One of activities is software development for known high resolution (HR) methods as well as for new ones derived in the laboratory. From this page are available demos on:

• Study of high-resolution algorithms for arrival ANGLE estimating for UNCOHERENT signals
• Study of high-resolution algorithms for arrival ANGLE estimating for COHERENT signals
• Study of high-resolution algorithms for arrival TIME estimating for COHERENT signals

RETURN to: the acoustics start page | SIGNAL PROCESSING

The HR methods are used in:

• Primary signal processing for underwater target (source) detection and localization by the active (passive) sonar using matched field processing (MFP) technique. The primary processing provides to MFP procedures needed estimations of signal parameters: amplitudes, direction of arrivals, travel times and number of rays (modes).
• Analysis of spatio-temporal structure of acoustic signals and interferences by obtaining high resolution 3D visualizations of angular power spectra of signals, angle-time-amplitude diagrams, etc.
• High resolution estimating ocean medium parameters: surface, bottom scattering and reflecting coefficients, sound velocity and absorption in water or bottom, etc.

Some of HR methods require a minimum of available a priori information on the wave field. Other methods (so-called parametric methods) require a more accurate knowledge of signal and interference time-space structure. Optimum selection of an appropriate high resolution algorithm to solve some problem depends on several factors: signal and noise scenario, array configuration, observation time interval, correlation between signals, accuracy of needed paramater estimation, computational complexity. Software being developed allows to do the accurate choice of HR methods for undersea signal processing design.

There is an experience of using HR methods also in other fields of applications as radar, biomedical engineering, engineering for oil installations, etc. In particular, those methods were applied to solve following problems:

• High resolution estimating oil/water/gaz rates by using very high frequency electromagnetic signals.
• High resolution localization of dipole and extended sources in the humain brain, based on EEG data.