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FREQUENCY DIVERSITY [7 records]

Filter results by subject field Alphabetical list of terms

Filter results by subject field

Alphabetical list of terms

Record 1 2023-05-02

English

Subject field(s)
  • Telecommunications
  • Radio Transmission and Reception
  • Electronic Warfare
DEF

The capability of a device to use multiple transmitted frequencies either at the same instant or in sequence within a coherent processing interval.

OBS

Frequency diversity is normally used to avoid jamming or detection as well as to improve target detection.

OBS

frequency diversity : designation and definition officially approved by the Joint Terminology Panel.

French

Domaine(s)
  • Télécommunications
  • Émission et réception radio
  • Guerre électronique
DEF

Capacité d'un dispositif à utiliser de multiples fréquences transmises simultanément ou séquentiellement dans un intervalle de traitement cohérent.

OBS

La diversité de fréquence sert normalement à éviter le brouillage ou la détection et à améliorer la détection des cibles.

OBS

diversité de fréquence : désignation et définition uniformisées par le Groupe d'experts en terminologie interarmées.

Spanish

Campo(s) temático(s)
  • Telecomunicaciones
  • Radiotransmisión y radiorrecepción
  • Guerra electrónica
DEF

Método de transmisión y recepción en el cual la misma señal de información es transmitida y recibida simultáneamente en dos o más frecuencias.

Key term(s)
  • explotación con diversidad de frecuencia
  • diversidad de frecuencia de operación
Save record 1

Record 2 2016-04-07

English

Subject field(s)
  • Destructive and Non-destructive Tests (Mat.)
  • Acoustics (Physics)
CONT

The power of the acoustic emission testing is in the diversity of the parameters of the recorded signal(amplitude, energy, frequency, etc.), and in the methods developed to process them. It is the combination of these parameters and the use of statistical data processing techniques such as the neural networks, which lead to the establishment of an accurate diagnosis on the damage state.

French

Domaine(s)
  • Contrôle destructif et non destructif (Matér.)
  • Acoustique (Physique)
CONT

La puissance du contrôle par émission acoustique réside dans la diversité des paramètres du signal enregistré (amplitude, énergie, fréquence, etc.), et dans les moyens développés pour les traiter. C'est la combinaison de ces paramètres et l'exploitation des techniques de [traitement statistique] de données, tels que les réseaux de neurones, qui conduisent à l'établissement d'un diagnostic précis sur l'état de l'endommagement.

Spanish

Save record 2

Record 3 2010-11-17

English

Subject field(s)
  • Telecommunications
  • Radar, Radio Guidance and Goniometry
DEF

The reduction in predetection signal-to-interference energy ratio required to achieve a given level of performance relative to that of a nondiversity radar, resulting from the use of diversity in frequency, polarization, space, or other characteristics.

French

Domaine(s)
  • Télécommunications
  • Radar, radioguidage et radiogoniométrie
DEF

Différence entre l'amplitude du signal le plus fort reçu dans une station de réception en diversité et l'amplitude du signal le plus faible.

Spanish

Campo(s) temático(s)
  • Telecomunicaciones
  • Guía radárica, radioguía y radiogoniometría
DEF

Ganancia que se obtiene con un sistema en diversidad en la recepción al utilizar dos o más antenas.

Save record 3

Record 4 2003-07-21

English

Subject field(s)
  • Satellite Telecommunications
CONT

Bandwidth Spreading : Signal Spreading works quite well in situations with strong narrow band interference signals since the SS signal has a unique form of frequency diversity. The actual signal spreading may be achieved with one of three basic techniques. These include direct sequence, frequency hopped and pulsed FM or hybrid forms.

French

Domaine(s)
  • Télécommunications par satellite

Spanish

Save record 4

Record 5 2003-06-25

English

Subject field(s)
  • Radio Waves
DEF

A frequency diversity in which the two radio frequencies used are in two frequency bands.

OBS

Used only when the band is too congested for the assignment of a second frequency in the same band.

French

Domaine(s)
  • Ondes radioélectriques

Spanish

Save record 5

Record 6 1998-08-13

English

Subject field(s)
  • Radio Transmission and Reception
  • Radar, Radio Guidance and Goniometry
DEF

An antenna capable of producing multiple beams in order to provide either space diversity, polarization diversity or variable-shaped beams.

OBS

In satellite communications, space diversity allows for users geographically separated to reuse the same frequency band by accessing the satellite through a different antenna beam; polarization diversity allows the same frequency band to be reused by employing orthogonal polarizations. In a variable-shaped multibeam antenna, the beams are interconnected to a single common part. A receive-only earth station antenna may also be a multibeam antenna in order to accommodate satellites in the orbital arc.

Key term(s)
  • multi-beam antenna

French

Domaine(s)
  • Émission et réception radio
  • Radar, radioguidage et radiogoniométrie
DEF

Antenne à plusieurs accès indépendants, ayant simultanément plusieurs diagrammes de rayonnement différents, chaque diagramme correspondant à un accès.

Key term(s)
  • antenne multipinceaux

Spanish

Save record 6

Record 7 1981-08-28

English

Subject field(s)
  • Telephony and Microwave Technology
OBS

It is also noted that the compression/expansion control signal is transmitted via two FSK channels in parallel to provide in-band frequency diversity and thus a higher degree of reliability.

French

Domaine(s)
  • Téléphonie et techniques hyperfréquences
OBS

On note aussi que le signal de commande de compression/extension est transmis par deux voies MDF en parallèle, de façon à permettre la diversité de fréquence dans la bande et donc une plus grande fiabilité.

Spanish

Save record 7

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