Method for calibrating in-orbit exterior orientation parameters of push-broom optical cameras of remote sensing satellite linear arrays

An optical camera and remote sensing satellite technology, applied in the field of remote sensing satellite image processing, can solve problems such as the decrease of uncontrolled geometric positioning accuracy and the lack of direct calibration methods for azimuth elements outside the orbiting satellite.

Active Publication Date: 2014-03-26
SPACE STAR TECH CO LTD
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Problems solved by technology

Affected by factors such as ground measurement errors and post-launch environmental momentum, the outer azimuth parameters of remote sensing satellites have changed after launch, causing a se

Method used

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  • Method for calibrating in-orbit exterior orientation parameters of push-broom optical cameras of remote sensing satellite linear arrays
  • Method for calibrating in-orbit exterior orientation parameters of push-broom optical cameras of remote sensing satellite linear arrays
  • Method for calibrating in-orbit exterior orientation parameters of push-broom optical cameras of remote sensing satellite linear arrays

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Embodiment Construction

[0047] Attached below figure 1 Specific embodiments of the present invention are further described in detail:

[0048] 1. In the image to be checked I 1 , high-precision control image I 2 Using the control point automatic matching algorithm to collect high-precision control point pair information,

[0049] (1) Based on the SIFT algorithm, the original image to be corrected I 1 Perform feature point extraction to obtain m feature points PixI 1i (i=1,2...,m), record the SIFT feature vector of each feature point;

[0050] The SIFT feature matching algorithm is characterized as follows:

[0051] (1.1) Determine the position coordinates and scale of the feature points. Build an image Gaussian pyramid, and detect extreme values ​​in the 26 neighborhoods in the pyramid scale space. If a point (x, y) is the maximum or minimum value in the pyramid scale space and the 26 neighborhoods in the upper and lower layers , defining this point as a feature point of the image at this scal...

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Abstract

The invention discloses a method for calibrating in-orbit exterior orientation parameters of push-broom optical cameras of remote sensing satellite linear arrays. The method includes steps of (1), acquiring information of high-precision control points; (2), acquiring interior orientation elements of the cameras at the control points, acquiring auxiliary data of orbits and the like and building rigorous imaging geometric models of various control points; (3), computing positioning errors of the various control points, eliminating coarse and poor control points and acquiring information of preliminarily calibrated control points; (4), building geometric calibration mathematical models of exterior orientation elements of the cameras, and computing theoretical pointing vectors and actual pointing vectors of the various control points; (5), creating three-axis rotation error equations among the theoretical pointing vectors and the actual pointing vectors and linearly processing the equations; (6), solving parameters of the error equations by a least square process to acquire calibration exterior parameters. The method has the advantage that after errors of a system are compensated by the aid of the calibration exterior parameters, the cameras are stable in non-control positioning precision.

Description

technical field [0001] The invention relates to an off-orbit azimuth parameter calibration method of a linear array push-broom optical camera of a remote sensing satellite, belongs to the technical field of remote sensing satellite image processing, and is used for optimizing and improving the on-orbit positioning accuracy of a linear push-broom camera mounted on a remote sensing satellite. Background technique [0002] With the continuous launch of remote sensing satellites at home and abroad, the resolution of remote sensing satellites has been continuously improved. The characteristics of large area, short period, and low cost of satellite remote sensing make it the dominant direction of remote sensing development. As of the end of 2012, my country has launched multiple series of optical remote sensing satellites for environment, resources, remote sensing, etc., but a large amount of domestic remote sensing data has not been fully utilized. The reason is that the low accur...

Claims

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Application Information

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IPC IPC(8): G06T7/00
Inventor 马灵霞郝胜勇王剑邹同元郭翠翠马狄张荞丁火平纪强李宝明
Owner SPACE STAR TECH CO LTD
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