Acquisition method of inclination biased quantity for sun synchronous orbit

Abstract

The invention discloses an acquisition method of inclination biased quantity for sun synchronous orbit. The method comprises the following steps: 1, correcting an initial value i0 of an orbit inclination by virtue of a correction value delta I of the initial value of the orbit inclination; 2, establishing an ordinary differential equation to acquire an orbit inclination at moment t and orbit right ascension of ascending node, and variation delta LTDN of local time of descending node at moment t; 3, judging the orbit drifting direction, wherein the biased quantity of the orbit inclination is negative if the direction is toward east, while the biased quantity of the orbit inclination is positive if the direction is toward west; and 4, traversing inclination biased quantities with step length of 0.0001 degree in a range from 0.0 to 0.1 degree, and respectively adding the corrected initial value of the sun synchronous orbit inclination in the step 1 to serve as an orbit initial value with inclination biased quantity, and carrying out the step 2 to obtain the variation of the local time of descending node at the moment t, arranging the maximum values of absolute values of variations into vectors according to a sequence, and the minimum value in the vectors is the inclination biased quantity. According to the method, the defect of low calculation accuracy of inclination biased quantity of the conventional sun synchronous orbit inclination biased quantity is overcome, and the orbit control capability is effectively improved.

Description

technical field [0001] The invention relates to an inclination biasing method suitable for sun-synchronous orbits, especially suitable for high-precision forecasting at the descending node of the sun-synchronous orbits. Background technique [0002] Most remote sensing satellites in low-Earth orbit adopt sun-synchronous orbits. The first feature of the sun-synchronous orbit is: the local time when the satellite passes the same latitude in the same direction is constant; the second feature is: the range of angle between the sun's rays and the orbit is relatively small. [0003] Due to the influence of atmospheric drag on such orbits, the semi-major axis of the orbit will decay, and the resulting shortening of the orbital period will cause the position of the ground track to drift eastward. The sun-synchronous orbit will also be affected by the sun's gravity, and the orbital inclination will produce long-term changes. Long-term changes in inclination further lead to correspo...

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Problems solved by technology

[0003] Due to the influence of atmospheric drag on this type of orbit, the semi-major axis of the orbit will decay, and the resulting shortening of the orbital period will cause the position of the ground track to drift eastward

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