A Model-Based Method for Automatic Explosion Wave Interception in Ocean Acoustic Propagation Survey

Abstract

The invention discloses an automatic ocean acoustic propagation survey explosive wave intercepting method based on a model. The method includes the steps of throwing an explosive sound source for a transmission ship according to the measuring line underway, receiving the acoustic propagation measurement experiment configuration of signals at a fixed point through a perpendicular receiving array, conducting high-pass filtering on received data before processing according to the frequency spectrum characteristics of noise and explosive waves, forecasting acoustic propagation loss values of different transmitting-receiving array distances through the model, estimating the energy values of explosive wave signals received in positions of different transmitting-receiving array distances in experiments through the combination with explosive wave sample energy statistic values actually received in near-distance positions, designing detection thresholds changing according to the transmitting-receiving array distance changes, making the thresholds of the positions close to a transmitting-receiving array high and the thresholds of the positions away from the transmitting-receiving array low, and lowering the false alarm probability as much as possible under the condition that the detection probability is ensured. By means of the method, explosive waves can be effectively and automatically intercepted, and the method has important significance in automatically processing acoustic propagation measurement experiment data and lowering the manual intervention.

Description

technical field [0001] The invention belongs to the field of underwater transient signal detection, in particular to a model-based method for automatically intercepting explosion waves in ocean acoustic propagation investigation. Background technique [0002] The investigation and research on the energy attenuation characteristics of underwater acoustic channels in relevant sea areas is not only the basis for the study of the physical laws of underwater acoustic channels, but also provides a basis for the design and development of sonar equipment. With the development of ocean acoustic surveys, it can be seen that its development trend is: the elements of ocean acoustic surveys are more and more, more and more refined, and the amount of data is increasing, so the requirements for data processing technology are also increasing. high. [0003] The detection and interception of explosion sound signals are the key factors to realize high-efficiency data processing. Traditional...

AI Technical Summary

Problems solved by technology

However, since a survey line usually spans tens to hundreds of kilometers, there are 3 to 5 magnitude changes in signal energy, resulting in a change in the signal-to-noise ratio of tens of decibels. When the array distance is large, the explosion wave energy attenuation is large and the signal-to-noise ratio is low, resulting in high false positives

If the threshold value is lowered, when the transmit-receive distance is small, and due to the existence of pulse-like interference, high false alarms will result

Therefore, a single threshold is difficult to meet the requirements of low false alarm probability at short distances and high detection probability at long distances in the marine environment. It is necessary to adopt an adaptive energy detection threshold that changes with the distance. Increase the threshold to effectively reduce false alarms caused by pulse-like noise, and lower the threshold at far distances from the transmitter-receiver array to effectively increase the detection probability of explosive waves

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