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Estimation Method of Vector Hydrophone Envelope Spectrum Based on Frequency Selection

A technology of vector hydrophone and envelope spectrum, which is applied in the direction of vibration measurement, instruments, and measuring devices in fluids, and can solve problems such as inaccurate extraction of envelope spectrum

Active Publication Date: 2021-07-09
HARBIN ENG UNIV
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  • Summary
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  • Claims
  • Application Information

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Problems solved by technology

[0004] The present invention is to solve the problem of inaccurate extraction of the envelope spectrum of ship radiated noise, and now provides a vector hydrophone envelope spectrum estimation method based on frequency selection

Method used

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  • Estimation Method of Vector Hydrophone Envelope Spectrum Based on Frequency Selection
  • Estimation Method of Vector Hydrophone Envelope Spectrum Based on Frequency Selection
  • Estimation Method of Vector Hydrophone Envelope Spectrum Based on Frequency Selection

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specific Embodiment approach 1

[0058] Specific implementation mode one: refer to Figures 1 to 3 Specifically illustrate this embodiment, the vector hydrophone envelope spectrum estimation method based on frequency selection described in this embodiment, comprises the following steps:

[0059] Step 1: Use the vector hydrophone to collect the acoustic signal radiated by the target to be measured at the same point. The vector hydrophone is anchored at a depth of about 40 meters underwater in the form of a submerged mark, and the depth of the sea area where the vector hydrophone is located is 80 meters. rice;

[0060] The acoustic signal includes one sound pressure signal p(n) and two vibration velocity signals v x (n) and v y(n), 0<n<Q, Q is the number of samples of each signal, and the directions of the two vibration velocity signals are located on the same horizontal plane and are perpendicular to each other.

[0061] Step 2: Install a compass directly below the vector hydrophone, the compass rotates syn...

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Abstract

A method for estimating the envelope spectrum of a vector hydrophone based on frequency selection relates to the field of ship target recognition. The invention aims to solve the problem of inaccurate extraction of the envelope spectrum of ship radiation noise. According to the vector hydrophone envelope spectrum estimation method based on frequency selection of the present invention, the frequency band of the ship radiation noise signal is optimized, and the window function method is used to construct a finite impulse response filter, thereby obtaining high-signal Envelope spectrum analysis is performed on the target signal with noise ratio to obtain an accurate envelope spectrum.

Description

technical field [0001] The invention belongs to the field of ship target identification, in particular to an estimation method of ship envelope spectrum. Background technique [0002] The envelope spectrum feature is the main basis for the ship to identify the target. In the prior art, the extraction methods of ship envelope spectrum features mainly include absolute value method, square method and so on. The performance of envelope spectrum feature extraction mainly depends on the signal-to-noise ratio of ship target radiation noise in the analysis frequency band. Therefore, how to optimize the frequency band of the ship radiation noise signal and design the corresponding filter to obtain the envelope spectrum analysis of the target signal with high SNR becomes the key to obtain a clear envelope spectrum. In addition, when the received ship radiated noise is interfered by ship noise from other directions, the performance of envelope spectrum feature extraction drops sharpl...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01S3/86G01H3/00
CPCG01H3/00G01S3/86
Inventor 吕云飞兰华林梅继丹靳建嘉刘鑫滕婷婷
Owner HARBIN ENG UNIV