Abstract
Constant false alarm rate (CFAR) radar detectors designed to operate in Rayleigh distributed clutter do not generally perform satisfactorily in the presence of non-Rayleigh clutter due to their operating in significantly deviated clutter environments and also due to their inability to maintain CFAR in non-Rayleigh clutter. Data collected by high-resolution radars have confirmed the non-Rayleigh nature of certain land and sea clutter, often described by multi-parameter log-normal, Weibull or K-statistic models. In this paper, we investigate two CFAR detectors operating in nonhomogeneous Weibull clutter and multi-target interference. First, estimates of the unknown Weibull clutter parameters are employed to obtain a CFAR detector other than the log-t detector for Weibull clutter. Instead, it is shown that there is a one-to-one correspondence between the log-t detector and the proposed alternative, thus giving statistical justification for the use of the log-t detector in Weibull clutter. Performance characteristics of the log-t detector are then presented in homogeneous as well as nonhomogeneous Weibull clutter and multi-target environment, and detailed comparisons are made.
Published Version
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