PNT — positioning, navigation and timing — is the trio of services satellite constellations like GPS provide: where you are, how to get where you're going, and what time it is to nanoseconds. The timing leg quietly synchronises power grids, telecoms and financial markets.
Understanding PNT
One solution, three services
The receiver's four-unknown solve — three coordinates and clock bias — delivers all of PNT at once: the coordinates are positioning, their sequence and dynamics feed navigation filters, and the clock-bias estimate disciplines local time to constellation time, itself steered to UTC within nanoseconds. Timing receivers simply invert the emphasis: fixed position surveyed once, all satellite information poured into the clock estimate.
The resilience ledger
Denial scenarios are graded: local jamming (kilometres, cheap), regional spoofing (aircraft and ships routinely mis-located near conflict zones), constellation-level threats. Mitigations map accordingly — antenna nulling and inertial bridging for jamming, signal authentication (Galileo OSNMA operational, GPS Chimera coming) for spoofing, and system diversity for the top tier. National timing centres increasingly maintain fibre-distributed backup timescales precisely so grids and telecoms can ride out a bad GNSS week.