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Operations
Satellites In Use
The next sub-page indicates the satellites that are presently being used
to calculate your position. The selection of these satellites is a complex
process that minimizes the error in calculating your position. The GPS
satellites are always moving across the sky, so the ideal selection of
satellites is constantly changing. The NMS GPS tracks up to 8
satellites simultaneously to insure fast and accurate transitions as these
satellites move.
Satellite Status
The display below shows the status, elevation, SNR, and Azimuth for
each satellite. A similar display appears for each satellite a GPS sensor
is tracking. In this example, satellite SV24 is in search status, with an
elevation of 56°, an SNR of 38, and an azimuth of 173
describes the position (in degrees) above the horizon. Azimuth refers
to the horizontal position of the satellite in degrees, measured from
true north.
The SNR measurement is a relative value between 0 and 128. Status is
a three step mnemonic, SRCH, TRCK or DATA defined by:
SRCH:
the receiver is searching for the satellite.
TRCK:
the receiver has locked to the satellite's data
sequence.
DATA:
the receiver is locked and downloading data
from the satellite.
SYS Mode Displays
SYS
o
. Elevation
SYS
173
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