System and method of tracking entry to and exit from a confined space

A method of tracking entry to and exit from a confined space includes a portable radio beacon placed proximate to but outside the confined space transmitting a first radio signal with an identifier that is associated with the confined space. A mobile device receives the first radio signal, measures...

Ausführliche Beschreibung

Bibliographische Detailangaben

Hauptverfasser:	Salour, Ali, Pang, David S, Salstrom, Daren, McInnis, Michael D
Format:	Patent
Sprache:	eng
Schlagworte:	ELECTRIC COMMUNICATION TECHNIQUE ELECTRICITY TRANSMISSION WIRELESS COMMUNICATIONS NETWORKS
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