[특허]Fast acquisition position reporting system

[미국특허] Fast acquisition position reporting system 원문보기

IPC분류정보
국가/구분	United States(US) Patent 등록
국제특허분류(IPC7판)	G01S-005/02 G04S-005/10
출원번호	US-0351852 (1999-07-12)
발명자 / 주소	Kilfeather James B. Sullivan Mark C.
출원인 / 주소	Eagle Eye, Inc.
대리인 / 주소	Pittman
인용정보	피인용 횟수 : 82 인용 특허 : 20

초록 ▼

A geographic tracking system with minimal power and size required at the mobile terminal collects observation data at the mobile terminal, forwards the data to a processor, which calculates the position. The mobile terminal needs only to gather a few milliseconds of observation data, and to relay this observation data to the processor. The range from the satellite (or other airborne transponder) to the terminal is determined using the known positions of an interrogating transmitter and a satellite, and a known terminal delay between the received signal and the transmission of the return signal, and the round trip time. An arc of locations is determined by computing an intersection of a sphere centered at the satellite having a radius given by the calculated range with a model of the Earth's surface. Only that portion of the arc within the region bounded by the satellite beam pattern is retained. Next, the time when the mobile terminal collected the GPS signal is determined. A satellite orbit model estimates the positions of the GPS satellites at their time of transmission. Using discrete points on the arc as an initial guess, an iterative least squares technique fits the observation data to the predicted data and minimizes residual error. After convergence, this estimated position solution is then screened against the known satellite range, satellite beam boundaries, an acceptable altitude range, and a maximum residual threshold. Those position estimates not meeting these criteria are discarded. The remaining points are then subjected to a final improved position estimate and residual calculation and the best point is selected.

대표청구항 ▼

[ What is claimed is:] [1.]1. A system for determining a location of a remote terminal located on or near the surface of the Earth by communicating with an orbiting communications satellite, said system comprising:a) a satellite gateway broadcasting an interrogation signal to the remote terminal via the communications satellite;b) said remote terminal including:(i) a receiver receiving the interrogation signal from the communications satellite, said receiver receiving a plurality of signals being broadcast from a plurality of GPS satellites;(ii) a processor measuring at least one characteristic in each of the plurality of signals being broadcast from the plurality of GPS satellites at a first predetermined time relative to receipt of the interrogation signal from the communications satellite; and(iii) a transmitter transmitting a reply signal at a second predetermined time relative to receipt of the interrogation signal to the communications satellite, wherein said reply signal includes the measured characteristic in each of the plurality of signals being broadcast from the plurality of GPS satellites;c) an earth station receiving the reply signal from the communications satellite, and measuring time of arrival information; andd) an operations center calculating a position of the remote terminal using time of arrival information and the measured characteristics returned by the remote terminal.

이 특허에 인용된 특허 (20) 인용/피인용 타임라인 분석

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Wiedeman Robert A. (Los Altos CA) Monte Paul A. (San Jose CA), Satellite telecommunications system using network coordinating gateways operative with a terrestrial communication syste.
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Sagey William E. (Orange CA) Lind Harold V. (Santa Ana CA) Lind Carl E. (Santa Ana CA), Vehicle location system.
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Mansell John P. (Dallas TX) Riley William M. (Dallas TX), Vehicle tracking and security system.
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Brown Alison K. (Monument CO) Sturza Mark A. (Woodland Hills CA), Vehicle tracking system employing global positioning system (GPS) satellites.
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[미국특허] Fast acquisition position reporting system 원문보기

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