Ultra-low orbit satellite all-electric propulsion orbit maintenance system

Abstract

An ultra-low orbit satellite all-electric propulsion orbit maintenance system comprises a GNSS receiver, an atmospheric density measurement unit, a satellite service management unit and an electric propulsion system. The GNSS receiver provides a state vector of the ultra-low orbit satellite in an earth-fixed coordinate system. And the atmospheric density detection unit obtains atmospheric density data and inverts the orbit height of the ultra-low orbit satellite. And the electric propulsion system completes distribution of thrust parameters and generation of a thrust according to an orbit maintenance control law transmitted by the satellite service management unit. The satellite service management unit comprehensively determines orbit information of an ultra-low orbit satellite, generates a satellite space trajectory error after processing, further determines an orbit maintenance control law through an orbit maintenance algorithm according to the satellite space trajectory error, and sends the orbit maintenance control law to the electric propulsion system to complete orbit maintenance control. According to the invention, the problem of rapid attenuation of the satellite in the ultra-low orbit flight is solved, stable flight of the satellite in the ultra-low orbit is realized, and the operation duration of the ultra-low orbit satellite is greatly prolonged.

Description

technical field [0001] The invention belongs to the field of overall design of spacecraft, and relates to an orbit maintenance system for ultra-low orbit satellites. Background technique [0002] Ultra-low-orbit satellites generally refer to satellites operating below an orbital altitude of 300 kilometers. Deploying satellites in this orbit can greatly shorten the distance between the load and the ground, thereby improving the work efficiency of the load. It is the focus of attention of space powers or organizations such as the United States, Japan, and the European Space Agency. [0003] Satellites operate in ultra-low orbits and face the problems of high atmospheric density and high aerodynamic resistance during flight, which requires satellites to have the ability to maintain orbits. The early use of chemical propulsion for orbit maintenance required a large amount of chemical fuel consumption, and it was difficult for satellites to achieve long-term orbit maintenance. I...

AI Technical Summary

Problems solved by technology

[0005] The technical problem solved by the present invention is: aiming at the requirement that satellites need real-time acquisition of flight resistance and real-time adjustment of electric thruster thrust for the maintenance of drag-free orbit, it overcomes the shortcomings of complex satellite system configuration and high requirements for electric propulsion, and provides a method that does not require real-time acquisition. The orbit maintenance method of flight resistance and real-time adjustment of electric thruster thrust uses low-cost GNSS and atmospheric density measurement units as orbit measurement equipment instead of high-cost electrostatic gravitational gradiometers as orbit measurement equipment, which reduces the cost of orbit measurement , using electric propulsion without thrust real-time adjustment to realize the system configuration of long-term stable flight of satellites in ultra-low orbits below 300km, which solves the problem of rapid attenuation of satellite orbits in ultra-low orbits, and realizes stable flights of satellites in ultra-low orbits. Extend the operating time of ultra-low orbit satellites and enhance the application efficiency of ultra-low orbit satellites

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