DME／DME定位算法研究及SCADE建模实现  

Research for the DME/DME Location Algorithm and Realized by SCADE

作　　者：王亮亮 田莉蓉[1] 刘文学[1] 缪伟涛 WANG Liang-liang;TIAN Li-rong;LIU Wen-xue;MIAO Wei-tao(Xi＇an Aeronautics Computing Technique Research Institute, AVIC, Xi＇an 710068, China)

机构地区：[1]航空工业西安航空计算技术研究所,西安710068

出　　处：《航空电子技术》2018年第A01期102-107,共6页Avionics Technology

摘　　要：地球是一个复杂球体，为了提高DME／DME定位精度，首先将地球半径进行实时计算；其次将导航数据库提供的DME经纬度坐标转换到地心坐标系下的单位矢量，之后再利用向量运算计算出来飞机所处位置矢量，再将矢量转换回经纬度坐标；最后将DME导航台测量的斜距转换为大圆航线距离。算法推导完成之后，利用基于模型开发工具SCADE进行算法建模实现，并结合杰普逊航图真实数据对算法分别在中国，美国进行实际仿真实验，并与传统方法进行了对比。实验结果表明，改进后的定位算法能够实现飞机的精确定位，相比传统方法进一步提高了定位精度，并满足DME／DME导航性能RNP2性能要求。The earth is a complex sphere, so in order to improve the location accuracy of DME/DME algorithm： first, the radius of the earth was calculated in real-time ; second, DME coordinates of latitude and longitude from the navigation database are converted to the unit vector from geocentric coordinate system. Then the plane＇s location is calculated with vector operation which is converted to the coordinates of latitude and longitude in the end; Third, the slant distance measured by DME Navigation Station is converted to the distance in the circle route. SCADE is used to implement the DME/DME algorithm. After that the algorithm have been deduced, simulation is carried out in China and US which is combined with Jeppesen charts .The results show that the DME algorithm can implement precise localization of plane and meet DME/DME navigation performance of RNP2 requirements.

关 键 词：DME/DME定位算法 地心坐标系 SCADE建模 杰普逊航图 

分 类 号：TP311.52[自动化与计算机技术—计算机软件与理论]