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Imaging methods using emission grating lobes

An imaging method and emission grid technology, applied in the field of array imaging, can solve problems such as the limitation of azimuth resolution of the imaging system, and achieve the effect of suppressing echo interference

Inactive Publication Date: 2017-03-29
NORTHWESTERN POLYTECHNICAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the process of suppressing grating lobes, more constraints are imposed on the array design and the design of the transmitted signal, which leads to the limitation of the azimuth resolution of the imaging system

Method used

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  • Imaging methods using emission grating lobes
  • Imaging methods using emission grating lobes
  • Imaging methods using emission grating lobes

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Embodiment Construction

[0021] The present invention will be further described below in conjunction with the drawings and embodiments. The present invention includes but is not limited to the following embodiments.

[0022] The main contents of the present invention are:

[0023] Design a transmitting array with a large pitch and sparse arrangement and a receiving array with a small pitch densely arranged. The transmitting array needs to meet: the distance between the transmitting array elements is equal to the product of the receiving array element spacing and the number of receiving array elements, and a single transmitting main lobe and multiple transmitting grating lobes are generated simultaneously by using spatial under-sampling; the receiving array needs to meet: adopt a traditional dense array And when the main lobe of the receiving beam pattern points to a certain transmitting grating lobe (or main lobe), the zero point or low side lobe of the receiving beam pattern is aligned with other transmit...

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Abstract

The invention provides an imaging method through transmitting grating lobes. The method includes designing transmitting arrays, with large spacing, which are arranged in a sparse manner and receiving arrays, with small spacing, which are arranged in a sparse manner; when a receiving main lobe orientates to one transmitting grating lobe or main lobe, allowing the zero point of a receiving beam pattern or low side lobe to orientate to other transmitting grating lobes, performing signal emission, receiving beam forming and imaging according to designed arrays, and acquiring the imaging result of a target region. According to the method, more radiating angles can be acquired through the transmitting grating lobes, and higher angle solution can be acquired as compared with that of a traditional method.

Description

Technical field [0001] The invention relates to an array imaging method. Background technique [0002] In sonar, radar, and medical array imaging technologies, half-wavelength arrays are generally used (Sutton JL, Underwater acoustic imaging, Proceedings of the IEEE, 1979; 67(4):554-566. Bao Z, Xing MD and Wang T, Radar imaging technique, China: Publish House of Electronics Industry, 2005. Makovski A, Ultrasonic imaging using arrays, Proceedings of the IEEE, 1979; 67(4): 484-495.). In order to improve the azimuth resolution, the element spacing can be set slightly larger than half the wavelength. However, when the array element spacing is too large, the beam pattern will produce grating lobes (Van Trees HL. Optimum array processing: part 4 of detection, estimation, and modulation theory. Hoboken: John Wiley & Sons Inc., 2002.). The appearance of grating lobes causes ambiguity. Therefore, traditional imaging methods all avoid the appearance of grating lobes and treat the appear...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01S13/89G01S15/89
CPCG01S13/89G01S15/89
Inventor 刘雄厚孙超杨益新卓颉
Owner NORTHWESTERN POLYTECHNICAL UNIV