Localization of the Acoustic Sources of the A340 with a Large Phased Microphone Array During Flight Tests

Tracking and Characterization of Aircraft Wakes Using Acoustic and Lidar Measurements

“…The pressure-squared values of the array output power were summed over the desired band for each type of processing. Note that spectral band levels were calculated after completion of the vectorial (complex) operations depicted in equation (4). This prevented possible significant bias errors in summing across phase-shifted cross spectral bands.…”

“…This work was extended 3 to localize airframe noise sources on commercial aircraft during flyover. Another test campaign examined airframe noise sources on an Airbus A340 4 and buzz-saw noise from an Airbus A319 5 .…”

Investigation of Aircraft Wake Vortices with Phased Microphone Arrays

“…It was first proposed for aeroacoustic applications by Billingsley & Kinns. 3 A recent application to moving sources on a flying Airbus A340 is reported by Piet et al 4 where a detailed description of the beamforming technique on moving objects is included. It is shown by Siller et al 5 for an aero-engine on a static free-field testbed, that the source localized on the nozzle can be correlated with a pressure signal from inside the combustion chamber to investigate the contribution of combustion noise to the noise emission of this engine.…”

Two-stage Localisation Scheme Using a Small-scale Linear Microphone Array for Indoor Environments

“…Other than GNSS, short-ranged signals such as WiFi, Bluetooth (Bahl and Padmanabhan, 2000;Chen et al, 2013;Gomes and Sarmento, 2009;Pei et al, 2010b;Pei et al, 2010c;Priyantha et al, 2000), Radio-Frequency Identification (RFID) (Ni et al, 2004), Ultra Wideband (UWB) (Pahlavan et al, 2006), longranged signals such as Global System for Mobile communications (GSM) (Syrjärinne, 2001), Digital Television (DTV) , and magnetic fields (Storms et al, 2010) have been utilised in indoor localisation for schemes such as proximity, fingerprinting, or triangulation. Microelectromechanical Systems (MEMS) motion sensors offer the opportunity of continuous relative navigation when the localisation infrastructure is unavailable Chen et al, 2011a;Chen et al, 2011b;Foxlin, 2005;Indoor Atlas Ltd, 2011;Mathews et al, 2011;Pei et al, 2010a;Pei et al, 2011;Pei et al, 2012;Pei et al, 2013).…”