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Acquisition in phase demodulation: application to ranging in radar/sonar systems

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2 Author(s)
J. M. N. Leitao ; Inst. de Telecommun., Inst. Superior Tecnico, Lisbon, Portugal ; J. M. F. Moura

Ranging in radar/sonar systems is cast as a phase/frequency detection problem. In phase/frequency demodulation, there are two stages: acquisition, which resolves the global prior uncertainty before phase/frequency locking; and tracking, which follows the phase/frequency variations. In this work, ranging corresponds to absolute phase acquisition formulated as a global nonlinear filtering problem. The proposed solution propagates the associated multimodal density and generates a process relating global covariance with the single modes common covariance. Acquisition is then defined as the first passage of this process across a given threshold. Statistics such as acquisition time histograms and acquisition performance, characterizing the behavior of the developed estimator/detector, are obtained by Monte Carlo simulations.<>

Published in:

IEEE Transactions on Aerospace and Electronic Systems  (Volume:31 ,  Issue: 2 )