High-precision joint orbital transfer method for engines

Abstract

A high-precision joint orbital transfer method for engines includes a first step of configuring three types of engines, a second step of determining a starting up threshold dvA of an engine A according the minimum starting up time and aftereffects of the engine A and determining a starting up threshold dvB of an engine B according to capacity of an engine C and an additional impulse produced through attitude maneuver of the engine C, a third step of receiving orbit control information sent by the ground by a spacecraft on orbit, and a fourth step of selecting an orbit control mode according to corresponding engine starting up thresholds determined in the second step and an orbit control velocity increment in the third step, wherein the orbit control information includes the orbit control velocity increment dv, velocity increment directions which are expressed by a pitch angle a1 and a pitch angle a2, and a starting up moment t. The fourth step particularly includes the following steps of utilizing an AB joint orbital transfer mode if the orbit control velocity increment dv is larger than the dvA, utilizing a B engine orbital transfer mode if the orbit control velocity increment dv is less than or equal to the dvA but larger than the dvB, and utilizing a transversely-moving engine orbital transfer mode when the velocity increment is less than or equal to the dvB.

Description

technical field [0001] The invention relates to a high-precision orbit control engine joint orbit change method used in the process of space rendezvous and docking orbit change, which can be used for the development of rendezvous and docking GNC control systems, and can also be popularized and applied to other spacecraft with high requirements for orbit control precision Control scheme design. Background technique [0002] Space rendezvous and docking refers to the entire flight process in which two spacecraft meet (rendezvous) at a predetermined position, speed, and time in orbit, and then align and move closer through attitude alignment until they are structurally connected as one (docking). The two spacecrafts performing rendezvous and docking in space are usually called a target vehicle (referred to as a target vehicle), and the other is called a tracking vehicle (referred to as a tracker). During the rendezvous and docking process, the tracker is active, and the rendez...

AI Technical Summary

Problems solved by technology

Due to the deviation between the actual thrust and the nominal thrust of the on-orbit engine, and the attitude control is also performed during the orbit control process, the control accuracy of the time shutdown is worse than that of the speed increment shutdown, and it cannot meet the requirements of the rendezvous and docking orbit control.

Images