摘要
超低轨道自主轨控卫星由于大气阻尼摄动显著、地面难以获取星上自主轨控策略等原因,存在轨道确定不准和预报困难等问题,针对该类卫星的高精度轨道确定和预报问题,对超低轨道自主轨控卫星的技术难点进行了深入分析,提出了基于地面数字孪生系统的高精度轨道确定和预报技术,并对所提算法进行了仿真验证。统计分析结果表明:相比不使用自主轨控策略无动力轨道外推,基于星上下传自主轨控策略和地面数字孪生系统生成的轨控策略进行带动力轨道预报后,轨道预报精度显著提升,可以满足测站跟踪和碰撞预警的高精度需求。
For ultra-low orbit satellites with autonomous orbit control,due to significant atmospheric drag perturbations and the difficulty for the ground to obtain the on-board autonomous orbit control strategies,there are problems such as inaccurate orbit determination and difficult orbit prediction.This paper conducts research on the issues of high-precision orbit determination and prediction for this type of satellites,deeply analyzes the technical difficulties of ultra-low orbit satellites with autonomous orbit control,and designs a high-precision orbit determination and prediction technology based on the ground digital twin system.Finally,the proposed algorithm is verified through simulation.The statistical analysis results show that compared with the unpowered orbit extrapolation without autonomous orbit control,after conducting powered orbit prediction based on the autonomous orbit control strategy downloaded from the satellite and the orbit control strategy generated by the ground digital twin system,the orbit prediction accuracy is significantly improved,which can meet the high-precision requirements of station tracking and collision warning.
作者
任凯强
马晓菲
杜凯
张少愚
REN Kaiqiang;MA Xiaofei;DU Kai;ZHANG Shaoyu(State Key Laboratory of Space System Operation and Control,Xi′an Shaanxi 710043,China)
基金
国家自然科学基金资助项目(42074025)。
关键词
超低轨道
自主轨控
大气阻尼摄动
数字孪生系统
轨道确定
ultra-low orbit
autonomous orbit control
atmospheric drag perturbation
digital twin system
orbit determination
作者简介
任凯强(1989-),男,助理研究员,博士,主要研究方向为无源定位、精密轨道确定、定位误差校正。E-mail:KevinRen_THU@163.com。
