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United States Patent

Woodsum , et al.
July 21, 1998

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 each data word includes a plurality of data bits transmitted in parallel as a corresponding number of concurrently transmitted signals, each of which occupies a different frequency band. The signals have waveforms selected from a pair of fade resistant waveforms that can be discriminated from one another, to represent binary data and the frequency bands are separated from one another by guard bands having widths sufficient to prevent intersymbol interference between the signals representing the data bits of a data word due, for example, to doppler and phase/frequency shifting, and successive data words are separated sequentially in time by intervals having a duration sufficient to prevent intersymbol interference between the signals of successive data words due to multipath reverberation. A single one of the signals of a data word is used for position determination wherein two devices each determine the bearing to one another from the bearing of the signals received from the other and a round trip propagation time determined from the time delay in transmitting an interrogation data word, a first response data word and a second response data word. Various alternative implementations of the invention are described.


United States Patent

Doucette , et al.
August 7, 2001

Underwater location and communication device


An electronic device for use by recreational divers, that uses ultrasonic signals to measure distance, to indicate relative direction, and to maintain contact between at least two diving partners during a diving session. One of the devices is worn and operated by each diving partner, and each device, through an arrangement of ultrasound transmitters and receiver pairs affixed thereto, monitors relative distance between itself and each other device in use by a diving partner. The device has a user interface, including a plurality of push-buttons and liquid crystal display, to set and indicate relative distance, relative direction, low battery fault, and chime or vibration warning mode. The warning mode alerts a diver when a distance limit between companion divers has been exceeded.


United States Patent

September 9, 1997

Homing device for underwater divers


This invention is in the field of underwater ultrasonic communications systems, more particularly, underwater acoustic homing devices suitable for diver direction finding. This invention utilizes a single omnidirectional sound source and a simple receiver, located in close proximity to a scuba diver's torso and equipment. The acoustic discontinuity of the diver's torso and equipment provides the required directional sensitivity, thus allowing the device to incorporate the desirable characteristics of flexibility in range in combination with a simple receiver housing.


United States Patent

Prichard , et al.
October 29, 1996

Navigational device for a scuba diver


A navigational device (10) for assisting a scuba diver in determining a direction toward and a distance from a dive boat (12) or to a buoy near the shore at which point the dive originated. The navigational device (10) includes a transponder unit (16) carried by a boat (12) and an interrogator unit (34) carried by a diver. The interrogator unit (34) includes at least one transducer (68) positioned for detecting signals from the transponder unit (16). Direction and distance indicators (46,50) are carried on the surface of the interrogator unit (34) for visual indication to the diver. The transponder unit (16) repeatedly pulses an identification signal to be received by the interrogator unit (34). When a valid identification signal is received by the interrogator unit (34), the direction from which the signal was received is determined and displayed. When the distance to the boat (12) is required, a signal is emitted from the interrogator unit (34). Upon receipt of the distance request signal, the transponder unit (16) emits a distance response pulse. The distance between the diver and the boat (12) is then determined by the interrogator unit (34) as a function of the time elapsed between the emission of the distance request signal and the receipt of the distance response pulse.


In the field of scuba diving it is well known that it is sometimes difficult for a diver to find his or her way back to the dive boat. There are several situations which make this especially difficult. Specifically, when the diver cannot see the dive boat, navigating a route to the boat is difficult. Further, when several dive boats are within a close range, it can be difficult to find the boat from which the diver embarked.

Other devices have been produced for underwater communication, or for determining range and bearing of objects under water. Typical of the art are those devices disclosed in the following U.S. Patents:


U.S. Pat. No.

Inventor(s) Issue Date


4,563,758 C.J. Paternostro

Jan 7, 1986

4,604,733 B.F. Brown, et al.

Aug 5, 1986

5,185,605 J.W. Roberts, Jr., et al.

Feb 9, 1993

5,331,602 C.B. McLaren Jul 19, 1994


That device disclosed by Paternostro ('758) is provided for acoustic communication between divers. This type of device, however, does not assist a diver in finding his or her way back to a dive boat. Specifically, the '758 device is not capable of determining a distance or a direction to a dive boat.

The device taught by Brown, et al., ('733), is an apparatus for determining range and bearing between a transponder and a transponder interrogator. Brown, et al., incorporate two spaced-apart hydrophones on the transponder for use in determining the direction toward the interrogator. The bearing is determined by the transponder and is communicated to the interrogator by sending a delayed signal, the delay being indicative of the bearing. Because of the configuration of this apparatus, the orientation of the two transducers must be maintained in order to give useful bearing information. For example, if the transponder is rotated ninety degrees (, the diver will receive an indication that he or she has moved in the opposite direction that amount, and not that the transponder has moved.

McLaren ('602) teaches an acoustic navigation and diving information system and method using the global positioning system (GPS). Specifically, the system utilizes a base buoy and a remote buoy. A diver carries a tracking unit which is in continuous communication with the buoys, which are monitored by a base station unit. This type of system determines positioning data using triangulation methods.

Finally, Roberts, Jr., et al., ('605), teach a device for monitoring the water temperature in a diver's environment, and further for monitoring the air pressure within the diver's air tank. The '605 device is not capable of determining direction or distance from

Fredrik Ljung
Fredrik Ljung 2003-06-28 01:45:00
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Huvudinlägg UV-navigation Martin Sundell 2003-06-27 09:54
svara Sv: UV-navigationJoakim Brosten2003-06-27 10:18
svara Sv: Sv: UV-navigationDan Berg2003-06-27 10:58
svara Sv: UV-navigationHenrik Jonsson2003-06-27 10:39
svara Fler tipsPär Ahlgren2003-06-27 11:13
svara Sv: Fler tipsMartin Sundell2003-06-27 12:33
svara Så någon orkade...Pär Ahlgren2003-06-27 12:44
svara Man kan oxåRichard Åhnberg2003-06-27 15:04
svara Sv: UV-navigationFredrik Ljung2003-06-28 01:45


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