Recent Successful Satellite Systems: Visions of the Future

2017 ◽  
Keyword(s):  
Satellite Systems ◽  
The Future

Universal communications via satellites — dream or future reality?

1979 ◽  
Vol 1 (2) ◽  
pp. 69-75
Author(s):  
A.E. Cawkell
Keyword(s):  
Satellite Systems ◽  
The Future ◽  
Infor Mation

Technical and political aspects are discussed with regard to the future of satellite systems such as Intelsat. The paper concludes with a number of questions of concern to infor mation scientists to be faced in the 1980s.

Earth stations for fixed and mobile services

1984 ◽  
Vol 312 (1519) ◽  
pp. 55-66
Keyword(s):  
Mobile Services ◽  
Political Factors ◽  
Operational System ◽  
Satellite Systems ◽  
The Past ◽  
Radiated Power ◽  
Mobile Stations ◽  
The Future ◽  
Technical Factors ◽  
Direct Broadcast

This paper discusses the evolution of fixed and mobile stations during the past two decades and extrapolates trends into the future. It is shown that for the various communications satellite systems discussed, i.e. international, domestic, maritime and direct broadcast, the terminal designs are controlled not only by technical factors but also by economic, organizational and political factors. . The net effect of these combined forces, while yielding less than optimum designs from a technical or economic viewpoint, has made for a remarkable growth in twenty years. From an experimental—operational system of four stations in 1965, which used a satellite with 10 W of effective radiated power, to, by 1990, millions of home television stations using a satellite of 200 kW effective radiated power per channel.

scholarly journals Study the capabilities of RTK Multi GNSS under forest canopy in regions of Indonesia

2019 ◽  
Vol 94 ◽  
pp. 01021 ◽  
Author(s):  
Heri Andreas ◽  
Hasanuddin Zainal Abidin ◽  
Dina Anggreni Sarsito ◽  
Dhota Pradipta
Keyword(s):  
Real Time ◽  
Forest Canopy ◽  
Global Navigation Satellite Systems ◽  
Navigation Satellite ◽  
Satellite Systems ◽  
Position Accuracy ◽  
The Earth ◽  
Real Time Kinematic ◽  
The Future ◽  
Global Navigation Satellite

For more than two decade, the position on the earth can be precisely determined “real-time” in the order of few centimeters by Real Time Kinematic (RTK) GNSS (Global Navigation Satellite Systems) Method. Nevertheless, few limitations are still recognized such as degradation of accuracy against limited satellite visibilities (e.g. heavy satellite obstructions from forest canopy). It usually takes time to resolve the ambiguities or even in many occasion resulted in failure. Fortunately since recent years to the future seems more satellite systems beside GPS and GLONASS are being launched such as BEIDOU, GALILEO, QZSS, etc. It means that more satellite will be existed above the sky. The term GNSS has changed into Multi GNSS. This Multi GNSS is theoretically adding the value to previous GNSS System like GPS; problems of limited satellite visibilities (e.g. under forest canopy) to the position accuracy perhaps will reduce. Within this paper we try to do study the capabilities of RTK Multi GNSS under forest canopy in Indonesia. We observed by RTK in the forest areas which have canopy of 40 to 90 percent. As conclusion we found improvement in positioning result of even area of very limited satellite visibilities.

“After 300 meters turn right” – the future of Russia’s GLONASS and the development of global satellite navigation systems

foresight ◽  
2014 ◽  
Vol 16 (5) ◽  
pp. 448-461 ◽  
Author(s):  
Mikhail B. Bokov ◽  
Anastasia Edelkina ◽  
Marina Klubova ◽  
Thomas Thurner ◽  
Natalia P. Velikanova ◽  
...  
Keyword(s):  
Large Scale ◽  
Global Navigation Satellite Systems ◽  
Navigation Systems ◽  
Niche Markets ◽  
Content Type ◽  
Satellite Systems ◽  
The Future ◽  
Comprehensive Picture ◽  
Satellite Navigation Systems ◽  
Global Navigation Satellite

Purpose – Global navigation satellite systems (GNSS) were designed to determine the exact location of objects on land, water and air for military purposes. With the opening of the satellite signal for civilian use, the technology created business opportunities for various applications. Today, satellite positioning technology is used by transporters, carriers, motorists, surveyors, builders, foresters, etc. through a wide array of devices like mobile phones or multimedia devices with built-in receiver modules. Design/methodology/approach – This paper provides the results of a recently held foresight exercise on the future development of Russia’s GLONASS system. Findings – The foresight exercise suggested a number niche markets where the GLONASS technology could be of great use, like monitoring of buildings and construction sides or the monitoring of shipments. In addition, in the case of Russia, large-scale government-driven investment programs will be key drivers for GLONASS’ growth perspectives. Originality/value – The paper provides a comprehensive picture of the development of GNSS for civilian use until 2020.

scholarly journals Reference system origin and scale realization within the future GNSS constellation “Kepler”

2020 ◽  
Vol 94 (12) ◽  
Author(s):  
Susanne Glaser ◽  
Grzegorz Michalak ◽  
Benjamin Männel ◽  
Rolf König ◽  
Karl Hans Neumayer ◽  
...  
Keyword(s):  
Time Synchronization ◽  
Solar Radiation Pressure ◽  
Terrestrial Reference Frame ◽  
Low Earth Orbit ◽  
Global Navigation Satellite Systems ◽  
Earth Orbit ◽  
Present System ◽  
Satellite Systems ◽  
The Future ◽  
German Aerospace

AbstractCurrently, Global Navigation Satellite Systems (GNSS) do not contribute to the realization of origin and scale of combined global terrestrial reference frame (TRF) solutions due to present system design limitations. The future Galileo-like medium Earth orbit (MEO) constellation, called “Kepler”, proposed by the German Aerospace Center DLR, is characterized by a low Earth orbit (LEO) segment and the innovative key features of optical inter-satellite links (ISL) delivering highly precise range measurements and of optical frequency references enabling a perfect time synchronization within the complete constellation. In this study, the potential improvements of the Kepler constellation on the TRF origin and scale are assessed by simulations. The fully developed Kepler system allows significant improvements of the geocenter estimates (realized TRF origin in long-term). In particular, we find improvements by factors of 43 for the Z and of 8 for the X and Y component w. r. t. a contemporary MEO-only constellation. Furthermore, the Kepler constellation increases the reliability due to a complete de-correlation of the geocenter coordinates and the orbit parameters related to the solar radiation pressure modeling (SRP). However, biases in SRP modeling cause biased geocenter estimates and the ISL of Kepler can only partly compensate this effect. The realized scale enabling all Kepler features improves by 34% w. r. t. MEO-only. The dependency of the estimated satellite antenna phase center offsets (PCOs) upon the underlying TRF impedes a scale realization by GNSS. In order to realize the network scale with 1 mm accuracy, the PCOs have to be known within 2 cm for the MEO and 4 mm for the LEO satellites. Independently, the scale can be realized by estimating the MEO PCOs and by simultaneously fixing the LEO PCOs. This requires very accurate LEO PCOs; the simulations suggest them to be smaller than 1 mm in order to keep scale changes below 1 mm.

Radionavigation at a Time of Decision

1997 ◽  
Vol 50 (2) ◽  
pp. 224-233
Author(s):  
David Last
Keyword(s):  
Rapid Development ◽  
Satellite System ◽  
Economic Benefits ◽  
Navigation Systems ◽  
Technical Adequacy ◽  
Satellite Systems ◽  
Institutional Issues ◽  
The Future ◽  
Global Navigation Satellite ◽  
The University

This paper and the following 5 papers were presented at the Institute's RIN-96 Conference, held at the University of Southampton, in September 1996. Copies of the complete Proceedings may be obtained from the Director. Price £6 members, £8.50 non-members.This is a time of unprecedented change in radio-navigation systems and practices. The rapid development of satellite technology is challenging navigation authorities in every country to question the future of terrestrial navigation systems. The technical adequacy of the new techniques is being demonstrated in many applications but there remain serious questions concerning the reliability, integrity and political control of the current satellite systems and their long-term future.The paper describes the operational principles of the present satellite Global Positioning System (GPS) and GLONASS. It compares them with terrestrial aids, identifying their advantages and drawbacks. Accuracy, availability and integrity are considered. The reasons for the development of differential operation are examined.Finally, the paper looks at the future of satellite systems and addresses some of the difficult institutional issues concerning satellite navigation with which navigation authorities worldwide are having to grapple. It reviews the development of the future Global Navigation Satellite System (GNSS) and identifies the economic benefits it could bring.

Satellite-Based Mobile Multiservices Platform

2011 ◽  
pp. 3356-3363 ◽  
Author(s):  
Alexander Markhasin
Keyword(s):  
Mobile Communications ◽  
Information Technologies ◽  
Low Cost ◽  
Dynamic Control ◽  
Mac Protocols ◽  
Fourth Generation ◽  
Medium Access ◽  
Satellite Systems ◽  
Geographically Dispersed ◽  
The Future

The future fourth generation (4G) of the satellite-based wireless and mobile communications is particularly important for global providing of the mobile broadband global information technologies (IT) multi-services and mobile e-applications (m-applications) for geographically dispersed mass users in support of anytime, anywhere, and any required quality of service (QoS) capabilities in a low-cost way. The recent broadband satellite systems described in Ivancic et al. (1999), Evans et al. (2005), Skinnemoen, Vermesan, Iuoras, Adams, and Lobao (2005) are based mainly on centralized low-­meshed architecture with very high traffic concentration. Such structure is not adequate in context of the traffic topology for rural, remote, and difficult for access (RRD) regions. Markhasin (2001) noted that the cost of centralized systems is unacceptably large for deployment of future mass broadband communications in RRD regions (North Siberia, Scandinavia, Greenland, Canada, Alaska, Central and South East Asia, South America, Australia, etc.). As it was shown in Markhasin (2001, 2004), the future low-cost IT multi-service platforms for RRD regions can be built optimal on a mix of the terrestrial and satellite-based mobile and wireless communications with radically distributed (neural-­like) all-­IP/ATM architecture that requires breakthrough steps for search advanced satellite, mobile, and wireless 4G technologies. Markhasin (1996) and Frigon, Chan, and Leung (2001) noted that the improvement of medium access control (MAC) protocols has a dominant effect on ensuring the breakthrough features of future QoS-aware mobile and wireless technologies. The survey and analytical comparison of the fundamental principles of QoS-oriented MAC protocols were described in Markhasin, Olariu, and Todorova (2004, 2005). The radically novel multi-­functional MAC technology (MFMAC) for long-delay space mediums with fully distributed dynamic control of QoS, traffic parameters, and bandwidth resources was proposed in Markhasin (2001, 2004). This article will be focused on future QoS-aware, satellite-based, fully distributed, mesh, and scalable mobile IT multi-service and m-Applications platform’s networking technology 4G for RRD regions.

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