Ehsan Mousivand; Sajjad Ghazanfarinia; Yaser Saffar; Masoud Khoshsima
Abstract
Satellite Constellations are the new approach to achieve the applications that were presumably expected from large and complex satellites. This paper reviews activities and related satellite constellation of about 130 companies and research institutes, showing that Communication Missions (Internet of ...
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Satellite Constellations are the new approach to achieve the applications that were presumably expected from large and complex satellites. This paper reviews activities and related satellite constellation of about 130 companies and research institutes, showing that Communication Missions (Internet of Things and Machine to Machine Services) are the most desirable for Constellations with 27% of all. Earth Observation constellations are in the next rank with 19%. The most favorite configuration in Constellations is based on Microsatellites with 42%, out of which Cubesats are of more interest. The research is going to present the role of Cubesats with some statistical analysis to show how these Space Systems may affect the future of Space Industry and Economy with Solutions based on Constellations. Results discuss the Future of Constellations and Cubesats and their common effect on New Space both in Space Industry Level and Space Economy. This review may help researchers to work on similar studies with business approaches, too.
mechanic
Sajjad Ghazanfarinia; Ehsan Mousivand; Masoud Khoshsima; Yaser Saffar
Abstract
This research is going to present design of a LEO Constellation for Navigation service with minimum number of Satellites. The goal is to achieve Dilution Of Precision (DOP) less than 6. This Requirement is going to be achieved using predefined launch vehicles limitation on orbit which is 500 km in circular ...
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This research is going to present design of a LEO Constellation for Navigation service with minimum number of Satellites. The goal is to achieve Dilution Of Precision (DOP) less than 6. This Requirement is going to be achieved using predefined launch vehicles limitation on orbit which is 500 km in circular orbit altitude and 55 degrees for orbit inclination. Design has been done based on Analyses resulting in Optimization for least number of Satellites in this orbit, to satisfy all requirements for Navigation Performance and in conformance with the constraints related to launch and orbit. Multiple analyses have been done resulted in Constellation with 324 satellites, formed in 18 Orbits with 18 Satellites in each. This design shows the performance of 4.7 in DOP for a User located in Tehran, however, the distribution of DOP over the target area shows that the requirement has been passed through the whole region.
Mission design
Yaser Saffar; Sajjad Ghazanfarinia; Masoud Khoshsima; Shiva Emami
Abstract
This paper reviews design of Constellation for independent satellite-based navigation system with Middle East region coverage for regional positioning and augmentation service. Space segment of this constellation is composed of nine satellites in four orbits in such way three satellites have been placed ...
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This paper reviews design of Constellation for independent satellite-based navigation system with Middle East region coverage for regional positioning and augmentation service. Space segment of this constellation is composed of nine satellites in four orbits in such way three satellites have been placed on one GEO and two satellites on each three IGSO. In the coverage area, ground segment includes eleven ground monitoring stations, two masters and tracking control stations and twenty wide area reference stations are assigned only for augmentation with their master and uplink stations. Here we centered on space segment and specially design a navigation constellation system as a main orientation in this investigation and evaluation of the performance of the navigation system by combination with other satellite-based navigation systems. Hence, the parameters corresponding to navigation accuracy have been analyzed and compared with other active GNSS constellations. Analyses results express that geometric accuracy (GACC) of the designed system is solely 16 meters in 95% of a day in all points of desired area and in the case of combination with BeiDou and GPS the GACC would be improved to 14 and 12.5 meters respectively.
space climate
Omid Shekoofa; Masoud Khoshsima; Sajad Ghazanfarinia; Farhad Bagheroskouei
Abstract
This article discusses the need for research, monitoring and forecasting services related to space weather events and the establishment of a national center to achieve these goals. It starts with an introduction to the growing dependence of human civilization on advanced technologies, including space ...
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This article discusses the need for research, monitoring and forecasting services related to space weather events and the establishment of a national center to achieve these goals. It starts with an introduction to the growing dependence of human civilization on advanced technologies, including space technology, and with an overview of the big investments and costs incurred in building critical infrastructures on Earth and in space. Then, this paper investigates the vulnerability of these infrastructures to space weather events and the need to monitor and predict these phenomena. In the next section, some examples of monitoring and forecasting systems created by different countries and space organizations are introduced. Also, the need to establish a national center in Iran is proposed. The initial organizational structure and mechanism for the activities and cooperation between this center and other national and international institutions are discussed. Finally, different types of actions and the most important activities that can be carried out in this center are presented.
