The satellite USES radar to measure its altitude above the ice sheet.
卫星用雷达测定卫星从冰层顶部算起的高度。
2
Further advised that the object found resembles a high altitude weather balloon with a radar reflector.
这个物体像是一个带有雷达反射器的高空气象气球。
3
We go through pre-mission planning, and if we're trying to evade something, you can put up receivers, and you understand at what altitude that radar is going to be effective.