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Active sonar identity reorganization method based on watermark

A digital watermarking and identification technology, applied in speech analysis, instruments, etc., can solve the problem that the identification ability needs to be further strengthened.

Inactive Publication Date: 2014-05-14
JIANGSU UNIV OF SCI & TECH
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Problems solved by technology

The identification ability of this method for such signals needs to be further strengthened

Method used

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  • Active sonar identity reorganization method based on watermark
  • Active sonar identity reorganization method based on watermark
  • Active sonar identity reorganization method based on watermark

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Embodiment Construction

[0074] Below in conjunction with specific example, further illustrate the present invention. Such as figure 1 shown. The digital watermark-based active sonar identification method of the present invention includes the following steps: 101 preprocessing the original signal, 102 embedding the watermark; 201 receiving information containing the watermark, 202 calculating the correlation, and 203 making a judgment based on the correlation value. 101, 102, and 103 are three steps of watermark embedding, and 201, 202, and 203 are three steps of watermark extraction.

[0075] Step 1: Watermark embedding.

[0076] (1) Preprocess the original signal (such as figure 2 shown).

[0077] Here the original chirp signal s(t) is divided into 20 blocks on average

[0078] s(t)=[s 1 (t),s 2 (t),...s 20 (t)] (1)

[0079] The length of each block m=N / n=2000 / 20=100. Perform discrete cosine transform (DCT) on the original signal s(t) after block:

[0080] S(f)=dct(s(t))=[S 1 (f),S 2 (...

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Abstract

The invention discloses an active sonar identity reorganization method based on a watermark. The active sonar identity reorganization method based on the watermark is different from existing active sonar identity reorganization methods which are achieved through the inherent features of active sonar detection signals. According to the active sonar identity reorganization method based on the watermark, the digital watermark is embedded into a detection signal sent by active sonar by a sender, and a receiver recognizes the identity of the signal by detecting whether the received signal contains watermark information; specifically, part of DCT coefficients in an original signal are modified by generating a watermark sequence at the sending end, whether the watermark is contained is determined at the receiving end by calculating the relevance between a watermark template and the received signal, and thus the identity of the sonar signal is recognized. Compared with existing methods, the active sonar identity reorganization method based on the watermark has the advantages of being more flexible, higher in controllability and better in reorganization effect.

Description

technical field [0001] The invention relates to active sonar, in particular to a digital watermark-based identification method for active sonar. Background technique [0002] In the complex seabed environment, there are a lot of acoustic signals. Some of these acoustic signals are produced by marine organisms, and many are artificially generated. The identities of these signals are difficult to distinguish, but in practical applications, it is very necessary to identify the identities of sonar signals. Since the active sonar pulse itself does not carry any identity information except the bandwidth, frequency, duration and pulse shape. Digital watermarking technology is currently a more effective identification method. Therefore, the present invention embeds the digital watermark in the signal emitted by the active sonar to achieve the purpose of identification. This technology has strong practical application requirements. For example, in actual operation, this technolog...

Claims

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Application Information

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IPC IPC(8): G10L19/018
Inventor 戴跃伟周海会王彪翟江涛
Owner JIANGSU UNIV OF SCI & TECH
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