Viavi 87339, Operation Manual

Page: 186 / 198

E - 5
To run the Trajectory File simulation, select Setup from the Main Menu. In the GNSS
window in the Simulation field select Trajectory. In the PRN Signal field select Traj File.
Set the RF Level in the RF Output window to the desired level (Figure E-8).
The Trajectory File records the Signal to Noise Ratio of the received GPS signal. During
playback the GPSG-1000 will adjust the RF Power Level to simulate the actual recorded
S:N. For this feature to work the simulation must be played back with the same Almanac
with which the recording was made. If the Trajectory File is played with a different
Almanac the positional simulation will run, but, the Simulation screen will show a “Red”
indicator for Traj Power and the RF Level will remain at the set level.
Fig. E-8 Setup Page, Trajectory Setup
Close the Setup page and select Simulation from the Main Menu. Press Run and the
Trajectory Simulation will start (Figure E-9)
Fig. E-9 Simulation Page, Trajectory File Running