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SAR (synthetic aperture radar) image polynomial orthorectification method

An ortho-correction, polynomial technology, applied in the direction of using re-radiation, reflection/re-radiation of radio waves, measurement devices, etc., can solve problems such as difficult to apply SAR image correction, large image deformation, etc. Effect

Inactive Publication Date: 2010-06-16
CHINESE ACAD OF SURVEYING & MAPPING
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Problems solved by technology

[0009] There are many factors that cause SAR image distortion, most of which can be corrected by polynomial correction methods; however, image distortion caused by projection difference is difficult to correct by general polynomial correction methods
Especially when the tilt angle is large, the image distortion caused by the projection difference is greater, so the general polynomial correction method is difficult to apply to SAR image correction in areas with large terrain fluctuations.

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Embodiment Construction

[0019] In order to make the object, technical solution and advantages of the present invention clearer, specific embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings.

[0020] figure 1 It is a schematic diagram of the influence of terrain fluctuations on radar images according to the present invention; figure 2 It is a schematic diagram of SAR image tilt correction according to the present invention.

[0021] The image point displacement caused by terrain fluctuations in the radar image is as follows: figure 1 shown. Let the elevation on the ground point P be h, and its image coordinate be X p =λR, where λ is the imaging scale, P′ is the projection point of point P on the ground datum plane, and its slant distance can be approximately expressed as:

[0022] R′≈R+hcosθ

[0023] Here θ is the imaging angle of point P'. Then the corresponding displacement due to terrain undulation is:

[0024] ΔX=X p -X p′ ...

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Abstract

The invention relates to an SAR (synthetic aperture radar) image orthorectification method based on a polynomial, which comprises the following steps of: calculating a relied displacement formed by topographic relief according to a geometrical relationship of slope distance imaging; correcting the relied displacement obtained by calculation; and correcting other factors influencing SAR imaging by utilizing a traditional SAR image polynomial correcting method. Through the SAR image orthorectification method based on the polynomial, the invention can carry out accurate geometry correction on areas with larger topographic relief; and moreover, the SAR image orthorectification method based on the polynomial is quite easy to implement and can achieve quite high precision. In addition, the method is not only suitable for satellite-borne SAR image orthorectification, but also suitable for airborne SAE image orthorectification.

Description

technical field [0001] The present invention relates to the field of image processing, more precisely, relates to a polynomial-based SAR image orthorectification method, the polynomial-based SAR image orthorectification method draws projection difference on the basis of the traditional polynomial correction method, and completes Orthorectification of SAR images. Background technique [0002] Synthetic Aperture Radar (SAR) is side-looking imaging, and its side viewing angle is usually much larger than that of optical images, which makes the influence of terrain fluctuations on the geometric distortion of SAR images much greater. Therefore, it is necessary to perform geometric correction on SAR images to form an orthophoto map, and the difficulty of SAR image correction is more difficult than that of optical images. [0003] At present, the commonly used SAR image correction methods mainly include polynomial method, collinear equation method and range-Doppler method. [0004...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S7/40G01S13/90
Inventor 张继贤黄国满赵争段连飞杨书成
Owner CHINESE ACAD OF SURVEYING & MAPPING
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