2 ADAPTIVE ALGORITHMS FOR MULTIPATH TIME-DELAY ESTIMATION

The problem of time delay estimation (TDE) with multipath transmission s arises often in many sonar and radar systems. Two adaptive algorithm s based on a parameter estimation approach are proposed to estimate th e difference in arrival times of a signal at two separated sensors in the presence of multipath propagation. The first method uses an adapti ve IIR filter to eliminate the multipath signal in each transmission c hannel prior to applying a constrained delay estimation algorithm to e xtract the time difference between the two received outputs. The secon d employs two constrained adaptive FIR filters to perform equalization of the multipath arrivals, and time delay is then derived using a con strained delay estimator similar to that in the first method. Computer simulations are presented to compare and contrast the tracing capabil ity and convergence behavior of these multipath TDE methods.