MANUAL P/N 900000118 REV D
17
5.3.2.1
Navigating the interactive GPS status page
To navigate the interactive map of the GPS constellation, click and drag the map to
reposition the map hemisphere, using the left and right motion of your pointer to
adjust the orientation of the map, and the up and down motion of your pointer to
adjust the angle of the map.
5.3.3
Viewing the Current Phase Lock Status
From the “MENU” button, select “Phase-Lock” from the status section, this will
display an interactive graph showing the current Tuning Value and both Raw Phase
and Filtered Phase.
The Raw Phase shows the difference between the reference and the PTU timing.
The filtered phase shows the value of the phase after passing through a software
filtering algorithm to remove the pulse-to-pulse jitter typically found in a GPS
receiver, the tuning value shows the control input to the PTU Oscillator.
Figure 7 - PTU Phase Status Page