Space-air-ground two-dimensional pointing mechanism for low Earth orbit (LEO) or medium Earth orbit (MEO) spacecraft, and tracking method implemented by pointing mechanism

Abstract

The invention belongs to the technical field of overall spacecraft designing, and relates to a space-air-ground two-dimensional pointing mechanism for a low Earth orbit (LEO) or medium Earth orbit (MEO) spacecraft. The space-air-ground two-dimensional pointing mechanism comprises an electric control box, a two-dimensional pointing mechanism with orthogonal driving shafts, and a pointing platform used for installation of the two-dimensional pointing mechanism, wherein the pointing mechanism is provided with two rotation angles; and a base of the mechanism can be arranged in an Xb direction or aYb direction of the spacecraft. The space-air-ground two-dimensional pointing mechanism provided by the invention has the advantages that space pointing, air pointing and ground pointing of the LEO or MEO spacecraft can be completed, that is, pointing of the LEO or MEO spacecraft to a relay satellite, other LEO or MEO spacecrafts and a ground station can be completed, only through the single two-dimensional pointing mechanism, so that the spacecraft integration level can be greatly improved, the spacecraft size can be reduced, and the spacecraft cost can be lowered; and the pointing mechanismcan be flexibly used and can be provided with multiple pointing correction measures, so that the characteristics of high pointing precision and high simplicity in use can be achieved.

Description

technical field [0001] The invention relates to the technical field of overall design of spacecraft, in particular to a space-ground two-dimensional pointing mechanism and a tracking method for a medium-low orbit spacecraft. Background technique [0002] With the development of high-resolution remote sensing technology, the on-orbit data code rate of spacecraft is getting higher and higher. More and more spacecraft on-orbit data transmission schemes use point-beam antennas or laser communication and other pointing data transmission schemes. The instrument has a two-dimensional pointing mechanism for tracking the pointing of the ground station. [0003] Secondly, the time for medium and low orbit spacecraft to pass over the domestic ground station is very short every day. For the territory of our country, it can generally fly over 4 orbits in the territory every day, and each orbit usually only takes about 10 minutes. Under the limited data transmission code rate, the effecti...

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Problems solved by technology

[0007] Aiming at the defects of the prior art, the object of the present invention is to provide a space-ground two-dimensional pointing mechanism for a medium-low orbit spacecraft and its tracking method, which overcomes the oversimplification of the functions of the two-dimensional pointing mechanism of the existing spacecraft and the need for multiple pairs of different functions. Insufficiency of two-dimensional pointing mechanism

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