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对终端区域 4 D导航中高度剖面和速度剖面生成的基本算法进行了研究。结合已经开发的水平轨迹计算方法 ,生成终端区域的 3 D飞行剖面和速度剖面 ,然后产生 4 D导航指令 ,利用已生成的 4 D导航指令可在终端区域引导沿直线或曲线飞行的飞机在规定的时间到达指定地点 ,从而实现终端区域的 4 D导引。最后对某民航运输飞机进行了数值模拟 ,由计算结果可看出风对 4 D导航的速度剖面有较大的影响 ,结果还表明该方法计算量小 ,只需输入少量的参数就能生成 4 D导引指令
The basic algorithms for the generation of 4-D navigation mid-altitude and velocity profiles in the terminal area are studied. In combination with the developed horizontal trajectory calculation method, 3 D flight and velocity profiles of the terminal area are generated and then 4 D navigation commands are generated. Using the generated 4 D navigation commands, an aircraft that follows a straight line or a curve flight in a terminal area can be guided Of the time to reach the designated location, in order to achieve the terminal area 4 D guidance. Finally, a numerical simulation of a civil aircraft is carried out. It can be seen from the calculation results that the wind has a great influence on the velocity profile of the 4-D navigation. The results also show that this method requires less computation and can generate 4 D guidance instruction