LocusLabs seems to have products for airports but they don’t describe their 
technology.
Perhaps it is nothing more than a bunch of receivers with Doppler antennas on 
them triangulating signals.  

From: [email protected] 
Sent: Wednesday, February 26, 2020 10:46 AM
To: [email protected] 
Subject: OT bluetooth nav

Anyone know how location tracking of cell phones indoors works?  I believe it 
is based on bluetooth. Works inside airports.  I see Amazon using something 
similar for their cashless grocery store.  
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