[특허]Global positioning system digital receiver

Global positioning system digital receiver 원문보기

IPC분류정보
국가/구분	United States(US) Patent 등록
국제특허분류(IPC7판)	H03D-003/02 H04L-027/06
출원번호	US-0636168 (1990-12-31)
발명자 / 주소	Kennedy Howard L. (Phoenix AZ) King Thomas M. (Tempe AZ)
출원인 / 주소	Motorola, Inc. (Schaumburg IL 02)
인용정보	피인용 횟수 : 76 인용 특허 : 0

초록 ▼

A digital GPS (Global Positioning System) receiver for receiving a plurality of coded satellite signals. The plurality of satellite signals are transmitted by a corresponding plurality of satellites. Since these satellites are moving rapidly with respect to the receiver, Doppler shifting of the signals is exhibited. The signals are converted from analog to digital at intermediate frequency levels. The signals are then separated simultaneously into a plurality of digital signals corresponding to I and Q channel information for each transmitting satellite. A processor then converts these I and Q channel information signals to pseudo-range and broadcast data for navigation and time purposes.

대표청구항 ▼

A digital Global Positioning System (GPS) receiver for receiving a plurality of coded satellite signals from a plurality of satellites, said signals exhibiting Doppler shifting, said receiver comprising: means for down converting said coded satellite signals to intermediate frequency signals; said means for down converting including: antenna means for receiving said coded satellite signals; mixer means connected to said antenna means, said mixer means for converting said coded satellite signals of a particular frequency to said intermediate frequency signals; phase lock loop means connected to said mixer means, said phase lock loop means for providing a phase correcting voltage signal representing the phase error between a scaled frequency of a voltage controlled oscillator stable and a reference oscillator signal; and voltage controlled oscillator means operating at L-band and operating in response to the phase correcting voltage signal of said phase lock loop means to produce a first mixer signal, said voltage controlled oscillator means being connected to said phase lock loop means; and said phase lock loop means for providing a second mixer signal; A/D means coupled to said means for converting, said A/D means for simultaneously translating said intermediate frequency signals for said plurality of coded satellite signals to a plurality of digital signals; correlation means coupled to said A/D means, said correlation means for simultaneously separating each of said plurality of digital signals corresponding to each said satellite to provide “I”and “Q”channel information signals; processor means coupled to said correlation means, said processor means for retrieving information transmitted from each of said satellites in response to said “I”and “Q”channel information signals.

이 특허를 인용한 특허 (76)

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Abraham, Charles; Fuchs, Donald L., Method and apparatus for performing signal correlation at multiple resolutions to mitigate multipath interference.
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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

Global positioning system digital receiver 원문보기

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Global positioning system digital receiver 원문보기

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이 특허를 인용한 특허 (76)

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