[특허]Multipath noise reduction for spread spectrum signals

Multipath noise reduction for spread spectrum signals 원문보기

IPC분류정보
국가/구분	United States(US) Patent 등록
국제특허분류(IPC7판)	H04L-027/30
출원번호	US-0039783 (1993-03-17)
발명자 / 주소	Meehan Thomas K. (Glendale CA)
출원인 / 주소	The United States of America as represented by the Administrator of the National Aeronautics and Space Administration (Washington DC 06)
인용정보	피인용 횟수 : 196 인용 특허 : 0

초록 ▼

The invention includes the concepts of early-prompt delay tracking, multipath correction of early-prompt delay tracking from correlation shape and carrier phase multipath correction. In early-prompt delay tracking, since multipath is always delayed with respect to the direct signals, the system derives phase and pseudorange observables from earlier correlation lags. In multipath correction of early-prompt delay tracking from correlation shape, the system looks for relative variations of amplitude across the code correlation function that do not match the predicted multipath-free code cross-correlation shape. The system then uses deviations from the multipath-free shape to infer the magnitude of multipath, and to generate corrections pseudorange observables. In carrier phase multipath correction, the system looks for variations of phase among plural early and prompt lags. The system uses the measured phase variations, along with the general principle that the multipath errors are larger for later lags, to infer the presence of multipath, and to generate corrections for carrier-phase observables.

대표청구항 ▼

In a receiver for receiving an incoming signal consisting of a carrier tone modulated by a spread spectrum code sequence, the receiver being of the type which generates a local model of the carrier tone and a local model of the code sequence, apparatus for measuring multipath distortion, comprising: means for generating plural versions of said model code sequence delayed by respective multiples of a predetermined delay time; means for generating plural product signals by a multiplication of said incoming signal by one of (a) said model carrier tone and (b) a respective one of said plural model code versions, and then multiplying the result of said multiplication by the other of (a) and (b); correlator means for computing respective cross-correlation functions from respective ones of said plural product signals; and measuring means for computing an error corresponding to a deviation from a predetermined relationship among said respective cross-correlation functions, and for outputting said error as a measurement of multipath distortion in said incoming signal.

이 특허를 인용한 특허 (196)

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Kohli, Sanjai; Chen, Steven; Cahn, Charles R.; Chansarkar, Mangesh; Turetsky, Greg, Spread spectrum receiver with multi-bit correlator.
상세보기
Sanjai Kohli ; Steven Chen ; Charles R. Cahn ; Mangesh Chansarkar ; Greg Turetsky, Spread spectrum receiver with multi-bit correlator.
상세보기
Cahn Charles R. ; Kohli Sanjai, Spread spectrum receiver with multi-path cancellation.
상세보기
Cahn Charles R. ; Chansarkar Mangesh ; Kohli Sanjai, Spread spectrum receiver with multi-path correction.
상세보기
Cahn, Charles R.; Chansarkar, Mangesh; Kohli, Sanjai, Spread spectrum receiver with multi-path correction.
상세보기
Lomp, Gary; Kowalski, John; Ozluturk, Fatih; Silverberg, Avi; Regis, Robert; Luddy, Michael; Marra, Alexander; Jacques, Alexander, Spread spectrum system assigning information signals to message-code signals.
상세보기
Lomp, Gary; Kowalski, John; Ozluturk, Fatih; Silverberg, Avi; Regis, Robert; Luddy, Michael; Marra, Alexander; Jacques, Alexander, Spread-spectrum system for assigning information signals having different data rates.
상세보기
Norman Charles P. ; Cahn Charles R., Strong signal cancellation to enhance processing of weak spread spectrum signal.
상세보기
Norman,Charles P.; Cahn,Charles R., Strong signal cancellation to enhance processing of weak spread spectrum signal.
상세보기
Ozluturk, Fatih M.; Lomp, Gary R., Subscriber unit for controlling initial power ramp-up using short codes.
상세보기
Ozluturk, Fatih M.; Lomp, Gary R., Subscriber unit for controlling initial power ramp-up using short codes.
상세보기
Ozluturk, Fatih M.; Lomp, Gary R., Subscriber unit for performing an access procedure.
상세보기
Pon Rayman, Suppression of multipath signal effects.
상세보기
Pon Rayman, Suppression on multipath signal effects.
상세보기
Brown, Jim; Zhang, Gengsheng; Garin, Lionel, Synchronizing a radio network with end user radio terminals.
상세보기
Underbrink, Paul A.; Gronemyer, Steven A., System and method for despreading in a spread spectrum matched filter.
상세보기
Underbrink, Paul A.; Gronemyer, Steven A., System and method for despreading in a spread spectrum matched filter.
상세보기
Kumar Derek D., System and method for multiplexing a spread spectrum communication system.
상세보기
Chang, Steve; Pande, Ashutosh; Garin, Lionel Jacques; Chadha, Kanwar; Peng, Leon Kuo-Liang; Zhang, Gengsheng; Vantalon, Nicolas Patrick; Turetzky, Gregory, System and method for providing location based services over a network.
상세보기
Ozluturk,Fatih M.; Lomp,Gary R., System for using rapid acquisition spreading codes for spread-spectrum communications.
상세보기
Lomp, Gary; Ozluturk, Fatih; Silverberg, Avi, Traffic lights in a code division multiple access (CDMA) modem.
상세보기
Lomp, Gary; Ozluturk, Fatih; Silverberg, Avi, Transferring voice and non-voice data.
상세보기
Pon Rayman ; Martin Kreg ; Farmer Dominic, Variable suppression of multipath signal effects.
상세보기
Pon Rayman W. ; Farmer Dominic G., Weighted carrier phase multipath reduction.
상세보기
Pon, Rayman W., Wide correlated optimized code multipath reduction.
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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

내보내기 구분	파일저장 인쇄 메일전송
구성항목	기본정보 상세정보 관리번호, 국가코드, 자료구분, 상태, 출원번호, 출원일자, 공개번호, 공개일자, 등록번호, 등록일자, 발명명칭(한글), 발명명칭(영문), 출원인(한글), 출원인(영문), 출원인코드, 대표IPC 관리번호, 국가코드, 자료구분, 상태, 출원번호, 출원일자, 공개번호, 공개일자, 공고번호, 공고일자, 등록번호, 등록일자, 발명명칭(한글), 발명명칭(영문), 출원인(한글), 출원인(영문), 출원인코드, 대표출원인, 출원인국적, 출원인주소, 발명자, 발명자E, 발명자코드, 발명자주소, 발명자 우편번호, 발명자국적, 대표IPC, IPC코드, 요약, 미국특허분류, 대리인주소, 대리인코드, 대리인(한글), 대리인(영문), 국제공개일자, 국제공개번호, 국제출원일자, 국제출원번호, 우선권, 우선권주장일, 우선권국가, 우선권출원번호, 원출원일자, 원출원번호, 지정국, Citing Patents, Cited Patents
저장형식	Text(ASCII format) Excel format PIAS분석(.xls)
메일정보	받는사람 (필수) @ 보내는사람 (선택) @ 제목 내용 KISTI 검색결과 이메일 서비스
안내	총 건의 자료가 검색되었습니다. 다운받으실 자료의 인덱스를 입력하세요. (1-10,000) 검색결과의 순서대로 최대 10,000건 까지 다운로드가 가능합니다. 데이타가 많을 경우 속도가 느려질 수 있습니다.(최대 2~3분 소요) 다운로드 파일은 UTF-8 형태로 저장됩니다. 파일의 내용이 제대로 보이지 않을실 때는 웹브라우저 상단의 보기 -> 인코딩 -> 자동선택 여부를 확인하십시오. ~ Text(ASCII format) Excel format

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Multipath noise reduction for spread spectrum signals 원문보기

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Multipath noise reduction for spread spectrum signals 원문보기

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