The GP-Cloud anomaly detection and classification algorithms are sensitive to the “correct” setup of GNSS antennas and are calibrated under the following working conditions:
• GNSS antennas are installed above adjacent buildings and structures, ensuring visibility of the entire sky.
• There is no industrial wideband interference from nearby equipment in the GNSS bands.
By adhering to the above rules, the false positive spoofing detection rate should be within 0.2% over a daily interval.
You can check this rate in the GP-Cloud user interface. You need to go to the map and enable statistics mode. Select "Spoofing" as the data type:
Reason 1: GNSS antennas are installed incorrectly, with many signal reflections from buildings.
Solution 1: Install the GNSS antennas at the highest possible point. Follow antenna installation tips: https://support.gpspatron.com/a/solutions/articles/101000466605
Reason 2: There is a lot of interference in the GNSS operating bands.
You can check for the presence of industrial noise in GP-Cloud on the Spectrum Waterfall and Power in Band graphs. Example of a complicated interference environment resulting in a high false positive rate of spoofing and jamming detection:
Solution 2: Identify the devices generating the interference and place the GNSS antennas as far away from the source of interference as possible. Use metallic elements of structures to minimize the strength of the interference.