A vehicle location system (VLS) solution approach

Abstract

The Hughes vehicle location system (VLS), which locates and tracks one or more asynchronous aperiodic transmitters in either two or three dimensions, is described. It uses a dynamic receiver time-of-arrival (TOA) source selection, a direct hyperbolic position location solution, and an observation noise filter. For tracking a transmitter in two dimensions in an overdetermined system, hyperbolic geometric-dilution-of-precision (GDOP) is used to select an optimum subset of TOA triplets and to form a weighted position estimate. Particular emphasis is placed on the 2-D direct solution approach. The effect of observation noise on position estimation error in 2-D for an overdetermined system is demonstrated, and the derivation of the 2-D direct solution approach is presented.<>