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Point Spread Function Extraction Method of Star Remote Sensing Image

A point spread function and extraction method technology, which is applied in the field of point spread function extraction of stellar remote sensing images, can solve problems such as inability to form, achieve the effects of improving extraction accuracy, avoiding integral operations, and reducing the amount of calculation

Active Publication Date: 2019-01-18
SHANGHAI SATELLITE ENG INST
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Problems solved by technology

For geostationary satellite imaging systems, direct imaging of stars cannot form feature images with knife-edge edges, so this method is also not suitable for satellite image navigation and the extraction of point spread functions of registered stars

Method used

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  • Point Spread Function Extraction Method of Star Remote Sensing Image
  • Point Spread Function Extraction Method of Star Remote Sensing Image
  • Point Spread Function Extraction Method of Star Remote Sensing Image

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Embodiment Construction

[0049] The present invention will be described in detail below in conjunction with specific embodiments. The following examples will help those skilled in the art to further understand the present invention, but do not limit the present invention in any form. It should be noted that those skilled in the art can make several changes and improvements without departing from the concept of the present invention. These all belong to the protection scope of the present invention.

[0050] The point spread function extraction method of star remote sensing image provided according to the present invention comprises the following steps:

[0051] Step S1: use a polynomial instead of a Bessel function to fit the point spread function of the star, and consider the calculation amount of the fitting accuracy, and select the order of the polynomial;

[0052] Step S2: According to the point spread function of the undetermined coefficient, combined with the relative position of the star imag...

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Abstract

The invention provides a point spread function extraction method for a fixed star remote sensing image. The method comprises the steps of 1: fitting a point spread function of a fixed star by using a polynomial; 2: deducing a calculation formula of a total gray value of column pixels in combination with relative positions of the fixed star image and the column pixels according to the point spread function of the fixed star; 3: extracting a relation of change of the total gray value of the column pixels along with a distance L by utilizing continuous exposure data of a column pixel, on a detector area array entering and exiting from a static remote sensing satellite instrument, of the fixed star image, wherein L represents the distance between the center of the fixed star image and the center of the column pixel; and 4: performing fitting calculation by utilizing a least square method in combination with the deduced calculation formula of the gray values of the column pixels in the step 2 and the relation of change of the total gray value of the column pixels along with the distance L in the step 3 to obtain an undetermined coefficient in the point spread function. According to the method, multiple packages of picture data when the fixed star goes across the sky are fully utilized; and multiple groups of data is fit, so that the calculation precision is greatly improved.

Description

technical field [0001] The invention relates to the technical field of satellite digital signal and image processing, in particular to a point spread function extraction method of star remote sensing images. Background technique [0002] With the improvement of the application technology of remote sensing satellites, it is usually required that the images of the ground imaged by high-precision geostationary satellites be precisely positioned and registered to the nominal grid of the earth. However, satellite platforms and remote sensing instruments are affected by factors such as space mechanical environment and thermal environment changes. Satellites will have orbital drift and attitude pointing deviations, and instruments will produce geometric deformation, which will affect the positioning and registration accuracy of remote sensing images. "Satellite image navigation and registration" technology can solve such problems: the satellite performs real-time angle incremental ...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F17/15
CPCG06F17/15
Inventor 王田野吕旺王皓信思博沈毅力董瑶海
Owner SHANGHAI SATELLITE ENG INST
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