Method for forecasting echo characteristics of underwater high-speed moving target

Abstract

The invention relates to the technical field of acoustics, and discloses an underwater high-speed moving target echo characteristic forecasting method, which comprises the following steps of: introducing an initial incident plane wave value of a moving target into a laboratory reference system K; calculating an incident plane wave value by adopting a stationary target time domain plate element method; converting the scattering time domain echo value of each surface element in the laboratory reference system K in the step 2 into an inertial reference system K '; and superposing the scattering time domain echo values of the surface elements to obtain a scattering time domain waveform simulation result of the moving target. Compared with a traditional quasi-static approximation method, the method has the advantages that the expansion and contraction effect of echo envelope, Doppler frequency shift in the pulse and distance change caused by target movement in sound wave propagation time are considered, and the echo characteristics of the underwater high-speed moving target can be quickly and accurately forecasted; and theoretical support is provided for verifying the echo time-frequency domain characteristics of the underwater high-speed target and improving the recognition capability of the underwater monitoring sonar on the high-speed target.

Description

technical field [0001] The invention relates to the technical field of acoustics, in particular to a method for predicting echo characteristics of underwater high-speed moving targets. Background technique [0002] The echo of underwater targets is the information source of active sonar work, which is of great significance and engineering application value for active sonar detection and identification. The research results have been applied to the development, detection and identification of active sonar. Generally, the research on acoustic scattering of underwater targets focuses on stationary targets. However, most of the targets detected by sonar are non-stationary, and their translation process will also be accompanied by rotation. , vibration, etc., such as high-speed submarines, unmanned submersible UUVs, torpedoes, mines and their high-speed rotating propellers, vibrating outer casings, etc. These movements first cause changes in target attitude, instantaneous speed, ...

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Problems solved by technology

[0002] The echo of underwater targets is the information source of active sonar work, which is of great significance and engineering application value for active sonar detection and identification. The research results have been applied in the development, detection and identification of active sonar. Generally, the research on sound scattering of underwater targets is focused on stationary targets. However, most of the targets detected by sonar are non-stationary, and they will also be accompanied by rotation during the process of translation. , vibration, etc., such as high-speed submarines, unmanned submersibles UUV, torpedoes, mines, and their high-speed rotating propellers, vibrating outer casings, etc. These movements first cause changes in the target attitude, instantaneous speed, etc., so that the target echo The waveform, amplitude and frequency of the sound change. At present, the relevant research at home and abroad mainly focuses on the sound scattering of low-speed moving targets, and generally adopts the "quasi-static" approximation method, and there are few related literature and echo simulation methods related to the sound scattering characteristics of high-speed moving targets. , so there is an urgent demand for the prediction method of the echo characteristics of underwater high-speed moving targets

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