TERMIUM Plus^®

Record 1,  Textual support,  English

Record number: 1, Textual support number: 1 CONT

... gyros and accelerometers have an offset, known as bias. The gyro bias for instance, shows itself after integration as an angular drift, increasing rise linearly over time(ramp)... To compensate for sensor drift, a process called augmentation is used, whereby gyro and acceleration errors are compensated by utilising other system states. For instance the angular drift error of a gyro after integration can be compensated, if true angular measurements are taken. Comparing the two shows then the gyro drift. Assuming that inertial systems are generally operated around an equilibrium position and thus linear acceleration integrates to zero over time, then attitude can be processed via gravitational acceleration, thus giving true angular measurements to compensate gyro drift.  1, record 1, English, - angular%20drift

Record 1,  Textual support,  French

Record number: 1, Textual support number: 1 CONT

[...] il est possible de réaliser des capteurs gyrométriques dont les performances sont caractérisées par une erreur de facteur d'échelle pouvant être inférieure à 10^-6, une dérive angulaire de l'ordre de quelques millièmes de degré par heure, pendant quelques heures, un domaine de mesure pouvant dépasser 360 degrés par seconde. Ces caractéristiques ont notamment autorisé la réalisation de navigateurs inertiels (sans plate-forme stabilisée) destinés aux avions civils et militaires ainsi qu'à des lanceurs spatiaux comme Ariane IV et V.  1, record 1, French, - d%C3%A9rive%20angulaire

Record 1,  Textual support,  Spanish

Record 2,  Textual support,  English

Record number: 2, Textual support number: 1 CONT

The ISS attitude will vary between +15 degrees and-15 degrees for each roll and yaw axis of LVLH [Local Vertical/Local Horizontal] and between +15 degrees to-20 degrees for the pitch axis... At any point on the ISS non-articulated portion, which means the portion excluding rotating elements such as photovoltaic arrays and Thermal Control System(TCS) radiators, the ISS will provide estimates of the ISS LVLH attitude to an accuracy of 3 degrees per axis(3 sigma) and inertial rates to an accuracy of 0. 01 degrees per second per axis(3 sigma). When controlling to the TEA [Torque Equilibrium Attitude] with non-propulsive effectors, the ISS will maintain attitude stability to 3. 5 degrees per axis per orbit.  2, record 2, English, - ISS%20attitude

Record number: 2, Textual support number: 1 OBS

ISS attitude: term officially approved by the International Space Station official approval Group (ISSOAG).  3, record 2, English, - ISS%20attitude

Record 2,  Textual support,  French

Record number: 2, Textual support number: 1 OBS

attitude de la Station spatiale : terme uniformisé par le Groupe de travail de la terminologie de la Station spatiale internationale (GTTSSI).  2, record 2, French, - attitude%20de%20la%20Station%20spatiale

Record 2,  Textual support,  Spanish

Record 3,  Textual support,  English

Record number: 3, Textual support number: 1 CONT

The calculations for the ISS [International Space Station] quasi-steady acceleration environment can be compared to a set of formal design requirements which state that 50 percent of the ISPR [International Standard Payload Rack] locations within the U.S. Lab, Columbus and the JEM must have quasi-steady accelerations below 1 ug for periods of 30 continuous days a total of 6 times per year. The operation of the Station in Microgravity Mode is designed to produce these 30 day intervals. The quasi-steady acceleration vector has an additional directional stability requirement stating that the component perpendicular to the vector’s orbital average must be less than or equal to 0.2 [mu] g. To meet this requirement the Station’s attitude must be controlled during orbit so that it maintains a constant position relative to the LVLH [Local Vertical/Local Horizontal] axes.  2, record 3, English, - quasi%2Dsteady%20acceleration%20environment

Record number: 3, Textual support number: 2 CONT

The quasi-steady state acceleration level is determined primarily by the combined effects of atmospheric drag(due to the finite residual Earth's atmosphere at the orbital altitude of the ISS), and gravity gradient stabilisation of the ISS. Gravity gradient stabilisation uses the principle that a body in orbit around the Earth will tend to rotate about it's centre of mass, as each part of the body will tend to follow it's own orbit. It will normally oscillate about a mean orientation, but will eventually remain in a stable orientation with respect to the Earth. The normal orientation for the ISS is the Torque Equilibrium Attitude discussed earlier. The resultant combination of atmospheric drag, gravity gradient and other secondary effects produce a set of gravity contours(i. e., locations of equal gravity level) which define the quasi-steady state microgravity environment of the ISS.  3, record 3, English, - quasi%2Dsteady%20acceleration%20environment

Record number: 3, Textual support number: 1 OBS

quasi-steady acceleration environment: term officially approved by the International Space Station official approval Group (ISSOAG).  4, record 3, English, - quasi%2Dsteady%20acceleration%20environment

Record 3,  Textual support,  French

Record number: 3, Textual support number: 1 OBS

Les modèles d'analyse dynamique (DAC 8) pour l'ISS [International Space Station] prévoient un environnement caractérisé par des vibrations de l'ordre du milli-g (10-4 g) plutôt que des conditions de véritable microgravité (10-6 g) en raison des activités et des divers éléments de l'ISS qui causent des vibrations intempestives (gigue gravitationnelle). Les travaux antérieurs menés à bord de la navette et de Mir ont montré que le milieu est caractérisé par des vibrations aléatoires continues, orientées dans tous les sens, avec des accélérations de l'ordre du milli-g et des crêtes dépassant souvent les 10 milli-g.  2, record 3, French, - milieu%20gravitationnel%20quasi%20stable

Record number: 3, Textual support number: 2 OBS

milieu gravitationnel quasi stable : terme uniformisé par le Groupe de travail de la terminologie de la Station spatiale internationale (GTTSSI).  3, record 3, French, - milieu%20gravitationnel%20quasi%20stable

Record 3,  Textual support,  Spanish

Record 4,  Textual support,  English

Record number: 4, Textual support number: 1 CONT

The Local Vertical Local Horizontal coordinate system is referenced to the near-circular orbital plane. In order to specify the attitude of the Station with respect to the Local Vertical Local Horizontal, a system based on Eulerian angles of roll, pitch and yaw is used.  3, record 4, English, - local%20vertical%20local%20horizontal

Record number: 4, Textual support number: 2 CONT

The ISS [International Space Station] flies in an attitude that is referenced to the orbital plane of ISS using a set of local vertical/local-horizontal axes. The origin is at the ISS centre of mass, with the x-axis pointing along the direction of the orbital velocity vector(sometimes referred to as the "ram" direction). The z-axis points directly towards the Earth, and the y-axis parallel to the truss assembly... This orientation is referred to as "x-axis toward the velocity vector" Torque Equilibrium Attitude and is the "normal" orientation of the ISS. The overall ISS design is optimised to fly in this attitude, which places the most laboratory modules in the "best" microgravity volume, supports attitude reboosts, service vehicle docking and minimises aerodynamic drag.  3, record 4, English, - local%20vertical%20local%20horizontal

Record number: 4, Textual support number: 1 OBS

local vertical local horizontal; LVLH: term and abbreviation officially approved by the International Space Station official approval Group (ISSOAG).  4, record 4, English, - local%20vertical%20local%20horizontal

Record 4,  Textual support,  French

Record number: 4, Textual support number: 1 OBS

local vertical local horizontal; LVLH : terme et abréviation uniformisés par le Groupe de travail de la terminologie de la Station spatiale internationale (GTTSSI).  2, record 4, French, - local%20vertical%20local%20horizontal

Record 4,  Textual support,  Spanish

Record 5,  Textual support,  English

Record number: 5, Textual support number: 1 CONT

... The ISS [International Space Station] will be "flying" at what we call a Torque Equilibrium Attitude(TEA). A TEA just means that all of the external torques(like aerodynamic drag and gravity) on the ISS [International Space Station] are balanced, and the ISS doesn’t need to fire thrusters to remain in attitude.  2, record 5, English, - torque%20equilibrium%20attitude

Record number: 5, Textual support number: 2 CONT

The ISS [International Space Station] flies in an attitude that is referenced to the orbital plane of ISS using a set of local vertical/local-horizontal axes. The origin is at the ISS centre of mass, with the x-axis pointing along the direction of the orbital velocity vector(sometimes referred to as the "ram" direction). The z-axis points directly towards the Earth, and the y-axis parallel to the truss assembly... This orientation is referred to as "x-axis toward the velocity vector" Torque Equilibrium Attitude and is the "normal" orientation of the ISS.  3, record 5, English, - torque%20equilibrium%20attitude

Record number: 5, Textual support number: 1 OBS

torque equilibrium attitude; TEA : term and abbreviation officially approved by the International Space Station official approval Group(ISSOAG).  4, record 5, English, - torque%20equilibrium%20attitude

Record 5,  Textual support,  French

Record number: 5, Textual support number: 1 OBS

stabilisation dynamique de l'attitude; TEA : terme et abréviation uniformisés par le Groupe de travail de la terminologie de la Station spatiale internationale (GTTSSI).  3, record 5, French, - stabilisation%20dynamique%20de%20l%27attitude

Record 5,  Textual support,  Spanish

Record 6,  Textual support,  English

Record 6,  Textual support,  French

Record number: 6, Textual support number: 1 OBS

terme d'usage obligatoire au Bureau des Traductions.  2, record 6, French, - attitude%20d%27%C3%A9quilibre

Record 6,  Textual support,  Spanish