Abstract
Sonar signal processing techniques based on acoustic models of shallow ocean environments are frequently of limited use for the mid- to high-frequency regimes typical for active sonar. To make use of acoustical models of the environment, signal processing algorithms typically require better-than-a-wavelength accuracy in the acoustic path estimates. Given this limitation, and practical knowledge that can be expected for shallow ocean environments, model-based signal processing schemes are often limited to frequencies below approximately 1 kHz. This frequency limitation is overcome by extending a recent passive source localization technique (frequency difference matched field processing, see Worthmann et al., JASA 138, 3549-3562, 2015) to monostatic active sonar target localization, where strongly reverberant environments can obscure a desired target echo. The frequency difference active sonar technique is presented along with comparisons to existing detection and localization algorithms. Additionally, simu...
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