Deep sea broadband target depth estimation method based on stripe interference structure

Abstract

The invention relates to a deep sea broadband target depth estimation method based on a fringe interference structure, which comprises a vertical linear array and is conducive to the extraction of thebroadband interference fringe structure. The deep sea broadband target depth estimation method provided by the invention has the benefits that first, the vertical linear array is laid in water, and abroadband signal transmitted by a motion target is received; meanwhile, in an experimental environment, the simulation of interference strip structures with different sound source depths is performedby utilizing a sound field model, experiment and simulated interference fringe tracking are performed by utilizing an extended Kalman filter, tracked fringe position and quantity information is substituted into a cost function, and the cost function is minimized; at this moment, the corresponding sound source depth is a target estimation depth. The deep sea broadband target depth estimation method provided by the invention has the following advantages that the complex sound field model calculation is not needed; an array beam is utilized for output, so that the signal-to-noise ratio is improved; the robustness is good, and the change along with the environment is small; a hydrophone is positioned at the bottom of a sea and is convenient to lay; a submersible beacon can stably work for a long time.

Description

technical field [0001] The invention belongs to the fields of underwater acoustic engineering, marine engineering, sonar technology and the like, and relates to a method for estimating the depth of a deep-sea broadband target based on a fringe interference structure, which is suitable for positioning a broadband moving target with a depth less than 1000 meters in a deep-sea environment. Background technique [0002] Passive localization of targets is one of the hot issues in underwater acoustic research in recent years. The positioning methods widely used in sonar systems include matching field positioning technology, methods based on normal wave models, positioning methods based on multi-path arrival structures, and positioning methods based on interference fringes. Their characteristics are: (1) Matching field processing utilizes ocean environment parameters and acoustic propagation channel characteristics, requires sufficient sampling of the acoustic field, and requires t...

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Problems solved by technology

The waveguide invariant theory is widely used in the shallow sea environment, but in the deep sea environment the waveguide invariant changes with the signal center frequency, mode and the relative position of the sound source-receiving point, so the application research on the waveguide invariant in the deep sea environment less

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