Reference
Glossary
- CRPA(Controlled Reception Pattern Antenna)
- An antenna that spatially filters out interference.
- eLoran(enhanced Long-Range Navigation)
- A terrestrial, high-power, GNSS-independent PNT system; a leading resilience alternative.
- GNSS(Global Navigation Satellite System)
- The generic term for all satellite constellations (GPS, Galileo, GLONASS, BeiDou). GPS is one GNSS.
- GPS(Global Positioning System)
- The United States satellite navigation system; the most widely used GNSS. One of several GNSS constellations.
- Grandmaster clock
- The device distributing precise time across a network, usually disciplined by GNSS.
- Holdover
- How long a clock stays accurate after losing its reference signal.
- Jamming
- Drowning genuine satellite signals in radio noise so receivers cannot use them.
- PNT(Positioning, Navigation and Timing)
- The three services derived from satellite signals, underpinning far more of modern infrastructure than navigation alone.
- PTP / NTP(Precision Time Protocol / Network Time Protocol)
- How time moves through networks. PTP for microsecond-class needs, NTP for general use.
- RTS 25
- The MiFID II technical standard on clock synchronisation for trading venues and firms.
- Spoofing
- Broadcasting counterfeit satellite signals so receivers report false position or time without error.
- Traceable time
- Time provably linked, through an unbroken documented chain, to UTC. The regulatory standard.
- UTC(Coordinated Universal Time)
- The global reference timescale.