초록

Provided is a method for estimating and calibrating an absolute misalignment between an attitude control sensor of a satellite or a flight vehicle imaging and transmitting ground images having high resolution and an imaging payload.

대표청구항 ▼

1. A method for estimating and calibrating an absolute misalignment of a satellite or a flight vehicle imaging ground images at high resolution and transmitting the imaged ground images to a ground, the method comprising: a ground control point imaging and comparing operation in which a plurality of

1. A method for estimating and calibrating an absolute misalignment of a satellite or a flight vehicle imaging ground images at high resolution and transmitting the imaged ground images to a ground, the method comprising: a ground control point imaging and comparing operation in which a plurality of ground control points of which accurate position information is known are each imaged using an image payload using a linear array sensor and position information of the ground control points in a plurality of imaged images and position information of the ground control points which are already known are then compared with each other;an absolute misalignment estimation value calculating operation of estimating an absolute misalignment value between an attitude control sensor and the image payload by applying a method for estimating the absolute misalignment using an image obtained by a plane image sensor to information obtained by performing the ground control point imaging and comparing operation;a calibrating operation of calibrating the absolute misalignment by applying the calculated absolute misalignment estimation value to attitude control sensors; andwherein the information obtained by the ground control point imaging and comparing operation is transformed to have a form of the following Equation 6 by dividing and re-disposing the information into a time-varying term and a time-invariant term MBodyPL{circumflex over (V)}i=Ŵi  [Equation 6] V^i=MECIBody⁢MECEFECI⁡[Xi-XiSYi-YiSZi-ZiS]ECEFwherein W^i=[0Yif]Image and it is assumed that all vectors are normalized. 2. The method of claim 1, wherein a method for calculating an attitude of the plane image sensor using an image of a target obtained by the plane image sensor is any one of a DAVENPORT algorithm and a QUEST algorithm among methods for minimizing an objective function defined as the following Equation 2 J⁡(A)=12⁢∑i=1N⁢⁢W^i-A⁢V^i2[Equation⁢⁢2]wherein J(A) is an objective function, A is a coordinate transformation matrix of the plane image sensor, N is the number of targets in the imaged image, and Ŵi is a position vector of the imaged image, and {circumflex over (V)}i is a direction vector in an inertia coordinate system of the target. 3. The method of claim 1, wherein the absolute misalignment estimation value MBodyPL is calculated by the Equation 6 and new attitudes of the attitude control sensors are calculated by the following Equation 10 MBodyS(new)=MBodyS(old)(MBodyPL)T  [Equation 10]wherein a superscript S shows the attitude control sensor.