Defence, public safety and critical infrastructure depend on accurate Positioning, Navigation and Timing (PNT), and with it on GNSS, which is increasingly exposed to jamming, spoofing and electronic warfare. The challenge is no longer just precision, but trusted operation when GNSS is contested or unavailable. The talk presents a multi-layered architecture:

ePRTC for autonomous atomic timekeeping
cnPRTC for resilient network-wide and nation-wide timing
HA-TT for sub-nanosecond terrestrial synchronisation over distances of up to 1,000 km

Using existing optical infrastructure and off-the-shelf optics, these create autonomous, UTC-traceable timing sources that keep running during extended GNSS outages. The session also covers detecting and mitigating spoo ...