Satellite communications system and apparatus
Patent 4455651 Issued on June 19, 1984. Estimated Expiration Date: 
June 19, 2001. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
June 19, 2001. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent References 3596002 3761813 Method and apparatus for transmitting messages to and from remote locations Position determining apparatus and method Processor for multiple, continuous, spread spectrum signals Ground station antenna for satellite communication systems Spread spectrum communications method and apparatus Correlation system for global position receiver Patent #: 4426712 InventorAssigneeApplicationNo. 06/198296 filed on 10/20/1980US Classes:370/320, Code division (CDMA)342/352, Including a satellite342/356, Synchronous satellite375/142, Having correlation-type receiver455/13.1With plural repeater or relay systemsExaminersPrimary: Brigance, Gerald L.Attorney, Agent or FirmInternational ClassesH04B 7/204 (20060101)H04B 7/216 (20060101) AbstractA satellite communications system, which is inherently power limited, employing spread spectrum techniques in order to trade-off bandwidth for small ground station antennas. In a one-way system embodiment a central station transmits data to a satellite for relay to a large number of small antenna receiving stations, the transmissions being spread spectrum encoded with spreading code lengths selected to provide adequate data recovery at the least sensitive station to which the transmissions are directed. Spreading codes may also function to address particular stations. In a two-way system embodiment, the central station additionally functions as a terrestrial relay station. A plurality of small antenna transmitting stations, at least one of which may be at the same site as a receiving station, transmit code division multiplexed data via the satellite to the central relay station using sufficiently long and distinct spreading codes as to permit adequate data error rates and to distinguish the transmissions of the various stations. The central relay station reformats the received data for retransmission to the satellite for relay to the receiving stations.Other References
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