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X/Y ORIENTATION [4 fiches]

Fiche 1 2010-12-02

Anglais

Subject field(s)
  • Flight Instruments and Equipment (Aeroindustry)
  • Aircraft Piloting and Navigation
  • Navigation Instruments
CONT

The gyros are used to maintain the platform's inertial orientation by sensing rotations of the platform caused by vehicle-rotation-induced friction at the gimbal pivot points... One gyro-called the vertical gyro-is oriented so its input axes are aligned with the X and Y platform axes; its input axes provide IMU [Inertial Measurement Unit] platform roll and pitch stabilization. The second gyro is oriented so that one input axis lies along the platform's Z axis and the other lies in the X-Y plane. This gyro-the azimuth gyro-provides platform yaw stabilization with the Z input axis, while the second input axis is used as a platform rate detector for built-in test equipment.

CONT

The sensors for angular velocity are vibrating gyroscopes (3 axes, to detect rotation and pitch/roll pendulations of the payload). An error signal is obtained differencing the signal from the azimuth gyroscope and a constant level settable from the telemetry, which controls the speed of rotation. Such error signal drives an analog PID [Proportional Integral Differential] circuit; the output of the PID is connected to the PWM [Pulse Width Modulation] driver supplying current to the pivot azimuth motors.

CONT

azimuth gyro: term used at Natural Resources Canada - Earth Sciences Sector.

PHR

Azimuth gyro drift rate.

Français

Domaine(s)
  • Instruments et équipement de bord (Constructions aéronautiques)
  • Pilotage et navigation aérienne
  • Instruments de navigation
CONT

La plate-forme stabilisée [...] Trois gyroscopes sont utilisés : (a) Un gyroscope d'azimut qui, n'ayant aucun degré de liberté dans l'axe vertical, détecte tout déplacement de la plate-forme en azimut. (b) Deux gyroscopes d'inclinaison [...]

OBS

gyroscope d'azimut : terme en usage à Ressources naturelles Canada - Secteur des sciences de la Terre.

PHR

Vitesse de dérive du gyroscope d'azimut.

Espagnol

Conserver la fiche 1

Fiche 2 - données d’organisme externe 2009-07-30

Anglais

Subject field(s)
  • Compartment - ISO/IEC JTC 1 Information Technology Vocabulary
Universal entry(ies)
06.01.92 (19762)
numéro d'article de norme ISO/CEI
DEF

polarization of a propagating wave is determined by the locus or path described by the electric field vector with respect to time

OBS

Polarization is a term that often arises in the literature and when considering radio frequency communication and RFID. If we ascribe an x, y, z co-ordinate system to a propagating wave as illustrated below, with the direction of propagation being in the z direction, the electric field vector E will be in the x, y plane. If E remains in the same orientation with respect to time, so that its locus describes a straight line, the wave is said to be linearly polarized. However, if the locus describes a circular motion with respect to time the wave is said to be circularly polarized. Where the locus describes an elliptical path, the wave is said to be elliptically polarized.

OBS

Circular polarization is often used in communication systems since the orientation of the transmitting and receiving antenna is less important than it is with linearly polarized waves. The magnetic vector, H, always remains perpendicular to the E vector. Using an IEEE convention, a clockwise circular rotating wavefront approaching a receiver is defined as being left-hand circular (LHC) polarized. The power in the wavefront is expressed in the form of the Poynting vector, P: P = (E x H) = E x H sin ..., where ... is the phase angle between E and H.

OBS

polarization summary: term and definition standardized by ISO/IEC [ISO/IEC 19762-4:2008].

Français

Espagnol

Conserver la fiche 2

Fiche 3 - données d’organisme externe 2009-07-30

Anglais

Subject field(s)
  • Compartment - ISO/IEC JTC 1 Information Technology Vocabulary
Universal entry(ies)
06.01.93 (19762)
numéro d'article de norme ISO/CEI
DEF

orientation of the tag relative to the reader antennas, in terms of the variation of the tag's x, y and z positions

OBS

alignment: term and definition standardized by ISO/IEC [ISO/IEC 19762-4:2008].

Français

Espagnol

Conserver la fiche 3

Fiche 4 1996-06-11

Anglais

Subject field(s)
  • Simulation (Cybernetic Systems)
DEF

Assignment of orientation(yaw, pitch) and position coordinates(x, y, z) to digital sounds assigned to data.

Français

Domaine(s)
  • Simulation (Systèmes cybernétiques)
DEF

Attribution de coordonnées d'orientation (roulis et tangage) et de position (x,y,z) aux sons numériques correspondant aux données.

Espagnol

Conserver la fiche 4

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