oa Civil Engineering = Siviele Ingenieurswese - The geodesy of GPS - what every civil engineer should know
GPS is now widely used by civil engineers for surveying, setting out and monitoring, but it still requires a basic grounding in geometric geodesy The global positioning system (GPS) is a navigation and positioning system operated by the US military from Falcon Air Force Base near Denver, Colorado. It currently consists of 25 satellites that are tracked continuously, their predicted positions being transmitted on a radio signal with additional measuring codes to GPS user receivers on or near to the earth's surface. At any time, at least four of these satellites should be 'visible' above the observer's horizon.
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