… Usually, it is known that a Doppler shift can occur only within a certain range of frequencies;
then the filter is placed outside this range and an estimate of signal-to-noise may still be
obtained. 3) The estimation device is merely a conventional AGC loop that operates only on a
sample of the input noise. … The purpose of this correspondence is to suggest a definition for
the threshold probability and to evaluate efficient approximations that will bound this probability
from below and above. The noise term in (I), JY’, n(t)s(t - t*)dt, is a stationary zeromean …