8-millimeter waveband synthetic aperture radiometer antenna array layout method capable of relieving aliasing

A technology that integrates aperture and layout methods, applied in antenna arrays, antennas, electrical components and other directions, can solve problems such as excessive size, inversion image aliasing, etc., to reduce aliasing effects, high sampling efficiency, and fast inversion imaging algorithms Effect

Inactive Publication Date: 2010-09-22
BEIHANG UNIV
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Problems solved by technology

[0004] The technical solution problem of the present invention: for the antenna unit electrical dimension of 8mm band synthetic aperture radiometer (electrical dimension is the ratio of antenna dimension relative to operating wavelength, the minimum electrical dimension is about 3) in 8mm band is too large, adopting conventional array layout will make The problem of serious aliasing in the inversion image provides a layout method for the antenna array of the 8mm band synthetic aperture radiometer to alleviate the aliasing effect of imaging when the conventional array layout is used

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  • 8-millimeter waveband synthetic aperture radiometer antenna array layout method capable of relieving aliasing
  • 8-millimeter waveband synthetic aperture radiometer antenna array layout method capable of relieving aliasing
  • 8-millimeter waveband synthetic aperture radiometer antenna array layout method capable of relieving aliasing

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Embodiment Construction

[0019] The layout method of the aliasing-mitigating synthetic aperture radiometer antenna array of the present invention is specifically implemented as follows:

[0020] First, construct a regular Y-shaped array. The regular Y-shaped array is composed of three uniform linear arrays with a difference of 120°. Figure 9 The three uniform linear arrays are represented by blue solid lines and marked as ①, ②, and ③ respectively, and the antenna element interval of each uniform linear array is d.

[0021] Secondly, on the reverse extension line of ①, ②, ③ uniform linear array (in Figure 9 Indicated by the black dotted line in ), at a distance of 1.5d from the center of the Y-shaped array, a one-dimensional uniform linear array with the same size as each arm of the Y-shaped array is placed. Figure 9 ④, ⑤, and ⑥ respectively.

[0022] The simulation results show that: the present invention considers the advantages of high directivity and low mutual coupling of the potter horn ant...

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Abstract

The invention discloses an 8-millimeter waveband synthetic aperture radiometer antenna array layout method capable of relieving aliasing, which is used in the layout of the antenna arrays of an 8-millimeter waveband synthetic aperture radiometer to relieve the aliasing effect in imaging when the conventional array layout is used. The array layout of the method is mainly characterized in that: the array layout is based on the conventional Y-type array layout; and a uniform linear array having the same size as the conventional Y-type array is arranged on the reversely extended line of each arm of the conventional Y-type array at a distance that is 1.5 times antenna unit spacing from a central antenna unit. Compared with the conventional Y-type array layout, the array layout greatly relieves the aliasing degree of inversion imaging as the sampling interval of a signal in spatial frequency reduces by half.

Description

technical field [0001] The invention relates to an antenna array layout method of an 8mm band synthetic aperture radiometer for slowing aliasing, which belongs to the microwave radiometer technology. Background technique [0002] In the system design of the synthetic aperture microwave radiometer, the layout of the antenna array is one of the key technologies, because it directly determines the sampling position of the radiometer system in the signal space frequency domain, and thus determines the radiometer system to a large extent. Properties of the point spread function. [0003] The imaging principle of the synthetic aperture radiometer is based on the Fourier transform relationship between the spatial frequency domain sampling signal and the scene brightness temperature image. According to the Nyquist sampling law, only when the sampling signal interval is not greater than the half-wavelength of the operating frequency, the inverted image will not appear aliasing. Whe...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01Q21/00
Inventor 胡岸勇赵锋苗俊刚
Owner BEIHANG UNIV
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