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A pseudorange is the circle of a receiver’s possible geographical positions relative to a GPS satellite (the transmitter), determined by the receiver’s knowledge of two data: the transmitter’s location, and the distance between the transmitter and the receiver. In GPS (the Global Positioning System) the receiver is a GPS receiver, and the transmitter is a GPS satellite. The GPS receiver calculates its exact position by comparing the pseudoranges of multiple transmitters and identifying where they intersect.