Method for recovering from sun transit in communication of very

Details Method for recovering from sun transit in communication of very Method for recovering from sun transit in communication of very

1995-06-05

1997-08-19

Olms, Douglas W.

Telecommunications

Receiver or analog modulated signal frequency converter

Signal selection based on frequency

455 121, 342352, H04B 7185

Patent

active

056594879

ABSTRACT:
A method for recovering from a sun transit in a communication of a very small aperture terminal (VSAT) is disclosed, in which the sun transit outrage (STO) is prevented by using a sun transit recovering algorithm, thereby making it possible to apply the very small aperture terminal (VSAT) to the satellite communication. Generally, the communication system of the very small aperture terminal (VSAT) in which a still track satellite is used includes a VSAT central station (VCS), a network management system (NMS), and a VSAT remote station (VRS). In this communication system, when the sun reaches near the boresight axis of an antenna, an STO phenomenon occurs, with the result that the communication system is influenced by the additional noise power of the sun. Consequently, the reliability of the communication system drops to below an average quality which is tolerable in an antenna communication system. Particularly, in a communication system using a still track satellite, the STO phenomenon occurs once every day near the spring equinox and the autumnal equinox, and therefore, problems are encountered in carrying out the communications. The present invention provides a method for recovering from a sun transit in a communication of a very small aperture terminal, in which, when an STO phenomenon occurs in the communication system, this is predicted by a network management system (NMS), and is informed to the VCS and to the VRS, so that the communication can be halted during the occurrence of an STO phenomenon, and that the communication can be resumed after the termination of the STO phenomenon.

REFERENCES:
patent: 3836969 (1974-09-01), Bond et al.
patent: 5271039 (1993-12-01), Suzuki
patent: 5379320 (1995-01-01), Fernandes et al.
David P. O'Neil, "The rapid deployment digital satellite network," IEEE Comm. Mag, vol. 30, No. 1, pp. 30-35 Jan. 1992.
Klaus G. Johannsen, "Combatting sun outage in satellite television distribution systems," IEEE Trans. on Broadcasting, vol. 34, No. 1, pp. 18-23 Mar. 1988.

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