Target detecting method of weighted robust broadband beam forming

Abstract

The invention relates to a target detecting method of weighted robust broadband beam forming. The target detecting method comprises theoretical analysis, theoretical derivation, numerical simulation, algorithm improvement and result verification, and comprises the following steps: according to the characteristic that radiated noise of an underwater target contains a high-strength steady line spectrum, utilizing the characteristics that an amplitude difference between a main lobe and a minor lobe of frequency unit beam forming of the line spectrum of the target is larger and steadier, and an amplitude difference between a main lobe and a minor lobe of frequency unit beam forming of the noise is smaller and more random, firstly optimizing each frequency band beam forming by a second-order cone so as to obtain high gain beam forming of a low side lobe; then forming a weighting factor by utilizing a difference between the main lobe and the minor lobe of each frequency unit beam forming; then performing weighting statistics on each frequency unit beam forming by utilizing the weighting factor. The target detecting method can restrain the interference of background noise energy, enhance the gain of the signal to noise ratio of the target detection, overcome the difficulties of four-dimensional display of detecting a traditional line spectrum, improve the properties of an energy accumulation detecting method for long-range target detection, and improve the robustness of general broadband beam forming.

Description

technical field [0001] The invention relates to the field of sonar signal processing, in particular to a weighted robust broadband beamforming target detection method. Background technique [0002] Because passive sonar does not radiate signals to the outside, it has strong concealment and has always been one of the important means to detect, locate, track and identify underwater targets. However, with the continuous improvement of noise reduction technology, the signal-to-noise ratio of passive sonar received data is continuously reduced, and the performance requirements for passive sonar are becoming more and more stringent. The detection technology commonly used in passive sonar—the energy accumulation detection method can no longer meet the needs of long-range target detection. Scholars have proved through theory and experiments that the radiated noise of underwater targets contains rich single-frequency components, especially in the low-frequency range. The rotation of...

AI Technical Summary

Problems solved by technology

The detection technology commonly used in passive sonar—the energy accumulation detection method can no longer meet the needs of long-range target detection.

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