The automatic target detector for High Resolution Radar(HRR) is considered. The detection performance of HRR is very important for target recongnition and imaging. Due to the size of the target is larger than the range resolution cell of the radar, the backscatered power of the target is recorded as a function of time. So a mapping from the function into a point of the real line or numbrical value T 0 is done. If T0 is greater than lambda 0 (threshold), then H1 is accepted, otherwise H0 is accepted. In this paper, the method of conversion is also considered.
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