Disc projection and splicing method for large view field space to ground observation images

A technology of earth observation and large field of view, applied in the field of space remote sensing detection, can solve problems such as no solution

Active Publication Date: 2017-06-27
CHANGCHUN INST OF OPTICS FINE MECHANICS & PHYSICS CHINESE ACAD OF SCI
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For large field of view, disk projection and stitching methods for i

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  • Disc projection and splicing method for large view field space to ground observation images
  • Disc projection and splicing method for large view field space to ground observation images
  • Disc projection and splicing method for large view field space to ground observation images

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Embodiment Construction

[0023] The embodiments of the present invention will be further described below in conjunction with the accompanying drawings, but the protection scope of the present invention should not be limited thereto.

[0024] Take the large-field-of-view far-ultraviolet imager on a polar sun-synchronous orbit as an example: the height of the sun-synchronous orbit is H=830km, and the projection reference spherical radius R r =6485.0km, the average radius of the earth R E =6375.0km, projected spherical spatial resolution Δ=10km, instrument cross-track field of view F 1 =130°, the field of view angle F of the instrument along the track 2 =10°, principal distance f=18.18mm, detector virtual pixel size Δ d = 0.035 mm. The working modes of the instrument include: the staring imaging mode between the magnetic latitude ±60°, the optical axis of the instrument points to the center of the earth; the area of ​​the magnetic latitude of the north and south poles is greater than 60° or less than ...

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Abstract

The invention relates to a disc projection and splicing method for large view field space to ground observation images and belongs to the space remote sensing detection technology field. The method mainly comprises steps that a conversion matrix between a geocentric coordinate system GEO and a projection disc coordinate system OPC is calculated; a disc projection grid is established on a reference spherical surface in the OPC coordinate system; latitudes and longitudes of grid points and a grid center point are calculated and are then further converted to the GEO coordinate system; the actual projected image point number of two-dimensional array Np storage grid points and a main intensity value of actual projected image points of the two-dimensional array Np storage grid points are calculated; a look vector under each image point satellite coordinate system is calculated and is gradually converted to the OPC coordinate system, and a projection image data matrix, a grid point geographical latitude and longitude data matrix and a grid point center geographical latitude and longitude data matrix are lastly acquired. The method is advantaged in that time sequence observation images are projected and spliced to one grid of the reference spherical surface, so spatial distribution of observation objects can be actually and accurately described through the projection images.

Description

technical field [0001] The invention belongs to the technical field of space remote sensing detection, and in particular relates to a disk projection and splicing method of large field of view space earth observation images. Background technique [0002] The ionosphere refers to the atmosphere 60km to 1000km above the earth's surface. Its main components include electrons, oxygen ions (accounting for more than 80%), hydrogen ions, helium ions and other trace heavy ions. The ion components are mainly composed of ultraviolet and X in the sun. Radiation-induced control of photochemical processes is generally electrically neutral. The main characteristics of the ionosphere are reflection, scattering, absorption and refraction of radio waves passing through the ionosphere. Changes in the ionosphere will affect radio waves propagating in the ionosphere, thereby affecting ground communications, satellite communications, and satellite navigation. Under the action of solar radiatio...

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Application Information

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IPC IPC(8): G06T3/00G06T3/40
CPCG06T3/005G06T3/4038
Inventor 何飞陈波
Owner CHANGCHUN INST OF OPTICS FINE MECHANICS & PHYSICS CHINESE ACAD OF SCI
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