scholarly journals Polarization Tracking Study of Earth Station in Satellite Communications

2015 ◽  
Vol 5 (1) ◽  
pp. 10
Author(s):  
Lihua Ma ◽  
Chao Hu ◽  
Jun Pei
Keyword(s):  
Satellite Communication ◽  
Satellite Communications ◽  
Vital Role ◽  
Polarization Angle ◽  
Tracking Accuracy ◽  
Earth Station ◽  
The Earth ◽  
Observation Series ◽  
Typical Satellite ◽  
Antenna Polarization

Satellite communications, in telecommunications, the use of satellite can provide communications links between various points on the earth. Typical satellite communication is composed of a communication satellite, a signal transmitter and a signal receiver. As the signal transmitter or the signal receiver, an earth station plays a vital role in the satellite communications. Accurately adjustment of antenna azimuth, elevation and polarization angles on the earth station is the key to satellite communications. In the present paper, a study of polarization tracking of earth station is presented, and a detailed adjustment procession of the polarization angle is given. Combing with observation series of MEASAT-2 satellite in geostationary orbit, the polarization tracking accuracy is verified. The method can be embeded into computer program of antenna polarization adjustment in earth station.

scholarly journals EVALUATION OF INFLUENCE OF UNINTENTIONAL NON-STATIONARY INTERFERENCE ON FUNCTIONING OF SATELLITE COMMUNICATION SYSTEM WITH MULTIFREQUENCY TIME-DIVISION MULTIPLE ACCESS

2020 ◽  
pp. 28-33
Author(s):  
A. V. Parshutkin ◽  
S. A. Svyatkin ◽  
D. I. Buchinsky
Keyword(s):  
Communication System ◽  
Multiple Access ◽  
Satellite Communication ◽  
Satellite Communications ◽  
Time Division Multiple Access ◽  
Satellite Communication System ◽  
Earth Station ◽  
The Earth ◽  
Time Division ◽  
Communications System

The article considers the effect of non-Stationary unintentional interference on the earth station of a satellite communications system with Multi-Frequency Time-Division Multiple Access. The influence of non-stationary interference and white Gaussian noise on the earth station reception channel is compared using simulation modeling. The simulation model takes into account the effect of unintentional interference on the synchronization subsystem and the allocation of the boundaries of the transmitted packet of the receiver of the earth station of the satellite communication system. The probability of a bit error was used as a criterion for the quality of the satellite channel operation. The article shows the dependence of the protective ratio on the ratio of the preamble length to the packet length under the influence of pulsed interference. The obtained dependence can be used to assess the noise immunity of an earth station in a satellite communications system under the influence of pulsed interference.

Analysis of methods for pointing earth station antennassatellite communications

2020 ◽  
Vol 4 ◽  
pp. 22-31
Author(s):  
Alexey Musaev ◽  
◽  
Sergey Zinkin
Keyword(s):  
Spatial Orientation ◽  
Satellite Communication ◽  
Artificial Satellite ◽  
Experimental Studies ◽  
Directional Pattern ◽  
Earth Station ◽  
The Earth

The antenna guidance of earth stations of satellite communication consists in such its spatial orientation in azimuth and angle of location, at which the antenna›s directional pattern would coincide with the direction to the repeater located on an artificial satellite of the Earth. The article analyzes the methods, as well as their features, of pointing the antennas of terrestrial satellite communication stations. Suggestions are made for future experimental studies.

scholarly journals Research and Development of Mobile Marine Satellite Antenna System in Vietnam

2019 ◽  
Vol 35 (2) ◽  
Author(s):  
Ho Anh Tam ◽  
Do Thi Huong Giang
Keyword(s):  
Satellite Communication ◽  
Weather Conditions ◽  
Satellite Communications ◽  
Antenna System ◽  
Polarization Angle ◽  
Phased Array Antenna ◽  
Satellite Antenna ◽  
Mobile Broadband ◽  
Access System ◽  
Communication Signal

Abstract: A second version of the mobile marine satellite communication signal receiver station has been designed, manufactured, assembled and tested using domestically engineered mechanical modules, commercial and low-cost integrated sensors, motors and drivers. The operating mechanical components have been developed in the form of independently operating modules with handling ease and high sensitivity at a “clearance” in the order of 10µm. The sensors are of high and firm integration and good noise compensation facilities. The appropriately developed automatic control algorithms and software allow efficient and safe searching and following the broadcasting satellite of the antenna device installed on a marine transport boat. Compared to the previous version, this new development has more optimal dimensions, is easier and more flexible to start up and operate with operating parameters of pitch: 15-80° (±0.5°), yaw: of 0-360° (±0.25°), and polarization angle of 0-360° (±0.5°). The antenna turn rates are of ~12°/s and 12°/s2. All the components of the complete system are water- and weather proof and packaged to ensure safe operation in marine conditions. Running tests have been successfully taken in real sunny weather conditions on a sea boat speeding at 30 km/h with a wind velocity up to 19 km/h. The article concludes that domestically engineered, the device is more financially efficient than imported counterpart equipments as well as promising in terms of technology transfer to mass production by domestic businesses. Keywords: Satellite receiver antenna, marine satellite antenna, antenna angle controller, sensors. References [1] B. Schneiderman, Executive Roundtable on Maritime and Energy Markets, Satellite Executive Briefing, Vol. 11 No. 8 (2018) 9.[2] L.M. Bradbury, D. Diaconu, S. Molgat Laurin, A.M. Beattie, C. Ma, I.S. Spydevold, H.C. Haugli, R.E. Zee, J. Harr, F. Udnæs, NorSat-2: Enabling advanced maritime communication with VDES, Acta Astronautica, 156 (2019) 44-50[3] Y.J. Song, P.S. Kim, D.G. Oh, et al., Development of mobile broadband interactive satellite access system for Ku/Ka band, International journal of satellite communications and networking, 24 (2007) 101-117. [4] Y.J. Song, M.S. Shin, B.H. Kim, et al, Development of mobile broadband satellite access system for Ka/Ku-band satellite communications, Ieice transactions on communications, e87b (2004) 2152-2161.[5] S. Pekowsky, G Pousset, Y. Levy, MobileTV Receiver Technology with special emphasis on DVB-SH, international journal of satellite communications and networking, 27 (2009) 275-293.[6] http://www.raysat.com/mobile_satellite_television_antennas.[7] Nguyễn Hữu Đức, Bùi Đình Tú, Nguyễn Thị Ngọc, Đồng Quốc Việt, Đỗ Thị Hương Giang, Trạm thu di động thông tin vệ tinh dựa trên sensơ từ trường độ nhạy cao ứng dụng trên tàu biển, Tuyển tập Hội thảo khoa học Công nghệ vũ trụ và ứng dụng, Hà Nội, 2014.[8] M. Geissler, F. Woetzel, M.Böttcher, S. Korthoff, A.Lauer, M.Eube, R. Gieron, Roman, Innovative phased array antenna for maritime satellite communications, EuCAP 2009. 3rd European Conference on Antennas and Propagation, (2009)735-739[9] http://www.orbit-cs.com/modular-maritime-communications-system[10] https://www.digisat.org/maritime-satcom-vsat[11] https://paracomm.co.uk/[12] https://www.intelliantech.com/?lang=en.[13] Nguyễn Hữu Đức, Báo cáo tổng kết đề tài đề tài “Thiết kế và chế tạo trạm thu di động thông tin vệ tinh dựa trên sensơ từ trường độ nhạy cao ứng dụng trên tàu biển”, Chương trình KH&CN quốc gia về Công nghệ vũ trụ giai đoạn 2013-2015, Hà Nội, 2016.  

Earth Station Tracking SIGSO Satellite: Analysis and Discussion

2012 ◽  
Vol 229-231 ◽  
pp. 1347-1351
Author(s):  
Zheng Qun Hu ◽  
Chang Lü ◽  
Jun Pei
Keyword(s):  
Communication System ◽  
Satellite Communication ◽  
Tracking System ◽  
Earth Station ◽  
The Past ◽  
The Earth ◽  
Servo Tracking ◽  
Ground Distance ◽  
Satellite Analysis ◽  
Beacon Signal

Earth station and satellite are important components of the satellite communication system, this paper analyses earth station antenna for the main measurement parameters, which include azimuth, elevation, satellite to the ground distance and AGC of beacon signal; explores the earth station antenna AGC servo tracking system; azimuth, elevation and AGC level value are calculated when the earth station in Peking aligns APstar-1 satellite. Experimental results show that the changing amplitude of azimuth, elevation and APstar-1satlellite drifts rate is increasing in the past years.

INNOVATIVE METHOD OF SATELLITE COMMUNICATION

2019 ◽  
Author(s):  
Teodor Narytnik ◽  
Vladimir Saiko
Keyword(s):  
Communication Systems ◽  
High Speed ◽  
Satellite Communication ◽  
Radio Channel ◽  
Satellite Communications ◽  
Service Area ◽  
Satellite Systems ◽  
Orbit Satellite ◽  
Geometric Size ◽  
Distributed Satellite

The technical aspects of the main promising projects in the segments of medium and low-orbit satellite communication systems are considered, as well as the project of the domestic low-orbit information and telecommunications system using the terahertz range, which is based on the use of satellite platforms of the micro- and nanosatellite class and the distribution of functional blocks of complex satellite payloads more high-end on multiple functionally related satellites. The proposed system of low-orbit satellite communications represents the groupings of low-orbit spacecraft (LEO-system) with the architecture of a "distributed satellite", which include the groupings of the root (leading) satellites and satellite repeaters (slaves). Root satellites are interconnected in a ring network by high-speed links between the satellites. The geometric size of the “distributed satellite” is the area around the root satellite with a radius of about 1 km. The combination of beams, which are formed by the repeater satellites, make up the service area of the LEO system. The requirements for the integrated service area of the LEO system (geographical service area) determine the requirements for the number of distributed satellites in the system as a whole. In the proposed system to reduce mutual interference between the grouping of the root (leading) satellites and repeater satellites (slaves) and, accordingly, minimizing distortions of the information signal when implementing inter-satellite communication, this line (radio channel) was created in an unlicensed frequency (e.g., in the terahertz 140 GHz) range. In addition, it additionally allows you to minimize the size of the antennas of such a broadband channel and simplify the operation of these satellite systems.

Basic communication sciences

1969 ◽  
Vol 308 (1493) ◽  
pp. 183-198
Keyword(s):  
Long Distance ◽  
Earth Station ◽  
Early Communication ◽  
Technical Developments ◽  
Radiated Power ◽  
The Earth ◽  
Distance Communication ◽  
Quality Of Transmission ◽  
Communication Equipment

The feasibility and utility of long-distance communication via Earth-orbiting satellites has been demonstrated during recent years and it is appropriate therefore to focus attention on the more important scientific studies and technical developments that will be needed if full use is to be made of this valuable mode of communication in the future. The early communication satellites (the Telstar and Relay series) were pioneers in a relatively unknown propagation environment. The satellites themselves were conceptually simple and the communication equipment consisted essentially of a frequency-changing transponder with an r. f. power output of a few watts and a bandwidth some tens of megahertz. Carrier frequencies in the range 2 to 6 GHz were employed; typically either 2 or 6 GHz was used for transmission and 4 GHz for reception at the Earth station. To obtain an adequate signal/noise ratio at the output of the Earth station receiver, frequency modulation was employed, the frequency deviations being greater than those used on terrestrial microwave links. Launcher limitations and other factors meant that the satellites had to be placed in inclined elliptical orbits (see figure 1) with maximum heights of only a few thousand miles. Nevertheless, these satellites demonstrated that some hundreds of frequency-division multiplex telephony circuits, or a television channel, could be achieved with generally satisfactory quality of transmission. It is to be noted, however, that the satellite transponders accommodated only one, or at the most two, r. f. carriers at any time, and that the transmission performance was at times marginal due to limitations of the satellite effective radiated power. Furthermore, these relatively low orbit satellites provided communication in periods of generally less than an hour at a time and required continuous tracking by the Earth station aerials, due to movement of the satellites relative to the Earth.

scholarly journals Optimal approach for building scheduling algorithm in satellite communication

2018 ◽  
Vol 7 (2.28) ◽  
pp. 181
Author(s):  
Ali M. Al-Saegh
Keyword(s):  
Quality Of Service ◽  
Communication Networks ◽  
Satellite Communication ◽  
Scheduling Algorithm ◽  
Satellite Communications ◽  
Satellite Networks ◽  
Communication Links ◽  
Optimal Approach ◽  
Proper Solutions

Building scheduling algorithms in satellite communication links became a necessity according to the typical problems that satellite networks suffers from, such as congestions, jamming, mobility, atmospheric impairment, and achieving the quality of service (QoS) requirements. However, building efficient algorithms needs several considerations that should be taken into account. Such as satellite and earth station node(s), link parameters and specifications, along with the service requirements and limitations. This paper presents efficient approach for accumulating the effective considerations that the designer should employ as a framework for building proper and efficient scheduling algorithm. The proposed approach provides proper solutions to the satellite communications impairments and satisfies the quality of service requirements in satellite communication networks.  

scholarly journals Analysis of Time Diversity Gain for Satellite Communication Link based on Ku-Band Rain Attenuation Data Measured in Malaysia

2018 ◽  
Vol 8 (4) ◽  
pp. 2608
Author(s):  
Islam Md. Rafiqul ◽  
Ali Kadhim Lwas ◽  
Mohamed Hadi Habaebi ◽  
Md Moktarul Alam ◽  
Jalel Chebil ◽  
...  
Keyword(s):  
Satellite Communication ◽  
Satellite Communications ◽  
Earth Satellite ◽  
Rain Attenuation ◽  
Diversity Gain ◽  
Communication Link ◽  
Time Diversity ◽  
Communication Links ◽  
System Time ◽  
Diversity Technique

<p><span>This paper reports a study on mitigation of propagation impairments on Earth–space communication links. The study uses time diversity as a technique for mitigating rain propagation impairment in order to rectify rain fade. Rain attenuation time series along earth-to-satellite link were measured for two years period at 12.255 GHz in Malaysia. The time diversity technique was applied on measured rain fade to investigate the level of possible improvement in system. Time diversity gain from measured one-minute rain attenuation for two years period was estimated and significant improvement was observed with different delays of time. These findings will be utilized as a useful tool for link designers to apply time diversity as a rain fade mitigation technique in Earth-satellite communications systems.</span></p>

Global Networking and the Contrapuntal Node: The Project Mercury Earth Station in Zanzibar, 1959-64

2020 ◽  
Vol 11 (2020) ◽  
Author(s):  
Lisa Parks
Keyword(s):  
Satellite Mission ◽  
Earth Station ◽  
The Earth ◽  
The Us ◽  
Us Government

In 1960, the US government and British protectorate of Zanzibar signed an agreement that allowed US contractors working for the National Aeronautics and Space Administration (NASA) to build an earth station that would support Project Mercury, the first manned US satellite mission. This article focuses on the development of the Project Mercury earth station in Zanzibar during 1959-1964. To historicize the earth station’s establishment, the focus lies on the geopolitical and sociotechnical relations that resulted in the Zanzibar station.

ON-BOARD DIGITAL SWITCHING OPTIONS FOR CIVIL COMMUNICATION SATELLITES

2020 ◽  
Author(s):  
О.В. МЕНТУС ◽  
А.А. АКОПОВ
Keyword(s):  
Communication Systems ◽  
Satellite Communication ◽  
Satellite Communications ◽  
Provision Of Services ◽  
Digital Switching ◽  
Switching Options

Рассматриваются варианты построения полезных нагрузок с цифровой коммутацией для спутниковой связи на примере перспективного космического аппарата «Экспресс-АМУ4». Показано, что использование цифровой коммутации в отечественных спутниках связи позволяет обеспечить гибкость оказания услуг и более успешно конкурировать с зарубежными спутниковыми системами связи. This article considers variants of digital switching payloads for satellite communications on the example of a promising spacecraft Express-AMU4. It is shown that the use of digital switching in domestic communication satellites allows providing flexibility in the provision of services and more successfully competing with foreign satellite communication systems.

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