09541626 cites 24 patents.

A method, apparatus and system for globally referenced positioning in a shielded environment includes integrating and correlating information from a UWB receiver, a GPS receiver, and a bent-path GPS receiver adapted to extract a GPS radio frequency wave from a heterodyned GPS signal. The method, apparatus, and system is resistant to interference and can be used in a shielded environment such as indoors or behind a line-of-sight barrier.

Title
Globally referenced positioning in a shielded environment
Application Number
14/247814
Publication Number
9541626 (B2)
Application Date
April 8, 2014
Publication Date
January 10, 2017
Inventor
Philip T Kennedy
Cedar Rapids
IA, US
Leslie D Baych
Cedar Rapids
IA, US
David M Snyder
Cedar Rapids
IA, US
Bruce D Melick
Cedar Rapids
IA, US
Agent
Mckee Voorhees & Sease
Assignee
Lightwaves Systems
IA, US
IPC
G01S 19/11
G01S 1/04
G01S 19/21
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