Platform transmitter terminal (PTT) for use with an ARGOS type satellite system and utilizing a solar array/rechargeable battery power source
Intermittently driven transmitter
Telecommunications satellite system on quasi-stationary orbits
Earth-fixed cell beam management for satellite communication system
Satellite and terrestrial telephone Patent #: 5586165
ApplicationNo. 409808 filed on 03/24/1995
US Classes:455/13.4, Power control342/356, Synchronous satellite455/428, Switching or routing455/430Ground station control
ExaminersPrimary: Urban, Edward F.
Attorney, Agent or Firm
International ClassH04B 007/185
AbstractAn elliptical satellite system which carries out communication. The satellite orbits a height above the earth less than that necessary for geosynchronous orbits. When the satellite is near the apogee portion of its orbit, its velocity approximates the rotational velocity of the earth, and during that period it appears to hover over the earth. Each ground station on the earth always communicates with a satellite within a predetermined position of its apogee, and hence that satellite appears to the ground station to hover over the earth. The satellite hence does not communicate with any earth station when it is outside of that apogee portion. During the times when the satellite is outside the apogee portion, its communication is therefore shut off to prevent any possibility of interfering with geosynchronous satellites. During this time, the power supply on the satellite is also used to charge a battery on the satellite. This enables the power supply to be made smaller by an amount equivalent to the duty cycle of the satellite: during the time which it is on.