DOPPLER SPEED METER SYSTEM The Doppler Speed Meter System detects the infraction by a Continuous Wave Frequency Modulation Radar (FM-CW), using the Doppler Effect. When the detection of a vehicle above the permissible speed occurs, the system packs the measurement data, the instrument identification, the photographic record and digitally signs the packet using a non-removable cryptographic key. This ensures the authenticity of the source of the data and prevents subsequent amendments.



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