算精度进一步提高。

When the aircraft is flying from one waypoint to the next,it needs to know exactly the flight magnetic heading angle of the aircraft.Since the earth is a complex ellipsoid,when the aircraft is flying,the north direction is constantly changing,and the influence of the magnetic difference needs to be accurately corrected in real time corresponding to the flight angle to accurately reach the next waypoint.In this paper,the principle method of magnetic heading angle calcution is deeply studied.The calculaton method of magnetic heading angle is improved considering the ingluence of different earth positions and different earth radii and magneti difference.After the algorithm derivation is completed,the algorithm is modeled and simulated by SCADE Suite based on model development.The actual data of the route on Jeppesen aeronautical map isverified in China,the United States,and the results of traditions calculation methods are used contrast.The results show that the proposed magnetic heading angle calculation method can calculate the flight angle of the aircraft more accurately,and the calculation accuracy is further improved compared with the tradition method.