Topics in harmonic analysis with applications to radar and sonar

Аннотация

These notes arc an introduction to basic concepts and tools in group representation theory, both commutative and noncommutative, that arc fundamental for the analysis of radar and sonar imaging. Several symmetry groups of physical interest arc treated (circle, line, rotation, ax b, Heisenberg, etc.) together with their associated transforms and representation theories (DFT, Fourier transform, expansions in spherical harmonics, wavelets, etc.). Through the unifying concepts of group representation theory, familiar tools for commutative groups, such as the Fourier transform on the line, extend to transforms for the noncommutative groups which arise in radar-sonar. The insight and results obtained will are related directly to objects of interest in radar-sonar, such as the ambiguity function. The material is presented with many examples and should be easily comprehensible by engineers and physicists, as well as mathematicians.