Regional satellite positioning constellation scheme discussion

The characteristics of present Beidou satellite positioningsystem are analyzed. In order to perfect our country regional satellite positioningsystem, the idea of Beidou geosychronous earth orbit(GEO) satellites combined with some middleearth orbit (MEO) satellites constellation is put forward. The details of general satellite constellation optimized method are described, using this method the multiple positioning constellation design results aregained. And those results belong to two typeof schemes, one is 2 GEO plus some MEO satellites and the other is 3 GEO plus some MEO satellites. Through simulation and comparison, among those multiple design results, final optimized regional positioning constellation is given. In order to check the chosen constellation cover performance, the position dilution of precision(PDOP) is calculated, and with satellite constellation simulation software Satlab many coverage performances of the chosen constellation substellar point track, elevation, azimuth and visiblesatellites number changing situation are also simulated.