The Laser-photodiode based vehicle Detection System (LBDS) is an advanced vehicle detector. Its detection principle is based on projecting laser beams to the road and receiving the echo laser. The system not only has the capability to provide timely traffic information such as traffic volume and vehicle speeds on highway, but also has the capability to measure vehicle profile, such as length, with high accuracy. When the operation environment such as the road surface condition, the weather and the daylight changes, which is likely to happen over the long-term lifespan of the LBDS, the LBDS may require recalibration. To solve this problem, a digitally-controlled optimal selfcalibration method for LBDS is presented in the paper. The calibration procedure, which can be implemented automatically under the control of a microcontroller, enables the LBDS to optimize its detection ability in different operating environments by setting the margins of signal and noise to optimal values. With the calibration, the LBDS has the ability to operate reliably in a wide range of applications, and has the ability to provide correct and accurate detection information over the long term. The field test results of the LBDS using the proposed selfcalibration method confirm the effectiveness of the selfcalibration method.
Digitally controlled optimal self-calibration for a laserphotodiode array based vehicle detection system
Digitale Selbstkalibrierung eines Fahrzeugsensors zur Verkehrsüberwachung bestehend aus zwei Laserphotodioden
2005
8 Seiten, 8 Bilder, 1 Tabelle, 15 Quellen
Conference paper
English
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