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A satellite communication system (100) includes a satellite (102) in a predefined orbit projecting a plurality of beams (1-48) designating a coverage area (115). The satellite (102) has a communication device (200), a frequency synthesizer (222) for setting a frequency of the communication device fo

A satellite communication system (100) includes a satellite (102) in a predefined orbit projecting a plurality of beams (1-48) designating a coverage area (115). The satellite (102) has a communication device (200), a frequency synthesizer (222) for setting a frequency of the communication device for communicating via a beam of the plurality of beams (1-48) and a controller (216) coupled to the frequency synthesizer (222) for compensating for a Doppler frequency shift associated with the beam.

대표청구항 ▼

A satellite communication system, comprising: at least one satellite in a predefined elliptical orbit projecting a beam designating a coverage area, the at least one satellite, comprising: a radio communication device; a frequency synthesizer for setting a frequency of the radio communication device

A satellite communication system, comprising: at least one satellite in a predefined elliptical orbit projecting a beam designating a coverage area, the at least one satellite, comprising: a radio communication device; a frequency synthesizer for setting a frequency of the radio communication device; and a controller, coupled to the frequency synthesizer, for compensating for a Doppler frequency shift associated with the beam, wherein the controller generates a plurality of Doppler compensation values at a plurality of predetermined points that are time dependent on the elliptical orbit and wherein the controller calculates path delays associated with the plurality of predetermined points; a determinator determines a maximum path delay; and the controller applies an equalizing delay equal to a path delay summing the path delay with a result of the maximum path delay minus the path delay associated with a current predetermined point.