Abstract: The invention relates in particular to a TDMA transmission system including transmitters synchronized to a single receiver, each of the transmitters being able to transmit to the receiver on a given carrier frequency bursts with lengths which are all multiples of that of a unit burst including a guard time, the unit bursts including at least one guard time and the receiver being adapted to receive simultaneously bursts from different transmitters. According to the invention, each transmitter includes means for inserting a filler sequence into each burst to be transmitted at each location of the burst that is likely to correspond to a guard time in a burst received simultaneously on a different carrier frequency. The invention reduces the harmful effects of interference if the time of reception of the guard time of a burst on a first carrier frequency corresponds to the time of reception of information symbols in another burst received simultaneously on another carrier frequency.

Abstract: A method of locating a fixed terminal of a telecommunication system comprising a constellation of satellites, a plurality of gateway stations and a plurality of fixed terminals includes “coarse”, “intermediate” and “fine” location phases. During the “intermediate” location phase, the terminal calculates at least three hyperboloids and their intersection, assuming a “coarse” estimated position of the terminal is known. Each hyperboloid can be written: Hi,j:dj−di=(tj′−tj).c−(ti′−ti).