Satellite system in GNSS
· Gps by USA
· Glonass by Russia
· Galileo by Europe
· Compass by china
GNSS characteristics
· One-way system, satellite transmit signal without knowing the users. Users are passive, hence anybody can use the system freely.
· GNSS is multi-satellite system, several satellites are visible at all time from the whole globe
· GNSS support several mode of positioning for many users at one time, ranging from decameters to meters to submeter accuracy.
· GNSS is also used for precise time determination.
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