Method of correcting thermal deformation errors of geostationary orbit optical camera

A technology of geostationary orbit and deformation error, which is applied in the field of space satellite positioning to achieve the effect of improving on-orbit positioning accuracy, correcting positioning error, and shortening avoidance time

Active Publication Date: 2019-03-08
SHANGHAI INST OF TECHNICAL PHYSICS - CHINESE ACAD OF SCI
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Problems solved by technology

[0009] The purpose of the present invention is to overcome the deficiencies of the prior art, to provide a thermal deformation error correction method for optical cameras in geostationary orbit, and to solve the problem of geometric positioning accuracy of high-orbit satellites

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  • Method of correcting thermal deformation errors of geostationary orbit optical camera
  • Method of correcting thermal deformation errors of geostationary orbit optical camera
  • Method of correcting thermal deformation errors of geostationary orbit optical camera

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Embodiment Construction

[0029] Taking the short-wave infrared data of a certain type of stationary orbit staring camera as an example below, select the thermal deformation positioning error data for 7 consecutive days, and further describe the specific embodiment of the present invention in conjunction with the accompanying drawings:

[0030] The present invention uses high-precision fitting of thermal deformation positioning error change law, and corrects the subsequent day's positioning error with a correction model formed by fitting models for n consecutive days. Here, n=3 is selected, and the Fourier series model is taken as the third order, and the method is described. It mainly includes the following steps:

[0031] (1) Through the geometric positioning model, the observation value of the thermal deformation positioning error of a certain type of geostationary optical camera in continuous periods is obtained; figure 2 Shown is the thermal deformation positioning error of this model of geostat...

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Abstract

The invention discloses a method of correcting thermal deformation errors of a geostationary orbit optical camera. The method includes the steps of (1) acquiring an observation value of a thermal deformation positioning error of the geostationary orbit optical camera; (2) using a mathematical model to fit over-time change law of the observation value of the error; (3) using error data of day n+1 to resolve weight coefficient of a correction model composed of error fitting models of days 1, 2 to n; (4) applying the weight coefficient of step (3) to the error fitting models of days 2, 3 to n+1 so as to obtain an error correction model of day n+2; (5) subtracting a prediction value of the error correction model by the observed value of the error of day n+2 so as to obtain the corrected positioning error value. The method herein is suitable for effectively correcting geostationary orbit optical camera positioning errors due to thermal deformation, has the advantages of reasonable design, high precision, low cost, good convenience of use and the like, and is applicable and popularizable in the field of high-precision remote sensing satellite geometric locating.

Description

technical field [0001] The invention belongs to the technical field of space satellite positioning, and in particular relates to a positioning error correction method for space thermal deformation of an optical camera in geostationary orbit. Background technique [0002] Due to the characteristics of high time resolution, wide observation range and the ability to stare and image specific areas, geostationary orbit remote sensing cameras have been widely used in fields such as earth observation and space surveillance. Affected by the shock, vibration deformation and thermal deformation caused by the change of the incident angle of the sun when the satellite is launched, the geometric positioning model of the high-orbit remote sensing camera will change, thus affecting the final positioning accuracy of the camera. Therefore, it is often necessary to perform on-orbit calibration of the camera again. [0003] Affected by the altitude of the orbit, the temperature field around t...

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Application Information

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IPC IPC(8): G01C25/00
CPCG01C25/00
Inventor 陈凡胜孙胜利于清华林长青
Owner SHANGHAI INST OF TECHNICAL PHYSICS - CHINESE ACAD OF SCI
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