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Chapter 5 Command Reference
GPS Satellite Acquisition
Operating and Programming Guide 5-7
GPS Satellite Acquisition
The GPS Receiver is designed to acquire time transfer information (time, date,
and position) from the GPS satellites, which is used by the Receiver’s internal
reference oscillator and SmartClock technology to lock to GPS. It acquires a
precise time and date by tracking at least one satellite. By tracking at least four
satellites, it precisely determines the position of the antenna. With this
information, the Receiver can produce a precise 1 PPS signal that is exactly
synchronous to Coordinated Universal Time (UTC) as determined by GPS.
The following commands are provided to facilitate initiate GPS satellite
tracking, to establish accurate GPS antenna position, to select or ignore
satellites, to compensate for antenna cable delay, and to monitor the
acquisition.
!
Facilitating Initial Tracking
:GPS:INITial:DATE ...
:GPS:INITial:POSition ...
:GPS:INITial:TIME ...
!
Establishing Position
:GPS:POSition ...
:GPS:POSition?
:GPS:POSition:ACTual?
:GPS:POSition:HOLD:LAST?
:GPS:POSition:HOLD:STATe?
:GPS:POSition:SURVey:PROGress?
:GPS:POSition:SURVey:STATe ...
:GPS:POSition:SURVey:STATe?
:GPS:POSition:SURVey:STATe:POWerup ...
:GPS:POSition:SURVey:STATe:POWerup?
!
Selecting Satellites
:GPS:SATellite:TRACking:EMANgle ...
:GPS:SATellite:TRACking:EMANgle?
:GPS:SATellite:TRACking:IGNore ... (59551A)
:GPS:SATellite:TRACking:IGNore? (59551A)
:GPS:SATellite:TRACking:INCLude ... (59551A)
:GPS:SATellite:TRACking:INCLude? (59551A)
:GPS:SATellite:TRACking:<select>:ALL (59551A)
:GPS:SATellite:TRACking:<select>:COUNt?
:GPS:SATellite:TRACking:<select>:STATe? ...