Large-squint high-resolution SAR imaging method based on distance-azimuth circle model

A high-resolution, imaging method technology, applied in the field of signal processing, can solve the problems of inability to model Doppler phase, azimuth equalization misalignment azimuth compression results defocus, range migration correction results unable to meet the requirements of high resolution, etc.

Active Publication Date: 2018-08-28
浙江云杭光电科技有限公司
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Problems solved by technology

However, under the requirement of high-resolution imaging, the remaining high-order RCM will seriously deteriorate the final focusing result
Although many existing technical solutions have used the consistent RCMC (bulk RCMC) method to compensate the non-spatial-variant part of the remaining high-order RCM, the unprocessed azimuth-spatial-variant part still cannot meet the high-resolution requirements of the range migration correction result. Require
At t...

Method used

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  • Large-squint high-resolution SAR imaging method based on distance-azimuth circle model
  • Large-squint high-resolution SAR imaging method based on distance-azimuth circle model
  • Large-squint high-resolution SAR imaging method based on distance-azimuth circle model

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[0179] figure 2 is the geometric model of SAR, where A and B are the center point target and any point target of the imaging scene respectively. The plane carrying the SAR signal transceiver flies along the y-axis at a constant speed v, θ is the oblique angle, R(t; r c ,t c ) is the instantaneous slant distance from the point target B to the radar platform, r c for its at t c time slant distance.

[0180] Table 1 shows the system parameters used in this illustrative example, and the range and azimuth widths of the image area are 1.0m and 1.3m respectively, and the theoretical resolution is 1.0m. The target P selected in this example 0 , P 1 , P 4 , P 5 and P 6 The positions on the ground two-dimensional coordinate system are (0, 30000) m, (-650, 30194) m, (650, 29876) m, (0, 29002) m and (0, 30999) m. Among them, the azimuth edge point P 1 and P 4 Both have the same scene center point P 0 the same distance from the origin.

[0181] According to the parameters in...

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Abstract

The invention discloses a large-squint high-resolution SAR imaging method based on a distance-azimuth circle model. The method comprises the following steps: 1, constructing an SAR system geometric model to obtain an echo signal; 2, carrying out the range direction preprocessing of the signal in a frequency domain; 3, constructing the distance-azimuth circle model according to a range direction preprocessing result, and describing the azimuth space-variant characteristics of the SAR signal; 4, modeling an azimuth space-variant part in a remaining high-order RCM through a result given by the distance-azimuth circle model, and constructing a new variable-scale function to implement QRCMC, and then designing a distance compressing filter and completing all the processing in the distance direction; 5, modeling the azimuth space-variant characteristics of a Doppler phase according to the distance-azimuth circle model, achieving azimuth equalization through using an ENLCS algorithm, finallydesigning a filter for azimuth compression, and obtaining a final focused image. The method has a better focusing effect during the processing of large-squint and high-resolution echo data.

Description

technical field [0001] The invention belongs to the field of signal processing, and relates to a high-resolution imaging algorithm of high-squint synthetic aperture radar, specifically on the basis of constructing a new range-azimuth circle model, a new residual second-order range cell migration correction (QRCMC) is proposed , that is, the QRCMC processing method for the remaining distance migration of the azimuth space variation, and the improved azimuth ENLCS equalization process. Background technique [0002] The idea of ​​constructing an equivalently long antenna through signal analysis technology is called Synthetic Aperture Radar (SAR, Synthetic Aperture Radar). In remote sensing, SAR obtains surface images with the help of airborne or spaceborne platforms. This process uses the radar beam to transmit phase-modulated pulses in a direction that is nearly perpendicular to the movement of the sensor or has a large angle, and receives and records the reflections from the ...

Claims

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Application Information

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IPC IPC(8): G01S13/90
CPCG01S13/904G01S13/9041G01S13/9017
Inventor 钟华严爱博张艳军叶宗奇陈国瑾刘静
Owner 浙江云杭光电科技有限公司
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