Global positioning system(s) assume an 'earth centered, earth fixed, x-y-z 3D cartesian coordinate system'. Radio navigation systems trilateration is the basis of GPS. Both of these systems are also commonly used with More sites, or with triangulation, which uses the measurement ofĪbsolute angles. Multilateration should not be confused with trilateration, which usesĭistances or absolute measurements of time-of-flight from three or Even when GPS is leveraging more than 4 satellites, it is still doing trilateration, as opposed to multilateration, which GPS does not use. points out, this is not a form of triangulation. Timing and location correction and selects one of the remaining twoĪs R.K. Finally, the forth satellite helps calculate a The third satellite reduces the choice to two possible To a circle created by the intersection of the two satellite spheres The second satellite narrows your location The first satellite locates you somewhere on a sphere This is a high-tech version of triangulation, called
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