Robust correlation receiver for distance estimation

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Abstract

Many methods for distance estimation, such as the ultrasonic pulse-echo method, involve the estimation of a time-of-flight (TOF). In this paper, a signal model is developed that, apart from the TOF, accounts for an unknown, linear frequency dependent distortion as well as for additive noise. We derive a TOF estimator for this model based on the criteria of maximum likelihood. The resulting receiver can be seen as an extension or generalization of the well known cross-correlation, or “matched filter”, estimator described, e.g., by Nilsson. The novel receiver is found to be more robust against unknown pulse shape distortion than the cross-correlation estimator, giving less biased TOF estimates. Also, bias versus noise sensitivity can be controlled by proper model order selection

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  • Clinical Medicine
  • Medical Biotechnology
Original languageEnglish
Pages (from-to)596-603
JournalIEEE Transactions on Ultrasonics, Ferroelectrics and Frequency Control
Volume41
Issue number5
Publication statusPublished - 1994
Publication categoryResearch
Peer-reviewedYes

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