Multilateration
Multilateration is a process of determining position of an object using multiple separate receivers or transmitters of some kind of signal. It can be done in 2D or 3D. Multilateration can be used as a technique for 3D tracking using electromagnetic signals or acoustic signals.
It can be used in a hybrid tracking system for the position component of the 6DOF pose.
For time-of-flight, there is only one place where all of the signals overlap at the same time, and that is where the object is.
Trilateration is for using a triangle of sensors to determine position in a 2D plane.
For two dimensions, multilateration generally needs 3 sensors/sources minimum. For 3D, it generally needs 4 sensors/sources minimum.
Technologies[edit]
- Electric field sensing
- Acoustic tracking
- UWB
Methods[edit]
- Time of arrival (TOA), also known as time of flight (ToF)
- Received signal strength (RSS)
- Heterodyne subsampling time of flight
- Time difference of arrival (TDOA)
Subsampling time of flight[edit]
Subsampling time of flight is useful for RF time of flight to keep costs low, not requiring a multi-Ghz oscillator.
Subsampling time of flight is useful for measuring the field front in a time-of-flight electric field sensing system.
TDOA[edit]
Time difference of arrival can be done using iterative methods, also known as numerical methods, using least squares methods.
TDOA is most useful when the thing one is tracking is wireless.
See also[edit]
- Angle of arrival (AoA)