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D'Amico S.,German Aerospace Center | Ardaens J.-S.,German Aerospace Center | Larsson R.,OHB Sweden | Larsson R.,German Space Operations Center
Journal of Guidance, Control, and Dynamics | Year: 2012

The Prototype Research Instruments and Space Mission Technology Advancement (PRISMA) represents the first European technology demonstration of formation-flying and on-orbit-servicing techniques. Several hardware and software experiments, either at subsystem or system levels, have been successfully conducted since the launch of the dual-satellite mission in June 2010. This paper describes the guidance, navigation, and control functionalities and presents key flight results from the so-called Spaceborne Autonomous Formation-Flying Experiment (SAFE) executed in September 2010 and March 2011 as one of the primary PRISMA mission objectives. SAFE is intended to demonstrate autonomous acquisition, keeping, and reconfiguration of passive relative orbits for advanced remotesensing and rendezvous applications. As shown in the paper, the onboard Global Positioning System navigation system provides relative orbit information in real time with an accuracy better than 10 cm and 1 mm=s (threedimensional, root mean square) in position and velocity, respectively. The impulsive formation control achieves accuracies better than 10m(three-dimensional, root mean square) for separations below 2 km with minimum usage of thrusters, ensuring high predictability for simplified mission operations and minimum collision risk for increased safety. © 2011 by Simone D'Amico, Jean-Sebastien Ardaens, and Robin Larsson. Source

Von Scheele F.,Omnisys | Vinterhav E.,OHB Sweden | Vooras M.,Enterprise Estonia
62nd International Astronautical Congress 2011, IAC 2011 | Year: 2011

Space organisations in Estonia, Latvia, Lithuania and Poland (ELLP) have joined forces with the experienced space organisations Swedish Space Corporation and International Space University in the ambitious Nordic BaltSat project (NBS). NBS is an effort to facilitate the development of the space sector in the ELLP countries. The countries all have the ambition to join ESA as full members and have signed PECS agreements entering the path to membership. The potential of their respective space sectors rests on a history and experience of space activities dating back to the dawn of the space age as well as current technologies that can further be integrated and exploited in the European space sector. The objective of NBS is to identify existing and potential space organisations in niches where they have positions of relative strength, to raise awareness of the space sector in the business communities and local decision makers and to educate them on how the European space sector works. A space technology survey was performed in late 2010 and serves as the foundation for a Joint Technology Programme (JTP) for ELLP. In the JTP existing technologies are matched to critical technologies as identified by EDA/ESA /EU, ESA programmes in general, the IAP and PECS in particular, and with national space policies. From the results of the analysis a roadmap is prepared that suggests a common path for the ELLP space organisations into the larger European space framework, as attractive partners. The paper presents an overview of existing space technologies in ELLP, the match with critical technologies and highlights the roadmap resulting from the analysis that suggests a common path for the ELLP space organisations into the larger European space framework, as attractive partners Copyright ©2010 by the International Astronautical Federation. All rights reserved. Source

Vinterhav E.,OHB Sweden | Von Scheele F.,Omnisys
62nd International Astronautical Congress 2011, IAC 2011 | Year: 2011

The House on the Moon could be the first deep space art installation ever. The project is an endeavour to put a traditional red Swedish house with white corners on the surface on the lunar surface as a cultural symbol. The project is set up as a public private partnership where private interests participate for commercial returns and public organisation participate for scientific returns. In the process of moving the project forward a feasibility study of a national Swedish lunar lander mission was prepared that indicated that placing 30kg payload on the lunar surface could be achieved at a cost of less than 100 million Euros. Technical studies on the house indicate that it is possible to design a 10kg and 6-litre payload that will deploy autonomously into a house with the dimensions of 2,5 x 3.0m x 2.0m. The House payload is estimated to fit inside a cost of 3 million Euros. Finding a way to finance the House on the Moon is a challenge and the funding model for the mission is a combination of inviting external partners to pay for sharing the additional 20 kg payload capacity and sponsorship. The paper outlines the House on the Moon project, its artistic concept, commercial models and technical models and its progress to date. Copyright ©2010 by the International Astronautical Federation. All rights reserved. Source

Bodin P.,OHB Sweden | Nylund M.,Swedish Defence Research Agency | Battelino M.,OHB Sweden
Acta Astronautica | Year: 2012

The satellite simulator SATSIM was developed during the experimental PRISMA multi-satellite formation flying project and was primarily aimed to validate the Guidance, Navigation and Control system (GNC) and the on-board software in a simulated real-time environment. The SATSIM system has as a main feature the ability to simulate sensors and actuators, spacecraft dynamics, intra-satellite communication protocols, environmental disturbances, solar illumination conditions as well as solar and lunar blinding. The core of the simulator consists of MATLAB/Simulink models of the spacecraft hardware and the space environment. The models run on a standard personal computer that in the simplest scenario may be connected to satellite controller boards through a CAN (Controller Area Network) data bus. SATSIM is, in conjunction with the RAMSES Test and Verification system, able to perform open-loop, hardware-in-the-loop as well as full-fledged closed-loop tests through the utilisation of peripheral sensor unit simulators. The PRISMA satellites were launched in June 2010 and the project is presently in its operational phase. This paper describes how a low cost but yet reliable simulator such as the SATSIM platform in different configurations has been used through the different phases of a multi-satellite project, from early test of onboard software running on satellite controller boards in a lab environment, to full-fledged closed-loop tests of satellite flight models. © 2011 Elsevier Ltd. All rights reserved. Source

Gohardani A.S.,Springs of Dreams Corporation | Stanojev J.,OHB Sweden | Demaire A.,OHB Sweden | Anflo K.,ECAPS | And 3 more authors.
Progress in Aerospace Sciences | Year: 2014

Currently, toxic and carcinogenic hydrazine propellants are commonly used in spacecraft propulsion. These propellants impose distinctive environmental challenges and consequential hazardous conditions. With an increasing level of future space activities and applications, the significance of greener space propulsion becomes even more pronounced. In this article, a selected number of promising green space propellants are reviewed and investigated for various space missions. In-depth system studies in relation to the aforementioned propulsion architectures further unveil possible approaches for advanced green propulsion systems of the future. © 2014 Elsevier Ltd. Source

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