Abstract
The accurate measurement of a vehicle's velocity is an essential feature in adaptive vehicle acti- vated sign systems. Since the velocities of the vehicles are acquired from a continuous wave Dop- pler radar, the data collection becomes challenging. Data accuracy is sensitive to the calibration of the radar on the road. However, clear methodologies for in-field calibration have not been care- fully established. The signs are often installed by subjective judgment which results in measure- ment errors. This paper develops a calibration method based on mining the data collected and matching individual vehicles travelling between two radars. The data was cleaned and prepared in two ways: cleaning and reconstructing. The results showed that the proposed correction factor derived from the cleaned data corresponded well with the experimental factor done on site. In ad- dition, this proposed factor showed superior performance to the one derived from the recon- structed data.
Highlights
A range of road traffic safety solutions have been recently developed and used by public traffic agencies to ensure safety and traffic efficiency
A question raised in this paper is how calibration can be established with minimum equipment requirements in the field? Can a speed correction factor be derived from the available measurements collected by the radar? How can validation be completed through finding data driven by the correction factor? This paper proposes a systematic way to design an experiment for calibrating the radar with minimum requirements to be established in the field
A data based calibration system was applied to accurately correct vehicle velocity collected by a Doppler radar and used on the adaptive Vehicle Activated Sign (VAS) system
Summary
A range of road traffic safety solutions have been recently developed and used by public traffic agencies to ensure safety and traffic efficiency. One such traffic safety solution being investigated by traffic authorities is the Vehicle Activated Sign (VAS). VAS is a digital road sign that displays a message when a vehicle’s speed exceeds a pre-set trigger speed. Most existing VAS systems are static in nature. These systems have a pre-set trigger speed which is set relative to the static speed limit applied on a specific road.
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