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CRITICAL SUBSYSTEM [4 records]

Record 1 2017-02-13

English

Subject field(s)
  • Spacecraft
CONT

We present the modification of two ESA [European Space Agency] ground stations carried out in order to support the in-flight RF [Radio Frequency] validation of the Proximity Communication Equipment(PCE), part of the International Space Station(ISS). This subsystem plays a critical role during the docking of the Automated Transfer Vehicle(ATV), and has to be tested prior to each ATV launch, to ensure that the RF performance is as expected. For the check-out, an unmodulated signal is transmitted by the PCE during an ISS pass, and received by the two ground stations. Based on the strength of the received signal, the radiation characteristic of the complete PCE can be assessed, and compared with the nominal performance. The measurement process requires calibrating the receiving subsystem, including antenna, front-end and back-end equipment. The adopted calibration procedure, only relying on radio stars measurement, does not require the use of a calibrated source external to the ground station.

French

Domaine(s)
  • Engins spatiaux
CONT

Le système de communications PCE (Proximity Communication Equipment) a été développé et intégré à Toulouse par EADS [European Aeronautic Defence Space] Astrium, dans le cadre du programme ATV [véhicule de transfert automatique] de l'Agence Spatiale Européenne, sous responsabilité d'EADS SPACE Transportation qui est le maître d'œuvre du développement et de la construction du segment spatial de l'ATV. Le PCE est destiné à assurer les communications de proximité pour les 30 derniers kilomètres de vol du futur véhicule cargo européen ATV à son approche de la Station spatiale internationale (ISS). [...] Le PCE est un sous-ensemble intégré. Il est constitué de deux chaînes de communications en bande S, entièrement redondantes. Il comprend deux transpondeurs à spectre étalé, deux équipements de gestion de protocoles CCSDS [Consultative Committee for Space Data Systems] et des équipements radio fréquence. Le PCE sera installé dans le module Zvezda de l'ISS et sera opérationnel durant la phase dite «de proximité» correspondant aux 30 derniers kilomètres du vol ATV et à l'exercice délicat de son arrimage à la Station. Ce rendez-vous orbital automatique représentera une première européenne. Parmi l'ensemble des données de commande et de contrôle qu'il transmettra dans le cadre de sa mission de communications, le PCE fournira à l'ATV les informations de position GPS [système mondial de localization] nécessaires à la navigation relative vers la Station spatiale internationale (ISS). À une distance de 500 m et jusqu'à l'arrimage, la navigation se poursuivra à l'aide d'instruments laser, d'abord avec un télégoniomètre puis avec un vidéomètre pour les phases finales.

Spanish

Save record 1

Record 2 2007-07-25

English

Subject field(s)
  • Spacecraft
CONT

The major objective of this contract is to design a monopropellant propulsion system, which is a mission critical subsystem of the satellite Guidance and Navigation Control System.

Key term(s)
  • critical sub-system

French

Domaine(s)
  • Engins spatiaux

Spanish

Save record 2

Record 3 2002-06-25

English

Subject field(s)
  • Spacecraft
CONT

Optical Head(OH). The OH is typically located outside the spacecraft and performs the critical functions of generating and pointing the transmit laser beam and acquiring and tracking the received beacon and receive laser beams. Major elements of the OH are :-Coarse pointing assembly used for steering the terminal line of sight.-Optical subsystem comprising telescope, optical bench and beacon collimator.-Fine pointing assembly(FPA) : This is a mechanism used in conjunction with the tracking sensor to provide the tracking function for the terminal.-Point ahead assembly(PAA) : This is similar to the FPA and is used to introduce the required point ahead offset to the transmit beam.-Acquisition sensor(AS) : This is a wide field of view sensor used during acquisition for the identification and location of the partner terminal.-Tracking sensor(TS) : This is a fast sensor that operates in a closed loop with the FPA.

French

Domaine(s)
  • Engins spatiaux

Spanish

Save record 3

Record 4 - external organization data 1994-12-12

English

Subject field(s)
  • Nuclear Science and Technology
  • Nuclear Fission Reactors
  • Compartment - Canadian Nuclear Safety Commission
CONT

... failure to close of the containment isolation devices associated with a single containment subsystem for the subsystem most critical for radioactive releases from containment....

French

Domaine(s)
  • Sciences et techniques nucléaires
  • Réacteurs nucléaires de fission
  • Tiroir - Commission canadienne de sûreté nucléaire
CONT

[...] défaillance des dispositifs d'isolement du confinement associés à un seul sous-système de confinement pour le sous-système le plus critique quant aux émissions radioactives provenant du confinement à se fermer [...]

Spanish

Save record 4

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