Multi-static sonar multi-access resolution signal generation method with low intercept characteristics

Abstract

The invention provides a method for generating a multi-base sonar multi-address distinguishing signals having low-interception-probability characteristics. The method comprises the steps that 1, mutual overlapping function frequency-axis maximum distances of Costas signals under the Doppler constraint condition are calculated; 2, the strict orthogonality requirements of the Costas signals of different transmitting bases and loose orthogonality requirements in the Costas signals of the same base are set; 3, the maximum mutual overlapping function matrix of the M-order Costas sequences is calculated; 4, the maximum mutual overlapping point number of the Costas sequences in the transmitting bases and the maximum mutual overlapping point number of the Costas sequences among the transmitting bases are calculated; 5, N groups of orthogonal Costas sequences sets are selected from the Costas sequences and are allocated to the transmitting bases; 6, a proper number of orthogonal LS codes are constructed and allocated to the transmitting bases; 7, Costas_LS codes are obtained. It can be ensured that detection signals have excellent low-interception probability, the detection signals among different transmitting bases have excellent orthogonality, and meanwhile the orthogonality of the detection signals in the same transmitting bases is improved.

Description

Technical field [0001] The invention relates to a method for generating a sonar signal waveform, in particular to a method for generating a multistatic sonar signal waveform. Background technique [0002] In underwater monitoring networks and underwater acoustic countermeasures, sonar is a key technology in target detection, recognition, classification, positioning and tracking. Active sonar is widely used in the field of underwater acoustic detection because of its high reliability and good positioning performance. Facing the increasingly complex underwater acoustic detection environment, how to accurately detect targets has become an important issue in the design of sonar signal waveforms. Therefore, the design of low intercept sonar signals has become a hot issue in recent years. [0003] The goal of sonar low intercept signal design is to maintain or increase the receiver processing gain, while making the active signal chaotic on the time axis and frequency axis, increasing th...

AI Technical Summary

Problems solved by technology

For LS codes, when the multipath spread of the channel is smaller than the width of the zero-correlation window, its optimal multi-user receiver, decorrelation multi-user receiver and matched filter single-user receiver are equivalent; When the path extension is greater than the width of the zero-correlation window, the single-user receiver with a matched filter will suffer a large loss of capacity

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