Aspects of Signal Processing

The summer school held in Portovenere followed a tutorial format with the purpose of familiarizing postdoctoral or postgraduate students in the basic theories and up-to-date applications of present knowledge. Although, from a teaching point of view, a certain areount of overlapping is always useful, in order to avoid excessive duplication direct contact between lecturers expert in the same subject was encouraged during the preparation phase. In recent years computer facilities and theoretical implementa tion have considerably increased the possibility of solving problems relating to signal detection in noise. Any type of communication may take advantage of signal processing principles, including any type of physical measurement that can be considered as a non-semantic and/or quasi-semantic communication. Since signal processing techniques are common to many branches of science (telecommunications, radar, sonar, seismology, geophysics, nuclear research, space research and others), the advanced and sophisticated levels reached singularly in anyone of them could be used to the advantage of the others. In particular, underwater acoustics is a discipline which, to some extent, represents a practical general model that has permitted the development of signal processing techniques suitable to meet data reduction and interpretation needs of other branches of science. This ASI consequently underlined the inter-disciplinarity of signal proces sing in order that the principles of outstanding methods developed in one field may be adapted to others.

Inhalt
Subject 1 - Properties of Time/Space Variant Transmission Channel and Underwater Communications.- Multipath Propagation and its Effects on Sonar Design and Performance in the Real Ocean.- The Influence of Time- and Space-Variant Random Filters on Signal Processing.- Parametric Acoustic Arrays.- Acoustic and Electromagnetic Waves Propagating in a Tenuous Random.- Time-Frequency-Space Generalized Coherence and Scattering Functions.- Series Expansions of Velocity Profile, Horizontal Range and Travel Time of Ray Theory in Oceans.- Horizontal Spatial Coherence Measurements with Explosives and CW-Sources in Shallow Water.- Measurement of the Weighting Function of the Time-Variant Shallow Water Channel.- Subject 2 - Detection Estimation and Tracking Techniques.- Power-Spectrum Estimation.- to Detection and Estimation.- Modelling and Detection.- Bayes Optimal Versus Estimate and Plug Array Processor Performance when there is Directional Uncertainty.- A Sequential Likelihood Ratio Detection System.- Estimation of the Time Position of a Pulse in Noise.- Maximum Likelihood Detection of Signals in Noise of Unknown Level.- The Role of Coherence in Time Delay Estimation.- Target Classification and Hypothesis Testing.- An Adaptive Kalman Filter Tracker for Multi-Mode Range/Doppler Sonar.- Structure Estimation from Acoustic Reflection Measurements.- Subject 3 - Time-Space Processing, Adaptive Processing and Normalization, Quantization Methods.- An Introduction to Adaptive Processing in a Passive Sonar System.- Some Lessons from Array Processing Theory.- Number Theoretic Transforms.- Stationary and Nonstationary Learning Characteristics of the LMS Adaptive Filter.- An Adaptive Approach to Underwater Passive Detection.