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A Large Forward Squint Synthetic Aperture Radar Imaging Method

A technology of synthetic aperture radar and imaging method, which is applied in the field of signal processing, can solve problems such as inability to image, affect guidance accuracy, and difficulty in application, and achieve the effect of increasing the depth of focus

Active Publication Date: 2019-02-19
BEIJING INSTITUTE OF TECHNOLOGYGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, since the seeker usually works under the condition of large forward oblique angle of view in the final guidance stage, the conventional SAR imaging method is difficult to apply, or even impossible to image, which seriously affects the guidance accuracy, thus limiting the application range of this technology

Method used

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  • A Large Forward Squint Synthetic Aperture Radar Imaging Method
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  • A Large Forward Squint Synthetic Aperture Radar Imaging Method

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Embodiment Construction

[0017] Below in conjunction with accompanying drawing and specific embodiment the present invention is described in further detail:

[0018] The invention relates to a large front squint synthetic aperture radar imaging method, the processing object is the full aperture echo data of the radar, and the obtained result is a high-resolution SAR image. The spatial geometric relation figure that adopts in the inventive method is as figure 1 As shown, the radar flies along the straight line AB of the YOZ plane at speed v, the center of the radar beam illuminates the ground point target T, point A is located on the Z axis, and the radar is located at point B after time t, θ 0 is the oblique angle illuminated by the center of the radar beam; the height between the radar and the ground is H 0 , when the marked radar is at point A, the distance between the radar and the point target T is R 0 ; When the marked radar is located at point B, the distance between the radar and the point ta...

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Abstract

The invention relates to a high forward-squint synthetic aperture radar (SAR) imaging method. The method comprises: firstly performing distance direction fast Fourier transform (FFT) on SAR original echo data, and then performing range compression; secondly, performing walking correction; performing azimuth direction FFT, and then performing bending correction; performing distance direction fast Fourier inverse transform (IFFT), and then performing high-order phase compensation; finally performing azimuth direction IFFT, and then performing high-order item compensation on a fifth-order taylor expansion of an azimuth phase, performing azimuth direction FFT on the data which is performed by azimuth compensation, to obtain a final SAR image. Compared with a conventional squint SAR imaging method, the method can realize relatively large squint angle SAR imaging, and can realize high-precision SAR imaging under relatively large azimuth focus depth.

Description

technical field [0001] The invention relates to a large front squint synthetic aperture radar (SAR) imaging method, which belongs to the technical field of signal processing. Background technique [0002] Synthetic Aperture Radar (SAR) is a microwave imaging radar with high resolution capability. SAR has the unique advantages of all-day, all-weather work and long range. Under the high-speed and high-mobility carrier platform, SAR is applied in carrier terminal guidance, because it can find targets in harsh environments such as night, smoke, strong light interference, etc., so SAR is more suitable for terminal guidance and complex flight conditions in complex flight environments. Landing requirements. However, since the seeker usually works under the condition of large forward oblique angle of view in the final guidance stage, the conventional SAR imaging method is difficult to apply, or even impossible to image, which seriously affects the guidance accuracy, thus limiting t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01S13/90
CPCG01S13/9017G01S13/9041
Inventor 傅雄军袁大森谢民李德胜
Owner BEIJING INSTITUTE OF TECHNOLOGYGY
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