10.6. Synthetic Aperture Sonar
As mentioned in Section 10.5 longer sonar transducers and higher frequencies produce higher resolution at shorter ranges. However, higher frequencies reduce swath width due to sound attenuation. There is a limit on the transducer length a towfish or AUV can carry. The range resolution (RR) normal to the towfish/AUV track can be improved by using broadband pulses, where B (unit: Hz) is the sonar pulse bandwidth and c (unit: m/s) is the sound velocity, i.e.:
(10.99)
The horizontal (along-track) resolution (AR) is determined by:
(10.100)
where λ (unit: m) is wavelength, Ls (unit: m) is sonar length along the ...
Get Applied Underwater Acoustics now with the O’Reilly learning platform.
O’Reilly members experience books, live events, courses curated by job role, and more from O’Reilly and nearly 200 top publishers.
