USE OF PRECISION GEOMETRIC DILUTION (GDOP) TO SELECT THE BEST RECEIVER GROUP IN A MULTILATERATION SYSTEM.

摘要

A procedure for determining a precision dilution when returning the position of a target (14) by means of a multilateration system (1) comprising a set of receivers (3, 4, 5, 6) to receive signals from said target (14), a method comprising the steps of: selecting (30) a primary receiver from the set of receivers (3, 4, 5, 6); forming a first group that includes the primary, and others, of the set of receptors (3, 4, 5, 6); calculate an objective position estimate using the first group; calculate (32) a geometric precision dilution for the first group; calculate a contribution (33) to the geometric precision dilution for each receiver of the first group; determine the worst recipient of the first group that has the greatest contribution to precision geometric dilution; modify the first group by eliminating the worst receptor in the first group to form a modified group (34); calculate a geometric precision dilution for the modified group (35); compare the precision geometric dilution of the first group and the modified group (36); and if the geometric precision dilution of the modified group is less than that of the first group, then; calculate an estimate of the subsequent position of the objective using the modified group (34); and if the geometric precision dilution of the modified group is the same or greater than that of the first group, then use the first group to calculate an estimate of the target's subsequent position (37).