Uniform linear array beam forming method based on time reversal

A uniform line, time-reversal technology, applied in radio wave measurement systems, sound wave re-radiation, diversity/multi-antenna systems, etc. Improve system gain and enhance the effect of energy

Inactive Publication Date: 2013-05-08
NORTHWESTERN POLYTECHNICAL UNIV
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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 wor

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  • Uniform linear array beam forming method based on time reversal
  • Uniform linear array beam forming method based on time reversal
  • Uniform linear array beam forming method based on time reversal

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Embodiment

[0066] The waveguide environment adopted is a layered shallow sea environment with distance-dependent and uniform sound velocity, such as figure 2 As shown, it consists of water layer and seabed sand layer. The speed of sound in the water layer c 1 =1500m / s, density ρ 1 =1000kg / m 3 ; the speed of sound in the sand layer c 2 =1600m / s, density ρ 2 =1600kg / m 3 . Target T(1000, 50m), uniform line array {s 1 …s 11}The deployment depth is 50m~62m. Since the accompanying energy loss, especially the absorption of the sand layer, makes it impossible for sound ray propagation to continuously pass through multiple reflections on the seabed, only one reflection is considered here, that is, the 0-span model in the classical ray theory, and the environment remains unchanged during the simulation.

[0067] Proceed as follows:

[0068] 1) with a uniform line array {s 1 …s N} array element s a The transmitted signal for the reference array element is u(t), then the target receive...

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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...

Claims

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Application Information

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IPC IPC(8): G01S15/02H04B7/08
Inventor 王海燕杨伏洲申晓红闫永胜何轲赵瑞琴李保军顾江建吕国飞花飞李双全白卫岗
Owner NORTHWESTERN POLYTECHNICAL UNIV
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