Measuring the mitigation of a jamming attack on a GPS server at the national physical laboratory of Israel

摘要

Based in Israel, GPSdome, the GPS cyber company, develops and manufactures a GPS anti-jamming / anti-spoofing module protecting GPS-based systems against jamming and spoofing of the GPS signal which disrupts navigation and timing applications. The testing and calibration of this module is performed by the Time and Frequency Laboratory of INPL. Two GPSdome modules (Rev 1.0) were calibrated with two GPS-locked servers (Microsemi's SyncServer S650): one with an internal (basic) quartz oscillator OCXO and one with an internal Rb oscillator. The Unit Under Test (UUT) was compared against the time reference (the Cs-clock), which was calibrated at INPL versus Israeli Time Standard UTC (INPL). For each GPSdome module the internal time delay was evaluated and it was 57.9 ns for GPSdome #1 and 153.6 ns for GPSdome #2. The calibration results evidently show, that both servers with GPSdome protection save traceability to high performance time reference with standard deviation only 10-15 ns in the presence of jamming.