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Chapter 5 Command Reference
GPS Satellite Acquisition
Operating and Programming Guide 5-25
Monitoring Acquisition _________________________
(continued)
This query returns the list of satellites (PRN) that the almanac predicts should
be visible, given date, time, and location (if any of these values are incorrect,
the prediction will be incorrect). Each satellite is identified by its
pseudorandom noise code (PRN).
Response
A comma-separated list of satellite pseudorandom noise codes (<PRN>).
The range of each <PRN> is 1 to 32.
A response of 0 indicates no satellites predicted visible.
Theory
Satellites must be in view to be tracked. At least four satellites must be in view,
and tracked, to determine the position in position survey operation. Only one
satellite must be in view, and tracked, to maintain operation of the reference
oscillator locked to GPS when in position hold operation.
This query returns the number of satellites being tracked.
Response
If there are no satellites being tracked, this query returns a 0.
:GPS:SATellite:VISible:PREDicted?
RESPONSE FORMAT
Returns the list of satellites (PRN) that the almanac predicts
should be visible, given date, time, and location.
±
dd, ...
:GPS:SATellite:TRACking:COUNt?
RESPONSE FORMAT
Returns the number of satellites being tracked.
±
dd