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Random pulse removing method suitable for extracting stable features of one-dimensional sonar range profile

A chaotic pulse and feature extraction technology, applied in radio wave measurement systems, instruments, etc., to solve problems such as adaptive beamforming and other algorithms that cannot converge

Inactive Publication Date: 2015-11-25
HOHAI UNIV
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  • Claims
  • Application Information

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Problems solved by technology

The main reason is that the arrival airspace of such cluttered sound pulses may come from different directions, causing algorithms such as adaptive beamforming to fail to converge

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  • Random pulse removing method suitable for extracting stable features of one-dimensional sonar range profile
  • Random pulse removing method suitable for extracting stable features of one-dimensional sonar range profile
  • Random pulse removing method suitable for extracting stable features of one-dimensional sonar range profile

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Embodiment Construction

[0028] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.

[0029] figure 1 It is a schematic flow chart of an embodiment of a method for removing random pulses suitable for sonar one-dimensional range image stable feature extraction provided by the present invention, such as figure 1 shown, including:

[0030] S101. The sonar transmits a periodic chirp continuous wave signal and receives an echo signal, wherein the echo signal includes random pulses and echo pulses formed after the chirp signal is reflected by an object. ...

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Abstract

The invention discloses a random pulse removing method suitable for extracting stable features of a one-dimensional sonar range profile. The method comprises: S101, transmitting periodic linear frequency modulation continuous wave signals and receiving echo signals by a sonar; S102, performing Stretch processing on the echo signals to obtain frequency domain echo signals; S103, performing threshold detection on the frequency domain echo signals to screen N1 frequency points passing a first threshold value; S104, repeating S103 to screen other N2 frequency points passing the first threshold value; and S105, comparing the elements in W and U in one-to-one correspondence, and if the absolute value of the both is smaller than or equal to a second threshold value and the ratio of Si / p is greater than a third threshold value, judging object echo, otherwise, judging the remaining values as random pulse. The method can be used for removing random pulse from the signals received by the sonar.

Description

technical field [0001] The invention relates to the technical field of sonar, in particular to a method for removing random pulses suitable for extracting stable features of a sonar one-dimensional range image. Background technique [0002] Sonar systems are often affected by a variety of cluttered sound pulses, which have a strong impact on sonar echo detection, making it impossible to complete object detection. This is because conventional sonar uses technologies such as adaptive beamforming, which are not suitable for processing cluttered sound pulses. The main reason is that the arrival airspace of such cluttered sound pulses may come from different directions, causing algorithms such as adaptive beamforming to fail to converge. Therefore, new methods need to be developed to remove the noise pulses. Contents of the invention [0003] The technical problem to be solved by the present invention is to provide a method for removing clutter pulses for the frequency inform...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S7/52G01S7/527
CPCG01S7/52001G01S7/5273
Inventor 王峰蒋德富
Owner HOHAI UNIV