Water surface and underground target classification and identification method based on target navigation depth

Abstract

The invention discloses a water surface and underground target classification and identification method based on the target navigation depth and belongs to the technical field of underwater target identification. The method mainly includes the steps that an upper detection unit and a lower detection unit are arranged in the perpendicular direction of a water surface, and targets are divided into water surface targets and underwater targets; the time delay Tau12 between a target radiation sound signal s1 (t) received by the upper detection unit and a target radiation sound signal s2 (t) received by the lower detection unit is solved through a correlation method; the target navigation depth zone is [d2, d1], and d1 and d2 are the upper limit and the lower limit of the target navigation depth zone; finally, the targets are classified according to the target navigation depth zone [d2, d1] calculated through the second step. The method can adapt to the changing condition, caused by environment factors such as ocean currents, of the relative position between the upper detection unit and the lower detection unit, the recognition accuracy is high, and the application range is wide.

Description

technical field [0001] The invention relates to the technical field of underwater target recognition, in particular to a classification and recognition method for water surface and underwater targets based on target flight depth. Background technique [0002] The classification and recognition method of surface targets and underwater targets based on underwater acoustic passive detection has always been one of the important issues in the field of underwater target recognition technology. It is used in large-scale underwater target detection systems with functions such as target positioning and tracking. The existing technology is mainly based on the frequency domain characteristics of target radiation noise to identify surface targets and underwater targets. Generally, it is difficult to apply directly, and the recognition accuracy is low, so it needs to be relearned. The method for identifying surface targets and underwater targets based on the target flight depth is less...

AI Technical Summary

Problems solved by technology

This method requires that the distance between the upper and lower detection units must be large enough (the detection accuracy is proportional to the distance between the two detection units), and the relative position between the two needs to be known precisely, so that this method is In practical applications, it is easy to be limited by the use conditions and environmental conditions, and there are difficulties in implementation, high cost and even impossible implementation. For example, the greater the distance between the upper and lower detection units, the realization of their underwater mooring, Anchoring and communication will become more complicated. It is not only difficult to use rigid connection between the two, but also difficult to use cable communication; when the two are connected in a commonly used flexible way, the ocean current will cause deviation and drift. distance, causing changes in the relative position between the upper and lower detection units, and the relative position is generally difficult to measure or known precisely

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