Communications: directive radio wave systems and devices (e.g. – Directive – Including a satellite
Patent
1996-10-24
2000-02-01
Tarcza, Thomas
Communications: directive radio wave systems and devices (e.g.,
Directive
Including a satellite
342357, 455 121, 455 131, 701213, G01S 502
Patent
active
060208457
ABSTRACT:
An existing TDRSS satellite communication system is incorporated, together with low-power ground-based remote transceivers of special design, and additional beamforming and steering elements at the ground terminals, to make possible digital communication between low power field transceivers and satellite ground terminals. The satellite communication system transmits to its ground terminals a composite signal, comprising amplified, phase-coherent signals received by an array of broad-coverage antennas on the satellite. The field transceiver transmits a pseudonoise coded signal spread across all or a portion of the satellite's receive bandwidth. At the ground terminals, the downlinked composite signal is processed by a beamformer to define a narrow, high-gain beam between the satellite and low-power transceiver. Signal processing gain and beamformer gain in combination serve to elevate the received, demodulated signals well above the noise level at the receiver. Through this invention, a large multiplicity of non-interfering reverse-link (remote-to-central) communication channels may be supported by a host satellite communication system of the nature described. By the introduction of forward link signal channels into the satellite ground terminal, and scheduling of forward link transmissions to the set of low-power remote transceivers along with normal transmit activities, highly useful two-way communication can be extended to a class of users not initially served by the satellite communication system.
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Bolton et al., Spacelab--Its Command and Data Management Role in the Space Transportation System, IEEE Transactions on Communications, vol. COM-26, No. 11, Nov. 1978, pp. 1568-1583, see entire document.*
Cunningham Kenneth
Weinberg Aaron
Phan Dao L.
Stanford Telecommunications, Inc.
Tarcza Thomas
Zegeer, Esq. Jim
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