不确定性下的低轨卫星激光星间链路误差模型修正方法  

Updating Method for Error Model of Laser Interstellar Links in Low Earth Orbit Satellites Under Uncertainty

作　　者：武倩怡 张尧[1] 毛岸远 唐书雅 李新刚[2] WU Qianyi;ZHANG Yao;MAO Anyuan;TANG Shuya;LI Xingang(Beijing Institute of Technology,Beijing 100081,China;Institute of Telecommunication and Navigation Satellites,Beijing 100094,China)

机构地区：[1]北京理工大学,北京100081 [2]中国空间技术研究院通信与导航卫星总体部,北京100094

出　　处：《空间控制技术与应用》2024年第2期47-58,共12页Aerospace Control and Application

基　　金：国家自然科学基金资助项目(11972077)。

摘　　要：在工程应用中,激光链路构建过程不可避免地会受到各种不确定性的影响,导致激光建链在扫描过程中对指向区域估计不准,降低星间激光建链的准确性.因此,应多方面考虑不确定因素来修正低轨激光星间链路的动力学指向误差模型,为后期的扫描捕获提供基础.提出一种考虑不确定性因素的低轨卫星激光星间链路动力学指向误差模型修正方法,激光星间链路系统以及不确定参数进行描述,建立系统动力学模型;对不确定参数进行了灵敏度分析,并基于灵敏度指标,使用Kriging方法建立了原有系统动力学的代理模型,并验证模型预测精度;确定不确定性量化指标,使用贝叶斯随机模型修正技术对系统动力学模型不确定参数进行修正;通过数值仿真验证了不确定性下的星间链路指向误差动力学模型修正方法的有效性和可行性.This paper introduces a method for updating the pointing error model of the laser inter-satellite link dynamics in low-orbit satellites,addressing the challenges posed by uncertainty factors.In engineering applications,the construction of laser links is inherently influenced by a range of uncertainties,leading to inaccuracies in estimating the pointing area during the scanning process.This,in turn,compromises the precision of inter-satellite laser link establishment.Therefore,it is imperative to consider multiple uncertainties in rectifying the dynamic pointing error model of low-orbit laser interstellar links,laying the groundwork for subsequent scanning and capture procedures.The paper begins by delineating the laser interstellar link system and its associated uncertain parameters,subsequently establishing a system dynamics model.Following this,a sensitivity analysis is conducted on these uncertain parameters,leveraging sensitivity indicators to establish a surrogate model of the original system dynamics using the Kriging method.The prediction accuracy of this model is then thoroughly verified.Subsequently,uncertainty quantification indicators are determined,and Bayesian stochastic model updating techniques are employed to refine the uncertain parameters of the system dynamics model.Finally,the effectiveness and feasibility of this dynamic model correction method for addressing pointing errors in inter-satellite links under uncertainty are demonstrated through numerical simulations.

关 键 词：模型修正 星间激光建链 灵敏度分析 代理模型 

分 类 号：V474.2[航空宇航科学与技术—飞行器设计]