Energy-based source localization with non-ideal energy decay factor
Ming Sun, K. C. Ho · IEEE International Conference on Acoustics Speech and Signal Processing · 2008
Free-space propagation with the energy decay factor equal to two is often assumed in energy-based localization algorithms. In practice, non-ideal energy decay factors that are different from two can occur. This paper derives the Cramer-Rao Lower Bound (CRLB) for source localization with non-ideal energy decay factor and performs a sensitivity analysis of the localization algorithm presented in [6] with respect to the energy decay factor. The algorithm in [6] is found to be quite sensitive to the variations in the energy decay factor. This paper then proposes an extended algorithm for [6] that takes the non-ideal energy decay factor into account. Simulations show that the proposed solution reaches the CRLB accuracy for Gaussian noise as the signal-to-noise ratio tends to infinity.