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US 7,254,092 B2Granted
Method and system for swimmer denial
AssigneeRaytheon Company
InventorFrederick R. DiNapoli
Life of this patent
Estimating the term…
Abstract
A method and system for swimmer denial transmits underwater sound associated with a time-reversed impulsive response, resulting in amplified sound at a predetermined location. The amplified sound has sufficient peak pressure and/or impulse area to form a barrier to an underwater swimmer.
Claims26
A system to provide amplified sound at a predetermined location, comprising:
- an impulsive signal generator adapted to provide an electrical impulsive signal;
- a first acoustic projector coupled to the impulsive signal generator, disposed at a selected one of a first location and a second location, and adapted to transmit an acoustic impulsive signal in accordance with the electrical impulsive signal, wherein the acoustic impulsive signal has a time duration less than a time difference between two multipath sound arrivals for sound propagating between the first and second locations;
- a hydrophone disposed at the unselected one of the first location and the second location and adapted to provide a hydrophone signal in response to the acoustic impulsive signal;
- a waveform processor adapted to generate a time-reversed version of the hydrophone signal in accordance with a time-reversed acoustic impulsive response from the first location to the second location;
- and
- a second acoustic projector disposed at the first location and adapted to transmit an acoustic signal in accordance with the time-reversed version of the hydrophone signal, resulting in sound at the second location having at least one of a peak pressure substantially larger than a peak pressure apart from and proximate to the second location and an impulse area substantially larger than an impulse area apart from and proximate to the second location.
3 more elements
A method of generating amplified sound at a predetermined location, comprising:
- generating an electrical impulsive signal;
- transmitting an acoustic impulsive signal at a selected one of a first location and a second location in accordance with the electrical impulsive signal, wherein the acoustic impulsive signal has a time duration less than a time difference between two multipath sound arrivals for sound propagating between the first and second locations;
- receiving sound pressure resulting from the acoustic impulsive signal at the unselected one of the first location and the second location;
- determining an acoustic impulsive response from the first location to the second location in accordance with the received sound pressure;
- time reversing the acoustic impulsive response;
- and
- transmitting an acoustic signal at the first location in accordance with the time-reversed acoustic impulsive response, resulting in sound at the second location having at least one of a peak pressure substantially larger than a peak pressure apart from and proximate to the second location and an impulse area substantially larger than an impulse area apart from and proximate to the second location.
4 more elements
A system to provide amplified sound at a predetermined location, comprising:
- a waveform processor adapted to predict an acoustic impulsive response between a first location and a second location in accordance with an acoustic impulsive signal having a time duration less than a time difference between two multipath sound arrivals for sound propagating between the first and second locations and adapted to generate a time-reversed version of the acoustic impulsive response;
- and
- an acoustic projector disposed at the first location and adapted to transmit an acoustic signal in accordance with the time-reversed version of the acoustic impulsive response, resulting in sound at the second location having at least one of a peak pressure substantially larger than a peak pressure apart from and proximate to the second location and an impulse area substantially larger than an impulse area apart from and proximate to the second location.
A method of generating amplified sound at a predetermined location, comprising:
- predicting an acoustic impulsive response between a first location and a second location in accordance with an acoustic impulsive signal having a time duration less than a time difference between two multipath sound arrivals for sound propagating between the first and second locations;
- time reversing the acoustic impulsive response;
- and
- transmitting an acoustic signal at the first location in accordance with the time-reversed acoustic impulsive response, resulting in sound at the second location having at least one of a peak pressure substantially larger than a peak pressure apart from and proximate to the second location and an impulse area substantially larger than an impulse area apart from and proximate to the second location.
1 more element
Dependencies are inferred from the claim text.