Satellite relay system
First Claim
1. A TDMA satellite relay system comprising:
- a power divider means having a single input and n output terminals where n is an integer, said power divider means receiving a TDMA input signal having a plurality of non-overlapped burst signals relating to a different earth station and distributing the power in said inut signal to each of said output terminals,n phase shifters, each coupled to a corresponding output of said power divider,n power amplifiers, each coupled to a corresponding output of said phase shifters,a 2n-port directional coupler means consisting of n number of input terminals, each coupled to a corresponding power amplifier, n number of output terminals, and a plurality of couplers between said input terminals and said output terminals wherein the input power of any one of the input terminals is equally distributed to all the output terminals,n number of transmission antennas, each coupled to a corresponding output of said 2n-port directional coupler means, and each antenna having a narrow spot beam covering a single specific earth station with no overlap therebetween, anda phaseshifter control for controlling said phase shifters such that each burst signal in the TDMA signal is connected to a corresponding antenna on a time divisional basis through said 2n-port directional coupler means wherein said phase shifter control synchronizes said phase shifters with said burst signal.
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Abstract
A satellite relay system for Time Division Multiple Access (TDMA) utilizing a beam scanning technique has been found. According to the present invention a plurality of antennas each relating to the corresponding earth station have a narrow spot beam with sharp directivity. Each of the up-link bursts (a signal from an earth station to a satellite) is simply combined, and a single-channel TDMA signal is obtained. Said TDMA signal is then divided into a plurality of signals by a power divider after frequency conversion. Each of said signals is processed by a variable phase shifter, the output of which is applied to a power amplifier. A 2n-port directional coupler having n number of input terminals and n number of output terminals is provided and each of said input terminals is connected to the output of the corresponding power amplifier. Each of the output signals of the 2n-port directional coupler provides a down-link burst and is connected to the corresponding transmission antenna which has a sharp directivity covering only a single specific earth station. The 2n-port directional coupler is composed of a plurality of couplers or hybrid circuits.
31 Citations
7 Claims
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1. A TDMA satellite relay system comprising:
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a power divider means having a single input and n output terminals where n is an integer, said power divider means receiving a TDMA input signal having a plurality of non-overlapped burst signals relating to a different earth station and distributing the power in said inut signal to each of said output terminals, n phase shifters, each coupled to a corresponding output of said power divider, n power amplifiers, each coupled to a corresponding output of said phase shifters, a 2n-port directional coupler means consisting of n number of input terminals, each coupled to a corresponding power amplifier, n number of output terminals, and a plurality of couplers between said input terminals and said output terminals wherein the input power of any one of the input terminals is equally distributed to all the output terminals, n number of transmission antennas, each coupled to a corresponding output of said 2n-port directional coupler means, and each antenna having a narrow spot beam covering a single specific earth station with no overlap therebetween, and a phaseshifter control for controlling said phase shifters such that each burst signal in the TDMA signal is connected to a corresponding antenna on a time divisional basis through said 2n-port directional coupler means wherein said phase shifter control synchronizes said phase shifters with said burst signal. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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Specification