The determination of position in a radiolocation system based on time-of-flight (TOF) estimation is closely related to time measurements in the transmitting and receiving nodes. In theory, TOF can be determined from the time of the transmission at the transmitting node and the time of reception at the receiving node. Such a concept implies that the clocks in the nodes are synchronized in time, and thus clearly the accuracy of range measurements is directly related to the accuracy of time synchronization. Such time synchronization can in turn be achieved by a node with a reference clock transmitting a signal which can be received by all the other nodes in the network. As fixed nodes have known positions, the TOF can be inferred from the distance between the nodes, assuming straight-line radio propagation.
Frequency Synchronization Time Reference Signal Mobile Nodes Master Station Geometric Dilution Of Precision (GDOP)
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