“…It is well known that in most communication systems, such as radar, sonar and radio mobile, the underlying noise density is often partially known due to the changing conditions in the propagation medium so that it is not safe to employ a fully parametric description of it during the stages of receiver design [1]. In this case non-parametric detectors provide a strong alternative to parametric detectors for they guarantee acceptable performance by maintaining a constant false alarm rate (or significance level), a, under the null hypothesis, H 0 [2].…”