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US 7,599,253 B1Granted
Hybrid pressure and vector sensor towed array
AssigneeThe United States of America as represented by the Secretary of the Navy
InventorDehua Huang
Life of this patent
Estimating the term…
Abstract
The invention as disclosed is of a combined acoustic pressure and acoustic vector sensor array, where multiple acoustic pressure sensors are integrated with an acoustic vector sensor in a towed array as a means of resolving the left-right ambiguity of the multiple acoustic pressure sensors.
Claims1
A towed or a line array of acoustic sensors for use with an underwater vehicle comprising:
- a linear array of n acoustic pressure sensor elements;
- an acoustic vector sensor element located at the acoustic center of the linear array of n acoustic pressure sensor elements;
- wherein the linear array of n acoustic pressure sensor elements generates a beam pattern based on the equation:
- D
- 1
-
-
- (
- θ
- ,
- φ
- )
- =
- {
-
- ∑
- j
- =
- -
- (
- n
- -
- 1
- )
-
- /
-
- 2
- (
- n
- -
- 1
- )
-
- /
-
- 2
-
-
- A
- j
-
-
- exp
-
- [
- ⅈ
-
-
- 2
-
-
- π
- λ
-
-
- (
- j
-
-
- d
- )
-
-
- cos
-
-
- θ
-
-
- cos
-
-
- φ
- ]
- p
- max
-
-
- (
- θ
- ,
- φ
- )
-
-
- sin
-
-
- (
- n
-
-
- π
-
-
- d
- λ
-
-
- cos
-
-
- θ
-
-
- cos
-
-
- φ
- )
- n
-
-
- sin
-
-
- (
- π
-
-
- d
- λ
-
-
- cos
-
-
- θ
-
-
- cos
-
-
- φ
- )
-
-
-
- A
- L
- =
- A
- M
- ,
- L
- ,
- M
- =
- -
- (
- n
- -
- 1
- )
-
- /
-
- 2
- ,
- -
- (
- n
- -
- 1
- )
-
- /
-
- 2
- +
- 1
- ,
- …
-
-
- (
- n
- -
- 1
- )
-
- /
-
- 2
- where θ is the angle of bearing, φ is the angle of depression and elevation, n is the number of acoustic pressure sensors, d is the distance between the sensors and λ is the wavelength of the sound wave;
- wherein the acoustic vector sensor element generates a beam pattern based on the equation:
- D2(θ,φ)=|w0p+wx cos θ cos φ+wy sin θ cos φ+wz sin φ|
- where w0, wx, wy, and wz are weighting coefficients to the hydrophone x-, y-, and z-axial vector sensor signal output;
- and
- wherein a multiplication operation in signal processing for the n acoustic pressure sensors and the acoustic vector sensor generates a beam pattern based on the following hybrid equation:
- D
- 1
-
-
- (
- θ
- ,
- φ
- )
- ·
- D
- 2
-
-
- (
- θ
- ,
- φ
- )
- =
-
- ∑
- j
- =
- -
- (
- n
- -
- 1
- )
-
- /
-
- 2
- (
- n
- -
- 1
- )
-
- /
-
- 2
-
-
- A
- j
-
-
- exp
-
- [
- ⅈ
-
-
- 2
-
-
- π
- λ
-
-
- (
- j
-
-
- d
- )
-
-
- cos
-
-
- θ
-
-
- cos
-
-
- φ
- ]
- p
- max
-
-
- (
- θ
- ,
- φ
- )
-
- ·
-
- w
- 0
-
-
- p
- +
- w
- x
-
-
- cos
-
-
- θ
-
-
- cos
-
-
- φ
- +
- w
- y
-
-
- sin
-
-
- θ
-
-
- cos
-
-
- φ
- +
- w
- z
-
-
- sin
-
-
- φ
-
- ;
- and
- wherein based on said hybrid equation a sonar system can resolve the left-right ambiguity for said linear array of n acoustic pressure sensor elements;
- and the hybrid towed array directivity D(θ,φ)=D1(θ,φ)·D2(θ,φ) is rotate able in all directions.
330 more elements
Dependencies are inferred from the claim text.