GP-Blocker — RF Switch GNSS Jammer

Designed to protect a GNSS time server against high-power/military-grade GNSS spoofing.

All time servers are equipped with a high-stable local oscillator to provide an accurate clock if PTP or GNSS signals are unavailable. Therefore, the simplest and most reliable way to protect a time server against GNSS spoofing is to disable the GNSS antenna port and switch a time server to Hold Over mode.
The GP-Blocker is an RF switch with a remarkable 110 dB of RF isolation level and an embedded L-band GNSS jammer. The GP-Blocker is installed amid the time server and the GNSS antenna. In case GNSS spoofing is detected, GP-Blocker disconnects the GNSS antenna from the time server antenna port, the time server loses satellite signals and switches to “Hold Over” mode. This maintains high accuracy of the PPS signal under GNSS spoofing.