Dilution of Precision

There is some uncertainty, however, in the receiver’s measurements, and so the location of the range circles will be inexact and result in an error in the computed position. This error depends on the geometry relating the receiver and the transmitters. In Figure 1a, the transmitters are far apart, giving a relatively small region in which the receiver must lie with some degree of certainty. Transmitter 1 lies in a direction orthogonal to that of transmitter 2, so the receiver’s X and Y coordinates are deter-