TERMIUM Plus^®

Record 1,  Textual support,  English

Record number: 1, Textual support number: 1 CONT

A large variety of inertial navigation system configurations have been developed... Analysis of these systems indicates that they all have the same basic error characteristics, that is, random gyro drift, accelerometer bias and scale factor errors, alignment error, etc., and they affect all systems in a similar manner.  3, record 1, English, - random%20gyro%20drift

Record 1,  Textual support,  French

Record number: 1, Textual support number: 1 CONT

[...] la dérive «au sens strict» (dérive aléatoire [...]); il faut entendre par là qu'une telle dérive, due essentiellement à un phénomène inconnu, ne peut être compensée (autrement dit, toutes les compensations envisageables ont été effectuées).  4, record 1, French, - d%C3%A9rive%20al%C3%A9atoire%20des%20gyroscopes

Record number: 1, Textual support number: 2 CONT

Dans le cadre du suivi en orbite des satellites orbite basse d'observation de la terre, il est nécessaire de mettre au point un outil de suivi et de caractérisation de la dérive aléatoire des gyroscopes utilisés par le pilotage. Cet outil doit permettre d'évaluer la santé des équipements concernés, et d'anticiper d'éventuels problèmes en orbite.  1, record 1, French, - d%C3%A9rive%20al%C3%A9atoire%20des%20gyroscopes

Record 1,  Textual support,  Spanish

Record 2,  Textual support,  English

Record number: 2, Textual support number: 1 CONT

A large variety of inertial navigation system configurations have been developed recently. Analysis of these systems indicates that they all have the same basic error characteristics, that is, random gyro drift, accelerometer bias and scale factor errors, alignment error, etc., and they affect all systems in a similar manner.  2, record 2, English, - alignment%20error

Record number: 2, Textual support number: 2 CONT

The alignment error signal whether it be manually inserted, stored information or magnetic information, is fed from the MAN/STORE/MAG switch, on the controller to the heading card in the EU [electronic unit]. During both rapid alignment and main alignment, an amber warning light, part of the auto align pushbutton, lights to warn the operator that either rapid or main align is in progress.  3, record 2, English, - alignment%20error

Record 2,  Textual support,  French

Record number: 2, Textual support number: 1 CONT

Le signal d'erreur d'alignement, qu'il soit introduit manuellement, mis en mémoire ou de nature magnétique, est envoyé hors du contrôleur, à partir du sélecteur MAN/STORE/MAG jusqu'à la carte de cap. Durant l'alignement rapide et l'alignement principal, une lampe d'avertissement de couleur jaune, qui fait partie [intégrante] du bouton-poussoir AUTO ALIGN, s'allume pour avertir le pilote ou le technicien que soit l'alignement rapide soit l'alignement principal est en cours.  1, record 2, French, - erreur%20d%27alignement

Record 2,  Textual support,  Spanish

Record 3,  Textual support,  English

Record number: 3, Textual support number: 1 CONT

... for a mechanically dithered RLG [ring laser gyro], non-linearities(sidebands) appear in the input-output scale factor curve for an input rotation rate which is a harmonic of the dither frequency... There are two disadvantages to dithering. One is that the rotation rate periodically passes through zero where lock-in occurs. This results in a "random walk" angular position error. The other is that the vibration of the gyro body may affect other components or the gyro may be affected by other vibration sources. The laser gyro need not be mechanically dithered. The same result may be achieved by optical devices.  1, record 3, English, - mechanically%20dithered%20RLG

Record number: 3, Textual support number: 1 OBS

dither: To periodically tilt from side to side.  4, record 3, English, - mechanically%20dithered%20RLG

Record 3,  Textual support,  French

Record 3,  Textual support,  Spanish

Record 4,  Textual support,  English

Record number: 4, Textual support number: 1 CONT

Gyro Scale Factor Error : This is an indication of the angular error which occurs during rotation. E. g. with 300 ppm scale factor error(=0. 03%) the angular error is in the area of 0. 1 degree after one revolution.  2, record 4, English, - scale%20factor%20error

Record number: 4, Textual support number: 2 CONT

A gyro’s accuracy and performance can be judged by its output errors; for rate sensors the most important are: bias; scale factor error; noise... The scale factor error is the linear deviation of the measured rate from the true rate (normally given as a percentage of full scale).  3, record 4, English, - scale%20factor%20error

Record 4,  Textual support,  French

Record number: 4, Textual support number: 1 CONT

Les erreurs de mesure des gyromètres laser peuvent être représentées par des modèles mathématiques beaucoup plus simples que ceux intervenant dans l'étude des gyromètres classiques. Cela résulte essentiellement de l'insensibilité des gyromètres laser aux accélérations. La description de l'erreur d'un gyromètre laser fait intervenir : a) une erreur de zéro [...] b) une erreur imputable au blocage [...] c) une erreur de facteur d'échelle, beaucoup plus faible que dans le cas des gyromètres mécaniques, due à une stabilité imparfaite des propriétés physiques des éléments de l'appareil.  1, record 4, French, - erreur%20de%20facteur%20d%27%C3%A9chelle

Record 4,  Textual support,  Spanish

Record 5,  Textual support,  English

Record number: 5, Textual support number: 1 CONT

... for a mechanically dithered RLG [ring laser gyro], non-linearities(sidebands) appear in the input-output scale factor curve for an input rotation rate which is a harmonic of the dither frequency... There are two disadvantages to dithering. One is that the rotation rate periodically passes through zero where lock-in occurs. This results in a "random walk" angular position error. The other is that the vibration of the gyro body may affect other components or the gyro may be affected by other vibration sources. The laser gyro need not be mechanically dithered. The same result may be achieved by optical devices.  1, record 5, English, - mechanically%20dithered

Record number: 5, Textual support number: 1 OBS

dither: To periodically tilt from side to side.  2, record 5, English, - mechanically%20dithered

Record 5,  Textual support,  French

Record 5,  Textual support,  Spanish

Record 6,  Textual support,  English

Record number: 6, Textual support number: 1 DEF

The accelerometer output with no input acceleration present.  3, record 6, English, - accelerometer%20bias

Record number: 6, Textual support number: 1 CONT

A large variety of inertial navigation system configurations have been developed recently. Analysis of these systems indicates that they all have the same basic error characteristics, that is, random gyro drift, accelerometer bias and scale factor errors, alignment error, etc., and they affect all systems in a similar manner.  1, record 6, English, - accelerometer%20bias

Record number: 6, Textual support number: 1 OBS

Bias is a signed quantity usually expressed in units of acceleration.  3, record 6, English, - accelerometer%20bias

Record 6,  Textual support,  French

Record number: 6, Textual support number: 1 DEF

biais (accéléromètre). Valeur indiquée par un accéléromètre en l'absence d'accélération.  2, record 6, French, - biais%20de%20l%27acc%C3%A9l%C3%A9rom%C3%A8tre

Record number: 6, Textual support number: 1 CONT

Équation d'erreurs. En pratique, l'accéléromètre et le gyroscope sont sujets à des erreurs. On peut modéliser le signal qu'il fournissent par : [formule xxx] où k_a et k_g sont les facteurs d'échelle de l'accéléromètre et du gyroscope, b est le biais de l'accéléromètre, [thêta] est la dérive du gyroscope.  1, record 6, French, - biais%20de%20l%27acc%C3%A9l%C3%A9rom%C3%A8tre

Record 6,  Textual support,  Spanish