Abstract
To measure high accuracy ground velocity by the TD(Time Differential) GPS(Global Positioning Systems) usage only, it is impossible to measure the velocity for the GPS propagation obstacle period. Interpolating the velocity to integrate the acceleration, together with GPS Doppler velocity, we developed high accuracy speedometer. This equipment could replace the optical speedometer or fifth wheel speedometer, and could have the advantages of easy installation and accurate measurement irrespective of GPS propagation obstacle and road surface conditions.
