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	Sample interval Sampling Sampling platform San Pedro Shelf SAR SAS Satellite altimetry Satellite antennas Satellite applications Satellite communication, multiaccess Satellite measurements Satellite navigation systems Satellite telemetry Saturation Scale patterns Scan conversion Scatter channels Scattering Scattering centers Scattering indexes Scattering matrices Scattering parameters Scattering tomography Scientific visualization Scintillation detectors Scour Sea Sea clutter Sea coast Sea current estimation Sea floor Sea floor bathymetry Sea floor mapping Sea ice Sea measurements Sea spikes Sea structures Sea surface Sea surface electromagnetic scattering Sea surface radar clutter Sea-state charts Sea-surface electromagnet backscatter Sea, electrical equipment Sea, electromechanical cables Sea, electronic equipment Sea, mechanical cables Seafloor phenomena Seafloor roughness Seafloor scattering Seafloor sediments SeaMARC II Search methods Search operations Search radar Secondary radar Sector scan sonar Sector scanning sonars Secularity Sediment concentration Sediment sound speed Sediment suspension Sediments Seeing through turbid water Segmentation Seismic inverse problems Seismic measurements Seismic signal processing Seismic transducers Seismic waves Seismo-acoustics Seismology Seismometers Self-cohering Self-organizing feature maps Self-starter Self-survey Sensor array processing Sensor arrays Sensor fusion Sensor response Sequence estimation Sequential decoding Sequential detection Shadowing Shallow water Shallow water power spectrum Shallow-water acoustics Shallowing sound channel Shape measurement Shape reconstruction Shaped-beam antennas Sharkbite Shear turbulence Ship motion Ship operation Ship propeller speed Ships Short-duration oceanic signals Side-looking airborne radar Side-looking sonar Side-scan Side-scan (side-looking) sonar Signal analysis Signal classification Signal coherence Signal design Signal detection Signal fluctuations Signal gain Signal processing Signal processing and detection Signal processing arrays Signal reconstruction Signal representations Signal resolution Signal sampling Signal sampling/reconstruction Signal-to-multipath ratio Signatures Simplex genetic algorithm Simulated annealing Simulating annealing Simulation Simulation software Singular perturbation theory Size measurement SIZEX Slepian models Slew rate limitation Sliding-mode control Smoothing methods SOFAR Software development environments	Software, operating systems Solar power generation, OTEC Solar radiation Solitons Sonar Sonar and acoustic radar Sonar applications Sonar arrays Sonar calculations Sonar clutter Sonar data processing Sonar detection Sonar displays Sonar distance measurement Sonar echoes Sonar images Sonar imaging Sonar imaging/mapping Sonar mapping Sonar measurements Sonar navigation Sonar position measurement Sonar propagation Sonar resolution Sonar scatter Sonar scattering Sonar sequences Sonar signal analysis Sonar signal design Sonar signal processing Sonar stabilization Sonar system Sonar target recognition Sonar terrain factors Sonar testing Sonar tracking Sonar transducer arrays Sonar transducers Sonar velocity measurement Sound scattering Sound speed Source localization Source localization/tracking Space-time adaptive processing Space-time correlation Space-time processing Space-vehicle radar Spar buoy Sparse arrays Spatial and temporal coherence of medium Spatial averaging beamformer Spatial filters Special issues and sections Speckle Spectral analysis Spectral spreading from bubbles Spectrophotometry Spectrum zooming Speech coding Speech communication Speech synthesis Spheres Spheroids Split-beam sonar Split-step Padé solution Spread-spectrum Spread-spectrum communications Spread-spectrum navigation Spreading function Squint SSM/I data Stability Stability criteria Stability derivatives Stability indices Standards State estimation State space State-space methods Static and dynamic modeling Stationary Statistical analysis Statistical image processing Statistics Steady current and silty clay Steel-concrete composite structure Stochastic approximation Stochastic inverse method Stochastic modeling Stochastic processes Stock origin Stokes drift Strain gages Strain measurement Strain transducers Strap-down inertial navigation system (SINS) Stress measurement Strip scatterers Structural engineering Structures Submarine cables Submarine lightwave cable Submarine rescue Subsea Subsea intervention Subspace methods Superlong electromagnetic waves Surf noise Surf zone Surface acoustic wave devices Surface acoustic waves Surface current convergence Surface current estimation Surface currents Surface waves Surveillance radar Suspended matter density condenser Swallow floats Swath bathymetry Switched-capacitor circuits Switches Symbol synchronization Synchronization Synthetic aperture Synthetic aperture(s) and underwater sonar Synthetic-aperture imaging Synthetic-aperture radar Synthetic-aperture sonar System identification System uncertainty Systolic Systolic arrays