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Fast wide satellite SAR geocoding method

A geocoding and spaceborne technology, which is applied in the field of remote sensing image processing, can solve problems such as the failure of the automatic process of spaceborne SAR geocoding, affecting the efficiency of SAR geocoding, and non-convergence of results, so as to improve geocoding efficiency, reduce input interfaces, Avoid the effect of six-coordinate transformation

Active Publication Date: 2011-07-20
INST OF ELECTRONICS CHINESE ACAD OF SCI
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Problems solved by technology

Traditional methods all use numerical iteration, and when the initial value is not selected properly, the result may not converge, and iterative processing takes too much time, which seriously affects the efficiency of SAR geocoding
Moreover, ill-conditioned equations will appear in the process of establishing the image mapping relationship based on the slant range Doppler model, resulting in the failure of the automatic process of spaceborne SAR geocoding

Method used

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  • Fast wide satellite SAR geocoding method

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Embodiment

[0098] The present invention takes the 1.1-level product of ALOS in Shandong area on October 12, 2006 as an example, and further explains it in conjunction with the accompanying drawings. Concrete implementation steps of the present invention are as Image 6 Shown:

[0099] Step S21: extract the relevant parameters of the auxiliary file in the spaceborne SAR real image product, including the following parameters and several sets of satellite position and velocity vectors.

[0100]

[0101] The implementation conditions of this step need to extract relevant satellite parameters according to the product format description of ALOS.

[0102] Step S22: Fitting the satellite orbit curve to obtain the relationship between the satellite position velocity and the image azimuth time.

[0103] Step S23: Select the parameters of the map projection model according to the purpose of the map image product, including: the longitude of the projection center point, the latitude of the proj...

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Abstract

The invention discloses a fast wide satellite synthetic aperture radar (SAR) geocoding method. In the method, a fast satellite SAR image geocoding method frame is obtained by integrating a slope-distance Doppler positioning model strictly meeting a star-to-space geometric relationship and a ground control point (GCP) development-based remote sensing image polynomial calibration model, so that the process of conventional satellite SAR geocoding is simplified, the efficiency of wide satellite SAR geocoding is improved, and geometric deformation caused by inaccurate Doppler central frequency in an SAR imaging algorithm is eliminated. In single-pixel geocoding, the algebra analytical solution of slope-distance Doppler nonlinear equations is given and the problem of initial value selection facing a numerical iterative method used by the conventional slop distance-Dropper positioning model is solved by the method. The invention discloses a new fast satellite SAR geocoding method, which can be widely used for satellite SAR image geocoding.

Description

technical field [0001] The invention belongs to the technical field of remote sensing image processing, and relates to a geocoding method for remote sensing images, in particular to a fast geocoding method for wide-width spaceborne SAR. Background technique [0002] With the development of my country's comprehensive national strength and space technology, spaceborne synthetic aperture radar, as an active remote sensor working in the microwave band, can complete earth observation without being limited by sunshine and weather conditions. , environment, hydrology, marine, disaster, surveying and mapping and military applications are receiving more and more attention. [0003] As one of the important pillars of remote sensing applications, the high-precision spaceborne SAR image geocoding product is the most important product of the ground processing system and is directly oriented to users. Facing the needs of wider spaceborne SAR observation band, huge observation data and wid...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S7/295G01S13/90
Inventor 刘佳音洪文
Owner INST OF ELECTRONICS CHINESE ACAD OF SCI