Title :
Direction finding in random inhomogeneous media in the presence of multiplicative noise
Author :
Ringelstein, Jörg ; Gershman, Alex B. ; Böhme, Johann F.
Author_Institution :
Signal Theory Group, Ruhr-Univ., Bochum, Germany
Abstract :
The performances of high resolution array processing methods are known to degrade in random inhomogeneous media. Such a degradation is caused by random amplitude and phase variations of source wavefronts. In this letter, the popular covariance matching approach to direction finding in the presence of multiplicative noise is extended to the multiple source case. Using a few unrestrictive physics-based assumptions on the environment, we derive a generic multiplicative noise data model. Based on this model, new direction finding techniques are proposed.
Keywords :
array signal processing; covariance analysis; direction-of-arrival estimation; inhomogeneous media; random media; amplitude variations; covariance matching; direction finding; high resolution array processing methods; multiple source case; multiplicative noise; phase variations; random inhomogeneous media; source wavefronts; unrestrictive physics-based assumptions; Coherence; Degradation; Direction of arrival estimation; Fluctuations; Nonhomogeneous media; Scattering; Sensor arrays; Signal processing; Signal resolution; Working environment noise;
Journal_Title :
Signal Processing Letters, IEEE
