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Sending-receiving combining composite double-ellipsoid spiral line array

A technology of helix and double ellipsoid, which is applied in the field of sending-retracting composite double ellipsoid helical array, which can solve the problems of inapplicability of free field model, distortion, and no longer maintaining the shape of the transmitted waveform.

Inactive Publication Date: 2015-04-29
ZHEJIANG UNIV
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Problems solved by technology

[0003] Due to the influence of the upper and lower interfaces and the uneven sound velocity, sound waves propagate in multiple paths in the ocean environment, and the waveform received by the array is the multipath delay-weighted sum of the transmitted waveform, which no longer maintains the shape of the transmitted waveform, and there is distortion, so the free field model not applicable

Method used

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  • Sending-receiving combining composite double-ellipsoid spiral line array
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  • Sending-receiving combining composite double-ellipsoid spiral line array

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[0056] Such as figure 1 and figure 2 As shown, with the number of transmitting array elements N=8, K T =4 / 3, vertical aperture H of the emission array T =0.8m, horizontal aperture W T =0.6m, initial azimuth φ 0 =11.25°; the Cartesian coordinates of each receiving array element is the number of receiving array elements M=8, K R =34 / 30, vertical aperture H of the emission array R =0.34m, horizontal aperture W R =0.3m, the initial azimuth angle of the i-th sub-array is φ i0 =i*8.4375° is taken as an example to design the three-dimensional formation of the present invention.

[0057] (1) The numbers of the CDSLA transmitting elements are as follows: the numbers of the first SLA are: T1, T3, T5, T7, and the numbers of the second SLA are T2, T4, T6, T8.

[0058] (2) The ellipsoid surrounded by the helix of the DSLA sub-array, the vertical semi-major axis c T =H T *(N+1) / (N-1) / 2=0.5143m, the two horizontal semi-axes are equal, a T =W T / 2=0.3m.

[0059] (3) The azimuth ...

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Abstract

The invention discloses a sending-receiving combining composite double-ellipsoid spiral line array which is formed by two spiral line sub-arrays spirally surrounding the ellipsoidal surface for two circles. Each sub-array is a double-ellipsoid spiral line array, emitting array elements are located in the centers of the sub-arrays, and each receiving array element is formed by two curved arrays spirally surrounding the ellipsoidal surface for two circles. The array has the following advantages that a vertical aperture and a horizontal aperture are achieved; the emitting capacity is achieved, and the receiving capacity is achieved; emitting and receiving are combined and belong to the same array in position; the emitting array elements and the receiving array elements are separated; the number of the emitting array elements is smaller than that of the receiving array elements, the emitting array elements and the receiving array elements differ in one proportion, and the proportion is the number of the receiving array elements of each sub-array; the array is hollowed out, the array elements are small as far as possible, and the array elements and an array frame are exquisite in structure; the CDSLA provides a basis for emitting-receiving interaction processing.

Description

technical field [0001] The invention belongs to the technical field of underwater acoustic signal processing, and relates to a three-dimensional array design for acoustic signal transmission and reception in a marine environment, in particular to a composite double ellipsoid helical array for transmitting-retracting. Background technique [0002] The ocean environment is a constrained waveguide environment that faces the sea surface, connects to the bottom of the sea, and contains non-uniform sound velocity. It has three-dimensional characteristics. A three-dimensional field collectively represented by z Cartesian coordinates. The use of spatial broadband hydrophone arrays to transmit and receive acoustic signals can not only focus the acoustic energy on the desired target, reduce the reverberation produced by other scatterers, but also complete the effective reception of acoustic signals to achieve target direction finding , distance and depth measurement. [0003] Due to...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S7/52
CPCG01S7/52
Inventor 赵航芳
Owner ZHEJIANG UNIV
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