- T -
	Tactile sensors Target characteristics Target classification Target detection Target motion analysis Target physics Target recognition Target strength Target tracking Targets TDMA (time-division multiple-access) Technician training Technology forecasting Telecommunication network routing Telemetry Teleoperation Teleprinters Telerobotics Temperature measurement Temperature sensors Temporal coherence Terminology Terrain mapping Test facilities Testing Text communication Texture analysis Theme word Theoretical study and numerical experiments Thermal factors Three-dimensional ray acoustics, amplitude, eikonal, and phase functions Three-term control Thrust control Thruster modeling Tide gauges Tides Tiltmeter Time constant Time dispersion Time domain measurements Time series Time spread Time spreading Time-complexity Time-delay estimation Time-delay modeling Time-division multiple-access Time-domain analysis Time-frequency analysis Time-frequency modeling	Time-frequency processing Time-series models Time-varying channels TMA Toeplitz-averaged correlation function Tolerance analysis/assignment Tomography Tomography, acoustic Tonals Torque Towed arrays Towed cables Towed vehicle Tower pontoon system Towfish altitude Toxicity Tracking Tracking algorithms Tracking filters Tracking loops Training Transducer design Transducer modeling Transfer functions Transformers Transforms Transient analysis Transient propagation Transient response Transient scattering Transients Transition frequency Transmission loss Transponders Transport equation Trawl-resistant Tree searching Tributyltin TRIMBLE 4000A LOCATOR Tsunami Tungsten materials/devices Turbidity Turbulence Turbulent bursts TV cameras TV image sensors TV imaging Twisted quartic spine Two-phase flow Two-point boundary conditions

- U -
	UHF antennas UHF radio communication UHF radiometry Uncertain systems Underground electromagnetic communication Undersampling Undersea taxonomic classification Underwater acoustic arrays Underwater acoustic communications Underwater acoustic imaging Underwater acoustic measurements Underwater acoustic propagation Underwater acoustic scattering Underwater acoustic telemetry Underwater acoustic transducer arrays Underwater acoustic transducers Underwater acoustics Underwater antennas Underwater archeology Underwater channel Underwater communication cables Underwater communication system Underwater communications Underwater electromagnetic antennas Underwater electromagnetic propagation Underwater electronic equipment Underwater equipment Underwater imaging Underwater interface Underwater manipulator Underwater measurements Underwater microscope Underwater noise Underwater object detection	Underwater optical communication Underwater optical fiber systems Underwater photogrammetry Underwater positioning Underwater radio communication Underwater radio propagation Underwater robot Underwater robotics Underwater signal processing Underwater sound Underwater structures Underwater target classification Underwater technology Underwater Technology '98 Underwater telemetry Underwater television Underwater vehicle Underwater vehicle communication Underwater vehicle control Underwater vehicle detection and tracking Underwater vehicle electrical systems Underwater vehicle navigation Underwater vehicle power systems Underwater vehicle propulsion Underwater vehicles Underwater vision Underwater work systems Unequal error protection (UEP) United Kingdom United States Unmanned underwater vehicles Unstationary signal Unsteady propulsion

- V -
	V-block terminal joint Variable-structure systems Variance of estimates Variational methods Vector quantization (VQ) Vector sensors Vehicle motion Velocity control Velocity measurement Velocity sensors Ventilation system Vertical arrays Vertical directionality Vertical line arrays Vertical noise directionality Very large-scale integration (VLSI) VHF measurements VHF radio communication Vibrations analysis	Video cameras Video coding Video imaging Video recording Video signal processing Video techniques Viewpoint invariance Visual serving Visual system VLF ocean acoustics VLF seismo-acoustics VLSI Void-fraction Voltage measurement Volterra series Volume backscattering models Volume scattering Vortex lattice method Vortices Voting methods