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

An underwater acoustic channel and passive ranging technology, applied in the direction of using re-radiation, measuring devices, radio wave measuring systems, etc., can solve the problems of no environmental information, limitations, uncertainties, etc., and achieve the effect of improving the ranging accuracy

Inactive Publication Date: 2014-01-01
HOHAI UNIV CHANGZHOU
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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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  • Method for using underwater acoustic channel statistics invariant features to achieve passive ranging
  • Method for using underwater acoustic channel statistics invariant features to achieve passive ranging
  • Method for using underwater acoustic channel statistics invariant features to achieve passive ranging

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Embodiment 1

[0026] Such as figure 1 and 2 As shown, the device of the present invention based on the theory of waveguide invariants and adopting the dual array element model for passive ranging method includes two receiving hydrophones at the A and B array elements. When the target moves at a constant speed in a certain direction, the two receiving hydrophones The receiving hydrophone respectively receives the broadband acoustic signal from the target, and analyzes the power spectrum of the received signal at each discrete time t, that is, obtains a slice parallel to the horizontal axis (frequency f axis) on the LOFAR diagram, and the time of the slice The process is integrated into a LOFAR graph ( image 3 ). When the signal-to-noise ratio is high, a single hydrophone can measure LOFAR images with clear interference fringes; for remote targets, when the signal-to-noise ratio is low, array signal processing must be performed, and LOFAR analysis of the tracking beam output can be obtaine...

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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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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S11/14
CPCG01S11/14
Inventor 李建唐凯韩庆邦殷澄朱昌平单鸣雷高远
Owner HOHAI UNIV CHANGZHOU
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