The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Nov. 14, 2000
Filed:
Feb. 17, 1998
Leonard Schuchman, Potomac, MD (US);
Lloyd Engelbrecht, The Sea Ranch, CA (US);
ITT Manufacturing Enterprises, Inc., Wilmington, DE (US);
Abstract
A cellular telephone communication system has at least one base station and a plurality of remote mobile stations in which both base and mobile stations have RF transceivers which communicate with each other using periodically repeated pulse sequence epochs whose time patterns are known at both transmitting and receiving station. Each mobile station transceiver, during normal operation, establishes and maintains synchronization between the start of a received pulse epoch at the mobile station and a subsequent beginning of a responsive transmitted pulse epoch. An agile antenna system is located at the base station and includes at least one scanning antenna spaced a selected distance from a central reference point. The scanning antenna is effectively rotated relative to the central reference point and adapted to receive RF transmissions from a selected mobile station, and a direction or bearing detection processor is connected to antenna systems for detecting from received RF transmissions from the selected mobile station the bearing to the selected mobile station from the base station. The bearing sensing processor is one selected from amplitude sensing, phase sensing or frequency sensing or a combination of these sensing principles. A range measuring processor circuit also at the base station measures the time interval from the start of the base station's transmitted pulse epoch to the start of a pulse epoch subsequently received from the selected mobile station and derives range to the selected mobile station therefrom.