Statistical modeling of interferometric signals in underwater applications
Proceedings of SPIE(2009)
摘要
Current sonar and radar applications use interferometry to estimate the arrival angles of backscattered signals at
time-sampling rate. This direction-finding method is based on a phase-difference measurement between two close
receivers. To quantify the associated bathymetric measurement quality, it is necessary to model the statistical
properties of the interferometric-phase estimator. Thus, this paper investigates the received signal structure,
decomposing it into three different terms: a part correlated on the two receivers, an uncorrelated part and an
ambient noise term.
This paper shows that the uncorrelated part and the noise term can be merged into a unique, random term
damaging the measurement performance. Concerning the correlated part, its modulus can be modeled either as
a random or a constant variable according to the type of underwater acoustic application. The existence of these
two statistical behaviors is verified on real data collected from different underwater scenarios such as a horizontal
emitter-receiver communication and a bathymetric seafloor survey. The physical understood of the resulting
phase distributions makes it possible to model and simulate the interferometric-signal variance (associated with
the measurement accuracy) according to the underwater applications through simple hypotheses.
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关键词
interferometry,ambient noise,statistical model,underwater acoustics,statistical modeling,data collection,modeling and simulation,radar
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