[특허]Geodetic surveying system using multiple GPS base stations

Geodetic surveying system using multiple GPS base stations 원문보기

IPC분류정보
국가/구분	United States(US) Patent 등록
국제특허분류(IPC7판)	G01S-005/02 H04B-007/185
출원번호	US-0598389 (1990-10-15)
발명자 / 주소	Spradley Jr. Lewis H. (Houston TX) Wincelowicz Jr. John P. (Houston TX) Spradley David H. (Houston TX)
출원인 / 주소	GPS Technology Corp. (Houston TX 02)
인용정보	피인용 횟수 : 122 인용 특허 : 0

초록 ▼

An improved system and method for determining a position fix in space and time using the Global Positioning System (GPS) satellite network signals. The system comprises at least three fixed base stations each having a satellite receiver operating in conjunction with a highly accurate (atomic-standard) clock. Each base station\s position is known with great accuracy. GPS satellite signals are collected over statistically significant periods of time at each base station and fitted to determine with the clock offset and drift of the station clocks, thus establishing a “network”of base station clocks that in the aggregate is of great accuracy and precision. An arbitrary number of mobile receiver stations similarly collect data for working periods of statistically significant duration; these data are used in conjunction with the base station data to compute position fixes for the mobile stations.

대표청구항 ▼

A method for determining the position coordinates of a GPS satellite receiver of unknown position, referred to as a mobile receiver, with respect to the earth\s surface, comprising the steps of: (a) accumulating code signals and carrier-phase signals broadcast by four or more GPS satellites, said accumulation taking place simultaneously at: (1) at least three geographically dispersed fixed reference station receivers, referred to as base station receivers, each having: (A) a set of position coordinates known to the order of 10 cm with respect to the other base station receivers, and (B) a clock having a direct measured time differential with respect to the clocks of the other base station receivers and an estimated time differential with respect to an absolute time reference, and (2) the mobile receiver; (b) computing an initial estimate of a set of maximum-likelihood position coordinates of the mobile receiver; (c) noise-filtering the accumulated code signals, utilizing information derived from the accumulated carrier-phase signals; (d) correcting the initial position estimate with a correction for timing, refraction, and geometric error, said correction simultaneously minimizing the sum of squares of the difference between: (1) the corrected initial position estimate, and (2) a set of three or more independent differential position estimates of the mobile receiver, each differential position estimate being computed as a function of the differences in reception times of said satellite signals at a specified base station receiver and at the mobile receiver.

이 특허를 인용한 특허 (122)

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IPC	Description
A	생활필수품
A62	인명구조; 소방(사다리 E06C)
A62B	인명구조용의 기구, 장치 또는 방법(특히 의료용에 사용되는 밸브 A61M 39/00; 특히 물에서 쓰이는 인명구조 장치 또는 방법 B63C 9/00; 잠수장비 B63C 11/00; 특히 항공기에 쓰는 것, 예. 낙하산, 투출좌석 B64D; 특히 광산에서 쓰이는 구조장치 E21F 11/00)
A62B-1/08	.. 윈치 또는 풀리에 제동기구가 있는 것

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연합인증

Geodetic surveying system using multiple GPS base stations 원문보기

초록 ▼

대표청구항 ▼

연구과제 타임라인

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Geodetic surveying system using multiple GPS base stations 원문보기

초록 ▼

대표청구항 ▼

연구과제 타임라인

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