Cosine Error
Definition
The under-reading of true speed that occurs when the radar or LIDAR beam is not perfectly aligned with the vehicle's direction of motion. Always works in favour of the driver, never against.
Related terms
- ANPR
- Automatic Number Plate Recognition. A camera plus OCR pipeline that reads vehicle number plates at speed and logs the plate, timestamp, and...
- Calibration Cycle
- The periodic re-certification of a speed-measurement device against a traceable reference, usually annually for radar guns and every six months for LIDAR....
- Doppler Effect
- The change in observed frequency when the source and the observer move relative to each other. A radar gun emits a known...
- FASTag-ANPR Fusion
- Indian highway tolling pairs RFID FASTag reads with ANPR cameras at every electronic toll gantry, creating a national vehicle-position log that investigators...
- Time-of-Flight (LIDAR)
- A measurement principle where the device emits short laser pulses and times how long each pulse takes to return. Multiple pulses over...
Explained in
- Speed Detection Devices: Radar, LIDAR and ANPRThe under-reading of true speed that occurs when the radar or LIDAR beam is not perfectly aligned with the vehicle's direction of motion. Always works in favou...