Quick beamforming method capable of improving array resolution and gain

A resolution and beam technology, applied in the field of array signal processing, can solve problems such as high requirement of primitive consistency, poor stability, limited performance, etc., and achieve simple and easy calculation process, reduce the number of arrays, and improve spatial resolution. force effect

Inactive Publication Date: 2011-09-14
HARBIN ENG UNIV
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Problems solved by technology

The conventional fourth-order cumulant method requires more snapshots than the second-order statistical method, and the high-resolution algorithm based on the fourth-order cumulant has high requirements for signal-to-noise ratio, independence between sources, and consistency of primitives , poor stability and other characteristics, these characteristics make the performance of this signal processing method limited in practical engineering applications

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  • Quick beamforming method capable of improving array resolution and gain
  • Quick beamforming method capable of improving array resolution and gain
  • Quick beamforming method capable of improving array resolution and gain

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Embodiment Construction

[0020] The present invention is described in more detail below in conjunction with accompanying drawing example:

[0021] The transmitting part of the active sonar system (as shown in FIG. 1 ) emits sound waves from the waveform generator 1 through the multi-beam former 2 and the power amplifier 3 . Transceiver switch 4 switches the state of transmission and reception. When the active sonar works in the receiving state, the signal received by the transducer matrix 5 enters the receiver 6 . The present invention utilizes the optimized array 7 as the receiving matrix to effectively reduce the complexity of the receiving system. The signal received by the matrix enters the signal processor 11 through the preamplifier 8 , A / D sampling 9 , filter 10 , and finally enters the terminal for display 12 .

[0022] The present invention proposes a beamforming method for improving beam performance (such as figure 2 ), including performing FFT processing 14 on the received data 13 of th...

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Abstract

The invention provides a quick beamforming method capable of improving array resolution and gain, comprising the following steps: adopting the construction of a minimum redundant array to optimize an M-element uniform linear array into a P-element non-uniform linear array; carrying out FFT processing on primitive data of a P-element array; in a frequency domain, constructing a covariance matrix of data based on the uniform linear array in accordance with the array aperture extension characteristics of fourth-order cumulants; carrying out normalization processing on the beam space and carryingout estimation on a Bartlett spatial spectrum. By adopting the array aperture extension characteristics of the fourth-order cumulants, the invention realizes that the optimized element layout form isemployed to obtain high resolution and overcomes the defects of high requirements of the original fourth-order cumulant-based methods on snapshots and great computational complexity to enable the computation process to be simple and easy to operate. When the signal to noise ratio is higher than the supercritical signal to noise ratio, the method of the invention has higher array gain than that ofconventional beamforming. The normalization processing of the beam space realizes effective inhibition to background interference. The beamforming method of the invention is simple and easy to operate and is especially suitable for project application.

Description

(1) Technical field [0001] The invention relates to a matrix signal processing method. Specifically, it is a signal processing method that can improve the spatial resolution and array gain of the receiving array. (2) Background technology [0002] For existing active sonars, such as forward-looking sonar, side-scan sonar, shallow profile sonar, minehunting sonar, etc., reverberation and environmental noise are the main sources of interference. In order to make the echo data have a higher signal-to-mix ratio, the method of short pulse transmission and narrow beam reception is usually adopted. The design of the array mostly adopts the beamforming method based on FFT (Fast Fourier Transform) to estimate the azimuth of the target echo. The calculation amount of the FFT-based multi-beamforming method is small, but its spatial resolution is limited by the physical aperture of the array, and it cannot distinguish the target within a beam width. To improve the resolution, it is n...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01S7/52G01S15/00
Inventor 李秀坤李婷婷杨士莪朴胜春黄金城
Owner HARBIN ENG UNIV
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