Multilateration - the calculation of a position based on the time difference of accurate clocks from recievers at fixed position. A short signal is sent from the transmitter to 4 points on the earths surface. Now using the Difference in the Arrival time, the recievers, using atomic clocks accurately calculate the transmitters position.

Nope. In multilateration, the unit whose position is to be determined,

*transmits* a signal to multiple receivers that use time difference of arrival

*between the receiving sites* to determine a set of possible locations that lie in a

**hyperboloid**, hence the term

**hyperbolic positioning**. This does

*not* require an absolute time, as the only thing that matters is the difference of arrival times between the receivers. Now, if you add in a third receiver, you now get another hyperboloid, defining a curve in space. Toss in a fourth receiver, and you now have your location in space, without reference to an absolute time.

In case you don't know, a hyperboloid is kind of like two cones connected at the points.

What I explained was nothing like multilateration: The unit whose position is to be determined,

*receives* absolute time and position signals from a transmitter. Using the

**time delay in reception**, it calculates its distance from the transmitter. This defines a

**sphere** in space. A sphere is not a hyperboloid.