Uniform linear array beam forming method based on time reversal

Abstract

The invention relates to a uniformed linear array beam forming method based on time reversal, belongs to the time reversal target directional technology of shallow sea multi-path channels, and relates to the field of time reversal and array signal processing. The uniformed linear array beam forming method based on the time reversal resolves the problem of uniform linear target direction under a strong noise interruption background. Due to the fact that the time reversal is capable of conducting cophasal stacking of multi-path signals based on transmission channel matching, energy for receiving signals is reinforced, consequently system gain of signal detection is improved, and therefore the time reversal has strong advantages of signal detection under a strong noise circumference, particularly under the background of shallow sea multi-path channels. Meanwhile, the application of the time reversal in the target direction field is perfected by self-adaptation beam forming of the uniform linear array, beam control can be conducted conveniently by the acquirement of an optimal weighting factor of each array element by using the uniform linear array under the target direction background, spatial filtering is conducted to a self-adaptation beam forming directional diagram, and thus purpose of precise orientation is achieved.

Description

technical field [0001] The invention belongs to the time-reversal target orientation technology of multi-path channel in shallow sea, relates to the field of time-reversal and array signal processing, in particular to a uniform linear array beam forming method based on time-reversal. Background technique [0002] Time feedback has become an extensive research topic in the field of signal detection, and Professor M. Fink of France has played a very good role in laying the foundation for this aspect. Based on the field of ultrasonic signal detection, the research team led by him proved the performance of time defocusing by combining theory and experiments, and derived three basic applications of time defocusing: iterative time defocusing can improve the effect of time defocusing, and selective focusing can be applied to Multi-target recognition and adaptive time-reversal focusing; the main achievement of time-reversal research in the field of underwater acoustics comes from Pr...

AI Technical Summary

Problems solved by technology

[0005] Kuperman's time-reversal target orientation technology was proposed indirectly under the strong signal background. Using the signal energy focusing characteristics corresponding to different depths to orient the target has higher accuracy, but under the condition of low signal-to-noise ratio, the time-reverse focusing characteristics will become worse and will resulting in large target orientation errors

The uniform linear array beamforming method always considers the direct path in signal propagation, because the time delay corresponding to the direct path will directly give the directional characteristics of the target, and for shallow sea multipath channels, its application has certain limitations

Images