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Oblique airborne synthetic aperture radar two-dimensional space-variant range migration correction method and device

A range migration correction and synthetic aperture radar technology, which is applied in measuring devices, radio wave reflection/re-radiation, and re-radiation, can solve the problem of image focus quality degradation, affecting SAR image interpretation, and inability to compensate for two-dimensional space variation Problems such as distance migration components, etc., to achieve the effect of strong practicability and high correction accuracy

Active Publication Date: 2020-09-18
BEIJING INST OF RADIO MEASUREMENT
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Problems solved by technology

The coupling of range and azimuth signals will result in a decrease in the quality of imaging focus and affect the interpretation of SAR images. At present, the method of range walking correction combined with range migration correction is usually used for decoupling processing
[0003]However, the current range migration correction method can compensate non-space-variant and partial range-space-variant range migration, but cannot compensate for the two-dimensional The space-varying distance migration component, currently lacks an accurate two-dimensional space-varying distance migration correction method designed for the squint working mode

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  • Oblique airborne synthetic aperture radar two-dimensional space-variant range migration correction method and device
  • Oblique airborne synthetic aperture radar two-dimensional space-variant range migration correction method and device
  • Oblique airborne synthetic aperture radar two-dimensional space-variant range migration correction method and device

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[0029] The principles and features of the present invention will be described below in conjunction with the accompanying drawings, and the examples given are only used to explain the present invention, and are not intended to limit the scope of the present invention.

[0030] Such as figure 1 As shown, the flow diagram provided for the embodiment of the two-dimensional space-variable distance migration correction method of the present invention, the two-dimensional space-variable distance migration correction method is applicable to airborne synthetic aperture radar, including:

[0031] S1. Acquire echo signals, and perform walking correction and motion compensation on the echo signals.

[0032] It should be noted that after the airborne synthetic aperture radar receives the echo signal, it can first transform the echo signal into the range wavenumber domain, and at the same time perform walking correction and motion compensation according to the center point of the scene, inc...

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Abstract

The invention discloses an oblique airborne synthetic aperture radar two-dimensional space-variant range migration correction method and device, and relates to the field of airborne synthetic apertureradars. The method comprises the following steps: performing walking correction and motion compensation on an echo signal; partitioning the echo signal after walking correction and motion compensation according to a preset partitioning mode to obtain at least one sub-block signal; carrying out SPECAN processing, range migration correction and inverse SPECAN processing on each sub-block signal respectively; and splicing the sub-block signals after the inverse SPECAN processing. The method can achieve precise correction of two-dimensional space-variant range migration, is high in practicality,is high in correction precision, and is suitable for real-time processing of a board card.

Description

technical field [0001] The invention relates to the field of airborne synthetic aperture radar, in particular to a two-dimensional space-variable distance migration correction method and device for squint airborne synthetic aperture radar. Background technique [0002] The squint working mode is widely used in airborne Synthetic Aperture Radar (SAR). In the squint mode, the coupling of range and azimuth signals caused by the squint geometric model of the echo is a problem that needs to be solved. The coupling of range and azimuth signals will cause the quality of imaging focus to degrade and affect the interpretation of SAR images. At present, the method of range walking correction combined with range migration correction is usually used for decoupling processing. [0003] However, the current distance migration correction method can compensate for non-space-variant and part-range-space-variant distance migration, but cannot compensate for the two-dimensional space-variant d...

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Application Information

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IPC IPC(8): G01S7/40G01S13/90
CPCG01S7/40G01S13/9041
Inventor 王冠勇汪伟冯亮李军张磊
Owner BEIJING INST OF RADIO MEASUREMENT
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