Velocity Measurement using the Fdoa Method in Ground-Based Radio Navigation System

Abstract

Velocity is one of the main navigation parameters of moving objects. However some systems of position estimation using radio wave measurements cannot provide velocity data due to limitation of their performance. In this paper a velocity measurement method for the DS-CDMA radio navigation system is proposed, which does not require full synchronization of reference stations carrier frequencies. The article presents basics of FDOA (frequency difference of arrival) velocity measurements together with application of this method to an experimental radio navigation system called AEGIR and with some suggestions about the possibility to implement such FDOA measurements in other kinds of asynchronous DS-CDMA radio networks. The main part of this paper present results of performance evaluation of the proposed method, based on laboratory measurements.

Comparison of Time Warping Algorithms for Rail Vehicle Velocity Estimation in Low Speed Scenarios

“…This last constraint forces monotonic spacing of the points regarding the time. Direct solving the optimization problem according to (8) is not feasible because of the exponential computational complexity ) ( n n O . Instead, a cost matrix that contains all accumulated costs along all possible paths up to the concerned cell is created.…”