CA2540596A1 - Sonar system and process - Google Patents

Sonar system and process Download PDF

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Publication number
CA2540596A1
CA2540596A1 CA002540596A CA2540596A CA2540596A1 CA 2540596 A1 CA2540596 A1 CA 2540596A1 CA 002540596 A CA002540596 A CA 002540596A CA 2540596 A CA2540596 A CA 2540596A CA 2540596 A1 CA2540596 A1 CA 2540596A1
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CA
Canada
Prior art keywords
sonar system
signal
active sonar
acoustic
transmitting
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
CA002540596A
Other languages
French (fr)
Other versions
CA2540596C (en
Inventor
Donald Lerro
Larry Freeman
John Green
Dave Ashworth
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
AC Capital Management Inc
Original Assignee
Ac Capital Management, Inc.
Donald Lerro
Larry Freeman
John Green
Dave Ashworth
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Ac Capital Management, Inc., Donald Lerro, Larry Freeman, John Green, Dave Ashworth filed Critical Ac Capital Management, Inc.
Publication of CA2540596A1 publication Critical patent/CA2540596A1/en
Application granted granted Critical
Publication of CA2540596C publication Critical patent/CA2540596C/en
Expired - Fee Related legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
    • G01S15/00—Systems using the reflection or reradiation of acoustic waves, e.g. sonar systems
    • G01S15/02—Systems using the reflection or reradiation of acoustic waves, e.g. sonar systems using reflection of acoustic waves
    • G01S15/06—Systems determining the position data of a target
    • G01S15/08—Systems for measuring distance only
    • G01S15/32—Systems for measuring distance only using transmission of continuous waves, whether amplitude-, frequency-, or phase-modulated, or unmodulated
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
    • G01S15/00—Systems using the reflection or reradiation of acoustic waves, e.g. sonar systems
    • G01S15/003—Bistatic sonar systems; Multistatic sonar systems

Abstract

A sonar system and method of use capable of discriminating a direct acoustic signal present at 60 dB or more above the acoustic echo signal.

Claims (51)

1. A active sonar system for detecting object(s) in the water comprising:
a transmitter capable of continuously transmitting an acoustic signal;
a receiver capable of receiving a reflected acoustic echo of said acoustic signal from said object(s), and a direct acoustic signal from said transmitter;
wherein said receiver is capable of discriminating between said direct acoustic signal and said acoustic echo signal it receives from said object while said transmitter is transmitting;
wherein said discrimination can occur when the direct acoustic signal is present at 60 dB or more above the acoustic echo signal.
2. The active sonar system of claim 1 wherein said transmitter is continuously transmitting said acoustic signal.
3. The active sonar system of claim 1 wherein said transmitter is transmitting an acoustic signal which is <= 12 kHz.
4. The active sonar system of claim 1 wherein said transmitter is transmitting an acoustic signal which is <= 10 kHz.
5. The active sonar system of claim 1 wherein said transmitter is transmitting an acoustic signal which is <= 5 kHz.
6. The active sonar system of claim 1 wherein said transmitter is transmitting an omnidirectional acoustic signal.
7. The active sonar system of claim 1 wherein said transmitter is transmitting a signal with a reduced level of energy in the direction of the receiver.
8. The active sonar system of claim 7 wherein the energy is reduced from about 3dB to about 60 dB.
9. The active sonar system of claim 7 wherein the energy is reduced from about 5dB to about 25 dB.
10.The active sonar system of claim 7 wherein the energy is reduced from about 25dB to about 55 dB.
11. The active sonar system of claim 1 wherein said transmitter is transmitting a frequency modulated signal.
12. The active sonar system of claim 11 wherein said transmitter is transmitting a sweeped frequency modulated signal.
13. The active sonar system of claim 11 wherein said transmitter is transmitting a linear sweeped frequency modulated signal.
14. The active sonar system of claim 11 wherein said transmitter is transmitting a sweeped frequency modulated signal wherein the transmitted sweep is amplitude tapered to avoid frequency discontinuities at the beginning and end of each sweep.
15. The active sonar system of claim 11 wherein the frequency modulated signal is amplitude tapered to avoid frequency discontinuities.
16. The active sonar system of claim 11 wherein said Transmitter is transmitting a frequency modulated signal which is a frequency shift key.
17. The active sonar system of claim 14 wherein said transmitter is transmitting a frequency modulated signal which is a frequency shift key.
18. The active sonar system of claim 11 wherein said transmitter is transmitting a hyperbolic sweeped frequency modulated signal.
19. The active sonar system of claim 18 wherein said frequency modulated signal is amplitude tapered to avoid frequency discontinuities.
20. The active sonar system of claim 1 wherein said transmitter 's transmitting a single frequency continuous wave.
21. The active sonar system of claim 20 wherein the continuous wave signal is amplitude tapered to avoid discontinuities at its beginning and end.
22. The active sonar system of claim 1 wherein said receiver is a single hydrophone.
23. The active sonar system of claim 1 wherein said receiver is an array of hydrophones.
24. The active sonar system of claim 1 wherein said receiver comprises a vector sensor or array of vector sensors.
25. The active sonar system of claim 1 wherein said receiver has a dynamic range greater than about 80 dB.
26. The receiver of claim 1 wherein said discrimination capability is achieved by temporal frequency filtering.
27. The receiver of claim 1 wherein said discrimination capability is achieved by spatial filtering which attenuates said direct signal.
28. The active sonar system of claim 1, wherein said object is in motion.
29. The active sonar system of claim 1, wherein said object is stationary.
30. The active sonar system of claim 1, wherein said system is capable of detecting said object at a range greater than 10 kiloyards from the receiver.
31. The active sonar system of claim 1, wherein said system is capable of detecting said object at a range greater than 5 kiloyards from the receiver.
32. The active sonar system of claim 1, wherein said system is capable of detecting said object is at the same depth as either said transmitter or said receiver.
33. The active sonar system of claim 1, wherein said system is capable of detecting said object at a depth other than the depth of either said transmitter or said receiver.
34. The active sonar system of claim 1, wherein said system is capable of detecting an object beneath the ocean floor.
35. The active sonar system of claim 1, wherein said system is capable of detecting an object at any bearing in respect of said receiver.
36.The sonar system according to claim 1, wherein said acoustic signals comprise multi-frequency acoustic tone.
37. The sonar system according to claim 1, wherein said transmitter and said receiver are separated by 12 acoustic wavelengths or less.
38. The sonar system according to claim 1, wherein said discriminating between said acoustic signals includes bearing, range, and/or frequency domains.
39. The sonar system according to claim 1, wherein said receiver meets a rejection requirement, in either or both said bearing and frequency domains, of rejecting said transmitted signal so that said signal does not raise detection thresholds in said receiver's search domain.
40. A method for detecting sonar signals comprising:
transmitting an acoustic signal;

receiving, during said transmission of said acoustic signal, a reflected acoustic echo of said acoustic signal from object(s), as well as directly receiving said acoustic signal;
processing a signal of said acoustic echo and said direct acoustic signal in a manner to discriminate between said acoustic echo signal and said direct signal when said direct acoustic signal is present at 60 dB or more above the acoustic echo signal.
41. The method according to claim 40, wherein said transmitting is accomplished by emitting a single frequency continuous wave.
42. The method according to claim 40, wherein said transmitting is accomplished by emitting an omnidirectional acoustic signal.
43. The method according to claim 40, wherein said receiving is accomplished by using one or more hydrophones.
44. The method according to claim 40, wherein said receiving is accomplished by using a vector sensor or an array of vector sensors.
45. The method according to claim 40, wherein said discriminating is accomplished by performing temporal frequency filtering.
46. The method according to claim 40, wherein said discriminating is accomplished by performing spatial frequency filtering.
47. A method for detecting sonar signals comprising:
generating a waveform;
performing waveform shaping;
transmitting said waveform acoustically;
directly receiving said acoustic waveform and reflected echoes of said acoustic waveform;
performing temporal frequency rejection on said received acoustic waveforms;
optionally performing the step of spatially filtering said received acoustic waveform; and optionally tracking said detected reflected echoes.
48. The method according to claim 47, wherein said transmitting said waveform is accomplished by emitting a single frequency continuous wave.
49. The method according to claim 47, wherein said shaping is accomplished by performing amplitude tapering.
50. The method according to claim 47, wherein said waveform shaping is performed to avoid signal discontinuities.
51. The method according to claim 47, wherein said waveform shaping is performed to avoid signal discontinuities at its beginning and end.
CA2540596A 2003-09-29 2004-09-29 Sonar system and process Expired - Fee Related CA2540596C (en)

Applications Claiming Priority (5)

Application Number Priority Date Filing Date Title
US50650703P 2003-09-29 2003-09-29
US60/506,507 2003-09-29
PCT/US2004/031782 WO2005081686A2 (en) 2003-09-29 2004-09-29 Sonar system and process
US10/953,300 US7106656B2 (en) 2003-09-29 2004-09-29 Sonar system and process
US10/953,300 2004-09-29

Publications (2)

Publication Number Publication Date
CA2540596A1 true CA2540596A1 (en) 2005-09-09
CA2540596C CA2540596C (en) 2011-11-15

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Family Applications (1)

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CA2540596A Expired - Fee Related CA2540596C (en) 2003-09-29 2004-09-29 Sonar system and process

Country Status (5)

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US (3) US7106656B2 (en)
EP (1) EP1692542A4 (en)
JP (1) JP2007507691A (en)
CA (1) CA2540596C (en)
WO (1) WO2005081686A2 (en)

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Also Published As

Publication number Publication date
US20070058488A1 (en) 2007-03-15
EP1692542A4 (en) 2011-03-30
US20060007784A1 (en) 2006-01-12
US20100309751A1 (en) 2010-12-09
US7852709B1 (en) 2010-12-14
JP2007507691A (en) 2007-03-29
WO2005081686A3 (en) 2006-06-22
EP1692542A2 (en) 2006-08-23
CA2540596C (en) 2011-11-15
WO2005081686A2 (en) 2005-09-09
US7106656B2 (en) 2006-09-12
US7330399B2 (en) 2008-02-12

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