Echo Classification—Statistics of Echo Fluctuations

Widespread Use of Echo Classification Everyone has seen images of unborn babies from medical ultrasound and weather maps of incoming storm clouds from radar. What these technologies have in common is that they involve the classification of echoes received from sensor systems that send out a signal and receive echoes from objects of interest. In each case, echoes are classified into meaningful information, much like how a sonar operator listens for echoes from enemy submarines.