|Various technologies for isolating a signal of interest from signals
received contemporaneously by an antenna are described herein. A time
period for which a signal of interest is present in a second signal can
be identified based upon ratios of values of the second signal to the
mean value of the second signal. When the ratio of the value of the
second signal at a particular time to the mean of the second signal
exceeds a threshold value, the signal of interest is considered to be
present in the second signal.