646265-004 37
Intel
®
Ethernet Network Adapter E810-XXVDA4T
User Guide
4.15.5 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 -f /dev/ttyGNSS_af00 -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
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