Positioning using pseudoranges (trilateration) 1

pseudoranges diagram

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Each satellite generates a different coded signal and this enables pseudoranges to several satellites to be measured at the same time.

The satellite positions are known and if the pseudoranges of the receiver to at least four satellites are measured, the position of receiver can be computed.

One pseudorange narrows down the postition to the surface of a sphere.

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