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

We report on a new test of the gravitational redshift and thus of local position invariance, an integral part of the Einstein equivalence principle, which is the foundation of general relativity and all metric theories of gravitation. We use data spanning 1008 days from two satellites of Galileo, Europe’s global satellite navigation system (GNSS), which were launched in 2014, but accidentally delivered into elliptic rather than circular orbits. The resulting modulation of the gravitational redshift of the onboard atomic clocks allows the determination of redshift with high accuracy.

France

15/710

SYRTE
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
Completing the atmospheric sounding system with GNSS and platform integrated sensors

The basic goal of this project was to analyse how the usage of non-conventional data (i.e. 'data of opportunity') in conjunction with conventional data could help improve the estimation of parameters for weather and space weather. Conventional data it is considered to be data coming from well-known sources such as permanent GNSS receivers (e.g. receivers from IGS or EUREF networks) while non-conventional data is considered to be GNSS data from research vessels or mass-market GNSS receivers (such as smartphones or other single-frequency GNSS chipsets).

Spain

15/134

Rokubun
Mission performance assessment for space science missions

The objective of this activity was to propose a general infrastructure of an end-to-end simulator (E2ES) for space science missions, namely an E2ES requirements baseline, reference architecture and an associated library of software models (building blocks, BB) to promote reuse, standardisation and reduction of engineering costs by defining a products/science validation process throughout the lifecycle based on an E2ES.

Italy

16/S10

University of Trieste
High-Altitude pseudo-satellites for telecommunication and complementary space applications

The interest in HAPS is increasing in many areas, from military and security to commercial services. On the telecommunications side, HAPS are seen as relays to provide internet services worldwide, and as a possible complement to satellites. On the Earth observation side, the near-space location of the HAPS enables new services or could improve the existing satellite ones. From the satellite or from the HAPS market sides, it is important to understand how both systems can offer complementary services, and what the possible synergies between them are.

France

15/708-b

Airbus Defence &...
Reliable TT&C during superior solar conjunctions

The purpose of this study was to define the a communication subsystem architecture (including both ground and space segments, as well as operational methods) that allows robust RF TT&C links during superior solar conjunction phases. The defined architecture shall ensure robust and reliable links in scintillation regimes (i.e. at low SEP angles) where TT&C links are nowadays degraded, leading to occasional link interruptions. Similarly, the defined architecture shall ensure that at even higher scintillation regimes (i.e.

Italy

13-028-a

University of Bologna
Feasibility study of Active Debris Mitigation for Mega Constellations

The Thales Alenia Space study team completed a 13 month contract to study the feasibility of Active Debris Removal within mega-constellations. Within the Clean Space initiative, ESA searches for proactive answers to the environmental challenges which are faced both on Earth and in space. The Inter-Agency Space Debris Coordination Committee (IADC) has already highlighted the important topic of mega-constellations, which represent a step change in the future space environment due to the proliferation of small satellites.

France

15/099

Thales Alenia Space
EXPERT: Mars Sample Return architecture assessment study

Several hundred mission scenarios were analysed with a high level of detail both at mission analysis and mass budget level, to properly identify robust and feasible solutions. Three of them make use of both staging and aero-braking to reduce the spacecraft wet mass (mass with fuel), and they all rely either on chemical propulsion or on a mixed system combining a chemical engine with two very powerful electrical thrusters (ARM engines).

Spain

17/M-03-01

Deimos Madrid
Feasibility of ultra low thrust transfers in L1, L2, Sun, Earth & Moon Systems

A set of tools has been developed to enable assessment of the feasibility of ultra-low thrust transfers in regions of multi-body gravity field influence. Aspects include:

France

15/723-a

Airbus Defence &...
Benchmarking re-entry prediction uncertainties (Parallel b)

The project is dedicated to an in-depth study of the re-entry of ESA's Gravity Field and Steady-State Ocean Circulation Explorer (GOCE), for which a rich measurement dataset is available up to the very end of its decay phase.

Italy

14-608-b

Space Dynamics Services

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