Marque-page social
Conservez et partagez l'adresse de Ovni et vie extraterrestre | Les mystères des Ovnis sur votre site de social bookmarking
Derniers sujets
Quand cinq pilotes de l'US Navy décrivent des rencontres récentes faites grâce à un nouveau radar embarquéAujourd'hui à 04:41GenuineUFOsLe GEIPAN et son traitement du phénomène OvniAujourd'hui à 04:36GenuineUFOsQuand le Pentagone étudie les ovnis dans le plus grand secret. Un article du New York TimesAujourd'hui à 03:56GenuineUFOsCrop Circles et Ovnis messages ou arnaques?Aujourd'hui à 00:41Polyèdre57aucun sujetHier à 22:12Polyèdre572011: le /08 à Entre 23 heures et 2 heures du matin - Un phénomène ovni troublant - Ovnis à Bourgogne - Yonne (dép.89)Hier à 20:23valeryAstrobiologie sur PodcastScienceHier à 19:51Hector01Présentation bis repetitaHier à 19:22Nanou TiDes bases Ovni souterraines dans l’Himalaya?Hier à 19:16HocineFaire de faux Crop circles, c'est facile! (Arnaud Thiry)Hier à 15:50GenuineUFOsPérou : réactivation du bureau d'enquêtes sur les Ovnis de l'armée de l'AirHier à 15:09Roland62Envoyer votre nom sur Mars avec le prochain Rover de la NASAHier à 14:35pat04Si les extraterrestres existent, pourquoi aucun contact?Mar 18 Juin 2019, 22:54Hector01Vidéo d'un OVNI filmé le 3 juin 2019 à AuxerreMar 18 Juin 2019, 22:24LorelinePourquoi les Ovni s'interessent-ils au Nucléaire?Mar 18 Juin 2019, 19:38HocineOVNI à Wichita au KansasMar 18 Juin 2019, 19:09Roland62(Topic unique): Etude des méprises vos documents et expériencesMar 18 Juin 2019, 19:06GenuineUFOs[Speculations] vol mh370 intriguantLun 17 Juin 2019, 22:25GenuineUFOsLes Rencontres du troisième type RR3 (discussion et étude)Lun 17 Juin 2019, 17:31HocineOvni Haïti, Port-au-Prince 1er juin 2019Dim 16 Juin 2019, 22:15Polyèdre57 Woltersum, Groningen, Pays-Bas 15 juin 2019Dim 16 Juin 2019, 22:04Polyèdre57PrésentationDim 16 Juin 2019, 01:53LorelinePrésentation rayaboxDim 16 Juin 2019, 01:47LorelineLa thèse de doctorat de Jean-Michel Abrassart sur les ovnis: fadaises pseudo-sceptiques et bêtises anti-scientifiquesSam 15 Juin 2019, 17:37Polyèdre57Archives OVNI en FranceSam 15 Juin 2019, 00:26Polyèdre57Scepticisme et MIBVen 14 Juin 2019, 18:55anakinTaches de JupiterVen 14 Juin 2019, 14:06anakin(2007) L'observation d'Ovni de Ray Bowyer à Guernsey Jeu 13 Juin 2019, 18:05GenuineUFOsSujet unique: Les pyramides dans le mondeJeu 13 Juin 2019, 13:55LorelineQui connait le MUFON France ?Mer 12 Juin 2019, 19:04martin
Annonce
Annonce
Partagez
Voir le sujet précédentAller en basVoir le sujet suivant
mac.nivols
mac.nivols
Administrateur sécurité
Administrateur sécurité
SEXTANT : utiliser les rayons X pour naviguer dans l'espace profond Empty

Masculin Nombre de messages : 2415
Inscription : 18/12/2010
Localisation : Bourges
Emploi : Actif
Passions : PAN-Météorologie-Astronomie-Aéronautique-Sciences-Photographie-Informatique
Règlement : Règlement
Points de Participation : 6392
https://www.forum-ovni-ufologie.com

Ovnis SEXTANT : utiliser les rayons X pour naviguer dans l'espace profond

le Lun 15 Jan 2018, 22:15
SEXTANT : utiliser les rayons X pour naviguer dans l'espace profond Nicerclose2
L'agence spatiale américaine explique qu'elle a développé une technologie permettant d'exploiter des rayons X émis par des pulsars milliseconde afin de déterminer de manière précise la position d'un objet se déplaçant à une vitesse de plusieurs milliers de km/h.
Baptisé Station Explorer for X-ray Timing and Navigation Technology (SEXTANT), le système utilise une technique qui est dans la même veine que celle du positionnement par satellites sur Terre (GPS, Galileo, etc.).
« Cette technologie offre une nouvelle option pour la navigation dans l'espace profond, qui pourrait fonctionner de concert avec les systèmes radio et optiques existants » ajoute la NASA.
Source : https://www.nextinpact.com/brief/nasa---sextant-utilise-les-rayons-x-pour-naviguer-dans-l-espace-profond-2136.htm

Et la partie détaillée en anglais : https://www.nasa.gov/feature/goddard/2018/nasa-team-first-to-demonstrate-x-ray-navigation-in-space

Jan. 11, 2018


[size=31]NASA Team First to Demonstrate X-ray Navigation in Space
[/size]

In a technology first, a team of NASA engineers has demonstrated fully autonomous X-ray navigation in space — a capability that could revolutionize NASA’s ability in the future to pilot robotic spacecraft to the far reaches of the solar system and beyond.


The demonstration, which the team carried out with an experiment called Station Explorer for X-ray Timing and Navigation Technology, or SEXTANT, showed that millisecond pulsars could be used to accurately determine the location of an object moving at thousands of miles per hour in space — similar to how the Global Positioning System, widely known as GPS, provides positioning, navigation, and timing services to users on Earth with its constellation of 24 operating satellites.

“This demonstration is a breakthrough for future deep space exploration,” said SEXTANT Project Manager Jason Mitchell, an aerospace technologist at NASA’s Goddard Space Flight Center in Greenbelt, Maryland. “As the first to demonstrate X-ray navigation fully autonomously and in real-time in space, we are now leading the way.”

This technology provides a new option for deep space navigation that could work in concert with existing spacecraft-based radio and optical systems.

Although it could take a few years to mature an X-ray navigation system practical for use on deep-space spacecraft, the fact that NASA engineers proved it could be done bodes well for future interplanetary space travel. Such a system provides a new option for spacecraft to autonomously determine their locations outside the currently used Earth-based global navigation networks because pulsars are accessible in virtually every conceivable fight regime, from low-Earth to deepest space.

Exploiting NICER Telescopes

The SEXTANT technology demonstration, which NASA’s Space Technology Mission Directorate had funded under its Game Changing Program, took advantage of the 52 X-ray telescopes and silicon-drift detectors that make up NASA’s Neutron-star Interior Composition Explorer, or NICER. Since its successful deployment as an external attached payload on the International Space Station in June, it has trained its optics on some of the most unusual objects in the universe.

“We’re doing very cool science and using the space station as a platform to execute that science, which in turn enables X-ray navigation,” said Goddard’s Keith Gendreau, the principal investigator for NICER, who presented the findings Thursday, Jan. 11, at the American Astronomical Society meeting in Washington. “The technology will help humanity navigate and explore the galaxy.”

NICER, an observatory about the size of a washing machine, currently is studying neutron stars and their rapidly pulsating cohort, called pulsars. Although these stellar oddities emit radiation across the electromagnetic spectrum, observing in the X-ray band offers the greatest insights into these unusual, incredibly dense celestial objects, which, if compressed any further, would collapse completely into black holes. Just one teaspoonful of neutron star matter would weigh a billion tons on Earth.


Although NICER is studying all types of neutron stars, the SEXTANT experiment is focused on observations of pulsars. Radiation emanating from their powerful magnetic fields is swept around much like a lighthouse. The narrow beams are seen as flashes of light when they sweep across our line of sight. With these predictable pulsations, pulsars can provide high-precision timing information similar to the atomic-clock signals supplied through the GPS system.

Veteran’s Day Demonstration
In the SEXTANT demonstration that occurred over the Veteran’s Day holiday in 2017, the SEXTANT team selected four millisecond pulsar targets — J0218+4232, B1821-24, J0030+0451, and J0437-4715 — and directed NICER to orient itself so it could detect X-rays within their sweeping beams of light. The millisecond pulsars used by SEXTANT are so stable that their pulse arrival times can be predicted to accuracies of microseconds for years into the future.

During the two-day experiment, the payload generated 78 measurements to get timing data, which the SEXTANT experiment fed into its specially developed onboard algorithms to autonomously stitch together a navigational solution that revealed the location of NICER in its orbit around Earth as a space station payload. The team compared that solution against location data gathered by NICER’s onboard GPS receiver.

“For the onboard measurements to be meaningful, we needed to develop a model that predicted the arrival times using ground-based observations provided by our collaborators at radio telescopes around the world,” said Paul Ray, a SEXTANT co-investigator with the U. S. Naval Research Laboratory. “The difference between the measurement and the model prediction is what gives us our navigation information.”

The goal was to demonstrate that the system could locate NICER within a 10-mile radius as the space station sped around Earth at slightly more than 17,500 mph. Within eight hours of starting the experiment on November 9, the system converged on a location within the targeted range of 10 miles and remained well below that threshold for the rest of the experiment, Mitchell said. In fact, “a good portion” of the data showed positions that were accurate to within three miles. 

“This was much faster than the two weeks we allotted for the experiment,” said SEXTANT System Architect Luke Winternitz, who works at Goddard. “We had indications that our system would work, but the weekend experiment finally demonstrated the system’s ability to work autonomously.”

Although the ubiquitously used GPS system is accurate to within a few feet for Earth-bound users, this level of accuracy is not necessary when navigating to the far reaches of the solar system where distances between objects measure in the millions of miles. “In deep space, we hope to reach accuracies in the hundreds of feet,” Mitchell said.

Next Steps and the Future

Now that the team has demonstrated the system, Winternitz said the team will focus on updating and fine-tuning both flight and ground software in preparation for a second experiment later in 2018. The ultimate goal, which may take years to realize, would be to develop detectors and other hardware to make pulsar-based navigation readily available on future spacecraft. To advance the technology for operational use, teams will focus on reducing the size, weight, and power requirements and improving the sensitivity of the instruments. The SEXTANT team now also is discussing the possible application of X-ray navigation to support human spaceflight, Mitchell added.

If an interplanetary mission to the moons of Jupiter or Saturn were equipped with such a navigational device, for example, it would be able to calculate its location autonomously, for long periods of time without communicating with Earth.

Mitchell said that GPS is not an option for these far-flung missions because its signal weakens quickly as one travels beyond the GPS satellite network around Earth.

“This successful demonstration firmly establishes the viability of X-ray pulsar navigation as a new autonomous navigation capability. We have shown that a mature version of this technology could enhance deep-space exploration anywhere within the solar system and beyond,” Mitchell said. “It is an awesome technology first.”

NICER is an Astrophysics Mission of Opportunity within NASA's Explorers program, which provides frequent flight opportunities for world-class scientific investigations from space utilizing innovative, streamlined and efficient management approaches within the heliophysics and astrophysics science areas. NASA's Space Technology Mission Directorate funds the SEXTANT component of the mission through its Game Changing Development Program.

Related Links:
NASA's NICER mission website
More information on SEXTANT
Download NICER-SEXTANT multimedia resources



By Lori Keesey and Clare Skelly
Goddard Space Flight Center




_______________________________________
Mac
Equipe administration.

Avant de poster sur le forum, merci de lire le règlement et de passer par la case présentation.
Ma présentation est par ici.
Vous pouvez également consulter notre blog ou témoigner d'une observation.

Quand j'exprime mes idées personnelles, j'écris en noir, quand j'avertis, j'écris en vert et quand je modère, j'écris en rouge.
Voir le sujet précédentRevenir en hautVoir le sujet suivant
Permission de ce forum:
Vous ne pouvez pas répondre aux sujets dans ce forum