5.5. Display Screens
5.5.1. Initialization: at initial turn-on, the unit first acquires satellite
information. During primary initialization, the logo and a number of
screens with status information are shown. Primary initialization
consists of serial port initialization, Ethernet initialization and
preliminary time downloaded from the battery backed RTC.
5.5.2. GPS Engine Initialization
During this phase, the front panel “Fault” LED will be ON (amber),
and the “Lock” LED (green) will be flashing.
Once the primary initialization is complete, the unit enters
initialization of the GPS engine itself. Depending on the position
mode selected, the time taken for this can vary considerably.
In fixed positioning mode, the unit waits until at least one satellite is
visible and tracked.
In “Survey” and “Mobile” positioning modes, the unit requires to see
at least 4 satellites in order to obtain position information, and
therefore will take longer, dependent upon satellite visibility
conditions.
Once GPS engine initialization is complete, the front panel “Fault”
LED will go OFF.
5.5.3. Oscillator Phase Locked Loop initialization
During this phase, the front panel “Fault” LED will be OFF, and the
“Lock” LED (green) will be flashing.
The unit automatically enters this mode following initialization of the
GPS engine, and during this mode is “locking” the internal oscillator
to the GPS generated 1PPS. Dependent upon the type of oscillator
fitted, the duration of this mode can vary. Fastest is the TCXO
(standard) version, followed by the OCXO and Rubidium versions
respectively.
To Next Page
Loading...