The more difficult second level requires a flight of 180 seconds followed by a landing on simulated lunar terrain, complete with rocks and craters.
更困难的第二个级别，要求飞行180秒，接着在遍布岩石和陨石坑的模拟月球地形上降落。
This method can be applied to terrain correction point by point for the airborne gamma energy spectrum in cases of any flight ways and arbitrary topographic conditions.
该方法特点是适合于任意飞行方式(缓地形和水平飞行均可)和任意地形条件航空伽玛能谱的逐点地形改正。
The serious incident is officially classified in international aviation terms as "controlled flight into terrain only marginally avoided".
国际航空术语把这种严重事件正式归类为“控制中的飞机进入只能险险避开的地带”。
A nonlinear PD controller is presented in this paper and is used in the design of the control laws for an automatic terrain following flight control system.
提出了一种非线性PD控制方法，并将其应用在自动地形跟随系统飞行控制律的设计中。
Recently, terrain walkthrough has been widely used in computer games, VR, flight simulations, military mission planning and GIS etc.
近年来，地形漫游已经广泛应用于电子游戏、虚拟现实、飞行模拟、军事演习以及GIS等各个应用和研究领域。
Based on existent conditions of flight control system and avionic system for an aircraft. The paper presents three schemes of automatic terrain anti-collision according to the radar operating way.
本文立足于某飞机飞行控制系统和航空电子系统的现有条件，依据雷达天线的工作方式，提出了三种自动地形防撞的原理方案。
Experiment shows this method improves the in snow simulation, keeps real-time, and ADAPTS to the large-scale terrain, especially for the scene with flight simulation.
实验表明，降雪积雪模拟方法模拟效果真实，实时性良好，适合大场景尤其是飞行模拟系统中。
The results show that the main causes are human error by crew and environment factors resulted in loss of control and controlled-flight-into-terrain with terrible fire causing severe casualty.
结果表明：事故的主要原因是人为因素和环境因素，事故结果主要为飞机失去控制和可控飞行撞地的结果，飞机撞地后起火往往造成机组人员和乘客大量伤亡；
The results show that the main causes are human error by crew and environment factors resulted in loss of control and controlled-flight-into-terrain with terrible fire causing severe casualty.
结果表明：事故的主要原因是人为因素和环境因素，事故结果主要为飞机失去控制和可控飞行撞地的结果，飞机撞地后起火往往造成机组人员和乘客大量伤亡；
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