In time different of arrival, at the beginning, all base stations are synchronized.
There are three access points (AP1, AP2, AP3), when a client transmits a signal like a sound wave, each of access points will produce a time of arrival measurement.
Equations of TDOA can be obtained.
In the above equations, AP1(x1,y1), AP2(x2,y2), AP3(x3,y3)
Each TDOA equation is a hyperbola, so the target location can be located as the intersection point of equations.
