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help with multilateration wikipedia webpage explanation

Trying to understand the wiki explanation of multilateration below;
http://en.wikipedia.org/wiki/Multilateration 
Is Tc i.e. the central site... Is this the emitting tag or another reader?
I am trying to design a simple RFID locating system using DTOA.
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jtiernan2008
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jtiernan2008
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thehagmanCommented:
Tc is one of four readers, the emitting tag is at (x,y,z).
Of course with (usually passive) RFIDs, the RFID tag is only a "secondary" emitter, induced by some primary emitter - which *may* be identical with one of the four receivers
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jtiernan2008Author Commented:
I am using cheap active tags for the purpose of the project. Do I need 4 readers or can I do with three since after all the simualtion is a bird's eye view so this would be 2D? Or am I misunderstanding the concept?
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NovaDenizenCommented:
If the location of the target object is constrained to a plane, and you have 3 sensors in the same plane, you ought to be able to locate the object.
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jtiernan2008Author Commented:
Also what is the minimum distance that can be allowed between the reader and the tag and the readers between each other. I know that the tag cannot be detected by the reader correctly unless it is more than a metre from the reader as per the specifications posted with the devices. I have heard that the DTOA is usually used on a large scale while RSS is used on the smaller scale. Is this true. I cannot use RSS as the tags do not allow for this functionality. What is the reason for the minimum distance that you advise above.
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jtiernan2008Author Commented:
anyone?
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NovaDenizenCommented:
If you ask generic questions about geometry, triangulation or multilateration, then I might be able to help you.  If you ask specific questions about specific unnamed RFID components then I really can't help you.
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