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A low-beam sidelobe mimo sonar array with optimal rotation angle

A technology of rotation angle and formation, applied in the direction of sound wave reradiation, radio wave measurement system, instrument, etc., can solve the problem that it is difficult to apply small platforms, and achieve the effect of reducing the side lobe level

Active Publication Date: 2019-12-20
NORTHWESTERN POLYTECHNICAL UNIV
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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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  • A low-beam sidelobe mimo sonar array with optimal rotation angle
  • A low-beam sidelobe mimo sonar array with optimal rotation angle
  • A low-beam sidelobe mimo sonar array with optimal rotation angle

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Embodiment Construction

[0046] In order to describe content of the present invention conveniently, at first do following term definition:

[0047] Definition 1. Rotation angle: see Figure 4 , first establish a planar Cartesian coordinate system xOy on the plane where the transmitting circular array is located, define the position where the center of the transmitting circular array is located as the origin O, and select an element of the transmitting circular array as the first one of the transmitting array For the array element, take the line connecting the origin and the geometric center of the first array element of the transmitting array as the Ox axis, and stipulate that the direction from the origin O to the geometric center of the first array element of the transmitting array is the positive direction of the x-axis, vertical The straight line on the Ox axis is the Oy axis. The normal line of the xOy plane is used as the Oz axis, and the space Cartesian coordinate system xOyz is established, a...

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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 array and a method for obtaining an optimal rotation angle and determining an optimal array. Background technique [0002] In order to obtain a 360° viewing angle, active sonar usually adopts the formation of single array element emission and multi-element ring array reception, such as aviation pendant sonar (Zhi Shaolong, Liu Ying, Liu Ying, Zhang Hong. FLASH pendant sonar Acoustic performance and unidirectional array element verification. The 2015 Academic Conference of the Underwater Acoustics Branch of the Acoustical Society of China, 2015). Sonars using this formation can be simplified as single-input multiple-output (SIMO) sonars. Since the uniform circular array is used to receive the echo of the target scene, there will be a problem that the array beam side lobe is at a high level. When the array structure remains unchang...

Claims

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Application Information

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Patent Type & Authority Patents(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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