World Data Ocean/SCS WOA18 SSP

SCS WOA18 SSP

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Isochronal-band-constrained multipath structure matching for active sonar localization in convergence zones
Frontiers in Marine Science | New and Recent Articles

Isochronal-band-constrained multipath structure matching for active sonar localization in convergence zones

Active sonar localization in convergence zones (CZs) faces significant challenges due to complex multipath propagation. Traditional methods relying on simplified straight-line assumptions introduce range-initialization bias, degrading accuracy. This research presents a novel approach: isochronal-band-constrained multipath structure matching. Leveraging two-way travel-time (TWTT) analysis and ray theory, the method constructs isochronal bands to correct horizontal range, improving depth estimation even under sound speed profile (SSP) mismatches. Numerical simulations demonstrate a substantial reduction in depth error, achieving grid-resolution range accuracy.