Noncontact Road Profiling System. Volume 2. Calibration and Maintenance Manual

摘要

This report includes the calibration and maintenance instructions for a road profile measuring system using an inertial reference. Digital data processing has been developed to operate with an acoustic height sensor and accelerometer. These signals are A/D converted, sampled and processed. The time based signals are converted to a distance base, using a speedometer generated signal. The processing combines the accelerometer and height signal and produces a road profile independent of speed and direction of travel. The sampling parameters can be selected to provide desired wavelength cutoff between 0.5 and 300 feet. This range covers all the wavelengths of interest for pavement vehicle interactions, while removing the effect of grades.