jtiernan2008
asked on
Does anyone have any resources or what algorithm to use for DTOA in a RTLS
I have a project whereby I need to develop an application in java to calculate an RFID tagged object using DTOA (differential time of arrival) between four readers in a room. So when the tag beacons, it will hit each of the tags at different times and from that I need to calcuate the co-ordinates of the device. I am not looking for the code but an algorithm. Does anyone have any suggestions or resources?
ASKER CERTIFIED SOLUTION
membership
This solution is only available to members.
To access this solution, you must be a member of Experts Exchange.
ASKER
This is pointing me in the right direction... thanks
Assumptions:
Location on an axis W-E or N-S is expressed as a straight line from that wall.
West wall is 0 and East wall is full width of room (W).
North wall is 0 and South wall is full length of room (L).
Amount of time (N) that it takes to get a wall/sensor is equivalent to (time received - time sent) expressed in some time interval (t). Nw = west wall, Ne = east wall, Nn = north wall, Ns = south wall.
There is a set rate of travel for a signal in this room expressed by distance over time interval (d/t).
So each of the coordinates x (W-E axis) and y (N-S axis) have two equations each.
x = Nw * d/t
x = W - (Ne * d/t)
y = Nn * d/t
y = L - (Ns * d/t)
Solving for x and y will give you your (x, y) coordinate.
Just some thoughts -- hopefully not totally useless :).