Nonlinear crosstalk in broadband multi-channel echosounders
نویسندگان
چکیده
Distortion of acoustic wave caused by nonlinear propagation transfers energy into higher harmonics the transmitted signal. When operating several broadband echosounders with non-overlapping frequency bands to cover a wide range, generated one band may interfere fundamental others. This interference (i.e., crosstalk) can adversely affect measured backscattered amplitude response and in some circumstances, appears as spurious targets above and/or below main target pulse-compressed echograms. The frequency-modulated waves directional beam was modeled used assess methods reduce deleterious effects harmonic components signal, also compared field experiments using seabed echo metallic sphere, good agreement. Two are shown materially crosstalk: (1) reduction transmit power, which reduces crosstalk larger amount than associated (2) selection proper Fourier window length processing stage. effect small (<0.4 dB or 10%) for area backscattering measurements, but could be strength measurements at different frequencies, depending on signals parameters.
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ژورنال
عنوان ژورنال: Journal of the Acoustical Society of America
سال: 2021
ISSN: ['0001-4966', '1520-9024', '1520-8524']
DOI: https://doi.org/10.1121/10.0002943