Bias-free estimates of the variance of time of arrival differences
P. Yansouni · IEEE Transactions on Acoustics Speech and Signal Processing · 1985
In the frequency domain estimation of time of arrival differences, phase data of the cross spectrum may show correlation between frequency bins due to either insufficient time-bandwidth product or the use of a nonrectangular window on the input signal samples. This correlation severely biases variance estimates if standard results of generalized least square theory are applied indiscriminately. A technique has been developed to eliminate the bias of variance estimates. Simulation results are provided.