Abstract
A generalisation of a switching based detector is examined, allowing the construction of such detectors for target detection in any clutter model of interest. Such detectors are important in radar signal processing because they are robust solutions to the management of interference. Although formulated in general terms, the theory is applied to the design of a switching constant false alarm rate detector for X-band maritime surveillance radar. It is shown that such a detector manages the problem of interference better than standard detection processes.
Highlights
Switching detectors were first examined in Cao (2008), which developed a switching Constant false alarm rate (CFAR) based upon the cell-averaging (CA)-CFAR for target detection in Exponentially distributed clutter
The purpose of this paper is to show how the application of a switching CFAR to Pareto clutter introduced in Weinberg (2014b) can be used to formulate a general switching detector for application to any clutter model of interest
This meant that setting the threshold multiplier for a switching detector could be done in a uniform way regardless of the underlying clutter model
Summary
Constant false alarm rate (CFAR) detectors are of considerable importance in radar signal processing, and as such, have been the focus of much research over the years (Goldstein 1973; Nitzberg 1979; Gandhi and Kassam 1988; Blake 1988; Shor and Levanon 1991; Anastassopoulos and Lampropoulos 1995; Nagle and Saniie 1995; Cao 2008; Meng 2009; Erfanian and Vakili 2009; Tablet and Soltani 2009; Pourmottaghi et al 2012; Qin et al 2013; Zhang et al 2013; Weinberg 2013, 2014; Zhang 2015). It is assumed that a series of independent and identically distributed clutter amplitude or intensity measurements are available, known as the clutter range profile, from which a measure of the clutter level is taken. This is normalised and compared to a cell under test (CUT). A number of guard cells are used to separate the CUT from the clutter range profile as illustrated. The normalisation is used so that the false alarm probability remains constant Such detectors are desirable because variations in clutter power can have serious consequences on detection performance, such as Weinberg SpringerPlus (2015)4:574
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