A new approach to signal registration with the emphasis on variable time delay estimation

Signal registration is concerned with the problem of estimating a varying displacement between two random processes. We approach signal registration here as a recursive demodulation problem in which the recursion is between signal estimations and displacement estimation. Special attention is given to the problem of estimating a variable time delay. Thus, we present new algorithms for estimating D(t) from received processes: r
1
(t) = s(t) + n
1
(t) r
2
(t) = s(t - D(t)) + n
2
(t) where s(.) is signal and n
1
(.) and n
2
(.) are noise. Simulation results are presented and discussed.