A Classification and Recognition Method for Surface and Underwater Targets Based on Target Voyage Depth

Abstract

The invention discloses a water surface and underwater target classification and recognition method based on target flight depth, and belongs to the technical field of underwater target recognition. This method is mainly to set up the upper detection unit and the lower detection unit in the vertical direction of the water surface. The targets are divided into two types: surface targets or underwater targets; The target radiated acoustic signal s2(t) is obtained, and the time delay τ12 between the two is obtained by the correlation method; the calculated target flight depth interval is [d2,d1], and d1 and d2 are the upper limit and lower limit of the target flight depth interval ; Finally, classify the target according to the target flight depth interval [d2,d1] calculated in step 2. The method can adapt to the relative position change between the upper and lower detection units caused by environmental factors such as ocean currents, and has high recognition accuracy and wide application range.

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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