Knowra Trilateration Trilateration Trilateration locates an unknown point by measuring its distances from known positions. In two dimensions, three distance measurements can identify a point when the reference positions are not collinear.
Circle-circle intersection : The set of points shared by two circles, usually zero, one, or two points. Each measured distance defines a circle around a reference point; their intersections narrow the location.
Global Positioning System : A satellite-based navigation system that provides positioning, navigation, and timing services worldwide. GPS receivers estimate their positions from ranges to satellites, usually with additional clock-bias correction.
Euclidean distance : The straight-line distance between two points in Euclidean space. Trilateration treats measured ranges as straight-line distances in its geometric model.
Triangulation : A method of locating a point from measured angles to it from known positions. Trilateration uses distances, whereas triangulation uses angles.
Sphere-sphere intersection : The set of points shared by two spheres, generally a circle, one point, or no points. In three dimensions, two range measurements leave a circle of possible positions.
Indoor positioning system : A system that estimates locations of people or objects inside buildings. Indoor systems use measured radio, acoustic, or optical ranges where satellite signals are unavailable.
Coordinate system : A framework of coordinates used to specify positions in space. Known reference positions and the unknown location must be expressed in a common frame.
Time-difference-of-arrival localization : A positioning method that estimates location from differences in signal arrival times at synchronized receivers. It constrains differences between ranges rather than measuring each absolute range.
Multilateration : A family of positioning methods that infer locations from multiple distance or range-difference measurements. Trilateration is its distance-measurement case; the broader family also includes time-difference methods.
Radio-frequency identification : A technology that identifies tagged objects using radio waves. Ranging-capable RFID systems can use distances to several anchors to locate a tag.
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