[특허]Ambiguity resolution for ambiguous position solutions using satellite beams

[미국특허] Ambiguity resolution for ambiguous position solutions using satellite beams 원문보기

IPC분류정보
국가/구분	United States(US) Patent 등록
국제특허분류(IPC7판)	G01S-005/02 H04B-071/85
출원번호	US-0723723 (1996-09-30)
발명자 / 주소	Victor Edward B.
출원인 / 주소	Qualcomm Incorporated
대리인 / 주소	Miller
인용정보	피인용 횟수 : 90 인용 특허 : 8

초록 ▼

A system and method for resolving ambiguity in an ambiguous position solution for a user terminal position in a satellite communications system which includes a user terminal, at least one satellite, and a gateway communicating with the user terminal through the satellite. Each satellite has a plurality of satellite beams which each illuminate a region on the Earth in a known pattern relative to a satellite sub-track. A satellite beam illuminating the user terminal is identified along with its corresponding position relative to the sub-track. The orientations of possible user terminal positions and the identified beam relative to the satellite sub-track are compared to each other. Possible user terminal positions falling on an incorrect side of the sub-track from the detected beam illuminating the user terminal, are considered as incorrect solutions for that user terminal. The ambiguity solution can be determined using satellite identification and comparison elements in the user terminal, or at the gateway, in which case certain beam information is reported to the gateway. In further aspects of the invention, the beam being identified can be either a forward link or reverse link beam, or both, and each link has a different beam pattern.

대표청구항 ▼

[ What I claim as the invention is:] [9.] In a communications system comprising a user terminal, at least one satellite, and a gateway for communicating with the user terminal through the satellite and determining a plurality of possible positions of the user terminal on the Earth's surface, each satellite having a first plurality of satellite beams for forward link communications and a second plurality of beams for reverse link communications each communicating with a region of the Earth's surface in a known pattern relative to a satellite sub-track, the beam pattern of each plurality differing from that of the other, a method for resolving ambiguity in the position of the user terminal on the Earth's surface, comprising the steps of:identifying a first beam of said first plurality of satellite beams which is illuminating the user terminal on said forward link and a first corresponding side of a satellite sub-track said first beam is positioned on;identifying a second beam of said second plurality of satellite beams which is communicating with said user terminal on said reverse link and a second corresponding side of a satellite sub-track said second beam is positioned on; andcomparing the plurality of possible positions with the said determined first and second sub-track sides for said identified satellite beams to select one of the plurality of possible positions based on the result of said comparison.

이 특허에 인용된 특허 (8) 인용/피인용 타임라인 분석

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[미국특허] Ambiguity resolution for ambiguous position solutions using satellite beams 원문보기

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