Featured Research

from universities, journals, and other organizations

Jules Verne Demonstrates Flawless Collision Avoidance Maneuver

Date:
March 14, 2008
Source:
European Space Agency
Summary:
Mission controllers received confirmation shortly March 14 that Jules Verne ATV had successfully demonstrated the critical Collision Avoidance Maneuver. The crucial test included placing the spacecraft into a minimally functioning "survival" mode.

The Automated Transfer Vehicle (ATV) is the first fully automatic re-supply spacecraft of its kind. ESA's Jules Verne ATV is the first European space supplier for the ISS. Its launch is scheduled on 9 March from Europe's spaceport in Kourou, French Guiana.
Credit: ESA - D.Ducros

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-Franηois 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.


Story Source:

The above story is based on materials provided by European Space Agency. Note: Materials may be edited for content and length.


Cite This Page:

European Space Agency. "Jules Verne Demonstrates Flawless Collision Avoidance Maneuver." ScienceDaily. ScienceDaily, 14 March 2008. <www.sciencedaily.com/releases/2008/03/080314112239.htm>.
European Space Agency. (2008, March 14). Jules Verne Demonstrates Flawless Collision Avoidance Maneuver. ScienceDaily. Retrieved August 20, 2014 from www.sciencedaily.com/releases/2008/03/080314112239.htm
European Space Agency. "Jules Verne Demonstrates Flawless Collision Avoidance Maneuver." ScienceDaily. www.sciencedaily.com/releases/2008/03/080314112239.htm (accessed August 20, 2014).

Share This




More Space & Time News

Wednesday, August 20, 2014

Featured Research

from universities, journals, and other organizations


Featured Videos

from AP, Reuters, AFP, and other news services

Space to Ground: Hello Georges

Space to Ground: Hello Georges

NASA (Aug. 18, 2014) — Europe's ATV-5 delivers new science and the crew tests smart SPHERES. Questions or comments? Use #spacetoground to talk to us. Video provided by NASA
Powered by NewsLook.com
Tiny Satellites, Like The One Tossed From ISS, On The Rise

Tiny Satellites, Like The One Tossed From ISS, On The Rise

Newsy (Aug. 18, 2014) — The Chasqui I, hand-delivered into orbit by a Russian cosmonaut, is one of hundreds of small satellites set to go up in the next few years. Video provided by Newsy
Powered by NewsLook.com
This Week @ NASA, August 15, 2014

This Week @ NASA, August 15, 2014

NASA (Aug. 15, 2014) — Carbon Observatory’s First Data, ATV-5 Delivers Cargo, Cygnus Departs Station and more... Video provided by NASA
Powered by NewsLook.com
Space Shuttle Replica Hoisted for Landmark Exhibit

Space Shuttle Replica Hoisted for Landmark Exhibit

Reuters - US Online Video (Aug. 14, 2014) — The space shuttle replica Independence has been hoisted atop Space Center Houston's shuttle carrier aircraft, creating a monument to the shuttle program which will open to the public next year. Rough Cut (no reporter narration). Video provided by Reuters
Powered by NewsLook.com

Search ScienceDaily

Number of stories in archives: 140,361

Find with keyword(s):
 
Enter a keyword or phrase to search ScienceDaily for related topics and research stories.

Save/Print:
Share:  

Breaking News:
from the past week

In Other News

... from NewsDaily.com

Science News

Health News

Environment News

Technology News



Save/Print:
Share:  

Free Subscriptions


Get the latest science news with ScienceDaily's free email newsletters, updated daily and weekly. Or view hourly updated newsfeeds in your RSS reader:

Get Social & Mobile


Keep up to date with the latest news from ScienceDaily via social networks and mobile apps:

Have Feedback?


Tell us what you think of ScienceDaily -- we welcome both positive and negative comments. Have any problems using the site? Questions?
Mobile iPhone Android Web
Follow Facebook Twitter Google+
Subscribe RSS Feeds Email Newsletters
Latest Headlines Health & Medicine Mind & Brain Space & Time Matter & Energy Computers & Math Plants & Animals Earth & Climate Fossils & Ruins