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High-resolution imaging method for short-range wide-field SAR based on 3D equidistant circle model

An imaging method and high-resolution technology, applied in the field of signal processing, can solve the problems of complex spatial variation characteristics of echoes, lack of analytical description of azimuthal spatial variation characteristics of echoes, difficulty in azimuth equalization processing, etc., and achieve a good focusing effect. Effect

Active Publication Date: 2021-07-02
HANGZHOU DIANZI UNIV
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Problems solved by technology

The difficulty is that the spatial oblique angle that varies with the ground distance leads to more complex space-varying characteristics of the echo’s range migration and Doppler parameters. At the same time, the azimuth and space-varying characteristics of the echo lack an accurate analytical description, resulting in azimuth balance. It is also difficult to process

Method used

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  • High-resolution imaging method for short-range wide-field SAR based on 3D equidistant circle model
  • High-resolution imaging method for short-range wide-field SAR based on 3D equidistant circle model
  • High-resolution imaging method for short-range wide-field SAR based on 3D equidistant circle model

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[0186] figure 2 is the three-dimensional geometric configuration diagram of SAR, the radar platform flies along a fixed route with a height of h at a constant speed v, and the center of the radar beam passes through the center point N of the scene successively 0 (x 0 ,y 0 ,0) and an arbitrary point target N(x,y,0), crossing the time t at the center of the beam c The corresponding beam center distances are r c0 and r c .

[0187] Table 2 System simulation parameters of the scene center

[0188]

[0189] Table 2 shows the system simulation parameters of the scene center used in this illustration example, and the range and azimuth widths of the imaging area are 2.0km and 1.3km respectively, and the theoretical resolution is 1.0m. The target N selected in this example 0 , N 1 , N 2 , N 3 and N 4 The positions on the ground two-dimensional coordinate system are (6856.5, 6856.5) m, (7149.8, 6549.8) m, (6549.8, 7149.8) m, (6149.4, 6149.4) m and (7563.6, 7563.6) m. Amo...

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Abstract

The invention discloses a short-range wide-area SAR high-resolution imaging method based on a three-dimensional equidistant circle model: firstly, the LRWC at a reference point is used to remove the main linear RCM, and the distance and azimuth coupling are alleviated. Then, the RCM linear term of all targets at zero time point in azimuth is removed by KT transformation, and part of the distance and azimuth coupling is relieved. Based on the processing results of Bulk RCMC, a new three-dimensional equidistant circle model is proposed, and an improved azimuth-space-variant residual high-order RCMC is proposed in the range-wise processing to deal with azimuth-space-variant residual high-order RCM, and in the follow-up Adding SRC to the processing completes the distance processing. Based on the three-dimensional equidistant circle model, the influence of the azimuth variation characteristics of the Doppler phase on imaging is analyzed by using the derived azimuth-space-variable slant distance analytic formula and the spatial oblique angle-of-view analytic formula that varies with the ground distance. Puller center frequency removal. The present invention has a better focusing effect when processing SAR echo data under short-distance wide-area and large squint imaging conditions.

Description

technical field [0001] The invention belongs to the field of signal processing, and relates to radar echo characteristics caused by spatial oblique angle of view varying with ground distance in short-distance, wide-ranging (short-distance wide-area) high-squint synthetic aperture radar (SAR) imaging High-quality SAR imaging processing work under changing and complex conditions. Background technique [0002] In recent years, synthetic aperture radar has been widely used in the field of military and civilian remote sensing, especially in airborne SAR imaging, highly squint SAR is an important imaging mode, because it provides more flexibility for SAR imaging and mobility. However, in applications such as cruise missiles, UAVs and other short-range wide-area squint imaging applications, the range-spatial variation of the oblique viewing angle is particularly significant, resulting in complex spatial-variation characteristics of range migration and Doppler parameters, making SA...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01S13/90
Inventor 钟华叶宗奇李世平王梦圆赵荣华刘静陈国瑾
Owner HANGZHOU DIANZI UNIV
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