Subaqueous target wake detection system and method based on laser wave front change

Abstract

The invention discloses a detection system of a dynamic target trail in water based on laser wavefront change and a method thereof. The detection system comprises a laser, a Hartmann wavefront sensor and a signal processing system. The method comprises the following steps: the detection system is placed in the water; the laser is used for generating Gaussian beams; the Hartmann wavefront sensor is used for receiving and detecting the wavefront information of laser beams after passing through a water area to be detected; and the signal processing system is used for processing the wavefront information on a real-time basis and outputting wavefront distortion magnitude to detect the dynamic target trail in the water. The detection process comprises the following steps: measuring the wavefront distortion magnitude of the laser beams for more times under laboratory conditions and giving a judging criterion on the existence of the target trail; and measuring the wavefront distortion magnitude of the laser beams in the actual water area on a real-time basis and comparing with the judging criterion; and finally judging that the target trail exists if the wavefront distortion magnitude is larger than that of the judging criterion, and the target trail does not exist if the wavefront distortion magnitude is not larger than that of the judging criterion. The invention has the advantages of high detection accuracy and longer detection distance and can be used for remotely and accurately detecting surface ships and underwater vehicles.

Description

technical field [0001] The invention belongs to the application field of laser technology and relates to the detection of dynamic target wakes, in particular to a detection system and method for the wakes of dynamic targets in water, which can be used for surface ship tracking, underwater dynamic target detection, underwater weapon self-guided and underwater Aircraft design. Background technique [0002] With the development of marine resources and the increasing awareness of coastal defense in various countries, the detection and tracking of dynamic targets in seawater has become an important research topic. In addition to the traditional acoustic detection methods, underwater detection methods include optical detection methods, infrared detection methods and electromagnetic detection methods. [0003] Acoustic detection is divided into active acoustic detection and passive acoustic detection according to whether the detection device emits an acoustic signal, and is divide...

AI Technical Summary

Problems solved by technology

However, due to the absorption and scattering of the laser light by air bubbles and impurities in the water, the laser intensity fluctuates greatly, so the method of detecting targets by using light intensity changes has poor accuracy and cannot be used practically.

However, the method of using the scattering characteristics of light to detect the target will have the problem of being unable to detect the light scattering space spectrum when there are few bubbles or only turbulent flow in the target trail, and it cannot meet the long-distance detection of the detection target.

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