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Array factor molding method of synthesis aperture microwave radiometer

A technology of microwave radiometer and array factor, which is applied in calculation, instrumentation, electrical digital data processing, etc., can solve the problems of poor accuracy and difficulty in meeting the accuracy requirements of remote sensing of the earth, and achieve the purpose of improving inversion accuracy, improving inversion accuracy and The effect of spatial resolution

Inactive Publication Date: 2014-07-30
HUAZHONG UNIV OF SCI & TECH
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Problems solved by technology

However, the biggest problem of the non-uniform sampling synthetic aperture radiometer in the application of earth remote sensing is the poor accuracy
Due to the poor accuracy of non-uniform sampling synthetic aperture radiometers, it is difficult to meet the accuracy requirements required for remote sensing of the earth

Method used

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  • Array factor molding method of synthesis aperture microwave radiometer
  • Array factor molding method of synthesis aperture microwave radiometer
  • Array factor molding method of synthesis aperture microwave radiometer

Examples

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Embodiment

[0065] Embodiment: One-dimensional random sampling synthetic aperture radiometer system; in this embodiment, the antenna array is a one-dimensional random array of linear arrays. All its antenna elements are on the same line, refer to figure 1 .

[0066] The specific steps of the array factor shaping method are as follows:

[0067] (1) Calculate the corresponding sampling point position u in the spatial frequency domain according to the position coordinate x of the antenna unit on the space plane, where u=(x i -x j ) / λ, where λ is the signal wavelength. It corresponds to the density distribution reference of sampling points in the spatial frequency domain figure 2 .

[0068] (2) Multiply by the coefficient c at each sampling point i , to get the corrected array factor AF m (ξ). In this embodiment, it is assumed that it is applied to the field of remote sensing of the ground, so the desired array factor is selected as the unit impulse function δ(ξ). In addition to the...

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Abstract

The invention discloses an array factor molding method of a synthesis aperture microwave radiometer. The array factor molding method comprises the steps of calculating the positions of sampling points in a space frequency domain corresponding to an antenna unit according to the position coordinates of the antenna unit; multiplying each sampling point by a coefficient corresponding to the sampling point to obtain amended array factors, selecting a desired array factor, and calculating the error function of the amended array factors and the desired array factor; calculating a coefficient under the condition of enabling the norm or mean square error of the error function to be minimal; multiplying the calculated coefficient by the corresponding sampling points to obtain amended array factors. Each amended array factor has a smaller sidelobe or narrower main wave beam, and the inversion precision of a non-uniform sampling synthesis aperture radiometer is improved; the array factor molding method is suitable for both the non-uniformity sampling synthesis aperture radiometer and a uniform sampling synthesis aperture radiometer, and has a better effect for improving the inversion precision and the space resolution of the synthesis aperture radiometers.

Description

technical field [0001] The invention belongs to the technical field of microwave remote sensing and detection, and more particularly relates to a method for forming a synthetic aperture microwave radiometer array factor, which is not only used for earth remote sensing, but also can be used in the fields of lunar remote sensing and deep space exploration. Background technique [0002] The synthetic aperture radiometer utilizes multiple discrete small antennas to synthesize an equivalent large antenna aperture, and adopts a sparse array arrangement to reduce the mass and volume of the antenna and improve the spatial resolution of passive microwave remote sensing. However, this advantage comes at the cost of system structure and signal processing complexity, especially for large-scale synthetic aperture systems such as spaceborne synthetic aperture radiometers. Due to the large number of antennas, the system structure and signal processing will be very complicated. The amount o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F19/00
Inventor 李青侠丰励陈柯李育芳
Owner HUAZHONG UNIV OF SCI & TECH
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