سه‌پهلوبندی

Also known as multilateration

right|210px|thumb|Trilateration in three-dimensional geometry right|150px|thumb|Intersection point of three pseudo-ranges Trilateration is the use of distances (or "ranges") for determining the unknown position coordinates of a point of interest. When more than three distances are involved, it may also be called multilateration, for emphasis. The point of interest is often around Earth (geopositioning).