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3958215 |
Device for the acoustic submarine teletyping
This invention involves the acoustical transmission of messages from an individual operating under water to persons operating on the surface. A wrist-mounted, keyboard-actuated, acoustical signal...
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3958214 |
Encoded echo-ranging signal generator
1. An encoded echo-ranging signal generator comprising in combination; A digital shift register having a plurality of binary encoded stages, A shift pulse generator coupled to said digital...
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3939461 |
Correlation system using matched signals
4. A signal-reconstitution method for signals transmitted through a bounded medium comprising the steps of: Propagating a first signal from one point in said bounded medium; Receiving the...
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3932833 |
Instrument for direct measurement of the velocity of sound in a fluid
This invention provides an expendable velocimeter probe. High frequency transmitting and receiving transducers are mounted opposite to one another in axial alignment on the probe body and on a...
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3909773 |
Underwater teletype communication system
A diver-carried underwater communication system employs a visual read-out transmitted and received messages. The individual message elements are selected by a keyboard control device and are stored...
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3893062 |
Transmission system
A transmission system uses a carrier frequency subject to periodic variations according to a predetermined variation law. A local receiver frequency is also subject to periodic variations according...
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3893061 |
Underwater acoustic detection system
An underwater acoustic detection system having remotely located passive detection field units submerged underwater and a centrally located receiving station having an underwater receiver. The field...
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3878502 |
Ultrasonic temperature telemetry system
A temperature-sensitive implantable fish tag has been provided which employs a sensing thermistor located at the end of a flexible appendage which varies the repetition rate of an acoustic...
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3842398 |
APPARATUS AND METHOD FOR DEPLOYMENT OF EXPENDABLE VELOCIMETER TO ELIMINATE DOPPLER SHIFT ERROR IN THE MEASUREMENTS
A correction is applied to a sound velocity vs. depth profile in order to eliminate a Doppler shift caused by the relative speed between a transmitter on a velocimeter dropping through the ocean...
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3811106 |
UNDERWATER LOW FREQUENCY SONIC COMMUNICATION
This invention relates to very low frequency sound wave signaling and comication through sea water over long distances.
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3810146 |
ALARM SYSTEM FOR THE SAFETY OF NON-SWIMMERS
An alarm system for the safety of non-swimmers comprises a portable transmitter which is adapted to be attached to the body of the non-swimmer and to be activated on immersion in water, and a...
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3786406 |
AUTOMATIC DEVICE FOR SIGNALING FROGMAN ACCIDENTS
A novel system for detecting frogman accidents is disclosed. The system comprises an electronic sending system which emits an regualar acoustical signal, provided that the submerged frogman...
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3745518 |
METHOD FOR DETERMINING THE DISTANCE BETWEEN A VESSEL AND A REFERENCE POINT AND DEVICE FOR CARRYING OUT THIS METHOD
Method for determining the deviation distance of a vessel from a preselected point defined with respect to a set of sensors immersed in a predetermined position, comprising transmitting acoustic...
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3742440 |
SYSTEM FOR ACTIVATING A REMOTE UNDERWATER DEVICE
A system for activating a remote underwater device using a frequency coded acoustic wave generator having at least one notch frequency in the transmission spectrum. The generator is adapted to...
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3736551 |
SWIMMERS TACTILE COMMAND NAVIGATION APPARATUS
A command navigation apparatus including a back pad; a plurality of tactile ndicators mounted in the back pad for providing tactile sensory indicators on the back, the tactile indicators being...
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3728549 |
IN SITU DEVICE FOR MEASURING LIGHT SCATTERING
A self-contained, telemetering, fixed small angle forward scatterance meter or furnishing real-time data on light scattering intensity is provided. Collimated light from a laser is directed through...
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3688029 |
CABLELESS ACOUSTICALLY LINKED UNDERWATER TELEVISION SYSTEM
A cableless television system for viewing an underwater scene and acoustically transmitting data indicative of the scene to the surface for substantially immediate presentation. The system...
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3686656 |
SUNKEN VESSEL LOCATOR
A sound-generating instrument for use on a boat or other watercraft arranged to operate only if the boat is submerged, and which generates a sound under water to aid in locating and recovering the...
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3673552 |
METHOD AND APPARATUS FOR COMPILING MEASURED VALUES OF A VARIABLE PARAMETER
A method and apparatus primarily intended for commercial fishing craft for compiling at an observation station measured values of a variable parameter existing at one or more measuring locations...
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3656097 |
SIGNAL PROCESSING SYSTEM FOR EXTRACTING A PERIODIC SIGNAL OF UNKNOWN FREQUENCY FROM A HIGH LEVEL BACKGROUND NOISE
A detector identifies the frequency of a periodic signal buried beneath the threshold of background noise. A correlator compares the frequency of the output of a sweep generator with the incoming...
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3641427 |
ELECTRIC FIELD SENSOR
The invention is a method and means for sensing and measuring an electric eld within sea water or any other environmental medium. It contains three pairs of diametrically opposed electric current...
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3611276 |
INSTRUMENT FOR DIRECT MEASUREMENT OF THE VELOCITY OF SOUND IN A FLUID
The invention provides a free-falling underwater body which has a weight-drag characteristic that causes a stable rate of fall through water. The body contains an oscillator connected to a...
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3602876 |
METHOD OF DETERMINING TERMINAL VELOCITY OF A FREE-FALLING BODY
The disclosure concerns a method for determining the terminal velocity in ter of bodies having various hull shapes through the use of doppler techniques wherein a coherent oscillator on the body is...
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3593256 |
DOPPLER CORRECTION TECHNIQUE
Method and means for complete correction of Doppler shift in a transmitted pectrum of individual frequencies, or tones, constituting a multitone, coded pulse system in which the lowest (reference)...
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3541500 |
UNDERWATER COMMUNICATION AND CONTROL
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3517378 |
UNDERWATER LONG-DISTANCE SOUND-DETECTION SYSTEM
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3512125 |
UNDERWATER ACOUSTIC TELEMETERING SYSTEM
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3483837 |
STREAMLINED MISSILE DEVICE FOR LOCATION OF SUBMARINES
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3469231 |
UNDERWATER LOCATING AND INTERCOMMUNICATING DEVICE,PARTICULARLY FOR FREE-SWIMMING DIVERS
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3469189 |
METHOD AND SYSTEM FOR COMMUNICATION OF INFORMATION UTILIZING PULSE COMPRESSION PRINCIPLES
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3455151 |
EXPENDABLE OCEAN BOTTOM SENSOR
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3444510 |
MULTICHANNEL UNDERWATER ACOUSTIC TELEMETERING SYSTEM
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3441901 |
SYSTEM FOR MEASURING SOUND VELOCITY IN WATER AS A FUNCTION OF DEPTH
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3364744 |
Expendable bathythermograph
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3341808 |
Telemetering apparatus
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3336571 |
Underwater acoustic signaling system
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3329827 |
Decoder circuits
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3308667 |
Temperature determination system
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3305634 |
System and method of code communication
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3293595 |
Telemetering system
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3289152 |
Acoustic signaling system
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3281766 |
Communication system
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3273393 |
Bathythermograph
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3273112 |
Tuned seismic wave communication system
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3267420 |
Depth measuring apparatus
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3230500 |
Transmission of telephony spectrum over vlf channels
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3202040 |
Submarine positioner system
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3144171 |
Acoustic warning assembly for skin diving apparatus
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3135943 |
Underwater thermometric apparatus
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3133261 |
Depth finder of a vehicle in a fluid
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