[특허]Differential phase measurement through antenna multiplexing

Differential phase measurement through antenna multiplexing 원문보기

IPC분류정보
국가/구분	United States(US) Patent 등록
국제특허분류(IPC7판)	G01S-005/02
출원번호	US-0957271 (1992-10-06)
발명자 / 주소	Dentinger Michael P. (Los Altos CA) Cohen Clark E. (Palo Alto CA)
출원인 / 주소	Trimble Navigation Limited (Sunnyvale CA 02)
인용정보	피인용 횟수 : 99 인용 특허 : 0

초록 ▼

An embodiment of the present invention is a system for time multiplexing a carrier signal received by two or more GPS antennas through a single hardware path, using a single receiver\s oscillator in that hardware path as a reference to compare the phase from each antenna. One of the antennas is designated as a reference antenna and a carrier signal received by it is used to phase lock in numerically controlled oscillator. The same carrier signal received by the other antennas is periodically compared in phase to the output of the numerically controlled oscillator. Each comparison results in a phase angle measurement for the respective antennas compared to the master antenna.

대표청구항 ▼

A direction angle measurement system, comprising: at least two GPS antennas for producing a plurality of respective output signals for a GPS carrier signal that differ in phase according to the geometry of the relative positions of the GPS antennas and a GPS satellite transmitting said GPS carrier signal; input multiplexing means for selecting one of said output signals from the GPS antennas and having a selected-antenna output signal; a radio frequency amplification stage for producing an amplified RF signal from said selected-antenna output signal; a correlator for mixing said amplified RF signal with a reference frequency signal to produce a phase detector signal output; output multiplexing means synchronized to the input multiplexing means for distributing said phase detector signal output to respective differential phase output signal ports; a variable frequency oscillator for generating said reference frequency signal; a phase locked loop for controlling the variable frequency oscillator to lock in phase to said selected-antenna output signal during a first time period when a first of said GPS antennas is selected and to substantially not drift from said phase lock at time periods other than said first time period; and a phase differencer for measuring a phase difference between said reference frequency signal and said selected-antenna output signal at a second time when a second of said GPS antennas is selected, wherein said phase difference is proportional to a differential range between the GPS antennas and said GPS satellite.

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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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Differential phase measurement through antenna multiplexing 원문보기

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Differential phase measurement through antenna multiplexing 원문보기

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