[특허]System for simultaneously deriving position information from a plurality of satellite transmissions

System for simultaneously deriving position information from a plurality of satellite transmissions 원문보기

IPC분류정보
국가/구분	United States(US) Patent 등록
국제특허분류(IPC7판)	G01S-005/08 H04B-007/185
출원번호	US-0643771 (1991-01-22)
발명자 / 주소	Counselman III Charles C. (Belmont MA)
출원인 / 주소	Western Atlas International, Inc. (Houston TX 02)
인용정보	피인용 횟수 : 36 인용 특허 : 0

초록 ▼

A method and a system are disclosed for measuring the baseline vector between a pair of survey marks on the ground by radio interferometry using radio signals broadcast from the earth orbiting satellites of the NAVSTAR Global Positioning System (GPS), the radio signals broadcast by the satellites being double-sideband modulated with their carriers suppressed. An antenna is positioned at each survey mark. The signals received by one antenna during a predetermined time span are separated into upper and lower sideband components. These separate components are filtered, converted to digital form, and then multiplied together. Their product is analyzed digitally by means of correlation with quadrature outputs of a local oscillator to determine the power, and the phase relative to that local oscillator, of the carrier wave that is implicit in the double-sideband signal being received from each satellite. Differences in Doppler shift are utilized to distinguish the carriers of different satellites. The signals received at the same time by the other antenna are processed in the same manner. Thus, the powers and carrier phases of the signals from a plurality of satellites are measured simultaneously and numerical data representing the measurement results are obtained at each survey mark. The measurements are performed in real time at each mark without reference to signals that are received at any other place and without knowledge of any of the coded signals that modulate the GPS carriers. The data from the measurements performed simultaneously but independently at the two survey marks, once per second for a predetermined time span, are then processed together to determine the baseline vector that extends from one mark to the other. Two methods of processing are disclosed in either method, an “ambiguity function”is computed which is a function of the measurement data and of a trivial value of the baseline vector. The vector space of is systematically searched to find the unique value of that maximizes the computed function. This value of is taken to be the desired determination of . By using signals from a plurality of five satellites and a time span of about 5000 seconds, a baseline vector determination can be obtained by the method of the present invention with an accuracy of about 5 millimeters in each coordinate for a baseline length of about 100 meters.

대표청구항 ▼

The method of determining position information from suppressed-carrier radio signals modulated by an unknown pseudo-random code, transmitted by earth-orbiting satellites, comprising: (a) receiving the signals from a plurality of satellites simultaneously with an omni-directional antenna; (b) generating predictions of the Doppler shifts of the signals received by said antenna; (c) correlating the signals received by said antenna with the predictions to cancel the Doppler shifts and correlating the signals received by said antenna with themselves to square the unknown pseudo-random code modulation so that the resulting correlation products have slowly varying phase angles related to the phases of carrier waves implicit in the received signals; (d) time-averaging said correlation products to obtain data indicating the phase of a carrier wave implicit in the signal received from each satellite, for a plurality of satellites simultaneously; and (e) processing said data indicating the phase of a carrier implicit in the signal received from each satellite to obtain position information.

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System for simultaneously deriving position information from a plurality of satellite transmissions 원문보기

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