Time - frequency analysis of late time electromagnetic transients from radar targets

Radar target recognition based on late time target resonance detection has been widely reported in the literature. Determination of the commencement of the late time period is crucial when extracting such resonance information because including the early time components significantly degrades the accuracy of the extraction due to the time-varying behaviour in this portion of the signature. In this paper an investigation of the late time commencement point is carried out in the Time-Frequency domain using the example of a wire scatterer.