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Short-range wide-area SAR high-resolution imaging method based on three-dimensional isometric circle model

An imaging method and high-resolution technology, applied in the field of signal processing, can solve problems such as the lack of analytical description of the azimuth space-variation characteristics of the echo, the difficulty of azimuth equalization processing, and the complex space-variation characteristics of the echo.

Active Publication Date: 2019-08-23
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

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  • Short-range wide-area SAR high-resolution imaging method based on three-dimensional isometric circle model
  • Short-range wide-area SAR high-resolution imaging method based on three-dimensional isometric circle model
  • Short-range wide-area SAR high-resolution imaging method based on three-dimensional isometric 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 isometric circle model. Firstly, main linear RCM is removed by using LRWC at a referencepoint, thereby relieving range-azimuth coupling. Secondly, RCM linear terms of all azimuth zero point targets are removed through KT, and part of the range-azimuth coupling is relieved. Based on a processing result of Bulk RCMC, the new three-dimensional isometric circle model is provided; improved residual high-order RCMC of azimuth space variation is provided in range direction processing for processing residual high-order RCM of the azimuth space variation; and SRC is added in subsequent processing to complete the range direction processing. On the basis of the three-dimensional isometriccircle model, derived azimuth space variation slant range analysis formula and analysis formula for space variation of a spatial squint angle along with a ground distance are used for analyzing the influence of azimuth change characteristics of a Doppler phase on imaging, and removing a Doppler center frequency. The method has a better focusing effect in processing SAR echo data under a short-range wide-area and large-squint imaging condition.

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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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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