Comparison of three post-processing methods for acoustic localization

Abstract

Recently, the need of monitoring parking places, airports, and harbours has increased. Microwaves, infrared based techniques, vision, or acoustics are the key techniques but each of them requires a specific kind of postprocessing. Far field target localization methods based on Angle Of Arrival (AOA) often neglect the possibility of erroneous angle observations. Three different methods for increasing the accuracy of cross fixing based localization are compared. Average of the AOAs is easily corrupted by outliers, "m out of k"-selection of AOAs suffers from loss of data. Signal energy based target location circle is used to validate the cross fixing result, thus improving reliability. The energies of averaged target signals from two arrays are used to calculate a circle on which the target resides. Distance from the cross fixed location to the circle is used to validate the location. Experiments are carried out with simulated and real data.

Heterogeneous sensor networks: a bio-inspired overlay architecture

“…With six or more UGSs detecting an event, estimating the location of an event can be solved in a number of known ways [1,3,4,5,7]. However, when the number of UGSs that detect an event is below six, the problem becomes increasingly hard; in fact, the general problem has been shown to be a constrained non-convex quadratic programming problem that is non-polynomial (NP) hard [9].…”

Comparison of a Diffracting and a Non-Diffracting Circular Acoustic Array

“…With the availability of digital signal processing methods, free-field array geometries have lead to such applications as the sniper detector, which uses a 3-D free field array to localization impulsive events based on time delay of arrival (TDOA) methods. Several methods have been offered to increase the accuracy of TDOA methods, such as cross-fixing, energy based localization, and statistical methods [2]. In the realm of teleconferencing, digital microphone array processing techniques have been used to augment the accuracy of current TDOA methods [3].…”