METHOD FOR THE HIGH ACCURACY GEOLOCATION OF OUTDOOR MOBILE EMITTERS OF CDMA CELLULAR SYSTEMS

A high-accuracy method for the geolocation, without the collaboration of th e network, of outdoor mobile emitters of a CDMA cellular system, based on the ability to distinguishing between line-of sight and reflected signals. The method employs time-of flight and angle-of arrival information in order...

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Bibliographische Detailangaben
Hauptverfasser:	COLMAN, GEOFFREY, WIGHT, JAMES S, BROUSSEAU, NICOLE
Format:	Patent
Sprache:	eng ; fre
Schlagworte:	ANALOGOUS ARRANGEMENTS USING OTHER WAVES DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES ELECTRIC COMMUNICATION TECHNIQUE ELECTRICITY LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION ORRERADIATION OF RADIO WAVES MEASURING PHYSICS RADIO DIRECTION-FINDING RADIO NAVIGATION TESTING TRANSMISSION WIRELESS COMMUNICATIONS NETWORKS
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Beschreibung
Zusammenfassung:	A high-accuracy method for the geolocation, without the collaboration of th e network, of outdoor mobile emitters of a CDMA cellular system, based on the ability to distinguishing between line-of sight and reflected signals. The method employs time-of flight and angle-of arrival information in order to determine whethe r a signal received by each of two or more interceptors situated at different locations is line-of-sight or reflected. Time-of flight information is obtained with the aid of the reverse link of a mobile of interest. At those instances in time when the signal received at two or more interceptors is line-of sight, the location of the mobile can be accurately determined using conventional direction-finding techniques. Since the signal received by an interceptor from a mobile may be very weak, adaptive threshold digital signal processing techniques may be employed to control the probability of detectio n and the probability of false alarms.