Offset estimation for microphone localization using alternating projections

In this paper, we focus on solving the time delay as a separateproblem to the reconstruction of the microphone and sound locations.The time delay estimation appears as one of the main steps in sensorcalibration problem, once the time delays are known or estimated, wecan solve the time-difference-of-arrival problems by converting them totime-of-arrival problems. In this paper we make use of an alternatingprojection approach for estimating time delays. We show both forsimulated and real data that alternative projecting algorithm yieldsgood estimates of the time delays, even when provided with bad initialestimations. The method is also easy to implement and comparativelyfast