Velocity determination as one of the widely used spatial information is essential for the location-based services. Concerned researches about Global Navigation Satellite System (GNSS) velocity determination mainly focus on copyright phase observations. which ignored the merits of multi-type observations transmitted by multi-GNSS satellites. To increase the performances of GNSS velocit... https://www.roneverhart.com/Baby-Gee-Moxxie-2-1x2-1/