Interplanetary Systems
Interplanetary-radio communication system not only communicate with spacecraft, but are also used to determine their position. This can be done either using a transponder on-board a spacecraft that echoes a radio signal back, or using radar. Orientation information can be obtained using star trackers.
Read more about this topic: Positioning System
Famous quotes containing the word systems:
“Our little systems have their day;
They have their day and cease to be:
They are but broken lights of thee,
And thou, O Lord, art more than they.”
—Alfred Tennyson (1809–1892)
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