GNSS Module Series
LG77L EVB User Guide
LG77L_EVB_User_Guide 18 / 28
Figure 8: PMTK Command Sending via PowerGPS
5.3. Automatic TTFF Testing
The PowerGPS tool allows users to measure TTFF (Time to First Fix) under the following testing conditions:
Full cold start,
Cold start,
Warm start, or
Hot start.
Select the number
of tests from 1, 10, 20, 100, 1000 and 10000. Click the “
Run
” button to start the test.
Click
the “
Stop
” button to stop the test.
PowerGPS configuration steps for TTFF testing:
Step 1:
When running a TTFF test, these options need to be unchecked else it will affect the TTFF results.
These options include
“System time aiding”, “Reference location aiding”, “EPO aiding”, “Q BD
EPO aiding
”.
Click “
Setting
” menu to open the “
Options
” window and select “
AGPS Agent
”. Then you need
to disable these options as shown in the figure below.
Finally click “
OK
”.
