Modeling and simulation of Site Selection System in Ground Pseudolites Test System

The products of GPS navigation should be tested and calibrated on the ground prior to which enter the market, as a result it is necessary to build a ground based pseudolites test system in order to simulate the GPS constellation.A suit of visual and friendly software was designed based on VC and MAPX, which could analyze the electric map.Using the dilution of precision(DOP) as a standard, this software could also calculate the core test area and have an overall simulation about the site selection of pseudolites.