In the framework of acoustic and seismic monitoring of airports for verifying disarmament or peace-keeping agreements, the propagation of sound emitted by aircraft close to the ground was investigated. The sound of taking-off, landing, and overflying aircraft was used to locate them by means of two 3-dimensional microphone arrays consisting of 4 microphones each and placed at a mutual distance of 150 m at 146 m to the runway centre. The base-length of the microphone arrays was 1.6 and 3.4 m. The varying propagation time of the sound from the source to the different sensors was determined by a cross correlation of the signals with a time resolution of 0.18 and 0.36 ms. Possible ambiguities due to periodic behaviour of the signals could be excluded: the dominant frequencies of the propeller-driven aircraft ( < 80 Hz) correspond to wavelengths larger than 4 m. In the case of jetaircraft, the broad-band noise leads to unambiguous cross correlation maxima (except for ground reflections). Normalised vectors pointing to the sound source were calculated from the propagation time differences of the sensors of a single array . Using these normalised vectors of both arrays, the location of the sound source in three dimensions was determined via triangulation. This was done for constant time intervals, yielding the whole trajectory of the aircraft The experimental set-up used here allowed a localisation accuracy of moving sound sources at distances of around 100-200 m in the order of 10 m.


    Access

    Access via TIB

    Check availability in my library

    Order at Subito €


    Export, share and cite



    Title :

    Medium-range localisation of aircraft via triangulation


    Contributors:
    Blumrich, R. (author) / Altmann, J. (author)

    Published in:

    Applied Acoustics ; 61 , 1 ; 65-82


    Publication date :

    2000


    Size :

    18 Seiten, 10 Bilder, 4 Tabellen, 15 Quellen




    Type of media :

    Article (Journal)


    Type of material :

    Print


    Language :

    English




    Low-flying aircraft spotted by transit triangulation

    Eichelberger, L. | Engineering Index Backfile | 1956


    Characterization of Aircraft Wake Vortices by Multiple-Lidar Triangulation

    Friedrich K-ograve / pp / Igor Smalikho et al. | AIAA | 2003


    Triangulation

    Hartley, R. I. / Sturm, P. | British Library Online Contents | 1997


    Ranging objects external to an aircraft using multi-camera triangulation

    RUTKIEWICZ ROBERT / ELL TODD ANTHONY / PESIK JOSEPH T | European Patent Office | 2020

    Free access

    RANGING OBJECTS EXTERNAL TO AN AIRCRAFT USING MULTI-CAMERA TRIANGULATION

    RUTKIEWICZ ROBERT / ELL TODD ANTHONY / PESIK JOSEPH T | European Patent Office | 2019

    Free access