Pseudolite-aided GPS: a comparison

The author suggests that there is strong reason to believe that variations in GPS (Global Positioning System) performance as a function of location and time can be mitigated by augmenting the GPS system with pseudolites in pure geodetic, differential, and hybrid forms. Analyses have been performed to calculate the relative merits of these augmentations. The area of detail studied was the southwestern US to ascertain the effects on a typical test range. Simulation results show that the navigation solution accuracy of either a stationary or mobile user improves by adding pseudolites with a pure geodetic capability, and improves dramatically with a differential capability. The results demonstrate the time dependence of the navigation solution at the user location