The flight phase: As an athlete moves through the air, his leg swings backward and then moves rapidly forward.
腾空阶段：当运动员在空中移动之时，他的腿先向后摆动，然后迅速向前移动。
So, the action of extending the leg backward creates a forward and upward movement (the flight phase).
因此，腿向后伸展的作用力，产生一个向前向上的运动(腾空阶段)。
This research built a flight phase safety risk assessment model basing on Back Propagation(BP) neural network.
基于反向传播（BP）神经网络，建立了民用航空航段安全风险评估模型。
Based on the virtual target point and the ellipse trajectory theory, a new maneuver method in the free - flight phase is presented.
基于虚拟目标点和椭圆弹道理论，提出了一种在自由段机动变轨的新方法。
Then, the storage phase, standby phase, captive flight phase and free flight phase of the typical life profile of air-to-air missile are emphatically expounded.
之后对空空导弹典型寿命剖面中的贮存阶段、待命阶段、挂飞阶段、自主飞行阶段进行了重点阐述。
By using the line of sight (LOS) measurements from space based infrared sensors, free flight phase trajectory estimation problem of ballistic missile is studied.
主要研究空间预警系统利用星载红外传感器的视线测量估计弹道导弹自由飞行段弹道的问题。
Base on BP Neural Network, this research has built a flight Phase safety Risk Assessment model.
本文基于BP神经网络，建立了民用航空航段安全风险评估模型。
Base on BP Neural Network, this research has built a flight Phase safety Risk Assessment model.
本文基于BP神经网络，建立了民用航空航段安全风险评估模型。
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