Importance

Loading Importance Indicators...

Abstract

A telecommunications satellite channeliser (170) is provided for mapping RF signals between feeder links (160-162) and mobile link beams (210-212) based on a predefined frequency plan (FIGS. 7 and 8). The mobile link beams (240) define a coverage area (242) of a satellite (10). Each feeder link and mobile link beam comprises a plurality of feeder subbands and mobile subbands grouped to form feeder link channels (216-238) and mobile link channels (244-255). The channeliser (170) includes at least one feeder lead carrying a feeder link signal (160-162) associated with a ground station (14 and 16). A feeder link distribution network (175) is connected to the feeder leads and maps RF signals in the feeder links (160-162) onto a plurality of distribution leads as divided feeder signals. Channel multiplexers (182-184) are connected to the distribution leads. Each channel multiplexer (182) includes a set of band pass filters (190-201), each of which passes RF signals in a subset of feeder subbands corresponding to a single feeder channel in order to map a mobile link channel (244) and a feeder link channel (216) onto one another based on a predefined frequency plan. The channeliser (170) groups or multiplexes signals from a plurality of feeders into each beam. Fixed local oscillator up converters shift each composite mobile channel to a common band allocated to all beams. The frequency plan is defined such that beam handovers and ground station handovers may be performed without a need for at least one of switching, retuning and resynchronization of the telecommunications satellite and the mobile terminal.

Loading the Abstract Image...

First Claim