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Raystar 112 Manual

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2 RAYSTAR 112 Installation and Operation Handbook
that at any time a minimum of 6 satellites will be in view to users
anywhere in the world. The satellites continuously broadcast position
and time data to users throughout the world.
The Control Segment, consists of a master control station in Colorado
Springs, with five monitor stations and three ground antennas located
throughout the world. The monitor stations track all GPS satellites in
view and collect ranging information from the satellite broadcasts. The
monitor stations send the information they collect from each of the
satellites back to the master control station, which computes extremely
precise satellite orbits. The information is then formatted into updated
navigation messages for each satellite. The updated information is
transmitted to each satellite via the ground antennas, which also
transmit and receive satellite control and monitoring signals.
The User Segment consists of the receivers, processors, and antennas
that allow land, sea, or airborne operators to receive the GPS satellite
broadcasts and compute their precise position, velocity and time.
The satellites continuously broadcast their navigation messages at a
frequency of 1575.42 Mhz (for civilian use). Superimposed on the
navigation message is a high rate coarse acquisition (C/A) code used
for precise positioning measurements and positive satellite
identification. The C/A ID code permits the user to identify particular
satellites and, in some cases, to determine and select the “best
satellites” to use in position calculations.
If it were possible to measure true satellite ranges directly, it would only
be necessary to track data from any two satellites to obtain a vessel’s
latitude/longitude. In actual practice, for marine navigation, the receiver
must lock onto and track a minimum of three satellites in order to resolve
timing errors, including the receiver’s own internal clock timing bias error
which must be factored into the various range calculations.
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