| In-Orbit Performance Assessment of Giove Clocks |
01-Dec-2008 |
15 pages |
| Authors:
Pierre Waller; P Tavella; I Sesia; G Tobias; I Hidalgo; R Piriz; S Binda; J Hahn; F Gonzalez; G Cerretto; EUROPEAN SPACE AGENCY NOORDWIJK (NETHERLANDS)
|
 | Two onboard atomic clock technologies have been developed for the Galileo system, one based on vapor cell rubidium technology (RAFS: Rubidium Atomic Frequency Standard) and one based on passive hydrogen maser (PHM) technology. In the years 2004-2005, both technologies have successfully passed a full qualification campaign (including shock, vibration, thermal vacuum, ...) aimed at verifying their performance in a Galileo-like environment. In the year 2005, six RAFS and two PHM ... |
|
| Technical Status of the Galileo System Development |
01-Nov-2007 |
15 pages |
| Authors:
Joerg H Hahn; EUROPEAN SPACE AGENCY NOORDWIJK (NETHERLANDS)
|
| The development of the Galileo System continues under the partnership of the European Commission and the European Space Agency. ESA is charged with the development of the elements of the "Global Component," which will be comprised of the complete constellation of satellites together with the ground segment. The ESA development will culminate in the establishment of an In Orbit Validation (IOV) milestone, which will contain a minimum number of each ... |
|
| Giove-A Apparent Clock Assessment and Results |
01-Nov-2007 |
21 pages |
| Authors:
Joerg H Hahn; Patrizia Tavella; Marta Cueto; Virginia Fernandez; Alvaro Mozo; Ricardo Piriz; Daniel Navarro-Reyes; Pierre Waller; Francisco Gonzalez; Ilaria Sesia; EUROPEAN SPACE AGENCY NOORDWIJK (NETHERLANDS)
|
| The performance of the Galileo space-borne clocks is of importance for navigation and integrity at the corresponding user level. Clock estimation and prediction errors are directly mapped into the User Equivalent Range Error (UERE). The clock quality also affects the integrity performance of the Galileo system: clock "feared events," such as frequency and phase jumps, have to be characterized and adequate barriers built against them. In addition, the clocks operate ... |
|
| Aerothermodynamic Reentry Flight Experiments - EXPERT |
OCT 2005 |
130 pages |
| Authors:
J. Muylaert; L. Walpot; H. Ottens; F. Cipollini; EUROPEAN SPACE AGENCY NOORDWIJK (NETHERLANDS)
|
| The paper addresses the ESA in flight Aerothermodynamic (ATD) research programme referred to as EXPERT: the European EXPerimental Re-entry Testbed. The objective of this in-flight research programme is to design and instrument generic configurations, for in-flight measurements of critical ATD phenomena using state-of-the-art instrumentation. Hypersonic flight data are required for improved understanding of the following critical ATD phenomena : 1) Transition, 2) Catalicity and oxidation, 3) Real gas effects on ... |
|
| Lessons Learned with the Innovation Triangle Initiative |
13 JUL 2005 |
9 pages |
| Authors:
Marco Freire; Marco Guglielmi; Stephane Lascar; EUROPEAN SPACE AGENCY NOORDWIJK (NETHERLANDS)
|
| One of the roles of the European Space Agency (ESA) is to support the introduction of technology innovation in the space environment. This is the aim of the Innovation Triangle Initiative (ITI), whose specific goal is to explore technologies or services for space applications that are not currently being used or exploited in the context of space, but that have the potential for being the seed for significant innovation. ITI ... |
|
Reports by Corporate Author
