UACE2023: HIGH DUTY CYCLE ACTIVE SONAR USING BROADBAND DOPPLER-SENSITIVE WAVEFORMS: EXPLOITING A TRIPLET ARRAY FOR ATTENUATING DIRECT PATH INTERFERENCE



  • Session: 11. Large Time-Bandwidth acoustic signals for target detection and tracking
    Organiser(s): Tesei Alessandra
  • Lecture: HIGH DUTY CYCLE ACTIVE SONAR USING BROADBAND DOPPLER-SENSITIVE WAVEFORMS: EXPLOITING A TRIPLET ARRAY FOR ATTENUATING DIRECT PATH INTERFERENCE [invited]
    Paper ID: 1004
    Author(s): Datum Michael
    Presenter: Datum Michael
    Presentation type: oral
    Abstract: The class of active sonar waveforms that are Broadband and Doppler Sensitive (BBDS) is investigated for High Duty Cycle (HDC) sonar applications. BBDS waveforms include Pseudo Random Noise (PRN), Frequency Shift Keyed (FSK), and various phase modulated waveforms. The work here focuses on random Minimum Shift Keyed (MSK) sequences, which provide good band constraint with efficient power levels, though much of the analysis applies to the entire class of waveforms. HDC sonar presents challenges for BBDS waveforms due to matched-filter sidelobe masking from the direct path. A technique is developed for suppressing the direct path as well its specular surface and bottom interaction, which exploits the properties of a triplet hydrophone array. Data from the Littoral Continuous Active Sonar 2015 (LCAS 15) experiment is analyzed, in which an echo repeater serves as the target.
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  • Corresponding author: Mr Datum Michael
    Affiliation: Applied Physical Sciences Corporation
    Country: United States
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