05365516 is referenced by 456 patents and cites 46 patents.

A multilaterating two-way message delivery system for mobile resource management provides efficient two-way radio data communication for multitudes of portable transponders using a single frequency in half-duplex communication. The system includes at least one transponder device which transmits and receives data using a radio frequency communication link, and an array of at least three base stations which communicate with the transponder device using the radio frequency communication link. The radio frequency communication link employed by each base station and the transponder device is designed to provide multilateration information and to deliver message data simultaneously. Further, a control arrangement is coupled to the array of base stations to coordinate the communication between the base stations and the transponder devices. Time-division multiplex and spread spectrum technology is employed by the system for communication efficiency and minimizing the effect of multipath interference.

Title
Communication system and method for determining the location of a transponder unit
Application Number
7/746954
Publication Number
5365516
Application Date
August 16, 1991
Publication Date
November 15, 1994
Inventor
Louis H M Jandrell
Dallas
TX, US
Agent
Arnold White & Durkee
Assignee
Pinpoint Communications
TX, US
IPC
H04B 7/17
H04K 1/02
G01S 3/02
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