Passive sonar underwater weak target detection method and system

Abstract

The invention discloses a passive sonar underwater weak target detection method and system. The method comprises the following steps: acquiring multi-frame receiving data in a set time period; performing angle estimation on each frame of receiving data to obtain a time azimuth history graph; screening candidate azimuth points of each frame of image in the time azimuth history graph according to the magnitude of the energy values to obtain a space-time azimuth graph; calculating an angle distance between candidate azimuth angle points of every two adjacent frames of images in the space-time azimuth graph, predicting an angle track of the target based on the angle distance and a linear function fitting algorithm, and determining a motion track; if the number of the motion track is one, determining the motion track as a final angle track of the target; if the number of the motion tracks is multiple, calculating the track credibility of each motion track, and determining the motion track with the maximum track credibility as the final angle track of the target. According to the method, the false alarm probability can be reduced while missing detection is avoided, so that the stability of underwater weak target detection is improved.

Description

technical field [0001] The invention relates to the field of underwater acoustic signal processing, in particular to a passive sonar underwater weak target detection method and system. Background technique [0002] The ocean covers most of the earth, and the military and economic significance of the ocean is very important. Militarily, control of the sea is a critical factor in the success or failure of modern high-tech warfare, especially for coastal states. For the control of the ocean, the most important point is the control of underwater information, which is the most important condition for the operation and decisive victory of submarine warfare and anti-submarine warfare. Whoever has an advantage in underwater information control will win the greatest victory in future naval battles. Underwater acoustic technology is one of the most basic and important factors in underwater information warfare. Submarine warfare and anti-submarine warfare are inseparable from underwa...

AI Technical Summary

Problems solved by technology

[0004] At present, the detection of underwater weak targets is usually achieved by one or several frames of data, but under the condition of low signal-to-noise ratio, there is great uncertainty in detecting targets only by one or several frames of data, which will lead to missed detection , The problem of increased false alarm probability, poor detection stability

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