Space station short-term mission planning using ontology modelling and time iteration

This paper studies the problem of the space station short-term mission planning, which aims to allocate the executing time of missions effectively, schedule the corresponding resources reasonably and arrange the time of the astronauts properly. A domain model is developed by using the ontology theory to describe the concepts, constraints and relations of the planning domain formally, abstractly and normatively. A method based on time iteration is adopted to solve the short-term planning problem. Meanwhile, the resolving strategies are proposed to resolve different kinds of conflicts induced by the constraints of power, heat, resource, astronaut and relationship. The proposed approach is evaluated in a test case with fifteen missions, thirteen resources and three astronauts. The results show that the developed domain ontology model is reasonable, and the time iteration method using the proposed resolving strategies can successfully obtain the plan satisfying all considered constraints.

Cutting-Edge Space Exploration Technology Maturity Level Facilitation with Support of Space Debris Removal Missions

Considering current space debris situation in outer space environment,different methods for debris removal missions are proposed.In addition,advanced technologies are needed to be demonstrated for future human space exploration programs.The main issue regarding to these missions is high mission cost for both debris removal missions and space environmental tests to achieve high maturity level for new space-usable technologies.Since,these missions are unavoidable for future of human space activities,a solution which can tackle these challenges is necessary.This paper will address to an idea which has the possibility to give a solution for facilitating technology readiness level(TRL)maturity tests by debris removal mission platform consideration.

Estimation of far-field wavefront error of tilt-to-length distortion coupling in space-based gravitational wave detection

In space-based gravitational wave detection, the estimation of far-field wavefront error of the distorted beam is the precondition for the noise reduction. Zernike polynomials are used to describe the wavefront error of the transmitted distorted beam. The propagation of a laser beam between two telescope apertures is calculated numerically. Far-field wavefront error is estimated with the absolute height of the peak-to-valley phase deviation between the distorted Gaussian beam and a reference distortion-free Gaussian beam. The results show that the pointing jitter is strongly related to the wavefront error. Furthermore, when the jitter decreases 10 times from 100 nrad to 10 nrad, the wavefront error reduces for more than an order of magnitude. In the analysis of multi-parameter minimization, the minimum of wavefront error tends to Z[5,3] Zernike in some parameter ranges. Some Zernikes have a strong correlation with the wavefront error of the received beam. When the aperture diameter increases at Z[5,3] Zernike, the wavefront error is not monotonic and has oscillation.Nevertheless, the wavefront error almost remains constant with the arm length increasing from 10-1Mkm to 10~3Mkm.When the arm length decreases for three orders of magnitude from 10-1Mkm to 10-4Mkm, the wavefront error has only an order of magnitude increasing. In the range of 10-4Mkm to 10~3Mkm, the lowest limit of the wavefront error is from 0.5 fm to 0.015 fm at Z[5,3] Zernike and 10 nrad jitter.

Timeline based autonomous mission planning system for deep space exploration

In order to realize the explorer autonomy, the software architecture of autonomous mission management system (AMMS) is given for the deep space explorer, and the autonomous mission planning system, the kernel part of this architecture, is designed in detail. In order to describe the parallel activity, the state timeline is introduced to build the formal model of the planning system and based on this model, the temporal constraint satisfaction planning algorithm is proposed to produce the explorer’s activity sequence. With some key subsystems of the deep space explorer as examples, the autonomous mission planning simulation system is designed. The results show that this system can calculate the executable activity sequence with the given mission goals and initial state of the explorer.

Spatio-Temporal Polar-Inclined Space Mission Architecture for a Refined Retrieve of the Earth’s Gravity Field

Future satellite gravity missions (FGMs) have been intensively studied during the last recent years for the era beyond the successful previous GRACE and current GRACE Follow-on satellite missions. Previous studies have investigated the gravity field recovery derived from combined two satellite-pairs (referred here as PI-FGM, a single polar satellite-pair like the GRACE mission combined with another inclined satellite-pair) with different orbital heights of few kilometers and different repeat orbital periods. In this contribution, new innovative idea is introduced by designing the inclined satellite-pair of the FGM at the same orbital height of the polar-type with shifted spatio-temporal (ST-FGM) orbital parameters to avoid any possible collision risk between the two satellite-pairs, polar and inclined, of the FGM architecture. The repeat orbits issue will be taken into consideration through the manuscript and will be set as identical as possible for a fair comparison. The findings through a full-scale simulation analysis show that the new design of shifted spatio-temporal polar-inclined (ST-FGM) mission architecture basically outperforms the two satellite-pairs having different orbital heights (i.e. the PI-FGM mission configuration). Regarding the gravity field recovery, the ST-FGM architecture retrieves the geoid heights with standard deviations of about 17.0 mm providing more isotropic error distribution. An overall improvement by a factor of about 80 and 60 is provided by the ST-FGM and PI-FGM mission architectures, respectively, with respect to the GRACE-like formation and a factor of about 2.4 and 1.8, respectively, with respect to the smoothed gravity solution using the Gaussian filter at radius 400 km. Therefore, the shifted spatio-temporal polar-inclined (ST-FGM) is worthy recommended as stable mission architecture and would be considered as one of the future gravity missions.

Coupled Dynamics and Integrated Control for Position and Attitude Motions of Spacecraft:A Survey

Inspired by the integrated guidance and control design for endo-atmospheric aircraft,the integrated position and attitude control of spacecraft has attracted increasing attention and gradually induced a wide variety of study results in last over two decades,fully incorporating control requirements and actuator characteristics of space missions.This paper presents a novel and comprehensive survey to the coupled position and attitude motions of spacecraft from the perspective of dynamics and control.To this end,a systematic analysis is firstly conducted in details to show the position and attitude mutual couplings of spacecraft.Particularly,in terms of the time discrepancy between spacecraft position and attitude motions,space missions can be categorized into two types:space proximity operation and space orbital maneuver.Based on this classification,the studies on the coupled dynamic modeling and the integrated control design for position and attitude motions of spacecraft are sequentially summarized and analyzed.On the one hand,various coupled position and dynamic formulations of spacecraft based on various mathematical tools are reviewed and compared from five aspects,including mission applicability,modeling simplicity,physical clearance,information matching and expansibility.On the other hand,the development of the integrated position and attitude control of spacecraft is analyzed for two space missions,and especially,five distinctive development trends are captured for space operation missions.Finally,insightful prospects on future development of the integrated position and attitude control technology of spacecraft are proposed,pointing out current primary technical issues and possible feasible solutions.

面向战区联合作战的空间需求响应任务规划

针对战区联合作战中的空间需求响应问题,描述了面向战区联合作战的空间需求响应任务规划的背景;从空间资源能力、空间需求响应机制、空间需求响应效益和代价等方面,分析了空间需求响应任务规划所需考虑的主要因素;定义并描述了任务规划模型,设计了任务规划计算方法,并结合战区联合作战实际进行了案例仿真与分析,验证了模型和方法的有效性,为战区联合作战中空间需求的有效响应提供了理论和方法支撑。

航天任务分析与设计工业软件发展战略分析

航天工业设计软件是我国航天事业当前亟需重点攻克的“卡脖子”技术领域。航天任务分析与设计软件是航天任务全寿命周期的关键软件,是航天工业设计软件体系中主根系软件。本文首先对其中最具代表性的软件产品——美国STK的发展历程、主要功能特点进行总结剖析;在此基础上从模型算法创新、软件协作开发和数字化发展趋势等方面概括STK的发展启示;进一步通过该类软件的特点分析,结合探索实践历程,对国产软件替代的可行性进行分析研判;最后提出了我国自主软件的发展思考和对策建议,包含软件研发模式、软件推广与应用、国家政策支持等方面。

国际空间站舱外多载荷运行任务规划

空间站舱外载荷平台支持部署众多不同类型的载荷,为开展大规模空间科学研究提供了机会.但随着舱外载荷数量及相应任务量的不断增加,且在受限于资源约束的情况下,需要制定科学合理的任务规划,以提高舱外载荷的工作效率.针对舱外多载荷运行任务规划方法,深入分析了国际空间站舱外载荷任务规划现状,重点分析了其舱外载荷平台、载荷类型及特点和多载荷运行任务规划方法,分析当前任务规划策略、方法及未来发展方向.根据中国空间站舱外载荷平台特点,从载荷总体设计和运行任务规划方法等方面为中国空间站后续舱外多载荷系统运行任务规划提供参考和建议.

载人月球探测混合云架构体系仿真系统研究

针对载人月球探测工程任务需求,设计了一种基于混合云架构的体系仿真系统,实现了辅助设计、方案验证和协助任务等功能应用。分别从任务设计和应用模式角度分析了体系仿真系统功能需求;根据需求给出体系仿真系统总体架构,采用仿真平台和仿真支持库统筹建设的方式,完成了系统开发与集成;提出了针对体系仿真系统建设涉及的体系建模、任务规划、推演展示、效能评估和系统联动与扩展关键技术实现方案;应用该系统实现了对典型载人月面活动场景的仿真,得到了关键参数模拟推演结果,验证了体系仿真系统各项功能有效性和正确性;最后给出了思考和展望。该体系仿真系统可支撑未来载人月球探测相关任务开展发展论证和综合评估验证,能够为同类系统开发提供方案参考。

基于任务效能评价张量进化的航天器任务规划

航天器在空间探索时需要面对各种多任务场景,复杂的任务耦合关系和航天器轨迹约束给任务规划带来困难。本文提出了基于任务效能评价张量进化的航天器任务规划方法,利用张量形式来描述任务规划中任务点间转移轨迹与前序任务集的耦合关系,精确地评价不同任务规划方案下的转移轨迹代价和任务收益,从而有效地提高了任务规划效能,并极大缩减了任务规划的计算量。

航天任务系统容灾备份技术应用

传统航天任务系统面临多代并存、部署不灵活、容灾手段不完善、应急切换速度慢等问题,难以适应后续云架构下一体化融合管控模式,必须解决容灾备份体系设计和系统级迁移切换难题。分析了传统航天任务系统存在的安全风险和特点规律,设计了云架构下异地容灾备份体系,提出了虚拟化迁移、网络层控制改造、应用层域名改造、通信配置集成管理等解决方法,形成了迁移部署流程和快速切换建链方法。试验表明,相比传统备份手段,云架构下异地容灾备份系统能够有效缩短系统级部署与切换时间至3小时,明显提升异常应对能力,可为后续一体化管控模式下容灾备份体系建设与特殊场景应用提供技术支持。

长期隔离和受限环境任务成员的心理调节进展

由于客观环境刺激源的影响,处于隔离和受限环境(ICE)中的个体容易出现负面情绪和心理压力,具有强烈的孤立和分离感。了解长期ICE任务对个体心理健康的影响及心理调节的方法和机制,有利于提高成员的心理健康水平,帮助他们更好地适应环境、完成任务。通过分析个体对ICE的应对策略、适应技能、情绪调节及团队管理策略,可以将长期ICE任务的心理调节大致分为任务前准备、任务中支持和任务后重新适应3个阶段。使用心理健康检查表、隔离和受限环境问卷(ICE-Q)等量表进行监测,实施促进积极情绪和任务导向策略,发挥心理弹性的中介作用,培养适宜的幽默感,以及团队间有效的沟通和冲突管理,都是适应ICE的重要方法。

美军太空作战任务式指挥探析

当前美军正加速太空军事力量转型发展,其太空军已明确将任务式指挥作为太空作战指挥控制的基本原则。阐述了任务式指挥的概念及内涵,辨析了任务式指挥与指挥控制的关系,分析了美军在太空领域推行任务式指挥的缘由。通过研究美军太空作战任务式指挥在文化、系统、组织和力量等方面的经验,得出了对我国太空领域适应未来智能化战争的启示,从而为加快太空领域指挥控制转型发展提供参考。

Progress of Solar Wind Magnetosphere Ionosphere Link Explorer(SMILE) Mission

SMILE(Solar wind Magnetosphere Ionosphere Link Explorer) mission is a joint ESA-CAS space science project. The working orbit is a 19 Re 5000 km HEO with 4 scientific instruments: Soft X-ray Imager(SXI), Ultra-Violet Imager(UVI), Magnetometer(MAG) and Light Ion Analyzer(LIA). SMILE aims to understand the interaction between the solar wind and the Earth's magnetosphere through the images of SXI and UVI and in-situ measurement from LIA and MAG. After the kick-off in 2016, the SMILE project went to Phase A study. The mission adoption is scheduled for November 2018, with a target launch date in 2022–2023.In this paper, the background of the mission, scientific objectives, the design and characteristics of scientific instruments and the mission outline will be introduced in details.

Progress and Prospects of the Strategic Priority Program on Space Science

In May 2018,the second phase of the Strategic Priority Program on Space Science(SPP II)was officially approved by the Chinese Academy of Sciences,in view of the significant scientific achievements of the first phase of the Strategic Priority Program on Space Science(SPP I)which includes 4 space science missions:the Dark Matter Particle Explorer(DAMPE),ShiJian-10(SJ-10),Quantum Experiments at Space Scale(QUESS)and Hard X-ray Modulation Telescope(HXMT).Aiming to address fundamental scientific questions,SPP II focuses on two major themes:How the universe and life originate and evolve and What is the relationship between the solar system and human beings.In areas that Chinese scientists have advantages,new space science missions including Graviational wave high-energy Electromagnetic Counterpart All-sky Monitor(GECAM),the Advanced space-based Solar Observatory(ASO-S),the Einstein Probe(EP),and Solar wind Magnetosphere Ionosphere Link Explorer(SMILE)have been approved in the framework of SPP II.This paper presents the research highlights of the SPP I,introduces the recent progress of SPP II,and puts forward the prospects for future development.

China's Space Science Program(2025-2030):Strategic Priority Program on Space Science(Ⅲ)

The Strategic Priority Program(SPP)on Space Science,which is under the leadership of the Chinese Academy of Sciences(CAS),has established China’s space science satellite series from scratch.A number of major scientific achievements have been made by the first phase of the Program(SPPⅠ),while SPPⅡhas been currently being implemented.The future development of space science needs urgent top-level planning and advanced layout to clarify the overall goal and investment portfolio from 2025 to 2030.We will briefly introduce the initiative and possible space science missions of SPPⅢ,including the preparatory work which already started in July 2021.Following the effective administrative tradition since SPPⅠ,National Space Science Center(NSSC,CAS)is responsible for the whole procedure,including soliciting,assessment,and implementation of SPPⅢ.Brief information on the 13 candidate missions will be described,including missions in the fields of astronomy&astrophysics,exoplanets,heliophysics and planetary&Earth science,respectively.

Strategic Study on the Development of Space Science in China and Proposals for Future Missions

Since 2011,the Chinese Academy of Sciences(CAS)has implemented the Strategic Priority Program on Space Science(SPP).A series of scientific satellites have been developed and launched,such as Dark Matter Particle Explorer(DAMPE),Quantum Experiments at Space Scale(QUESS),Advanced Space-based Solar Observatory(ASO-S),Einstein Probe(EP),and significant scientific outcomes have been achieved.In order to plan the future space science missions in China,CAS has organized the Chinese space science community to conduct medium and long-term development strategy studies,and summarized the major scientific frontiers of space science as“One Black,Two Dark,Three Origins and Five Characterizations”.Five main scientific themes have been identified for China’s future breakthroughs,including the Extreme Universe,Space-Time Ripples,the Panoramic View of the Sun and Earth,the Habitable Planets,and Biological&Physical Science in Space.Space science satellite missions to be implemented before 2030 are proposed accordingly.

载人月球探测轨道设计的挑战与技术发展趋势

轨道设计是载人月球探测工程中的一个重要问题,直接影响工程实施的效果、甚至成败。本文概述了载人月球探测工程中涉及的飞行轨道,指出了轨道设计所面临的三方面挑战,即飞行轨道方案、轨道设计效率、任务全局最优化的挑战;简要介绍了国内外载人月球探测轨道设计的研究进展;提出了当前载人月球探测轨道设计需要重点突破的几个关键技术问题,包括一体化轨道设计与优化、应急任务轨道设计、地月空间任务高鲁棒性轨道设计、月球轨道空间站的轨道设计和地月空间轨道通用设计软件等问题。

Achievements of Space Scientific Experiments Aboard SJ-8 Satellite

As scientific experiment payloads,microgravity experiments of fluid physics,life science,combustion science,physics and accelerator measurement were conducted on board the Chinese recoverable satellite SJ-8 during 18-day orbital flight.The experimental payloads and an experiment support system constituted the microgravity experiment system of the flight mission.This article has presented the briefs of the scientific achievements of these space experiments,the composition and performance of the Microgravity Experimental System(MES) and the general picture of the overall flight mission,respectively.