Intel E810-CQDA2T - Check GNSS Overall Configuration Performance

Intel
®
Ethernet Network Adapter E810-CQDA2T
User Guide
40 722960-002
4.15.9 Check GNSS Overall Configuration Performance
You might want to check your antenna and GNSS receiver overall performance with the
Time-to-First-Fix (TTFF) value.
After a power-down (warm starts, hot starts), the GNSS device triggers a next TTFF value based on
antenna setting (or skyview, etc.). See the command line and TTFF value ttff 329907 in the following
example. The unit of ttff is nanosecond (smaller number is better).
# ubxtool -t -w 3 -p NAV-STATUS -P 29.20
1668999366.1330
UBX-NAV-STATUS:
iTOW 96984000 gpsFix 3 flags 0xdd fixStat 0x0 flags2 0x8
ttff 329907, msss 325236062
For more details how to configure the u-Blox ZED-F9T-00B module, refer to:
https://content.u-blox.com/sites/default/files/ZED-F9T_IntegrationManual_UBX-
21040375.pdf?hash=undefined
Note: In some cases, when GNSS loses the antenna reference, the GNSS might output for couple of
seconds the 1PPS signal and NMEA messages. To more rapidly disqualify the 1PPS and NMEA
messages, increase the filtering of GNSS receiver with ubxtool command:
# ubxtool -P 29.20 -v 1 -w 1 -z CFG-NAVSPG-OUTFIL_TACC,10,5
Or open two terminals and run:
# cat /dev/gnssX //Terminal 1
#echo -ne
"\xb5\x62\x06\x8a\x0a\x00\x00\x05\x00\x00\xb4\x00\x11\x30\x0a\x00\x9e\x1b
" > /dev/gnssX //Terminal2