Antenna Field Of View - Symmetricom TimeSource 3600 Manual

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Figure 8. Antenna Field of View
Antenna position
Antenna
field of view
10°
Mask angle*
Horizon
Equator
* An angle of 10° masks objects up to about 1 m above the
horizon at 6 m from the antenna (illustration at right.)
Due to the geometry of the GPS satellite orbits, more satellites are
visible in the direction of the equator than the poles. If possible, place
the antenna so that the antenna has a clear view toward the equator
(toward the south in the northern hemisphere, or toward the north in
the southern hemisphere). Up to 60 degrees of arc, centered at the
pole, may be blocked with little effect in the temperate latitudes. This
note is less applicable in latitudes nearer the equator.
The total of obstructions above the mask angle should not obscure
more than 25 percent of the total field of view (90 degrees of
azimuth) (Figure 9).
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Engineering & Ordering
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Obstructions
toward the pole
if possible
10°
Mask angle*
Pole
10°
1 m
6 m
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