With this heuristic, we can choose to calculate two points using the two best BTSs and then just use the values from the third BTS to choose between the two points. Calculating the intersection using triangulation A method for calculating the coordinates of the most probable points using the mean values for the distances from the BTSs is needed. In addition the mean distances d 1 a and d 2 is known. An estimate of a probability radius Estimates for probabilities circles can be found directly from the distance distributions. Circle estimates are centered in the most probable point, which is already found.
Figure shows that selecting radii on the probability circles carefully give predictable results.
For the case of three or more BTSs, this procedure become too complicated to be practical. In these cases one would choose to use only results from the two best BTSs, and let results from subsequent BTSs only point out the correct solution for the most probable point. The two calculation methods presented, show two different approaches to calculation implementations. The matrix method is obviously a more correct and accurate solution. When the distances are calculated using measurement maps, the matrix method is the only correct solution.