Alcatel Espace

Pascal Triaud

Jean-Luc Foucher

Dominique Rousselet

Emile Tonello

Christian Noguera

Patrick Michau

Marc Atge

A satellite transponder has the local oscillator in the receiver slaved to a quartz crystal oscillator by a narrowband phase-locked loop during a standby period or in the absence of received signal and by a wideband phase-locked loop immediately the signal is received, at which time the narrowband phase-locked loop is switched out automatically.

Satellite transponder able to use same frequency scheme for transmitter

A Costas loop carrier recovery device with particular application to communications with spacecraft includes a voltage-controlled oscillator. Two filters having different characteristics are connected to the oscillator by a loop filter via two circuits:

Costas loop carrier recovery device

A phase loop demodulator, in particular for space telecommunications, comprises a primary phase loop, a locking detector circuit responsive to acquisition by the primary loop, and a secondary phase loop controlled by said detector circuit.

Growing community of inventors

Tournefeuille, France

Pascal Triaud