[aprssig] indoor tracking. RFID

Brian B. Riley brianbr at mac.com
Wed Jun 1 08:38:19 CDT 2005

The simplest implementable solution would be something Bob espoused long
ago, tie a PIC/MIM unit to a 433 MHz key  fob transmitter and setup up
vicinity tracking digis. The 'new' technology here would be the 'digi' ...
We need to be able to put something like this with the 433 receiver and a
linking channel transmitter into a PIC or ATMEL package (actually this looks
like a perfect application for John Hansen's TNC-X!).  Its kinda like a
wedding " ... something old, something new ..."

Cheers ... 73 de brian, n1bq, underhill center, vermont

On 5/31/05 10:57 PM, "Robert Bruninga" <bruninga at usna.edu> wrote:

>>>> Wes Johnston <wes at kd4rdb.com> 5/31/2005 9:36:52 PM >>>
>> The problem is that when I walk inside a building
>> and my GPS unit looses lock, you'll still plot me at
>> the location of my last posit, which could be, say,
>> a mile away. [in a very big building]...
>> Suggestions?
> When you enter the building, APRSdos keeps track of
> where you entered it.  Unless there is a BOX-N digi
> inside, then it can take over and force a vicinity
> plot inside the building if for example there are BOX-N
> digis inside the various areas in the building...  Bob
> Wes
> Robert Bruninga wrote: Wes Johnston <aprs at kd4rdb.com> 5/31/2005 6:21:19
> PM >>>        ... Does APRSdos begin to plot me in proximity to the
> first digipeater?...  I remember you saying that APRS DOS would
> plotunknown [position] stations in proximity to the first digipeater...
>   Yes, but only if no other position data is available.If I have
> previously received a posit, and he has nottimed out of the list, then
> his last posit is retained.I assume a tracker with invalid GPS data will
> nottansmit any more positions and after 80 minutes(default) he fades to
> gray.   Bob  

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