Trimble Outdoors AgGPS 332 - Manual (Page 28)

2 Overview
1 8 AgGPS 332 GPS Receiver User Guide
• Sky wave interference with ground wave
During darkness, when the beacon tower is more than 240–
480 kilometers (150–300 miles) from the receiver, the sky wave
beacon signal may be reflected off the ionosphere. This causes
interference with the ground wave beacon signal. Self-jamming
at night may be a problem with stronger beacon stations.
• Geographic de-correlation
This phenomenon causes radiobeacon signal accuracy to
decrease as the distance between the beacon tower and the base
station increases. Ionospheric conditions can affect accuracy by
as much as 1 meter (3 feet) for every 100 km (60 miles).