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243 results found
Advanced Automation Concept for Complex Constellation Management

Recently, a variety of satellite constellations, some of them featuring over a thousand satellites, were announced. While similar concepts for large constellations already existed in the past, existing satellite constellations hardly ever feature triple-digit satellite quantities. At the time of writing, the world’s largest constellation is operated by Planet Labs and consists of 190+ Dove spacecraft.

Germany

15/117

TU Braunschweig
Assessment of access availability of space-ground optical links

Optical satellite communications play an increasingly important role in a number of space applications. However, if the system concept includes optical links to the surface of Earth, the limited availability due to clouds and other atmospheric impacts need to be considered to give a reliable estimate of the system performance. An OGS network is required for increasing the availability to acceptable figures.

Germany

12-037

DLR - German Aerospace...
Lunar ISRU Demonstration Mission Definition Study Segment 2

The main aspect of this study is to investigate the feasibility of the mission concept and the demonstration of the economic viability of a commercial payload delivery service to the Moon, as well as demonstrating the production of water/or oxygen with materials from the Moon. The study considered a payload delivery service that would be an end-to end service from Earth to a targeted location on the Moon, launched not later than 2025.

Germany

18_M-HRE-1A

PTScientists
Conceiving a lunar base using 3D printing technologies.

Several studies have addressed the building of a lunar base either under ESA or other space agencies and entities. These studies have looked at conceptual designs, often of one specific element of the base, while most of the requirements are not adequately or not at all taken into consideration.

Germany

15/012

OHB System AG
Delay tolerant network for flexible communication with EO satellites

The DTN-EO study was initiated in order to research the performance of DTN in future missions, particularly Earth observation and constellation-type missions. In the original proposal, ESA stipulated three scenarios which were to be tested: Earth observation, constellation, and exploration missions. These scenarios built upon each other, starting with an Earth observation-centric mission such as the Sentinel missions, before moving to a large constellation. Ultimately, the DTN network from the first two scenarios was expanded to represent a deep-space exploration mission.

Germany

15/093

GMV
Numerical Simulations for Spacecraft Catastrophic Disruption Analysis

While the vast majority of space debris still stems from explosion events of satellites and rocket upper stages, current forecasts state that collisions, such as those between the Cosmos 2251 and Iridium 33 satellites in 2009, will play a dominant role in the mid-term future when a critical spatial density of satellites has been reached. In order to assess the risks emanating from space debris, a deeper understanding of the formation and residence time of breakup debris in orbit is essential for operational activities.

Germany

15/716-b

Fraunhofer Gesellschaft
General Relativity Experiment with Galileo satellites 5 and 6 (GREAT)

The GREAT project provides an improved test of Einstein's theory of general telativity by analysing the relativistic gravitational redshift as observed in the clock data from GSAT-0201 and GSAT-0202. These satellites have been injected into highly eccentric orbits following a launch mishap, providing us with the unique chance to perform an important test of fundamental physics.

Germany

15/711

ZARM
End of Life operations for disposal of mega‐constellations

The objective of this activity was to understand the operational complexity of large mega-constellation systems, and the potential needs to operate these, including the complexity of collision avoidance manoeuvres (CAMs). This objective was achieved by:

Germany

15/052

Airbus Defence &...
Characterisation of particulates in the upper troposphere/lower stratosphere

The Process Exploration through Measurement of infrared and millimetre-wave Emitted Radiation (PREMIER) instrument was proposed to ESA within the framework of the 7th Earth Explorer Call. The instrument was designed to quantify dynamic, radiative, and chemical processes in the upper troposphere and lower stratosphere (UTLS) that control the global atmospheric composition.

Germany

13-055

Forschungszentrum Jülich
Assessment of a Methodology for the Certification of Safety GNC Critical Space Systems

The project is aimed at investigating and assessing methods for the certification of the design and development of Guidance, Navigation, and Control (GNC) systems for autonomous space missions.
The general objectives of the project are:
• To improve the certification processes (verification, validation, and assurance activities) of safety GNC critical space systems with the goal to reduce the cost, manpower and time for certification.
• To perform research on alternative approaches to reliability and certification to the current practices.

Germany

16/702

Fortiss

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