Positioning system

Positioning System

Positioning system

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Description:
A positioning system is a mechanism for determining the location of an object in space. Technologies for this task exist ranging from worldwide coverage with meter accuracy to workspace coverage with sub-millimetre accuracy.

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.

Global systems

Global navigation satellite systems (GNSS) allow specialized radio receivers to determine their 3-D space position, as well as time, with an accuracy of 2–20 metres or tens of nanoseconds. Currently deployed systems use microwave signals that can only be received reliably outdoors and that cover most of Earth's surface, as well as near-Earth space.

The existing and planned systems are:



Regional systems

Networks of land-based positioning transmitter allow specialized radio receivers to determine their 2-D position on the surface of the Earth. They are generally less accurate than GNSS...
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