lloyds mirror effect | Comp.DSP | DSPRelated.com: "he basic effect is due to 2 signal paths of different lengths. When a broadband
(e.g. white noise) type signal is transmitted it produces a sinusoidal pattern
in the spectrogram or more usually for sonar Lofargram. When the source is
moving this causes the sinusoidal pattern to change over time.
By measuring the period of the sinusoidal pattern at the Closest Point of
Approach (CPA) , and by measuring the rate of change of the sinusoidal pattern
you can perform some target localization.
The basic effect is described in Richard Neilson's book 'Sonar Signal Processing'"
