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Target detection method based on distributed phased-mimo joint processing

A joint processing and target detection technology, applied in the field of target detection and underwater acoustic target detection, can solve the problems of slow development of MIMO technology

Active Publication Date: 2016-03-23
ZHEJIANG UNIV
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

However, due to the time delay and Doppler double spread of the underwater acoustic channel, the development of MIMO technology in the field of sonar is relatively slow.

Method used

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  • Target detection method based on distributed phased-mimo joint processing
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  • Target detection method based on distributed phased-mimo joint processing

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Embodiment Construction

[0029] The inventive method comprises the steps:

[0030] 1) Arrange M transmitting sub-arrays at the transmitting end, numbered 1,...,M, where M is a positive integer greater than or equal to 1. The kth (k=1,2,...,M) transmitting sub-array contains M k Transmitting transducer array elements, numbered 1,2,...,M k ,M k is a positive integer greater than or equal to 1 and R t Indicates the distance from the transmitter to the center of the target, and D indicates the size of the target. will have a M×M k The output of the signal generating device of the road is connected to a M×M k The input terminal of the power amplifier of the road, the output terminal of the power amplifier is connected to the M×M k on a transmitting transducer array element. Inside the k-th transmitting sub-array, the distance d between adjacent transmitting transducer array elements k Less than or equal to the minimum value of the half-wavelength of the transmitted signal of the kth transmitting ...

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Abstract

The invention discloses an object detection method based on distribution type Phased-MIMO combined processing. Multiple sub-arrays are arranged on different positions in a distribution way, and emission coherent signals are formed in the internal parts of the sub-arrays via emission wave beams so that coherent gain is acquired. The signals between the sub-arrays radiate to different positions of objects in a mutually orthogonal way so that object diversity is acquired. A receiving array detects the objects through forming receiving wave beams and matching filtering waves. Coherent and non-coherent gain can be acquired by the method. Besides, the method has characteristics that interference is eliminated, reverberation is inhibited and scintillation of the objects is resisted. For the distribution type objects, when wave beam width of the sub-arrays is greater than an object size, detection performance is better than that of a conventional phased array.

Description

technical field [0001] The invention relates to an underwater target detection technology based on distributed Phased-MIMO joint processing, and belongs to the technical field of underwater acoustic target detection. Background technique [0002] When performing shallow sea target detection, the main interference affecting active detection is reverberation. Both reverberation and target echo are caused by the transmitted signal, and its spectral characteristics are highly correlated when the Doppler frequency shift is small. The characteristics of reverberation are also related to the propagation channel. Due to the influence of shallow sea acoustic channel, reverberation also has space-time variation characteristics and shows strong non-stationarity. Therefore, anti-reverberation is a research difficulty in detecting underwater targets. On the other hand, the spatial inhomogeneity of the target also leads to the flicker instability of active sonar detection performance, a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01S15/04
CPCG01S7/52003G01S7/52015G01S7/521G01S15/04
Inventor 丁振平潘翔
Owner ZHEJIANG UNIV
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