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[aprssig] APRS RF-ID

Lynn W. Deffenbaugh (Mr) ldeffenb at homeside.to
Mon Feb 23 14:02:39 UTC 2009


Even with "badge-out", unless there's a single-person man-trap at the 
entrance/exit, you'll still end up with some residual "people" at the 
EOC, especially after a mass meeting.  One person will use their badge 
to open the door and the whole group will leave undetected.  It's 
sometimes a problem on entry, but more often on exit.  Been there, done 
that, and there really isn't a good solution except for double-scanning 
RFID across then entrance/exit in order to accurately catch EVERYONE 
with an RFID badge as well as to determine their direction (entering or 
leaving based on which "saw" them first and second).

It all depends on the use of the data.  If it is simply for curiosity, 
it would provide that.  If it is for practically any other purpose, the 
resulting data is probably not accurate enough.

Lynn (D) - KJ4ERJ - Devolving into RFID rather than APRS...

Jason Rausch wrote:
>> The bigger (and harder to answer) question is when did that someone/
>> thing LEAVE a location?
>>     
>
> The only way to combat this is forcing them to "badge-out" as they leave the building.  Depending on how the door system works, they may already have to do this.
>
> Jason KE4NYV
> RPC Electronics
> www.rpc-electronics.com
>
> --- On Mon, 2/23/09, Lynn W. Deffenbaugh (Mr) <ldeffenb at homeside.to> wrote:
>
> From: Lynn W. Deffenbaugh (Mr) <ldeffenb at homeside.to>
> Subject: Re: [aprssig] APRS RF-ID
> To: "TAPR APRS Mailing List" <aprssig at tapr.org>
> Date: Monday, February 23, 2009, 8:49 AM
>
> As is almost always the case with RFID applications, it's easy to know 
> when someone/thing arrives at a location.  The bigger (and harder to 
> answer) question is when did that someone/thing LEAVE a location?  Is 
> it/him/her still there 5 hours later?  10 hours?  Imagine the stack at 
> the EOC if you look at the last known coordinates of emergency personnel 
> one week after an all-hands meeting...
>
> Lynn (D) - KJ4ERJ - An RFID application programmer
>
> Bob Bruninga wrote:
>   
>> APRS-RFID almost!
>>
>> Was giving a talk at the local ARES organization in the local county EOC and mentioned how we could use ARRL radio badges with RFID built in, so that when anyone entered the EOC, their presence would show up on APRS at the EOC on the map.
>>
>> See www.aprs.org/aprs-rfid.html
>>
>> One of the ARES members pointed out, that to get into the EOC, they have to run their county-issued badge through the door access panel already.  Bingo, the EOC computers -know- he is there!  All we need is to ask them to send us a file or signal, and then we can convert that to APRS and send it out the EOC APRS radio and see who is there.  Done!
>>
>> thoughts?
>>
>> Bob, WB4APR
>>
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>>    
>>     
>
>
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