Matches 51 - 100 out of 209 < 1 2 3 4 5 >
Match Document Document Title
5978316 Marine seismic source  
A seismic acoustic signal source includes a hull that has a wetted surface in contact with a body of water. When underway, the draft of the hull is substantially zero. An acoustic signal generator...
5956291 Underwater diving assistant apparatus  
An underwater diving assistant device. In one embodiment, the present invention comprises a hand-held unit including a display screen. Messages and drawings are written on the display screen using...
5894450 Mobile underwater arrays  
An oceanographic sampling system includes two or more underwater vehicles disposed in an array and an array controller for controlling the array of underwater vehicles as data is acquired. Each...
5792950 Submarine deployed sea-state sensor  
A submarine deployed sea-state sensor comprises an elongated housing having nose cone and an aft end, the housing having a forward buoyant chamber for receiving an accelerometer. Aft of the buoyant...
5784339 Underwater location and communication system  
A communication and position determining device for use in an underwater communication and position determining system wherein the device transmits a sequence of one or more data words, wherein...
5784337 Towed array with non-acoustic sensor module  
A towed array includes an array of N hydrophone groups and one or more nocoustic sensor modules structurally connected in-line with the array of hydrophone groups. The hydrophone groups and...
5740126 Turbo siren signal generator for measurement while drilling systems  
A self-propelled turbo siren modulator assembly is disclosed for use in an MWD system. The turbo siren includes a fixed turbine deflector located upstream from a rotor, which in turn is located...
5734624 Wide-band omni telemetry system  
The present invention comprises a wide-band omni telemetry system adapted r increasing the signal transmission bandwidth of an existing tactical array having a single shared transmission line. In...
5732044 System and method for compensating for doppler shifts in signals by downsampling  
A signal shift compensation system and method compensates for a shift in a ignal, such as a Doppler shift in an acoustic signal. The system includes a signal sampler for oversampling the shifted...
5701276 Underwater communication system by means of coded pulses  
An underwater communication system by coded pulses, includes a transmitter placed at a surface of a body of water, for transmitting coded pulses, the transmitter having a transmitter circuit for...
5687137 Methods and apparatus for adaptive oceanographic sampling  
An adaptive oceanographic sampling system includes several stationary acoustic tomography units distributed in an ocean volume, a processing and control system and at least one underwater vehicle...
5631874 Telemetry transmission protocol for towed hydrophone streamer  
Disclosed is a protocol for transmitting data in a towed hydrophone streamer, including a transmission method and a data frame. The method comprises the steps of (1) receiving a portion of the data...
5625320 Differential preamplifier and pre-emphasis network  
A preamplifier and pre-emphasis network is provided having a differential plifier exhibiting common mode noise rejection. The preamplifier is particularly suited for use with a double-sided sensor...
5592156 Underwater alpha-numeric communication system  
A bi-directional underwater communication system provides a submerged operator the ability to communicate with a surface operator. Provides two transceivers both containing keypads and displays...
5572485 Underwater acoustic transmission method and equipment to improve the intelligibility of such transmissions  
A method for underwater, acoustic transmission, characterized in that at the transmitting side, the signal to be transmitted first is sampled, digitized and stored and then un-sampled and...
5559757 Spatial diversity processing for underwater acoustic telemetry  
An underwater acoustic telemetry system uses spatially distributed receivers with aperture sizes from 0.35 to 20 m. Output from each receiver is assigned a quality measure based on the estimated...
5546359 Method and transmitter/receiver for transferring signals through a medium in pipes and hoses  
The present invention relates to a method and a transmitter/receiver for transferring signals through a medium in pipes or hoses, whereby at a transmitter side pressure pulses are generated of...
5530682 Method and apparatus for transmitting an information signal  
An apparatus and improved method for transmitting an information signal. According to the improved method, an information signal is transmitted under water from a transmitter located at a first...
5523982 Communication apparatus  
The invention relates to diver-to-diver communication apparatus. There is provided a communication apparatus (2) for diver to diver communication, the apparatus comprising a waterproof casing (4),...
5493612 Secure communication keying system  
The secure communication keying system has a noise generator whose output a predetermined finite band of noise within, for example, the zero to eleven hundred cycle per second range. The noise...
5469403 Digital sonar system  
A transponder of an active digital sonar system identifies a multifrequency underwater activating sonar signal received from a remote sonar transmitter. The transponder includes a transducer that...
5452262 Radio telemetry buoy for long-range communication  
A remotely controlled radio telemetry buoy serves as a communication link tween an underwater acoustic interrogation/receiving transponder system and a remotely located surface platform. The buoy...
5432754 Receiver for receiving a plurality of asynchronously transmitted signals  
A multiuser receiver for use in additive white Gaussian noise, multiple-access communication channels. The receiver includes an interference estimator which estimates multiple-access interference...
5412620 Hydroacoustic communications system robust to multipath  
A hydroacoustic communication system employs spread spectrum to mitigate multipath interference caused by acoustic reflections off underwater surfaces and other large boundaries or acoustic...
5383164 Adaptive system for broadband multisignal discrimination in a channel with reverberation  
A system for separating mixed signal sources by processing a received signal through the combination of a beamforming network and an adaptive Herault-Jutten network. The conventional Herault-Jutten...
5377165 Communication system for submarines  
Submarines are provided with underwater self-propelled vehicles that are nched from the submarines and guided by trailing fiber optic cables. Each underwater vehicle has a hull that is separable,...
H001371 Submerged sensing system using line array segments  
An underwater sensing system has a trunk cable that transmits a plurality clock signals from its first end to its second end. A plurality of signal handling nodes are installed successively along...
5331602 Acoustic navigation and diving information system and method  
The positions of one or more underwater divers or vehicles are determined through an underwater acoustic communication link and at least a base buoy and one remote buoy with acoustic transponders...
5303207 Acoustic local area networks  
An underwater local area network for oceanographic observation and data acquisition includes a network node for telemetering data to a final destination and a plurality of sensors each of the...
5301167 Apparatus for improved underwater acoustic telemetry utilizing phase coherent communications  
An underwater acoustic communications system utilizes phase coherent modulation and demodulation in which high data rates are achieved through the use of rapid Doppler removal, a specialized sample...
5291459 Signal processor having multiple distributed data buffers  
A hydrophone analog signal data acquisition, A/D conversion and data transsion system includes a first-stage signal processing subsystem which provides digital representations of the hydrophone...
5187691 Underwater signaling device and method  
A signaling apparatus for generating an audible sound includes a housing containing a cylindrical chamber having two ends, an end member secured over each end, and a projectile member contained...
5185605 Dive profile recorder  
A dive profile recorder for monitoring conditions encountered by a diver under water includes a plurality of transducers to be carried by a diver for generating electrical signals representative of...
5166906 Towed underwater acoustic speed sensor  
A system for measuring the speed in water of an underwater towed array has towbody connected in close proximity to the array by means of a rope drogue. The towbody has a freely turning propeller...
5159580 Acoustic transducer for sending and receiving acoustic communication signals  
A uniquely designed acoustic transducer comprising a stack of piezoceramic elements (other piezoelectric materials may be used) mounted upon a tuned, shaped transmit/receive head made of hardened...
5159579 Apparatus for encoding fishfinder image information and transmission method  
When a signal from a calling device is received by a remote-located fishfinder, the fishfinder emits supersonic waves to a body of water below it and receives reflected waves from a fish shoal as...
5124955 Underwater communication system  
A digital underwater communication system includes a transmitter and a receiver. An oscillator bank in the transmitter generates a plurality of signals, each having a unique frequency. A timed...
5121366 Underwater communication system  
An underwater communication system provides reliable underwater transmission of digitally encoded communications as a series of consecutive acoustic frequency pulses (40) wherein the frequency of...
5099458 Underwater detection system  
The present invention relates to an underwater detection system which radiates ultrasonic wave search signals by a transmitter disposed at a first point in the water, receives echo signals...
5050136 Super polyelectrolytic communication links  
Apparatus and process for providing a communication link between separate submersibles and, in particularly, for providing communication between a launched submersible and a host submersible. A...
5047990 Underwater acoustic data acquisition system  
An acoustic data acquisition system for shipboard use is disclosed that allows for underwater acoustic data measurements at preselected submerged marine structural coordinates using a free...
5029147 Acoustic, underwater, telemetry system  
An acoustic, underwater, telemetry system between two vehicles, a free-rung, deep-operating, sonar platform, or Sonaray vehicle, to overcome refraction, and a surface ship to provide processing of...
5018114 Adjustable frequency diversity acoustic communications system  
An underwater acoustic communication system provides an operator with adjable frequency diversity so that data rates may be tailored to specific multipath environments. Transmitted messages are...
4999606 Dive parameter indicating assembly  
A dive parameter transmitter/receiver assembly for scuba diving includes a transmitter circuit with a control unit with one or more sensors for detecting dive parameters and/or information to be...
4951263 Spread spectrum underwater location beacon system  
An underwater location beacon emits a continuous wave signal which is phase-shift modulated by a pseudo-noise, spread spectrum code. This signal is detected with an exact replica of the transmitted...
4933917 Means for monitoring the laying of a deep sea cable or flexible pipeline  
Apparatus for monitoring the laying of a deep sea cable or flexible pipeline (1) from a vessel (22). The apparatus comprises a sleeve threaded on the cable or flexible pipeline and having sliding...
4932006 Process for signal transmission without electric connection through a conducting wall, the hull of a ship for example, and a device for implementing same  
A process is provided for transmitting a signal, without material connection, through a conducting wall which may be a ship's hull, to external user apparatus. A current supplied by a generator and...
4920522 Method and apparatus for measuring electrical or magnetic fields  
A method and apparatus for measuring electrical or magnetic fields, such as high-frequency alternating fields in a nuclear magnetic resonance tomography device, convert a test signal into a...
4905211 Precision doppler effect compensator  
A precision Doppler effect compensator provides Doppler compensation in astic transmission by simultaneously sending a known reference signal with an information signal. The information signal and...
4820953 Rate of ascent monitor using piezoelectric transducer  
A rate of ascent monitor for drivers uses a sound transducer with velocity characteristics, preferably a diaphragm type piezoelectric transducer, to sense rate of pressure change, and a threshold...
Matches 51 - 100 out of 209 < 1 2 3 4 5 >