Communications: directive radio wave systems and devices (e.g. – Directive
Patent
1997-10-31
2000-01-04
Hellner, Mark
Communications: directive radio wave systems and devices (e.g.,
Directive
340988, 340989, 246167R, 246122R, G01S 170, B61L 100, G08G 1123
Patent
active
060115084
ABSTRACT:
The invention provides guideway-based methods, apparatus and systems for tracking, sensing and communicating with objects, such as track and roadway vehicles, as well as waystations therefore. Such a system comprises a winding, a transmitter and a receiver. The winding is made up of two or more phased conductors connected to form one or more closed current paths. The phased conductors are conductive elements (such as wires) shaped or configured in periodically repeating patterns, such as saw tooths, sinusoids or square waves. The transmitter applies to at least one of the phased conductors a position-sensing signal which has an envelope that varies as a periodic function of a first position along (or relative to) the winding. The sensor, which is disposed at a second position along the winding, detects the position-sensing signals on the winding and generates a signal indicating the distance between the first and second positions. That distance signal is a function and, specifically, a superposition, of the position-sensing signals carried by the multiple phased conductors at the second position. Related methods and apparatus permit communications between objects along the winding.
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U.S. Patent Application No. 92-11687 Title: Asynchronous Bidrectional Network Interface Enabling Seamless Concurrent Processing in a Distributed Heterogeneous Multiprocessor System.
Clark Tracy M.
Perreault Brian M.
Hellner Mark
MagneMotion, Inc.
Powsner David J.
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