SIRV - What does SIRV stand for? The Free Dictionary
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In  it was shown that from a reasonable and simple phenomenological model of clutter, the clutter returns from multiple pulses of a given range can be modeled as a SIRV distribution.
Standard clutter models of amplitude distribution, such as K and Weibull, are included in the class of Rayleigh mixture distributions which are related to the class of SIRV (spherically invariant random vector) distribution.