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Delta differential one-way ranging(delta-DOR) [:] For certain mission applications, especially targeting a landing site, it is also important to know the spacecraft position in the plane of the sky, which cannot be computed from the line-of-sight ranging data. Another method is needed to address this gap. This is differential one-way ranging(known as delta-DOR), a navigation capability that also benefits RS [radio science] in that the experiments data quality improves from optimizing the navigation solution. Delta-DOR is derived from the more general VLBI [very long baseline interferometric] measurements where two or more tracking stations on different continents are used to determine the position and velocity of the spacecraft in the plane of the sky.  1, fiche 1, Anglais, - delta%20differential%20one%2Dway%20ranging

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"Δ" is the mathematical symbol for "delta."  3, fiche 1, Anglais, - delta%20differential%20one%2Dway%20ranging

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delta differential one-way ranging; delta-differential one-way ranging; delta-DOR; delta differential one-way range; ΔDOR: designations validated by a Canadian subject-matter expert from the NASA Jet Propulsion Laboratory, California Institute of Technology.  5, fiche 1, Anglais, - delta%20differential%20one%2Dway%20ranging

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technique différentielle de distance par triangulation; delta-DOR : désignations validées par un spécialiste canadien du NASA Jet Propulsion Laboratory, California Institute of Technology.  2, fiche 1, Français, - technique%20diff%C3%A9rentielle%20de%20distance%20par%20triangulation

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... a new algorithm, CHIRP(continuous high-resolution image reconstruction using patch priors)... takes a Bayesian approach and novel formulation to solve the ill-posed inverse problem of image reconstruction from [very long baseline interferometry(VLBI) ] measurements.  2, fiche 2, Anglais, - CHIRP%20algorithm

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[La chercheuse] découvre l'image du trou noir, en train d'être reconstituée grâce à l'algorithme CHIRP («continuous high-resolution image reconstruction using patch priors») qu'elle a inventé.  1, fiche 2, Français, - algorithme%20CHIRP

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HALCA was launched by M-V-1 on February 12, 1997. As a radio astronomy satellite, it conducted various engineering experiments including deployment of large antenna and VLBI(very long baseline interferometry) interference experiments before successfully making VLBI observation.  2, fiche 3, Anglais, - radio%20astronomy%20satellite

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Lancement du satellite de radioastronomie HALCA à la rampe de lancement de Kagoshima, au Japon. Les signaux transmis par le satellite japonais sont fusionnés à ceux transmis par les radiotélescopes du réseau mondial d'interférométrie à très longue base (VLBI). Les astronomes utilisent un système informatique appelé «corrélateur» [...]  2, fiche 3, Français, - satellite%20de%20radioastronomie

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Determining the Earth's motion with reference to distant astronomical bodies(quasars) is principally achieved through Very Large Base Interferometry(VLBI) techniques based on simultaneous observation of quasi-stellar sources by an international network of radioastronomy observatories.... Obviously, the motions of the Earth's interior cannot be measured directly and must be deduced from the analysis of surface deformations combined with high-precision space-based measurements of the Earth's gravity and magnetic fields.  2, fiche 4, Anglais, - very%20large%20base%20interferometry

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L'IERS [Service International de la Rotation Terrestre], créé en 1988, a pour principaux objectifs la rotation terrestre et la maintenance des systèmes de référence terrestre et céleste associés à partir de programmes permanents d'observation de précision centimétrique : radiointerférométrie à longue base (VLBI), télémétrie par laser sur la Lune et sur satellites artificiels (LLR, SLR), Global Positioning System (GPS), ainsi que le programme DORIS du CNES [Centre National d'Études Spatiales].  2, fiche 4, Français, - radiointerf%C3%A9rom%C3%A9trie%20%C3%A0%20tr%C3%A8s%20grande%20base

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U. S. Space VLBI [Very Long Baseline Interferometry] Project/Radioastron Support Instrumentation Requirements Document(SIRD).  2, fiche 5, Anglais, - support%20instrumentation%20requirements%20document

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The superluminal radio source in the gamma-ray blazar 3C 279... One of the greatest surprises provided by very-long baseline interferometry(VLBI) observations was the fact that some quasars, radiogalaxies, and BL Lacertae objects exhibit motion along their jets which works out to several times faster than light. Motion of material at such velocities is forbidden by relativity... but relativity also provides a way in which we can see such blobs appear to move faster than light(that is, superluminally).... they are bright because of Doppler boosting, and there also seems to be a connection between strong gamma-ray emission and superluminal radio structure.  2, fiche 6, Anglais, - superluminal%20radio%20source

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Radiosource dont la vitesse apparente est supérieure à celle de la lumière.  1, fiche 6, Français, - radiosource%20supraluminique

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The QUASAT(an acronym for QUAsar SATellite) was a joint NASA-ESA Project intended to put a 12-meter antenna into a low Earth orbit to do VLBI(Very Large Baseline Interferometry) from both space and the ground at the same time.  1, fiche 7, Anglais, - quasar%20satellite

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Deux projets futuristes restent à l'étude : le projet Quasat proposé par la NASA et l'ESA et le projet Radioastron des Russes, qui font tous deux appel à la mise en place d'une antenne en orbite terrestre réalisant une interférométrie avec les antennes sur Terre. Enfin, dans le futur, il n'est pas exclu de voir un jour la mise en place d'un gigantesque interféromètre constitué d'antennes de plusieurs diamètre en orbite dans l'espace.  1, fiche 7, Français, - projet%20Quasat

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Some applications for a space-qualified hydrogen maser clock are : spacecraft tracking, navigation, time transfer, space-based VLBI(Very Long Baseline Interferometry), gravitation and relativity experiments.  3, fiche 8, Anglais, - hydrogen%20maser%20clock

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VLBI : very long baseline interferometry.  2, fiche 9, Anglais, - Canadian%20transportable%20VLBI%20antenna

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Source(s) : Levés géodésiques Canada.  1, fiche 9, Français, - antenne%20canadienne%20transportable%20de%20RILB

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RILB : radiointerférométrie à très longue base.  2, fiche 9, Français, - antenne%20canadienne%20transportable%20de%20RILB

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VLBI : Very Long Baseline Interferometry.  1, fiche 10, Anglais, - International%20VLBI%20Service

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IVS is an international collaboration of organizations which operate or support Very Long Baseline Interferometry(VLBI) components. IVS provides a service which supports geodetic and astrometric work on reference systems, Earth science research, and operational activities.  1, fiche 10, Anglais, - International%20VLBI%20Service

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Radiointerférométrie à très longue base.  1, fiche 10, Français, - Service%20international%20de%20RILB

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