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Rain Attenuation Impact on Performance of Satellite Ground Stations for Low Earth Orbiting (LEO) Satellites in Europe
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作者 Shkelzen CAKAJ 《International Journal of Communications, Network and System Sciences》 2009年第6期480-485,共6页
Low Earth Orbits (LEO) satellites are used for public communication and for scientific purposes. These satellites provide opportunities for investigations for which alternative techniques are either difficult or impos... Low Earth Orbits (LEO) satellites are used for public communication and for scientific purposes. These satellites provide opportunities for investigations for which alternative techniques are either difficult or impossible to apply. Ground stations have to be established in order to communicate with such satellites. Usually these satellites communicate with ground stations at S-band. The communication quality depends on the performance of the satellite ground station, in addition to that of satellite. The performance of the satellite ground stations is expressed through Figure of Merit. The aim of this paper is to analyze the rain attenuation impact on the performance of the respective ground station. Rain attenuation depends on geographical location where the satellite ground station is implemented. In order to compare this effect on satellite ground station performance, some cities of Europe are considered. Finally, the rain attenuation impact on the satellite ground station Figure of Merit for the hypothetical satellite ground station installed in Prishtina is analyzed. 展开更多
关键词 LEO satellite Ground station RAIN AttENUATION PERFORMANcE
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基于铁路带状北斗CORS的网络RTK测量精度分析 被引量:4
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作者 王建红 《铁道标准设计》 北大核心 2024年第2期74-79,共6页
为研究和拓展北斗导航系统在铁路工程测量中的应用,利用BDS系统技术优势解决山区铁路测量定位难题。基于某山区铁路建立带状北斗连续运行参考站系统(以下简称“北斗CORS系统”)和高精度位置服务云平台。采用国产多星多频测量型接收机进... 为研究和拓展北斗导航系统在铁路工程测量中的应用,利用BDS系统技术优势解决山区铁路测量定位难题。基于某山区铁路建立带状北斗连续运行参考站系统(以下简称“北斗CORS系统”)和高精度位置服务云平台。采用国产多星多频测量型接收机进行控制点数据采集工作,分别对比基于北斗CORS系统的单BDS、单GPS以及GNSS混合星历网络RTK观测数据以及传统基站形式的RTK观测数据的测量精度。结果表明:(1)铁路带状北斗高精度位置服务云平台网络RTK定位功能稳定可靠;(2)基于北斗CORS系统的网络RTK测量方法仅需进行高程曲面拟合,按3s采集的成果精度即可满足铁路测量规范中网络RTK中线测量、断面测量、施工放样、像控测量的精度要求,测量时应尽量采用同类型的设备并采用同精度观测方法以保证重复测量精度,也可通过增加观测时长、在局部区域利用既有高程控制点做高程校正的方式提高测量精度;(3)基于北斗CORS系统的网络RTK测量平面和高程内符合精度限差可分别设定为1.7 cm和2 cm,外符合精度可分别设定为2.2 cm和5 cm。 展开更多
关键词 北斗导航系统 连续运行参考站 铁路工程 线路测量 网络RTK 精度分析
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Error Analysis of Orbit Determination for the Geostationary Satellite with Single Station Antenna Tracking Data
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作者 Chingiz Hajiyev Melih Ata 《Positioning》 2011年第4期135-144,共10页
In the study, position and velocity values of a geostationary satellite are found. When performing this, a MATLAB algorithm is used for Runge-Kutta Fehlberg orbit integration method to solve spacecraft’s position and... In the study, position and velocity values of a geostationary satellite are found. When performing this, a MATLAB algorithm is used for Runge-Kutta Fehlberg orbit integration method to solve spacecraft’s position and velocity. Integrated method is the solution for the systems which mainly work with a single station. Method provides calculation of azimuth, elevation and range data by using the position simulation results found by RKF. Errors of orbit determination are analysed. Variances of orbit parameters are chosen as the accuracy criteria. Analysis results are the indicator of the method’s 展开更多
关键词 ORBIT Determination Geostationary satellite Single station ANTENNA ERROR Analysis
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昆明CORS整合及升级设计与建设
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作者 王友昆 丁仁军 +2 位作者 寸寿才 董国桥 张君华 《工程勘察》 2024年第5期44-48,65,共6页
本文主要介绍了昆明市卫星定位综合服务系统(KMCORS)整合和升级建设的背景、设计思路、建设内容和建设成效。项目对已有的两套CORS系统进行整合和升级,建设覆盖昆明全市域的基准站网,融合多个品牌接收机观测数据,实现多部门基准站观测... 本文主要介绍了昆明市卫星定位综合服务系统(KMCORS)整合和升级建设的背景、设计思路、建设内容和建设成效。项目对已有的两套CORS系统进行整合和升级,建设覆盖昆明全市域的基准站网,融合多个品牌接收机观测数据,实现多部门基准站观测数据的共享。KMCORS整合及升级后,全面支持北斗卫星导航系统,覆盖范围更广、精度更高,面向社会公众可实现线上一站式的管理和服务。同时,构建第一个城市连续运行参考站系统(CORS)监测运行体系,实现对CORS运行状态的全天候监测。项目的建设方法和过程,可为其他城市CORS升级改造提供参考。 展开更多
关键词 连续运行参考站系统 全球卫星导航系统 整合 升级 卫星定位
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Preliminary Design for Station-Keeping of a Communication Satellite
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作者 LENIN A Luna Díaz 《Computer Aided Drafting,Design and Manufacturing》 2010年第2期68-77,共10页
This paper has analyzed the perturbations of a GeoX-Sat (virtual satellite) in geostationary orbit (GEO). And control methods, strategies and calculation processes are designed of the East-West (E/W) station-kee... This paper has analyzed the perturbations of a GeoX-Sat (virtual satellite) in geostationary orbit (GEO). And control methods, strategies and calculation processes are designed of the East-West (E/W) station-keeping of the GeoX-Sat. The Attitude and Orbit Control Subsystem (AOCS) provides attitude information and maintains the required spacecraft attitude during all phases of the mission, starting at spacecraft separation from the launch vehicle and throughout its operational lifetime. For the GeoX-Sat exercising design, due to time limitations; only two modes of operation were considered after assumed launching operation: normal and station keeping. 展开更多
关键词 cOMMUNIcATION satellite AOcS East/West station keeping
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Design of Station Keeping Mode for Attitude Orbit Control Subsystem of T-SAT
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作者 SALOMON Montenegro KENDRICK Amezquita 《Computer Aided Drafting,Design and Manufacturing》 2010年第2期78-84,共7页
Station keeping mode (SKM) for Attitude Orbit Control Subsystem (AOCS); it is an operational approach regarding the attitude dynamics control. The essential features of the design methodology is researching the ba... Station keeping mode (SKM) for Attitude Orbit Control Subsystem (AOCS); it is an operational approach regarding the attitude dynamics control. The essential features of the design methodology is researching the basic theory and then afterwards, make an iterative design approach using some premise/assumptions, implementing the system simulation through the Simulink Matlab software package, designing the required controllers, monitor and analyzing the responses until the design give the best results within the range required. Firstly the thruster configuration is designed to acquire the parameters of the torque on the satellite. Next, the controllers are based on the well known PID control law. Controllers optimize the attitude and are used during the maneuvers for SKM. Afterwards the simulation results are given, and presented to demonstrate the performance and validity of the AOCS design approach. Finally the simulation results demonstrate that all the requirements were accomplished and the Station Keeping Mode was successfully designed. 展开更多
关键词 communication satellite AOcS East/West station keeping
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基于整网解和分区解的铁路沿线基准站CGCS2000坐标确定
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作者 杨美皓 白雪娇 +2 位作者 梁莹 郭靖 张卓娅 《北京测绘》 2024年第3期421-426,共6页
基于现有高铁线路控制测量或监测需求,在沿线布设卫星导航定位连续运行基准站(CORS)作为控制基准。对于较长的线路监测,对沿线基准站坐标采用整网解与分区解进行差异比较,并设计了多种比较方式。研究结果表明,对于计算铁路沿线基准站的... 基于现有高铁线路控制测量或监测需求,在沿线布设卫星导航定位连续运行基准站(CORS)作为控制基准。对于较长的线路监测,对沿线基准站坐标采用整网解与分区解进行差异比较,并设计了多种比较方式。研究结果表明,对于计算铁路沿线基准站的国际地球参考框架(ITRF)2020坐标,整网处理与分区处理的差异较小;对于CORS站的2000国家大地坐标系(CGCS2000)的坐标计算,两者差异大部分在框架转换精度范围内,但仍有12%的点差异较大,超过了CGCS2000框架转换的2倍误差。在实际计算过程中,需要考虑整网处理与分区处理的差异。 展开更多
关键词 国际地球参考框架 2000国家大地坐标系 卫星导航定位基准站
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Hierarchical Disturbance Propagation Mechanism and Improved Contract Net Protocol for Satellite TT&C Resource Dynamic Scheduling
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作者 Zhiqing Xiang Yi Gu +1 位作者 Xinwei Wang Guohua Wu 《Complex System Modeling and Simulation》 EI 2024年第2期166-183,共18页
The practical engineering of satellite tracking telemetry and command(TT&C)is often disturbed by unpredictable external factors,including the temporary rise in a significant quantity of satellite TT&C tasks,te... The practical engineering of satellite tracking telemetry and command(TT&C)is often disturbed by unpredictable external factors,including the temporary rise in a significant quantity of satellite TT&C tasks,temporary failures and failures of some TT&C resources,and so on.To improve the adaptability and robustness of satellite TT&C systems when faced with uncertain dynamic disturbances,a hierarchical disturbance propagation mechanism and an improved contract network dynamic scheduling method for satellite TT&C resources were designed to address the dynamic scheduling problem of satellite TT&C resources.Firstly,the characteristics of the dynamic scheduling problem of satellite TT&C resources are analyzed,and a mathematical model is established with the weighted optimization objectives of maximizing the revenue from task completion and minimizing the degree of plan disturbance.Then,a bottom-up distributed dynamic collaborative scheduling framework for satellite TT&C resources is proposed,which includes a task layer,a resource layer,a central internal collaboration layer,and a central external collaboration layer.Dynamic disturbances are propagated layer by layer from the task layer to the central external collaboration layer in a bottom-up manner,using efficient heuristic strategies in the task layer and the resource layer,respectively.We use improved contract network algorithms in the center internal collaboration layer and the center external collaboration layer,the original scheduling plan is quickly adjusted to minimize the impact of disturbances while effectively completing dynamic task requirements.Finally,a large number of simulation experiments were carried out and compared with various comparative algorithms.The results show that the proposed algorithm can effectively improve the solution effect of satellite TT&C resource dynamic scheduling problems,and has good application prospects. 展开更多
关键词 satellite tracking telemetry and command(tt&c) dynamic resource scheduling bottom-up mechanism heuristic strategy contract net protocol algorithm
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A Method for Rapidly Determining the Optimal Distribution Locations of GNSS Stations for Orbit and ERP Measurement Based on Map Grid Zooming and Genetic Algorithm 被引量:3
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作者 Qianxin Wang Chao Hu Ya Mao 《Computer Modeling in Engineering & Sciences》 SCIE EI 2018年第12期509-525,共17页
Designing the optimal distribution of Global Navigation Satellite System(GNSS)ground stations is crucial for determining the satellite orbit,satellite clock and Earth Rotation Parameters(ERP)at a desired precision usi... Designing the optimal distribution of Global Navigation Satellite System(GNSS)ground stations is crucial for determining the satellite orbit,satellite clock and Earth Rotation Parameters(ERP)at a desired precision using a limited number of stations.In this work,a new criterion for the optimal GNSS station distribution for orbit and ERP determination is proposed,named the minimum Orbit and ERP Dilution of Precision Factor(OEDOP)criterion.To quickly identify the specific station locations for the optimal station distribution on a map,a method for the rapid determination of the selected station locations is developed,which is based on the map grid zooming and heuristic technique.Using the minimum OEDOP criterion and the proposed method for the rapid determination of optimal station locations,an optimal or near-optimal station distribution scheme for 17 newly built BeiDou Navigation Satellite System(BDS)global tracking stations is suggested.To verify the proposed criterion and method,real GNSS data are processed.The results show that the minimum OEDOP criterion is valid,as the smaller the value of OEDOP,the better the precision of the satellite orbit and ERP determination.Relative to the exhaustive method,the proposed method significantly improves the computational efficiency of the optimal station location determination.In the case of 3 newly built stations,the computational efficiency of the proposed method is 35 times greater than that of the exhaustive method.As the number of stations increases,the improvement in the computational efficiency becomes increasingly obvious. 展开更多
关键词 Global Navigation satellite System(GNSS) optimal distribution of station network MAP GRID ZOOMING genetic algorithm.
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Novel satellite transport protocol with on-board spoofing proxy
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作者 Liu Jiong Cao Zhigang Wang Jinglin 《Journal of Systems Engineering and Electronics》 SCIE EI CSCD 2006年第3期513-520,共8页
As a result of the exponential growing rate of worldwide Internet usage, satellite systems are required to support broadband Internet applications. The transmission control protocol (TCP) which is widely used in the... As a result of the exponential growing rate of worldwide Internet usage, satellite systems are required to support broadband Internet applications. The transmission control protocol (TCP) which is widely used in the Internet, performs very well on wired networks. However, in the case of satellite channels, clue to the delay and transmission errors, TCP performance degrades significantly and bandwidth of satellite links can not be fully utilized. To improve the TCP performance, a new idea of placing a TCP spoofing proxy in the satellite is considered. A Novel Satellite Transport Protocol (NSTP) which takes advantage of the special properties of the satellite channel is also proposed. By using simulation, as compared with traditional TCPs, the on-board spoofing proxy integrated with the special transport protocol can significantly enhance throughput performance on the high BER satellite link, the time needed to transfer files and the bandwidth used in reverse path are sharply reduced. 展开更多
关键词 satellite communication on-board spoofing proxy novel satellite transport protocol (NSTP) modified SAcK (M-SAcK) TcP ground station (GS).
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Satellite Communication System Using SSMA Techniques
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作者 Hu Yi and Xu Jinglong(Beijing Institute of Remote Sensing Equipment) 《Journal of Systems Engineering and Electronics》 SCIE EI CSCD 1990年第1期71-76,共6页
A satellite communication system consisting of small earth terminals which utilize spread spectrum multiple access (SSMA) techniques is introduced in this paper. Having no master station, the system is distributively ... A satellite communication system consisting of small earth terminals which utilize spread spectrum multiple access (SSMA) techniques is introduced in this paper. Having no master station, the system is distributively controlled. The frequency band used is 6/4GHz. 展开更多
关键词 satellite communication Spread spectrum Earth station communication network.
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HNCORS推进北斗应用升级改造方案研究 被引量:2
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作者 龙靖雯 黎晨曦 《国土资源导刊》 2023年第2期31-36,共6页
针对湖南省北斗卫星导航定位基准站网(HNCORS)存在的无法兼容北斗三号、基础设施不够完善、数据共享融合不充分的问题,提出推进北斗应用升级改造的对策:(1)对现有HNCORS基准站和数据中心的软硬件基础设施进行升级改造,满足北斗三号卫星... 针对湖南省北斗卫星导航定位基准站网(HNCORS)存在的无法兼容北斗三号、基础设施不够完善、数据共享融合不充分的问题,提出推进北斗应用升级改造的对策:(1)对现有HNCORS基准站和数据中心的软硬件基础设施进行升级改造,满足北斗三号卫星数据的接收和处理需求;(2)开发用户管理系统和运维系统,提升高精度位置服务能力,实现卫星导航定位服务全兼容、全覆盖、全应用(;3)制定湖南省卫星导航定位基准站空间布局规划,成立北斗服务联盟,推动卫星导航基准站共建、共享,规范基准站建设、运维和服务,推动全省卫星导航定位产业发展,为湖南省实施“三高四新”战略提供支撑。 展开更多
关键词 HNcORS 北斗三号卫星 卫星导航定位基准站 GPS
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Chinese Surveying and Control Network for Earth-Orbit Satellites and Deep Space Detection
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作者 WEI Erhu LIU Jingnan SHI Chuang 《Geo-Spatial Information Science》 2006年第1期6-12,37,共8页
The relationship between the surveying and contro l network(CSN) for earth-orbit satellite and spatial geodesy, and the relationshi p between the CSN for deep space celestial bodies and detectors, and deep space detec... The relationship between the surveying and contro l network(CSN) for earth-orbit satellite and spatial geodesy, and the relationshi p between the CSN for deep space celestial bodies and detectors, and deep space detection are briefly summarized, and so are the basic technical needs of the de ep space surveying and control network(DSN). Then, the techniques, the constitue nts and the distributing of Chinese satellite CSN (CSCSN) and other radio observ ing establishments in China are introduced. Lastly, with the primary CSCSN and o ther observing establishments, some projects for China to rebuild a more perfect CSCSN, and to establish a DSN are analyzed and stated. 展开更多
关键词 satellite surveying and control network DSN microwave radio radar LLR DSccs radio observation space-based station
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Land vertical movement analysis of China coastal tidal stations and adjacent areas
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作者 JIN Bowen WANG Hui +3 位作者 LI Jingwei LI Wenshan LI Huan XU Hao 《Marine Science Bulletin》 2022年第1期19-33,共15页
The paper analyzes the characteristics of the vertical movement of the land in the coastal areas of China and its neighboring areas by using the GNSS observation data of the tide gauge at coastal stations of China and... The paper analyzes the characteristics of the vertical movement of the land in the coastal areas of China and its neighboring areas by using the GNSS observation data of the tide gauge at coastal stations of China and the land-based network GNSS reference stations in the neighboring areas,combined with the satellite altimeter and the sea-level observation data of the stations.The results show that the vertical movement of the land in China's coastal provinces and municipalities and coastal tide gauge stations is generally ascending from Liaoning to Jiangsu Province and subsiding from Shanghai to Quanzhou,Xiamen to Guangxi Autonomous Region coastal alternate pattern of elevation,local coastal plain areas such as southern Tianjin in the North China Plain,and Cang County in the Hebei Plain show significant subsidence characteristics.The uplift and subsidence of land at tide gauge stations is an important part of the relative sea level changes along the coast.The accurate characteristics of the vertical movement of land at tide gauge stations and its adjacent areas provides basis for analysis of relative sea level changes along the coast,assessment of sea level change impact and future sea level rise forecast. 展开更多
关键词 tide station GNSS satellite altimeter vertical movement
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A Hybrid Algorithm for Satellite Data Transmission Schedule Based on Genetic Algorithm
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作者 李云峰 武小悦 《Defence Technology(防务技术)》 SCIE EI CAS 2008年第3期203-208,共6页
A hybrid scheduling algorithm based on genetic algorithm is proposed in this paper for reconnaissance satellite data transmission.At first,based on description of satellite data transmission request,satellite data tra... A hybrid scheduling algorithm based on genetic algorithm is proposed in this paper for reconnaissance satellite data transmission.At first,based on description of satellite data transmission request,satellite data transmission task model and satellite data transmission scheduling problem model are established.Secondly,the conflicts in scheduling are discussed.According to the meaning of possible conflict,the method to divide possible conflict task set is given.Thirdly,a hybrid algorithm which consists of genetic algorithm and heuristic information is presented.The heuristic information comes from two concepts,conflict degree and conflict number.Finally,an example shows the algorithm's feasibility and performance better than other traditional 展开更多
关键词 航天系统 人工智能理论 勘测技术 遗传算法
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Electric Thrusters Redundancy Configuration Strategy Study for All Electric Propulsion Platform Station-Keeping
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作者 Min Wang Qiang Li Xin’gang Liang 《Journal of Harbin Institute of Technology(New Series)》 EI CAS 2018年第3期55-61,共7页
Electric propulsion is used for all electric propulsion satellites to perform the orbit transfer,attitude control and station-keeping tasks. Generally electric propulsion subsystem contains 4 thrusters. But if one thr... Electric propulsion is used for all electric propulsion satellites to perform the orbit transfer,attitude control and station-keeping tasks. Generally electric propulsion subsystem contains 4 thrusters. But if one thruster fails in the beginning of satellite lifetime,other thrusters will undertake all the firing tasks. The firing time will be 2 to 3 times of thrusters without failure. Thus it may go beyond the allow ed lifetime of thruster. This paper puts forward two thruster redundancy configuration solutions with 6 thrusters to solve this problem. Two layout configurations and their corresponding station-keeping strategies are simulated and compared. The results show that the maximum firing time of both layout configurations can meet the lifetime limitation. This solution is a good reference for all electric propulsion satellites design. 展开更多
关键词 all electric propulsion satellite station-keeping electric thrusters configuration electric thruster layout FAILURE REDUNDANcY
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5G基站对C波段广播电视卫星接收站干扰的分析与处理 被引量:3
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作者 皇甫江 王玉婷 +1 位作者 司东建 李亚琼 《中国有线电视》 2023年第6期27-29,共3页
分析5G基站干扰广播电视卫星接收站的具体路径,以及接收站如何才能抵御5G信号干扰的影响,是广播电视行业面临的新挑战。在理论层面分析5G基站对卫星广播电视地面站产生干扰的具体路径,进一步对C波段卫星通信站进行实际测试,提出并验证... 分析5G基站干扰广播电视卫星接收站的具体路径,以及接收站如何才能抵御5G信号干扰的影响,是广播电视行业面临的新挑战。在理论层面分析5G基站对卫星广播电视地面站产生干扰的具体路径,进一步对C波段卫星通信站进行实际测试,提出并验证安装滤波器是降低5G信号干扰的有效措施。 展开更多
关键词 5G基站 c波段 干扰 卫星接收站
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GDCORS和粤港澳大湾区似大地水准面在验潮站水准点高程测定中的应用
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作者 施紫鹏 胡鹏 +1 位作者 朱亚兵 刘文建 《北京测绘》 2023年第5期712-718,共7页
基于广东省陆海一体现代测绘基准体系建设成果,以江门市沿海的5个验潮站水准点作为试验点,同时在试验点周边选取4个高程控制点作为检核点,分别从高程和高差两个方面进行全球导航卫星系统(GNSS)静态高程测量替代国家三等、四等水准测量... 基于广东省陆海一体现代测绘基准体系建设成果,以江门市沿海的5个验潮站水准点作为试验点,同时在试验点周边选取4个高程控制点作为检核点,分别从高程和高差两个方面进行全球导航卫星系统(GNSS)静态高程测量替代国家三等、四等水准测量的误差对比分析,探究GNSS静态高程测量在不同观测时长下的精度情况。试验结果表明,在结合广东省连续运行卫星定位服务系统(GDCORS)和粤港澳大湾区高精度似大地水准面模型的情况下,对沿海地区验潮站水准点进行2和4 h以上的GNSS静态高程测量分别可以达到国家四等和三等水准测量的精度要求,此试验为其在广东省海洋测绘领域应用提供了价值参考。 展开更多
关键词 似大地水准面精化模型 广东省连续运行卫星定位服务系统(GDcORS) 全球导航卫星系统(GNSS) 水准测量
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手机直连卫星关键技术分析与发展展望 被引量:2
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作者 宋艳军 肖永伟 孙晨华 《电信科学》 北大核心 2024年第4期1-9,共9页
手机直连卫星技术的快速发展是卫星载荷技术突破、手机终端技术创新、体制标准制定并验证等多种因素叠加的结果,通过对手机直连卫星发展现状的介绍,总结了手机直连卫星的2条技术路线和3种实现方式。面对星地频率共用、星载天线、星载基... 手机直连卫星技术的快速发展是卫星载荷技术突破、手机终端技术创新、体制标准制定并验证等多种因素叠加的结果,通过对手机直连卫星发展现状的介绍,总结了手机直连卫星的2条技术路线和3种实现方式。面对星地频率共用、星载天线、星载基站等技术瓶颈,结合实际系统和应用场景给出了重点研究内容。探讨了作为5G通信重要组成部分和6G通信基础支撑的手机直连卫星技术未来的发展方向。 展开更多
关键词 手机直连卫星 非地面网络 频率共用 星载天线 星载基站
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C波段中波广播转播台抗5G基站干扰分析及实践
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作者 刘丽 《中国科技纵横》 2023年第14期64-67,共4页
随着科技的进步,5G通信技术也渐渐开展,随着5G技术的成熟,全国范围内也开始5G技术的推广活动,5G技术在商用方面也已经开始了规划和部署,以期能够在未来的几年内实现5G技术的全方面覆盖。基于此,本文主要阐述中波广播转播台卫星接收系统... 随着科技的进步,5G通信技术也渐渐开展,随着5G技术的成熟,全国范围内也开始5G技术的推广活动,5G技术在商用方面也已经开始了规划和部署,以期能够在未来的几年内实现5G技术的全方面覆盖。基于此,本文主要阐述中波广播转播台卫星接收系统的工作原理,并提出中波广播转播台卫星避免5G基站干扰、去除5G信号影响的策略。 展开更多
关键词 中波广播转播台 5G频率测试 c波段卫星信息接收
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