Forum for Science, Industry and Business

Sponsored by:     3M 
Search our Site:

 

Jules Verne demonstrates flawless Collision Avoidance Manoeuvre

17.03.2008
Mission controllers received confirmation shortly after 10:45 CET (09:45 UT) this morning that Jules Verne ATV had successfully demonstrated the critical Collision Avoidance Manoeuvre. The crucial test began at 08:57 CET (07:57 UT), and included placing the spacecraft into a minimally functioning 'survival' mode.

The in-flight Collision Avoidance Manoeuvre, or CAM, demonstration was necessary to prove that the spacecraft could reliably move away from the ISS in case of any problems during the final rendezvous and docking with the International Space Station. Upon detection of a critical failure or an unsafe situation, the spacecraft's Monitoring and Safing Unit (MSU) is designed to isolate the ATV's nominal systems and issue a CAM command.

"It went perfectly - the MSU commanded ATV exactly as expected. After that, we had a perfect recovery of the spacecraft, from sun-pointing safe mode, and we reset the on-board computers. ATV is back in cruise mode," said Alberto Novelli, ESA's Mission Director at the ATV Control Centre in Toulouse, France.

The complex procedure involved shutting down all of the normal control systems and placing the spacecraft into 'last-chance' survival mode. After the manoeuvre was positively demonstrated and confirmed, controllers implemented a lengthy 'exit-from-survival' recovery process that brought all systems back into nominal operation.

"The performance was absolutely flawless. We know now that it is completely safe for us to go to the Station because we always have an independent way to get away from it. This demonstrates that our back-up 'spacecraft within a spacecraft' works perfectly - it's good to have this tool in our back pocket," said John Ellwood, ESA's ATV Project Manager.

An enhanced team of some 60 mission controllers from ESA and French space agency CNES watched this morning's test intently from the ATV Control Centre. If any problems had occurred during survival mode, it would have been very difficult to recover the spacecraft.

"This independent mode relies on separate computers, separate software, separate batteries, separate trajectory monitoring sensors and separate thrusters. The only item shared with the ATV's main system is propellant," explained ESA astronaut Jean-François Clervoy, senior advisor to the ATV project.

The test was conducted with ATV orbiting well away from the ISS, and included a 200-second thruster burn, which took place as the spacecraft passed over northern Africa. A final orbit determination will be done later today.

The CAM demonstration was also monitored closely by ESA's ISS partners, with NASA operations personnel seated on console in the ATV Control Centre. The US and Russian ISS control centres and ESA's Columbus Control Centre also monitored the test. One important result of the demonstration was to prove to the partners that the CAM functionality was reliable and could assure the safety of the Station and crew members. The CAM demonstration results are now being analysed by the ISS partners.

Additional demonstrations of Jules Verne's functionality are scheduled later in the month, with actual rendezvous and docking planned for 3 April 2008.

Markus Bauer | alfa
Further information:
http://www.esa.int/SPECIALS/ATV/SEMWJMM5NDF_0.html

More articles from Physics and Astronomy:

nachricht NASA detects solar flare pulses at Sun and Earth
17.11.2017 | NASA/Goddard Space Flight Center

nachricht Pluto's hydrocarbon haze keeps dwarf planet colder than expected
16.11.2017 | University of California - Santa Cruz

All articles from Physics and Astronomy >>>

The most recent press releases about innovation >>>

Die letzten 5 Focus-News des innovations-reports im Überblick:

Im Focus: A “cosmic snake” reveals the structure of remote galaxies

The formation of stars in distant galaxies is still largely unexplored. For the first time, astron-omers at the University of Geneva have now been able to closely observe a star system six billion light-years away. In doing so, they are confirming earlier simulations made by the University of Zurich. One special effect is made possible by the multiple reflections of images that run through the cosmos like a snake.

Today, astronomers have a pretty accurate idea of how stars were formed in the recent cosmic past. But do these laws also apply to older galaxies? For around a...

Im Focus: Visual intelligence is not the same as IQ

Just because someone is smart and well-motivated doesn't mean he or she can learn the visual skills needed to excel at tasks like matching fingerprints, interpreting medical X-rays, keeping track of aircraft on radar displays or forensic face matching.

That is the implication of a new study which shows for the first time that there is a broad range of differences in people's visual ability and that these...

Im Focus: Novel Nano-CT device creates high-resolution 3D-X-rays of tiny velvet worm legs

Computer Tomography (CT) is a standard procedure in hospitals, but so far, the technology has not been suitable for imaging extremely small objects. In PNAS, a team from the Technical University of Munich (TUM) describes a Nano-CT device that creates three-dimensional x-ray images at resolutions up to 100 nanometers. The first test application: Together with colleagues from the University of Kassel and Helmholtz-Zentrum Geesthacht the researchers analyzed the locomotory system of a velvet worm.

During a CT analysis, the object under investigation is x-rayed and a detector measures the respective amount of radiation absorbed from various angles....

Im Focus: Researchers Develop Data Bus for Quantum Computer

The quantum world is fragile; error correction codes are needed to protect the information stored in a quantum object from the deteriorating effects of noise. Quantum physicists in Innsbruck have developed a protocol to pass quantum information between differently encoded building blocks of a future quantum computer, such as processors and memories. Scientists may use this protocol in the future to build a data bus for quantum computers. The researchers have published their work in the journal Nature Communications.

Future quantum computers will be able to solve problems where conventional computers fail today. We are still far away from any large-scale implementation,...

Im Focus: Wrinkles give heat a jolt in pillared graphene

Rice University researchers test 3-D carbon nanostructures' thermal transport abilities

Pillared graphene would transfer heat better if the theoretical material had a few asymmetric junctions that caused wrinkles, according to Rice University...

All Focus news of the innovation-report >>>

Anzeige

Anzeige

Event News

Ecology Across Borders: International conference brings together 1,500 ecologists

15.11.2017 | Event News

Road into laboratory: Users discuss biaxial fatigue-testing for car and truck wheel

15.11.2017 | Event News

#Berlin5GWeek: The right network for Industry 4.0

30.10.2017 | Event News

 
Latest News

NASA detects solar flare pulses at Sun and Earth

17.11.2017 | Physics and Astronomy

NIST scientists discover how to switch liver cancer cell growth from 2-D to 3-D structures

17.11.2017 | Health and Medicine

The importance of biodiversity in forests could increase due to climate change

17.11.2017 | Studies and Analyses

VideoLinks
B2B-VideoLinks
More VideoLinks >>>