Digital Simulation Platform for Satellite Launch Mission Verification

To simulate the satellite launch mission under a general platform which could be used in a full-digital mode as well as in a semi-physical way, is an important way to certify the mission design performance as well as technical feasibilities, and it relates to complex system simulation methods such as multi-disciplinary coupling, multi-language modeling as well as interactive simulation and virtual simulation technologies. This paper introduces the design of a digital simulation platform for satellite launch mission verification.The platform has the advantages of high generality and extensibility, being easy to build up. The Functional Mockup Interface(FMI) Standard is adopted to achieve integration of multi-source models. A WebGL based 3D visual simulation tool is also adopted to implement the virtual display system which could display the rocket launch process and rocket-satellite separation with high fidelity 3D virtual scenes. A configuration tool was developed to map the 3D objects in the visual scene with simulation physical variables for complex rocket flight control mechanisms, which greatly improves the platform's generality and extensibility. Finally the real-time performance had been tested and the YL-1 launch mission was adopted to demonstrate the functions of the platform.The platform will be used to construct a digital twin system for satellite launch missions in the future.

Satellite and high altitude platform-based inter-vehicle communications in vast and desolate areas

In order to solve the problem of inter-vehicle communication （IVC） in vast and desolate areas such as the desert and the Gobi, two vehicle network models are proposed. One is based on satellite communication and the other is based on high altitude platform （ HAP ） communication. The system outline and networking modes of the two models are described. In the satellite communication based model, all the vehicles are equipped with vehicle-bone satellite communication on the move terminals and the communication signals between vehicles are forwarded by satellite. In the high altitude platform-based model, the HAPs are equipped with base station facilities to form aerial base stations, and vehicles can communicate with each other via common terrestrial mobile communication devices. Some key parameters such as path loss, link loss and system capacity are also computed. The analysis shows that both the two models can satisfy the requirement of IVC in the descriptive environment.

Low Altitude Satellite Constellation for Futuristic Aerial-Ground Communications

This paper discusses the significance and prospects of low altitude small satellite aerial vehicles to ensure smooth aerial-ground communications for next-generation broadband networks.To achieve the generic goals of fifthgeneration and beyondwireless networks,the existing aerial network architecture needs to be revisited.The detailed architecture of low altitude aerial networks and the challenges in resource management have been illustrated in this paper.Moreover,we have studied the coordination between promising communication technologies and low altitude aerial networks to provide robust network coverage.We talk about the techniques that can ensure userfriendly control and monitoring of the low altitude aerial networks to bring forth wireless broadband connectivity to a new dimension.In the end,we highlight the future research directions of aerial-ground communications in terms of access technologies,machine learning,compressed sensing,and quantum communications.

A new type of Shipboard Meteorological Satellite Receiving-processing System

The Shipboard Meteorological Satellite Receiving-processing System (SMSRPS) is specially developed for the navigation meteorological safeguard of the Antarctic exploration ship over the sea ice area of the forth Ocean. This system can suit to the climate environment of very high temperature high moisture and very low temperature - supersaturation; it has a self-protection ability to against the hurricane - force wind over force 12 and the strong vibration during icebreaking, as well as strong magnetic disturbance. It has two sets of receiving-imagery processing systems for polar orbit low-resolution and quasi-stationary high-solution satellites. The key creation Points of this system are as follows: 1. the active gyro-control stabilization platform and a mixed mounting system of three rotating a - B and x -- y axes are used. It solved the tracing difficulties both in the low elevation angle and very high elevation angle of polar-orbit satellite, even in the status of ship moving with continuously changing its poition, direction and ship roll and pitch. 2. Imagery processing subsystem. The newest BORLAND-- DELPHI language and PASCAL language pro gramming software are used under WINDOWS 95 environment. It has a dynamic positioning nested-grid system and electric mapping grid data system. It can show the latitude-longitude of any point on the map, and marks any object such as ship, station or island, and draws the route. It can monitor cloud and temperature, forest fire, anomalous change of ocean and land. It can output satellite cloud maps of 24 bit with very high clarity. This system is very advanced in technique for the whole structure with the features of small volume, light weight and very low cost. It suits to very bad climate and ocean environment. Its imagery process ing system has complete functions with high resolution and being very easy to operate. It is not only suit to land use, but also and specially to all kinds of ship over the sea. It can be extended to domestic and international use. This system played a very important role in the 14th Chinese Antarctic Exploration Navigation, and was introduced a broad attention paid by Chinese newspapers and TV Stations.

Efficient and fair PPO-based integrated scheduling method for multiple tasks of SATech-01 satellite

SATech-01 is an experimental satellite for space science exploration and on-orbit demonstration of advanced technologies.The satellite is equipped with 16 experimental payloads and supports multiple working modes to meet the observation requirements of various payloads.Due to the limitation of platform power supply and data storage systems,proposing reasonable mission planning schemes to improve scientific revenue of the payloads becomes a critical issue.In this article,we formulate the integrated task scheduling of SATech-01 as a multi-objective optimization problem and propose a novel Fair Integrated Scheduling with Proximal Policy Optimization(FIS-PPO)algorithm to solve it.We use multiple decision heads to generate decisions for each task and design the action mask to ensure the schedule meeting the platform constraints.Experimental results show that FIS-PPO could push the capability of the platform to the limit and improve the overall observation efficiency by 31.5%compared to rule-based plans currently used.Moreover,fairness is considered in the reward design and our method achieves much better performance in terms of equal task opportunities.Because of its low computational complexity,our task scheduling algorithm has the potential to be directly deployed on board for real-time task scheduling in future space projects.

Construction and implementation of RS integrated application information system of China's coastal zone and offshore

The coastal zone and offshore are clearly of major economic and social importance, in thesame time it causes a series of problems of resources and ecosystem too. The research on and development of integrated application techniques for remote sensing provide not only a microcosmic and dynamic and synchronous technical means to the monitor, but also an integrated technical scheme to harmonically solve the ecological environment problem. The system is designed to focus on the application techniques of multi-sources remote sensing data. By developing remote sensing information extraction module, integrated user platform, and application module objected to the real ocean procedure for China' s coastal zone and offshore, the information system consists of the management of prodigious amount of data, display, analysis, simulation and output will be constructed and implemented. The final objective is to transform the research on ocean remote sensing into application.

Current Status and Main Scientific Outcomes of the CSES Mission

This report briefly introduces the current status of the CSES(China Seismo-Electromagnetic Satellite)mission which includes the first satellite CSES 01 in-orbit(launched in February 2018),and the second satellite CSES 02(will be launched in 2023)under development.The CSES 01 has been steadily operating in orbit for over four years,providing abundant global geophysical field data,including the background geomagnetic field,the electromagnetic field and wave,the plasma(in-situ and profile data),and the energetic particles in the ionosphere.The CSES 01 platform and the scientific instruments generally perform well.The data validation and calibration are vital for CSES 01,for it aims to monitor earthquakes by extracting the very weak seismic precursors from a relatively disturbing space electromagnetic environment.For this purpose,we are paying specific efforts to validate data quality comprehensively.From the CSES 01 observations,we have obtained many scientific results on the ionosphere electromagnetic environment,the seismo-ionospheric disturbance phenomena,the space weather process,and the Lithosphere-Atmosphere-Ionosphere coupling mechanism.

Multipath Cognitive Routing in Integrated Multicast Satellite-HAP System Structures

A new multilayered inter satellite-high altitude platform （HAP） system routing algorithm is proposed,which is mainly based on multipath routing to ensure the network reliability.The proposed multipath routing scheme principally relies on splitting the traffic between different paths to make the best utilization of multiple routes.Linear programming is the main method used for multipath selection.The major constraints to the quality of service （QoS） （delay and link utilization） have been taken into account to meet the criteria of the advanced multimedia applications.Due to the effect of link utilization,the system encounters traffic flow oscillation between paths over time,which affects the system performance.Hence,to fix this issue,we propose a cognitive routing algorithm which reacts to the long-term changes of the traffic loads rather than short-term ones.The performance of the proposed routing techniques has been evaluated using appropriate simulation models and implemented by Matlab.

基于Android平台的弱势群体监护帮助系统的设计与实现

随着我国北斗卫星导航系统于2012年底正式对亚太地区提供无源定位、导航、授时服务,卫星导航定位技术逐渐在日常工作和生活中扮演了愈来愈重要的角色。针对弱势群体出行不便这个社会中不可忽视的问题,本文设计并开发了基于Android平台的弱势群体监护帮助系统。该系统能够支持利用北斗、GPS导航定位的各种终端,同时,结合点对点的短信通信方式,实现了安全监控和护理、点位信息共享和轨迹记录等功能,以解决老人、小孩等弱势群体出行过程中的不便甚至安全隐患问题,具有广泛的实际应用价值。

Micro-Newton scale variable thrust control technique and its noise problem for drag-free satellite platforms:a review

High-precision detection in fundamental space physics,such as space gravitational wave detection,high-precision earth gravity field measurement,and reference frame drag effect measurement,is the key to achieving important breakthroughs in the scientific study of fundamental space physics.Acquiring high-precision measurements requires high-performance satellite platforms to achieve“drag-free control”in a near“pure gravity”flight environment.The critical technology for drag-free control is variable thrust control at the micro-Newton scale.Thrust noise is the most important technical indicator for achieving drag-free flight.However,there is no literature about the current status and future prospects of variable thrust control based on thrust noise.Therefore,the micro-Newton variable thrust control technology and the thrust noise of the drag-free satellite platform are reviewed in this work.Firstly,the research status of micro-Newton scale variable thrust control technology and its applications to drag-free satellite platforms are introduced.Then,the noise problem is analyzed in detail and its solution is theoretically investigated in three aspects:“cross-basin flow problem,”“control problem,”and“system instability and multiple-coupled problem.”Finally,a systematic overview is presented and the corresponding suggested directions of research are discussed.This work provides detailed understanding and support for realizing low-noise variable thrust control in the next generation of drag-free satellites.

VSAT卫星气象水文数据通信装备VR训练平台设计与应用

虚拟现实技术近年来在图形图像处理领域得到广泛应用,针对当前军事装备教学中存在的问题,以VSAT卫星气象水文数据通信装备为例,就如何建设VR训练平台从设计思路、结构、功能与应用以及后台管理等方面进行了说明,并就实际应用情况和效果进行了总结。

A Case Study on Korea Telecom Skylife＇s （KTS＇s） Business Model Innovation Based on the Business Model Framework （BMF）

The aim of this paper is to assess business performances of a satellite TV--Korea Telecom Skylife （KTS）---to innovate its business model related to current technical events such as hybrid platform, digital conversion, and Intemet connected TV. For this, a theoretical logic is approached what levels of business model innovations there are, based on the ＂business model framework （BMF）＂ theory by Henry Chesbrough. Based on this theoretical backdrop, this study focuses on KTS＇s approach to utilize technical events to develop its business model and contribute to the company＇s earnings and operating cost expenditure. In conclusion, it will show the feasibility and the limitation to upgrade this firm＇s business model innovation in the smart media business ecosystem based on the last technical event, Internet connected TV.

基于粗糙集理论和Delphi法的卫星平台指标优化研究

当前军事装备快速发展迭代,对促进装备改型升级具有十分重要的意义。卫星不同于一般装备,存在样品少、价值高、入轨难修复等特点,开展卫星平台研究资料少、难度大,研究价值高。针对当前平台指标体系不完善的情况,对某型卫星平台指标体系进行优化研究。利用粗糙集理论对卫星平台指标进行独立性和信息载荷量进行优化;利用Delphi方法对指标是否被用户部队认可、是否具备实用性进行优化,通过两次递进优化使该平台指标体系更具参考价值。

BDS新时空服务体系赋能数字经济

为了进一步将北斗卫星导航系统(BDS)等科学技术与产业经济、社会民生、安全保障等贯通论述,提出BDS新时空服务体系赋能数字经济的思想:给出目前数字经济大潮中涉及的几个重要概念及其相互关系,以及体系化组合的战略思路;并从数字经济需要战略科技力量支撑,指出智能信息产业需要少而精的关键技术与体系化策划;再由数字化网络化智能化发展依托的五大要素优化配置,牵引出平台化运作概念;接下来由BDS新时空与虚拟元宇宙和数字孪生,提出融合化创新路线图;然后由抓关键与总体观,突出智库作用和体系化推进策略;最后从突破卫星导航脆弱性难题入手,总结实现可信时空服务的最佳化选择。

从单星观测到体系协同:风云卫星智慧协同观测体系的技术特征与发展展望

风云卫星是我国民用遥感卫星中应用范围最广泛、成效最为显著的卫星系列之一,在推动国民经济发展和加强装备自主建设等方面发挥了重要作用。面向气象高质量发展、防灾减灾、应对气候变化、生态文明建设和国家安全等多重挑战,风云卫星将坚持创新驱动发展战略,以体系化、智能化为主要发展方向,突破平台和载荷关键技术,构建智慧协同观测体系。本文探讨了风云卫星智慧协同观测体系在气象综合观测效能提升、体系化智能化网络赋能及全方位环境保障等方面的必要性,在分析国内外气象卫星发展历程的基础上,提出了新一代风云气象卫星构建智慧协同观测体系的建设思路和初步方案,并对体系构建中的关键技术进行了分析。最后,展望了风云卫星智慧协同观测体系的应用前景。

低成本小批量微纳卫星控制系统的研制实践

针对微纳卫星的研制特点,结合控制系统研制过程中的具体实践,从单机产品设计、系统方案设计、测试和环境试验,以及软件开发方面,给出了微纳卫星降低成本、提高可靠性与研制效率的措施和建议.通过采用控制系统内部的冗余备份设计,以及系统级可靠性措施,简化了系统配置,并提高了系统可靠性.通过进行系统级的热循环试验可降低研制成本,并达到可靠性试验筛选的目的.通过开展平台化和通用化设计,完善和改进软件开发流程,提高了研制效率.所述方法和措施在卫星研制中取得了较好的效果.

面向市场的高轨中大型全电推卫星平台研究

近年来,国外高轨通信卫星主要制造商基于电推进、热控和供配电等平台技术的快速发展陆续完成了新一代全电推高轨卫星平台的设计定型工作.我国高轨卫星平台发展可以借鉴这些新一代平台的设计研发理念、降本增效措施和新技术应用等.结合Spacebus-NEO、Eurostar-NEO、Space Inspire和OneSat等国外新一代各类型高轨通信卫星公用平台技术和特点,分析了新一代高轨通信卫星公用平台的市场趋势、发展和设计思路,同时分析了平台相关电推力器、电源处理单元、矢量调节机构及热控等平台设计研究重点方面的需求和技术方向,提出了我国下一代高轨通信卫星公用平台的发展建议,可以作为发展我国未来高轨卫星平台的参考.

TDI CCD相机的卫星姿态稳定度确定

为解决卫星平台振动造成的图像质量下降问题，提高TDI CCD相机成像质量，分析了卫星姿态稳定度的范围及影响。讨论了卫星平台振动与TDI CCD成像质量的相关性，推导了卫星平台姿态稳定度和像移的关系公式，得出TDI CCD相机对卫星姿态稳定度的要求与轨道高度以及积分级数有关。实验验证了公式推导，结果显示：轨道高度越高，积分级数越大，对卫星姿态稳定度的要求就越严格。数据表明：轨道高度在200～1000 km变化时，对卫星姿态稳定度的要求从0.0377 rad/s提升至0.00635 rad/s；TDI CCD 相机的积分级数在1～100间变化时，对卫星姿态稳定度的要求从0.014 rad/s提升到0.00014 rad/s。本文工作确定了卫星姿态稳定度和轨道高度以及积分级数的关系，有助于TDI CCD成像质量的提升。

基于FMI的卫星数字仿真平台设计及实现

针对卫星仿真技术的标准化和通用化发展需求,基于FMI(functional mock-up interface)的接口标准和模型复用技术,构建一个能够支持卫星数字仿真的工具体系架构,在此基础上,运用模块化思想设计了卫星数字仿真平台,并给出Simulink及C/C++模型的FMI标准封装方法.利用卫星数字仿真平台,搭建了多星运行仿真场景,通过远程过程调用技术,将仿真过程数据推送到可视化平台中,完成对卫星运行场景的可视化展示.仿真案例说明,卫星仿真平台可以对模型运行状态及变化趋势进行监控,同时,场景可视化平台可以对卫星的运行轨道及姿态等数据实时动态显示.

基于MBSE的卫星互联网仿真平台架构建模

针对传统基于文档的系统工程方法在高复杂度卫星互联网仿真平台开发中存在的系统设计协调性差及早期仿真验证不足等问题,提出采用基于模型的系统工程(model-based systems engineering,MBSE)方法开展卫星互联网仿真平台架构建模。首先,提出基于MBSE的双V模型(dual V model based on MBSE,DVMBSE)及与外部软件集成验证架构;然后,基于MBSE方法论对卫星互联网仿真平台顶层架构开展需求分析、功能分解及交互结构建模;最后,通过运行逻辑验证与外部模型集成验证实现了模型的有效性验证,从而支撑卫星互联网设计论证。