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RFID, other technologies to track position of moving objects in room

J

jpreble

Jan 1, 1970
0
I am just starting to investigate various technologies in the realm of
wireless, RFID, IR, laser, motion detection, etc. and was hoping
someone might be able to offer some insight and point me in the right
direction.

Generally what I'm looking to do is have various objects, each of
which must be uniquely identifiable (via RFID, I suppose). I need to
be able to track these objects as they move throughout a room. In
addition to knowing each object's location/position, I need to know
the distance of a given moving object from other fixed objects in the
room as well as distances between the moving objects themselves. As
objects approach some distance threshold of another moving or fixed
object, some event needs to be triggered (along the lines of motion
detection).

The resolution of distance needs to be measurable within an inch or so
ideally, and I'd like to be able to configure the distance threshold
dynamically as needed – possibly configuring different sets of
distance triggering thresholds depending on the object. I also need
to be able to determine positional changes in elevation as well as
laterally. The refresh rate for updating an object's
location/distance should be relatively quick, but does not require
absolute "real-time" updates. Again, if the refresh rate could be
configured, that would be a plus as well.

My questions are many at this point as I'm just starting to
investigate the various technologies that seem to offer some
possibilities. To start, I'd like to know what technologies or
combination of technologies – wireless, IR, RFID, laser, ultrasonic,
others, etc – are best suited to allow me to do what I'm attempting.
From what I've been reading, Active RFID tagging appears to offer much
of what I want to do, although I'm not sure of it's capability in
determining more precise location/position information of tagged
objects, and particularly elevation changes.

Also, for the applicable technologies, what hardware is
available/necessary to interface with a PC? And are there any
software applications and/or development technologies that aid in
interfacing with these devices and monitoring any activity/changes in
distances/position, etc. I'm somewhat less concerned about the
software at this point as I could custom develop something as needed,
once I know what I'm trying to interface with.

One of my primary concerns is cost. I'd like to have a solution that
is relatively inexpensive as there will be many objects that would
need identification and tracking.

Any information or direction anyone can provide would be greatly
appreciated. Thanks in advance for your comments.
 
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