Ranging system using correlation between two spread spectrum wave signals
First Claim
1. A ranging system using the correlation between two spread spectrum wave signals comprising means for receiving from a single radio source two spread spectrum modulated signals simultaneously transmitted in the same code on carrier waves of different frequency, means for multiplying the received signals by each other to generate two continuous signals of frequencies respectively equal to the difference and the sum of the carrier waves of the spread spectrum signals, and means for measuring the phases of the two continuous signals with reference to a reference clock at the receiving station, whereby the ambiguity at the time of range measurement is removed.
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Abstract
A ranging system using the correlation between two spread spectrum wave signals includes an antenna for receiving from a single radio source two spread spectrum modulated signals simultaneously transmitted in the same code on carrier waves of different frequency, a multiplier for multiplying the received signals by each other to generate two continuous signals of frequencies respectively equal to the difference and the sum of the carrier waves of the spread spectrum signals, and a data processing computer for measuring the phases of the two continuous signals with reference to a reference clock at the receiving station so as to remove the ambiguity at the time of range measurement.
28 Citations
1 Claim
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1. A ranging system using the correlation between two spread spectrum wave signals comprising means for receiving from a single radio source two spread spectrum modulated signals simultaneously transmitted in the same code on carrier waves of different frequency, means for multiplying the received signals by each other to generate two continuous signals of frequencies respectively equal to the difference and the sum of the carrier waves of the spread spectrum signals, and means for measuring the phases of the two continuous signals with reference to a reference clock at the receiving station, whereby the ambiguity at the time of range measurement is removed.
Specification
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- Resources
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Current AssigneeNational Institute of Information and Communications Technology
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Original AssigneeCommunications Research Laboratory, Ministry Of Posts And Telecommunications
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InventorsImae, Michito, Miki, Chihiro
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Primary Examiner(s)Blum, Theodore M.
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Application NumberUS07/498,550Time in Patent Office491 DaysField of Search342/357, 342/352, 375/1US Class Current342/357.27CPC Class CodesG01S 19/30 code related G01S19/246 tak...G01S 19/32 Multimode operation in a si...
