Method for using underwater acoustic channel statistics invariant features to achieve passive ranging

Abstract

The invention belongs to the field of underwater acoustic detection, and particularly discloses a method for using underwater acoustic channel statistics invariant features to achieve passive ranging. The method for using the underwater acoustic channel statistics invariant features to achieve passive ranging comprises the steps that passive detection is carried out on a target on the basis of double array elements, each array element carries out LOFAR analysis on a received target broadband noise signal, stripes of an LOFAR graph of the received target broadband noise signal are extracted through the edge extraction technologies such as HOUGH transformation to obtain a waveguide invariant and an estimated value of a parabola parameter, and distance information and target speed information of a CPA point of the target can be obtained. According to the method for using the underwater acoustic channel statistics invariant features to achieve passive ranging, passive detection is carried out on the basis of the waveguide invariant, and the method for using the underwater acoustic channel statistics invariant features to achieve passive ranging has good adaptive capacity to uncertain factors of the marine environment; due to the fact that a double-array-element model is adopted, a device is simple and convenient to use, the calculated amount is small, target movement parameter information can be calculated by using data of only two array elements, and passive detection of the target is achieved.

Description

technical field [0001] The invention relates to a method for realizing passive detection of a target based on a waveguide invariant and a dual-array element model, in particular to a method for realizing passive distance measurement by utilizing the statistically invariant characteristics of an underwater acoustic channel, belonging to the field of underwater acoustic detection. Background technique [0002] The detection of underwater targets has always been one of the key and difficult issues in the field of underwater acoustics. Based on the consideration of concealment, ranging sonar mostly uses passive methods. The sonar array collects and processes the target radiation noise to estimate the target distance. information. [0003] The main methods of passive detection include: (1) Three-point ranging method based on spherical wave or cylindrical wave front. (2) Target Motion Analysis (TMA: Target Motion Analysis) method based on target azimuth history, including pure az...

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Problems solved by technology

[0004] At present, the research on passive detection technology mainly focuses on the improvement of the above-mentioned methods for specific application environments, but the basic principles of the above-mentioned methods (1) to (4) are based on the assumption of plane waves and spherical waves, and do not use environmental information such as underwater acoustic channels. , method (5) uses environmental information to achieve passive detection based on acoustic field modeling, but the difficulty of obtaining and uncertainty of the actual underwater acoustic environment information greatly limits its practical use

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