Bissoli Nicolau, Victor and Coulon, Martial and Grégoire, Yoann and Calmettes, Thibaud and Tourneret, Jean-Yves Modified Cramér-Rao lower bound for TOA and symbol width estimation. An application to search and rescue signals. (2013) In: IEEE International Conference on Acoustics, Speech, and Signal Processing - ICASSP 2013, 26 May 2013 - 31 May 2013 (Vancouver, Canada).
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Official URL: http://dx.doi.org/10.1109/ICASSP.2013.6638646
This paper focuses on the performance of time of arrival estimators for distress beacon signals which are defined by pulses with smooth transitions. These signals are used in the satellite-based search and rescue Cospas-Sarsat system. We propose a signal model based on sigmoidal functions. Closed-form expressions for the modified Cramér-Rao bounds associated with the parameters of this model are derived. The obtained expressions are easy to interpret since they analytically depend on the system parameters. Simulations conducted on realistic search and rescue signals show good agreement with the theoretical results.
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