Multilateration
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Multilateration is a process of determining position of an object from separated sources. It can be done in 2D or 3D. Multilateration can be used as a technique for 3D tracking using electromagnetic signals or acoustic signals.
Trilateration is for using a triangle of sensors to determine position in a 2D plane.
For a 2D plane, multilateration generally needs 3 sensors/sources minimum. For 3D, it generally needs 4 sensors/sources minimum.
It can be done using iterative methods, also known as numerical methods, using least squares methods.
There is only one place where all of the signals overlap, and that is where the object is.
Multilateration can be done with UWB.