Satellite orbit maintenance and control method based on two lines of radicals

Abstract

The invention relates to a satellite orbit maintenance and control method based on two lines of radicals, which comprises the following steps of: calculating two lines of radical data disclosed by a satellite by utilizing a SGP4 orbit determination model, calculating and obtaining a geographical latitude and a geographical longitude of a sub-satellite point of the satellite and comparing with an agreed ground nominal track. Through taking the duration of a first sample opposite to an orbit epoch moment as an independent variable and taking the ground track distance difference as a variable, all samples are subjected to quadratic curve fitting by using an average method; the difference delta at between an actual value of a satellite orbit semi-major axis and a nominal value by a latest sample moment as well as the average attenuation rate of the satellite orbit semi-major axis within the time interval of the sample are calculated and obtained through a fitting polynomial coefficient; and finally, the next orbit control time Tc as well as the control quantity delta af required to be used are predicted and obtained by utilizing a fitted secondary curve and an allowable drift range [-delta Lmax and delta Lmax] to ensure that the position of an actual ground track within the satellite next drift period opposite to a ground nominal track is within the allowrable drift range.

Description

technical field [0001] The invention relates to a satellite orbit maintenance control method. Background technique [0002] During the satellite's orbit, due to the influence of atmospheric resistance, the trajectory of the sub-satellite point of the satellite drifts. For detailed survey and mapping satellites without side swing function or radar altimetry satellites with specific ground track spacing requirements, the orbit must be designed so that it can achieve global seamless coverage or To achieve strict track grid spacing requirements, it is necessary to carry out orbit maintenance control of the satellite, otherwise, after the satellite runs for a period of time in a free-drifting uncontrolled state, the track spacing will change, resulting in coverage leaks or track spacing jumping out grid requirements. [0003] Due to the uncertainty of solar activity and space environment, the prediction of the density of the upper atmosphere is still not accurate enough, so tha...

AI Technical Summary

Problems solved by technology

Since the satellite orbit measurement unit has the advantage of specific orbit data, there are sufficient samples for analysis of the attenuation of the satellite orbit, and the statistics of the semi-major axis changes of Kepler's six roots can be directly calculated, although it has been verified by satellites in orbit , but this method of forecasting based on the six root numbers of the satellite's real orbit still has strong limitations such as objects of use and satellite ownership.

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