Method and apparatus for determining characteristics of...

H - Electricity – 04 – B

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H04B 17/00 (2006.01) H04B 7/185 (2006.01)

Patent

CA 2315065

For determining characteristics of components of a communication channel, for example of a transponder in a communication satellite, a clean carrier signal f(t) is modulated with a pseudo noise signal PN(t) and transmitted through the communication channel at a level below the level of a payload signal which is transmitted via the communication channel simultaneously. The received signal s'(t) is correlated with same pseudo noise signal PN(t) to obtain a recovered carrier signal f'(t). Both the clean carrier signal f(t) and the recovered carrier signal f'(t) can be used to determine the desired characteristics. Since the PN modulated clean carrier signal s(t) is transmitted at a low level, it is possible to perform measurements without switching off the payload signal.

Pour déterminer les caractéristiques de constituants d'une voie de communication, par exemple d'un transpondeur dans un satellite de communication, un signal multiplex f(t) indépendant est modulé avec un signal de pseudo-bruit PB(t) et transmis par la voie de communication à un niveau inférieur au niveau d'un signal de charge utile qui est transmis simultanément par la voie de communication. Le signal reçu s'(t) est mis en corrélation avec le même signal de pseudo-bruit PB(t) pour produire un signal multiplex récupéré f'(t). Le signal multiplex indépendant f(t) et le signal multiplex récupéré f'(t) peuvent tous deux être utilisés pour déterminer les caractéristiques désirées. Etant donné que le signal multiplex indépendant s(t) modulé PB est transmis à un faible niveau, il est possible d'effectuer des mesures sans interrompre le signal de charge utile.

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