If it makes it, it will join two rovers and two orbiters belonging to NASA and a European satellite already exploring Mars. 如果获得成功,这颗卫星将加入已经在探索火星的美国国家航空及太空总署(NASA)的两辆火星车和两颗卫星及一颗欧洲卫星的行列。
NASA plans two more missions, one each for the remaining two orbiters, Endeavor and Atlantis, before the Shuttle program ends later this year. 国家航空和宇宙航行局计划两个任务,分别为剩馀的两个轨道航行器、勇气和亚特兰提斯岛,在航天飞机计划结束今年晚些时候。
View of Valles Marineris, using wide-angle imagery from NASA's Viking orbiters and the Mars Orbiter Camera. 查看水手谷,利用美国宇航局的海盗号轨道器和火星轨道器照相机广角图像。
Operations of Chang'e-2 are in the second stage of the Chinese moon-landing project, which focuses on collecting information for future orbiters to land on the moon. 嫦娥二号的运行属于中国探月工程二期,它主要为未来的卫星登月收集资料。
Orbiters, landers and rovers have all been used to explore Mars. 轨道器、登陆器和探测器都是用于火星探索的。
The two Viking orbiters made maps of much of the surface. 两个海盗号轨道飞行器绘制出了火星大部分表面的地图。
Radar sets in patrol planes enabled the British and American navies to bring the German submarines under control. The two Viking orbiters made maps of much of the surface. 安装在巡逻飞机上的雷达设备,使英、美海军得以制服德国潜艇。两个海盗号轨道飞行器绘制出了火星大部分表面的地图。
The Viking orbiters found that much of the southern part of Mars is full of old holes, or craters. 海盗号轨道飞行器发现,火星南部的大部分地区布满了古老的洞穴或环形山。
The Viking spacecraft consisted of two orbiters. 维京太空船由两个轨道航行器组成。
Kinematic Orbit Determination of Low-Earth Orbiters Based on GPS Precise Point Positioning Technique 基于GPS精密单点定位的低轨卫星几何法定轨
A Study of Relative Orbit Determination for Low Earth Orbiters Based on Dual Frequency P Codes of Onboard GPS Receiver 基于双频P码的星载GPS低轨卫星相对定轨研究
For low-earth orbiters ( LEO), atmospheric drag is the main error source in orbit determination. 对低轨卫星(LEO),大气阻尼摄动是主要的定轨误差源。
Compared with differencing model, the method of precise orbit determination of low earth orbiters with GPS point positioning have a few advantages, such as no using of terrain receivers, small amount of work. It has a good foreground in precise orbit determination. 非差GPS定位与差分方法相比具有不需要地面站、能直接得到测站坐标、工作量小、效率高等优点,因此精密单点定位在低轨卫星的定轨方面具有良好的应用前景。