[특허]Pseudorandom noise ranging receiver which compensates for multipath distortion by dynamically adjusting the time delay s

Pseudorandom noise ranging receiver which compensates for multipath distortion by dynamically adjusting the time delay s 원문보기

IPC분류정보
국가/구분	United States(US) Patent 등록
국제특허분류(IPC7판)	G01S-005/02 H04B-007/185
출원번호	US-0217768 (1994-03-24)
발명자 / 주소	Fenton Patrick (Calgary CA CAX) Van Dierendonck Albert J. (Los Altos CA)
출원인 / 주소	NovAtel Communications Ltd. (CAX 03)
인용정보	피인용 횟수 : 160 인용 특허 : 0

초록 ▼

A receiver for pseudorandom noise (PRN) encoded signals consisting of a sampling circuit, multiple carrier and code synchronizing circuits, and multiple digital autocorrelators. The sampling circuit provides digital samples of a received composite signal to each of the several receiver channel circuits. The synchronizing circuits are preferably non-coherent, in the sense that they track any phase shifts in the received signal and adjust the frequency and phase of a locally generated carrier reference signal accordingly, even in the presence of Doppler or ionospheric distortion. The autocorrelators in each channel form a delay lock loop (DLL) which correlates the digital samples of the composite signal with locally generated PRN code values to produce a plurality of (early, late), or (punctual, early-minus-late) correlation signals. Thus, during an initial acquisition mode, the delay spacing is relatively wide, on the order of approximately one PRN code chip time. However, once PRN code synchronism has been achieved, the code delay spacing is narrowed, to a fraction of a PRN code chip time. There are several advantages to this arrangement, especially in environments wherein multipath distortion in the received composite signal is of the same order of magnitude as a PRN code chip time.

대표청구항 ▼

A receiver for demodulating and decoding a composite radio frequency (RF) signal consisting of a plurality of transmitted pseudorandom noise (PRN) encoded signals comprising: an RF downconverter, connected to receive the composite RF signal and to provide a composite intermediate frequency (IF) signal; means for generating a local sample clock signal; a sampling circuit, connected to receive the composite IF signal and the local sample clock signal, and to provide digital in-phase (I) samples and quadrature (Q) samples of the composite IF signal; a plurality of channel circuits, each channel circuit for demodulating and decoding one of the transmitted PRN encoded signals, and connected in parallel with the other channel circuits such that the each channel circuit receives the I samples and Q samples at the same time as the other channel circuits, wherein each channel circuit further comprises: a PRN code signal generator, connected to receive a synchronizing adjustment signal and to provide a local reference PRN code signal; means for decoding the I and Q sample signals, connected to receive the I samples, the Q samples, and the local reference PRN code signal, the decoding means for multiplying the I and Q samples by the local reference PRN code signal, and providing decoded I and Q samples; and autocorrelation means, connected to receive the decoded I and Q samples, for determining the autocorrelation power level at a first and second code phase delay, and for providing the synchronizing adjustment signal to the PRN code generator by comparing the autocorrelation power levels at the first and second phase delays, the first and second phase delays being dynamically narrowed by being set to a predetermined wide correlator delay during an initial acquisition period, and thereafter set to a predetermined narrow correlator delay.

이 특허를 인용한 특허 (160)

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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
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Pseudorandom noise ranging receiver which compensates for multipath distortion by dynamically adjusting the time delay s 원문보기

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Pseudorandom noise ranging receiver which compensates for multipath distortion by dynamically adjusting the time delay s 원문보기

초록 ▼

대표청구항 ▼

연구과제 타임라인

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