Acquisition system for the SDMA/TDMA satellite communication sys

Details Acquisition system for the SDMA/TDMA satellite communication sys Acquisition system for the SDMA/TDMA satellite communication sys

1975-02-21

1976-05-18

Morrison, Malcolm A.

Telegraphy

Systems

Line-clearing and circuit maintenance

179 15BS, 325 4, 325 58, H04J 306, H04B 720

Patent

active

039580830

ABSTRACT:
An acquisition system for the SDMA/TDMA satellite communication system is disclosed in which a synchronization signal receiving time slot and a plurality of data signal receiving time slots, for communication between predetermined groups of earth stations and between the earth stations of each group, are sequentially provided at the satellite based on timing signal in the satellite. An acquisition signal having a plurality of signal burst portions is transmitted from the earth station, with its transmit time slot being shifted in a first sweep mode until one part of the acquisition signal is received by said transmitting earth station. At that time the transmit time slot is shifted in a second sweep mode, whereby a control is made to obtain synchronization of the earth station with the satellite so that the plurality of burst portions in the acquisition signal may be properly communicated to the predetermined groups.
Further, an acquisition control is shown to be effectively achieved in the case where the SN ratio of the received acquisition signal is extremely deteriorated or where it is necessary to prevent disturbing another earth station of the same group of earth stations which has already accessed the satellite.

REFERENCES:
patent: 3530252 (1970-09-01), Puente
patent: 3562432 (1971-02-01), Gabbard
patent: 3566268 (1971-02-01), Webb
patent: 3812430 (1974-05-01), Schmidt et al.
patent: 3813496 (1974-05-01), Maillet
patent: 3879580 (1975-04-01), Schlosser et al.

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