Lennart Koopmann

We also measure doppler of individual GNSS satellites, together with AGC adjustment counts, Carrier-to-Noise Density Ratio (C/N₀) and other RF indicators.

Strongest indicators remains location drift from a known stationary sensor.

A sky chart of all GNSS satellites in view from a @nzyme.org sensor, together with a computed horizon line.

There is a dip in the horizon line: A building blocking view of the Northern skies.

If a satellite is rising in an “invisible” area of the horizon, we have a spoofing indicator.