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Low wave beam sidelobe MIMO sonar formation having optimal rotation angle

A rotation angle and side lobe technology, applied in the re-radiation of sound waves, radio wave measurement systems, and the use of re-radiation, etc., can solve problems such as difficulty in applying small platforms, and achieve the effect of reducing the side lobe level

Active Publication Date: 2017-10-20
NORTHWESTERN POLYTECHNICAL UNIV
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  • Abstract
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  • Claims
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Problems solved by technology

However, the MIMO sonar designed in this way is easy to break through the size constraints of the array, making it difficult to apply to small platforms

Method used

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  • Low wave beam sidelobe MIMO sonar formation having optimal rotation angle
  • Low wave beam sidelobe MIMO sonar formation having optimal rotation angle
  • Low wave beam sidelobe MIMO sonar formation having optimal rotation angle

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Embodiment Construction

[0046] In order to facilitate the description of the content of the present invention, first define the following terms:

[0047] Definition 1. Rotation angle: see Figure 4 , First establish a plane rectangular coordinate system xOy on the plane where the launching ring array is located, define the position of the center of the launching ring array as the origin O, and choose one element of the launching ring array as the first one of the launching array Array element, take the line connecting the origin and the geometric center of the first element of the launching array as the Ox axis, and specify the direction from the origin O to the geometric center of the first element of the launching array as the positive direction of the x-axis, perpendicular The straight line on the Ox axis is the Oy axis. The normal of the xOy plane is taken as the Oz axis, and the space rectangular coordinate system xOyz is established. The positive direction of the z-axis and the positive direction ...

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Abstract

The invention relates to a low wave beam sidelobe MIMO sonar formation having an optimal rotation angle. Radiuses of emission and reception circular arrays and array element quantities of the two are constrained in a certain scope, according to existing cost budget and dimensions provided by a platform, the proper array radiuses and the proper array element quantity are selected in the scope, the optimal rotation angle of the emission and reception circular arrays is calculated on the basis, and thereby the low wave beam sidelobe MIMO sonar formation having the optimal rotation angle is acquired.

Description

Technical field [0001] The invention belongs to the field of array signal processing, and in particular relates to a low-beam sidelobe MIMO sonar formation and a method for obtaining an optimal rotation angle to determine the optimal formation. Background technique [0002] In order to obtain a 360° viewing angle, active sonar usually adopts a single-element transmission and a multi-element circular array reception, such as aerial dipping sonar, etc. (Zhi Shaolong, Liu Ying, Liu Ying, Zhang Hong. FLASH dipping sonar Acoustic performance and verification of unidirectional array elements. China Acoustic Society Underwater Acoustics Branch 2015 Academic Conference, 2015). The sonar using this formation can be simplified to a single-input multiple-output (SIMO) sonar. Since a uniform circular array is used to receive the target scene echo, there will be a problem that the side lobes of the array beam are at a higher level. When the array structure is unchanged, in order to suppress...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S7/521G01S7/52G01S15/02
CPCG01S7/52003G01S7/521G01S15/02
Inventor 刘雄厚邓若凡孙超蒋光禹樊宽
Owner NORTHWESTERN POLYTECHNICAL UNIV
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