Symmetricom TimeSource 3100, User Manual

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TimeSource 3100
Engineering and Ordering
097-72020-01 Issue 9: November 2003
Antenna Location Guidelines
The ideal antenna location provides a clear, unobstructed view of the sky from the zenith to
the horizon line, and 360 degrees around the horizon.
A compromise often must be made between location and satellite field of view. The smaller
the field of view, the fewer satellites that can be used in the timing solution for GPS derived
time.
Signals closer to the horizon are often subject to multipath effects, which degrade the timing
solution. The TimeSource 3100 can be set to ignore, or mask, all signals from the horizon to
a chosen angle of elevation (mask angle). (See Figure 6.)
Figure 6. Antenna Field of View
Horizon
Antenna position
10°
Equator
10°
Mask angle*
Mask angle*
Pole
Obstructions
Antenna
if possible
toward the pole
field of view
* An angle of 10° masks objects up to about 1 m above the
horizon at 6 m from the antenna (illustration at right.)
10°
1 m
6 m