Simulation System Of Close-in Rendezvous For On-orbit Spacecraft

With the rise of the on-orbit service industry,spacecraft close rendezvous technology has also received more and more attention because of its application value in space monitoring,on-orbit refueling,and extended spacecraft life.According to the different tasks on orbit,the relative target spacecraft of the service spacecraft need to achieve different service configurations,such as hovering configuration and accompanying flight configuration.At the same time,in order to meet the configuration requirements,the service spacecraft needs to adjust its orbit through orbit maneuver.At the same time,with the rise of computer technology,using human-computer interaction software for orbit calculation,intersection algorithm calculation and task scene restoration can greatly improve the efficiency of operators.The purpose of this paper is to realize the simulation system of the close-in rendezvous service spacecraft.The system development is completed from the spacecraft dynamics modeling,spacecraft rendezvous algorithm design and spacecraft simulation software design.The main research content is as follows:To solve the problem of spacecraft dynamics modeling,the time system and coordinate system models are established to describe the time and coordinate systems corresponding to different parameters;the Kepler orbital element is a set of parameters used to describe the orbit of the spacecraft,which needs to be converted into the form of position and velocity vectors during the orbit calculation;the orbital dynamics model is established;then the orbit dynamics model was established,the two-body model and the high-precision model considering various perturbations were established,and different models can be selected according to the actual accuracy requirements;Aiming at the spacecraft rendezvous mission,a spacecraft relative motion model was established to describe the relative state of the serving spacecraft and the target spacecraft in the HILL coordinate system.Aiming at the relative motion configuration of the close-in spacecraft,the relative motion model is used to analyze the parameters affecting the relative configuration,and the relative motion is divided into the water hovering configuration and the accompanying flight configuration according to the influencing parameters.Water hovering is given a target spacecraft and waterdrop configuration period.In order to solve the service spacecraft orbit and maintain the waterdrop configuration orbit maneuver strategy that meets the requirements,a multi-objective optimization method is used to iteratively obtain the optimal performance function solution.For the accompanying flight configuration,it is divided into a fast-shift configuration for adjusting the accompanying flight scale and a mirror image phase-modulation configuration for relative adjustment according to different tasks.The configuration is analyzed by C-W analytical solution,and the orbit maneuver strategy is given.According to the actual requirements,the simulation software is divided into three modules: basic operation module,interface display module and scene display module.The basic operation module integrates the orbit dynamic model and the close-in rendezvous algorithm,and performs orbit calculation and algorithm verification through simulation calculation;The interface display module provides the human-computer interaction interface of the software to realize the functions of identity verification,parameter setting and result display;The scene display module restores simulation tasks through 2D and 3D animation scenes.During the implementation of the software,the database and network communication technology are introduced,so that the system can be deployed in a distributed manner,which improves the practicality of the software.