Ag Leader GPS 1500 Operators Manual - Manual (Page 3)

O
VERVIEW
I
NTRODUCTION
The GPS 1500 is a smart antenna that tracks GPS and SBAS (WAAS and EGNOS) signals.
C
ABLE
C
ONNECTIONS
DISPLAY
GPS O
VERVIEW
The receiver is preconfigured and will work out of the box for most applications. When powered for the
first time, the reciever will perform a “cold start,” which involves acquiring the available GPS satellites in
view and the SBAS differential service.
GPS O
PERATION
The GPS engine is always operating, regardless of the DGPS mode of operation. The GPS engine
automatically searches for GPS satellites, acquires the signals, and manages the navigation information
required for positioning and tracking.
Receiver Performance
The receiver finds four or more GPS satellites in the visible sky and uses the information provided by
those satellites to compute an appropriate position (typically within 2-3 meters). Since there is some
error in the GPS data calculations, the reciever also tracks a differential correction. It uses these
corrections to improve its position to less than 1 meter (3 feet)
There are two main aspects of receiver performance:
• Positioning
• Satellite acquisition quality
Satellites transmit coded information to the reciever in a specific frequency that allows the receiver to
calculate a distance to each satellite. GPS is essentially a timing system. The distance is calculated by
timing how long it takes the signal to go from the satellite to reciever.
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