This paper addresses the definition, properties and modeling requirements of wideband and ultra-wideband radar;. It begins by establishing the criteria by which the designation 'wideband' might he specified, since the common def~tion based purely on relative bandwidth fails to invoke some important associations. Next, the role of simulation is discussed and a representative simulation environment is described. The advankges and disadvantages of increasing the signal bandwidth are then evaluated quantitatively in the context of signal detection, parameter measure-men< and the recognition of aerial target classes and types, with reference to specific classes of interest. ln practice, certain other issues arise, including the degree of immunity to interference and electromagnetic capability. These topics are discussed in terms of their dependence on signal bandwidth and the associated signal acquisition and processing. In addition, an emerging problem is the need to take into account the possibility of signal exploitation and LPI. The essence of the theory of unauthorized signal detection that limits the LPI possibilities is briefly considered.
The methodfor optimizing adaptive CFAR detectors is proposed on the basis of using the a priory information about the interference variance. Possible applications of the method proposed are discussed.
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