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Generation method of multi-static sonar low-interception multi-address resolution signal

A technology of signal generation and low interception, applied in the directions of sound wave reradiation, instruments, and measuring devices, which can solve problems such as poor security, and achieve the effects of improving orthogonality, excellent interception performance, and excellent orthogonality

Active Publication Date: 2019-10-18
HARBIN ENG UNIV
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Problems solved by technology

[0002] Compared with the single-base sonar system, the multi-base sonar system has the advantages of high detection efficiency, large coverage, and flexible configuration. However, the multi-base sonar system also faces many problems such as poor security.

Method used

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  • Generation method of multi-static sonar low-interception multi-address resolution signal
  • Generation method of multi-static sonar low-interception multi-address resolution signal
  • Generation method of multi-static sonar low-interception multi-address resolution signal

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Embodiment Construction

[0033] combine Figure 4 , the multistatic sonar low intercept multiple address resolution signal generation process of the present invention comprises the following steps:

[0034] Step 1. According to the system and target parameters, calculate the maximum distance l of the frequency axis of the mutual coincidence function of the Costas signal under the Doppler constraint condition.

[0035] Step 2. According to system requirements, set strict orthogonality requirements for Costas signals between different transmitting bases|R cross (τ,ξ)|≤r L Relaxed Orthogonality Requirements for Internal Costas Signals with the Same Transmitter | R cross (τ,ξ)|≤r H , where R cross (τ,ξ) represents the cross-correlation coefficient of two Costas signals, τ and ξ represent the time delay in time domain and frequency domain respectively, r L is the satisfied cross-correlation coefficient of detection signals between different transmitting bases required by the system, r H is the satisf...

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Abstract

The invention provides a multi-base sonar low interception multi-access resolution signal generation method. The method comprise the steps: calculating the maximum distance of a mutual coincidence function frequency axis of a Costas signal; setting the strict orthogonality requirement of the Costas signal between different transmitting bases and the loose orthogonality requirement of the Costas signal in the same transmitting base; calculating a maximum mutual coincidence function matrix of all M-order Costas sequences; calculating a maximum mutual coincidence point number of Costas sequences in the transmitting bases and a maximum mutual coincidence point number of Costas sequences between the transmitting bases; selecting N groups of orthogonal Costas sequence sets from the Costas sequences and allocating the orthogonal Costas sequence sets to all the transmitting bases; adjusting system parameters, generating a suitable number of orthogonal NFM signals, and allocating the orthogonal NFM signals to all the transmitting bases; modulating the Costas sequences with the NFM signals, and calling all obtained detection signals by modulating as multi-base sonar low interception multi-access resolution signals. The method can guarantee that the detection signals are excellent in low interception performance and excellent in orthogonality, and can realize multi-access resolution.

Description

technical field [0001] The invention relates to a method for generating a sonar signal waveform, in particular to a method for generating a multibase sonar signal waveform. Background technique [0002] Compared with the single-base sonar system, the multi-base sonar system has the advantages of high detection efficiency, large coverage, and flexible configuration. However, the multi-base sonar system also faces many problems such as poor security. In addition, a multi-base sonar system can contain multiple transmitting bases at the same time, and the receiving base needs to distinguish multiple (transmitting) sites of the target echo signal in order to carry out follow-up work. Therefore, it is very necessary to design a detection signal with low intercept performance and multiple address resolution capability for multistatic sonar system. Contents of the invention [0003] The purpose of the present invention is to provide a multi-base sonar low-interception and multipl...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01S15/88G01S7/537
Inventor 芦嘉生雪莉石亚莉苍思远殷敬伟郭龙祥
Owner HARBIN ENG UNIV
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