Optical push-broom satellite in-orbit stepwise geometric calibration method based on probe element direction angle

A geometric calibration and pointing angle technology, applied in the field of geometric processing of remote sensing images, can solve problems such as difficult to obtain stable, reliable, high-precision calibration results

Active Publication Date: 2013-01-30
WUHAN UNIV
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Problems solved by technology

Due to the special imaging characteristics of spaceborne line array cameras such as high orbit, narrow field of view, and linear array pushbroom, there is a strong correlation between geometric imaging parameters. If the calibration model and method of close-range cam...

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  • Optical push-broom satellite in-orbit stepwise geometric calibration method based on probe element direction angle
  • Optical push-broom satellite in-orbit stepwise geometric calibration method based on probe element direction angle
  • Optical push-broom satellite in-orbit stepwise geometric calibration method based on probe element direction angle

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Embodiment Construction

[0052] The specific implementation of the present invention will be described in detail below in conjunction with the accompanying drawings and examples. see figure 1 , the process of the embodiment can be divided into three steps, and the specific method, formula and process implemented in each step are as follows:

[0053] 1. Use the control point data to measure the control point information on the image to be calibrated. In order to ensure the calculation accuracy of the calibration results, suggestions are provided for the number and distribution of the measured control points: in the image to be calibrated, the measured control points should be distributed in a shorter area along the track as much as possible Inside, the direction of the vertical rail should evenly cover the entire CCD range. In terms of the number of control points, as many as possible under the premise of reasonable cost.

[0054] 2. Using auxiliary data such as attitude, orbit, and imaging time, as...

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Abstract

The invention discloses an optical push-broom satellite in-orbit stepwise geometric calibration method based on a probe element direction angle. A probe element direction angle-based in-orbit geometric calibration model and a stepwise calibration resolving method are included. According to the method, a probe element direction angle model is used as a camera calibration model; calibration parameters comprise internal calibration parameters and external calibration parameters; and the external calibration parameters are resolved first and then the internal calibration parameters are resolved by using a stepwise calibration method, so that the condition that a reliable calibration result cannot be obtained due to strong correlation existing between the calibration parameters is avoided. By the effective optical push-broom satellite in-orbit geometric calibration method, in-orbit geometric calibration can be effectively performed on an optical push-broom satellite, and the geometric quality of image products is improved. Practice proves that the calibration method is feasible and effective, and the calibration result is stable, reliable and high in precision.

Description

technical field [0001] The invention belongs to the field of geometric processing of remote sensing images, and relates to a step-by-step geometric calibration method for on-orbit optical push-broom satellites based on probe pointing angles. Background technique [0002] On-orbit geometric calibration is the key link to give full play to the geometric performance of high-resolution optical remote sensing satellites, and it is of great significance to improve the geometric quality of satellite image products. Due to the release of stress during the satellite launch process, changes in the imaging environment, and device aging, the geometric imaging parameters of satellite images have changed, and the laboratory calibration results are no longer applicable, and must be reacquired through on-orbit geometric calibration. The precise value of these parameters, otherwise, the geometric quality of satellite imagery products is difficult to guarantee, and cannot meet the requirement...

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Application Information

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IPC IPC(8): G01C25/00
Inventor 王密杨博李德仁龚健雅
Owner WUHAN UNIV
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