Multiplex communications – Communication over free space – Repeater
Patent
1995-06-07
1997-11-25
Olms, Douglas W.
Multiplex communications
Communication over free space
Repeater
340989, 340992, 342457, 455 541, H04B 7185
Patent
active
056919808
ABSTRACT:
A mobile local area network (LAN) of tracked assets utilizing minimal power and bandwidth allows a large number of assets to be tracked in a practical manner. The mobile LAN is established between a plurality of tracking units in close proximity. Assets are approximately located according to their connection in the mobile LAN where the exact location of at least one of the network nodes is known. Each tracked asset has capability to independently determine and report its position to a central station, and each asset also has capability to communicate locally with other cooperative assets via the LAN. The LAN is dynamically reconfigurable so that as other cooperative assets come into proximity, they can join the network, and as others move away, they can leave the network. Within the network, a protocol is followed which assigns one of the assets to be the "master" and all others to be "slaves". The master asset takes responsibility for determining its own exact geographical position via LORAN, OMEGA, Global Positioning System (GPS) or other navigational aid. When connected in a LAN, slave assets report their ID to the master asset and do not determine their own locations in order to conserve power. The master reports its location and ID, as well as the IDs of the other assets in the LAN, to the central station. Uncertainty in the location of a slave asset is limited by the known possible geographical extent of the LAN which is known a priori.
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Chennakeshu Sandeep
Tiemann Jerome Johnson
Tomlinson, Jr. Harold Woodruff
Welles II Kenneth Brakeley
General Electric Company
Jung Min
Olms Douglas W.
Snyder Marvin
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