Stratified Waveguide Acoustic Probing (SWAP): Autonomous Sub-Thermocline Waveguide Penetration and Closed-Loop Dual-Mode Acoustic Inversion

Stratified Waveguide Acoustic Probing (SWAP) introduces a closed-loop physical computing framework instantiated across the 100,000-node continuum of the Resonance Processing Unit (RPU) for autonomous sub-thermocline acoustic penetration, shadow-zone illumination, and covert sub-surface telemetry. Executive Summary & Paradigm Shift In oceanic acoustics, steep seasonal thermoclines (100–200 m) create massive, un-ensonified Acoustic Shadow Zones where conventional active sonar energy collapses due to continuous upward Snell refraction and sub-threshold noise floors (SNR ≤ -18 dB). SWAP overcomes these oceanographic barriers through continuous physical state relaxation across declarative potential landscapes (Vbias). Three-Stage Closed-Loop Execution Lifecycle Stage 1 (Passive Zero-Prior SSR Blind Discovery): Ingests unconditioned ambient oceanic noise streamed directly from physical transceivers. Through continuous spatial averaging and non-linear Kramers synchronization, the 100,000-node lattice isolates undisclosed sub-threshold tonals (12.90 Hz → 12.89 Hz, Δf = 0.01 Hz) beneath a -18.0 dB noise floor with zero prior spectral knowledge. Stage 2 (In-Situ Adaptive ARS Waveform Crystallization): Governed by non-linear ground-state energy minimization (Emin), the physical medium synthesizes bespoke Acoustic Resonant Sequence (ARS) preambles achieving zero DC baseline drift (Δμ < 10-5) and sharp aperiodic Dirac-delta autocorrelation. Stage 3 (Active Waveguide Illumination & Shadow-Zone Delivery): Surface-projected ARS wave packets couple natively into bidirectional Laplacian continua (∇2u), achieving 10.01% sustained acoustic energy reach (1.0012 × 10-1 amplitude) across 400 m simulated acoustic shadow zones (node index 80,000 in high-fidelity ocean digital twin modeling). Target Applications & Interoperability SWAP establishes an open physical-layer baseline for Autonomous Underwater Vehicles (AUVs), deep-sea oceanographic tomography, benthic cable diagnostics, and covert maritime monitoring. Standardized radix-2 binary assets (.bin) instantiate with zero hardware redesign across commercial SDRs, towed-array FPGAs, and marine sonar DSP matched-filter cores. Release Note (v2.0): Harmonized theoretical Welch bound compliance expressions, formalized explicit demarcation for oceanographic digital twin modeling benchmarks, and updated Hardware-in-the-Loop (HIL) telemetry specifications. Document ID: QN-SWAP-2026-V2Publisher: QuantNature GlobalCompanion Standard Specification: QuantNature Signal Forge Standard (QN-SFS-2026)