A FAST SATELLITE SELECTION ALGORITHM FOR COMBINED GPS AND GLONASS RECEIVERS

This paper derives a fast satellite selection algorithm; that is, an a lgorithm to select the best subset of satellites to use for positionin g in circumstances whereby a satellite navigation receiver is not capa ble of using all satellites in view. The algorithm adopts the weightin g factor concept to determine the contribution of each satellite to th e overall positioning accuracy. Selection by this algorithm is shown t o be especially efficient when the number of available satellites is l arge, so it is likely to be particularly useful for receivers capable of making combined measurements to GPS and GLONASS satellites.