Unlock instant, AI-driven research and patent intelligence for your innovation.

A passive localization method of single-vector hydrophone based on array invariant

An array-invariant and passive positioning technology, which is applied in the field of passive positioning of single-vector hydrophones based on array invariants, can solve problems such as weak positioning methods dependent on prior knowledge of the marine environment, and achieve the effect of reducing dependence

Active Publication Date: 2018-04-24
HARBIN ENG UNIV
View PDF3 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0013] The purpose of the present invention is to solve the problem that the existing method is weakly dependent on the prior knowledge of the marine environment and the positioning method needs to know the marine environment information in advance, and proposes a passive positioning method for single-vector hydrophones based on array invariants

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • A passive localization method of single-vector hydrophone based on array invariant
  • A passive localization method of single-vector hydrophone based on array invariant
  • A passive localization method of single-vector hydrophone based on array invariant

Examples

Experimental program
Comparison scheme
Effect test

specific Embodiment approach 1

[0042] Specific implementation mode one: combine figure 1 Illustrate this embodiment, a kind of single-vector hydrophone passive positioning method based on array invariant is specifically carried out according to the following steps:

[0043] Step 1. The sound pressure signal p(t) and the horizontal vibration velocity signal v received by the vector hydrophone r (t) Perform short-time Fourier transform to obtain the time-frequency distribution of sound pressure P(τ,f) and the time-frequency distribution of horizontal vibration velocity V r (τ,f);

[0044] Step 2. Using the time-frequency distribution P(τ, f) of the sound pressure and the time-frequency distribution V of the horizontal vibration velocity in the step 1 r (τ,f) to get the normal wave elevation angle Ambiguity plane with normal wave arrival time τ

[0045] Step 3. According to the normal wave pitch angle in step 2 Ambiguity plane with normal wave arrival time τ The method of array invariant is used to ...

specific Embodiment approach 2

[0046] Specific embodiment two: the difference between this embodiment and the specific embodiment one is: the sound pressure signal p (t) and the horizontal vibration velocity signal v received by the vector hydrophone in the step one r (t) Perform short-time Fourier transform to obtain the time-frequency distribution of sound pressure P(τ,f) and the time-frequency distribution of horizontal vibration velocity V r (τ,f); the specific process is:

[0047]

[0048]

[0049] In the formula, the data window function h(t) is defined as:

[0050]

[0051] In the formula, T is the window length, e is the natural constant, j is the imaginary unit, f is the frequency, t is the time, and τ is the time shift. .

[0052] Other steps and parameters are the same as those in Embodiment 1.

specific Embodiment approach 3

[0053] Specific embodiment three: the difference between this embodiment and specific embodiment one or two is: the time-frequency distribution P(τ, f) of the sound pressure in the step one and the time-frequency distribution V of the horizontal vibration velocity are used in the second step r (τ,f) to get the normal wave elevation angle Ambiguity plane with normal wave arrival time τ The specific process is:

[0054] According to the normal wave theory, the sound pressure P(r,z,f) and the horizontal vibration velocity V in the vector sound field in the shallow sea waveguide r (r,z,f) is expressed as follows:

[0055]

[0056]

[0057] In the formula, is the pitch angle of the nth normal wave, r is the horizontal relative distance between the target and the receiving point, z is the depth of the receiving point, z s is the target depth, Z n is the normal mode depth distribution function, μ n is the horizontal wave number, e is the natural constant, j is the imag...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention discloses a single-vector hydrophone passive positioning method based on array invariants. The method comprises steps that, short-time Fourier transform of a sound pressure signal p(t) and a horizontal vibration velocity signal vr(t) is carried out to obtain sound pressure time frequency distribution P(tau, f) and horizontal vibration velocity time frequency distribution Vr(tau, f); the sound pressure time frequency distribution P(tau, f) and the horizontal vibration velocity time frequency distribution Vr(tau, f) acquired in the first step are utilized to acquire a fuzziness plane R(tau, phi) of a normal wave pitching angle phi and a normal wave arriving time tau; target positioning is realized by utilizing the array invariant method according to the fuzziness plane R(tau, phi) of the normal wave pitching angle phi and the normal wave arriving time tau in the second step. Through the method, dependence on prior sea environment knowledge is reduced.

Description

technical field [0001] The invention belongs to the field of underwater acoustic positioning, in particular to a single-vector hydrophone passive positioning method based on array invariants. Background technique [0002] With the development of underwater acoustic positioning methods, passive positioning technology has a good application prospect in the military field due to its good concealment, and has attracted the attention and attention of underwater acoustic scholars all over the world for many years. On the one hand, with the continuous development of the working frequency band of the sonar system to low frequencies, the array aperture of the hydrophone array composed of conventional sound pressure hydrophones is getting larger and larger under the condition of maintaining a certain gain and beam width. This limits its application in practical engineering. On the other hand, the current mature passive positioning technology still faces many problems for the relative...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): G01S5/22
CPCG01S5/22
Inventor 师俊杰孙大军吕云飞兰华林梅继丹贵瑞晓
Owner HARBIN ENG UNIV