Actis 7 Instrukcja Użytkownika Pobierz pdf (Strona 31)

4. Common Knowledge on GPS



What is GPS?

GPS(Global Positioning System) is a system to provide services such as

position, speed and time measurement using satellite that was developed by

U.S. Department of Defense. There are 24 satellites available currently as a

standard.

[24 satellites available]

GPS can perform accurate measurement of three dimensional position, altitude

and time. It can provide service continuously for 24 hours, is strong against

weather conditions, interference and obstruction, and has a feature to use

global common coordinate system.

To know an exact position you can use a GPS receiver, and receive a signal

simultaneously from at least 4 satellites.

GPS satellite C, Distance C, Positioning point

Intersection point of 3 sections, Principle of GPS positioning

GPS is accompanied with about 5m~15m error even though SA does not

activate during single positioning(absolute positioning, 1 point positioning)

GPS Satellite C

GPS Satellite A

Measuring point (Intersection point

of 3 sections)

[How to measure position via GPS]

Distance A

Distance B

Distance C

GPS Satellite B

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Actis 7 Instrukcja Użytkownika Strona 31