The relative precision of carrier phase measurement can reach millimeter, but its periodicity causes the uncer-tainty of its ambiguity, so it is necessary to calculate its ambiguity. The traditional calculating method is highly precise but time-consuming which can not satisfy dynamic positioning. The geometric constraint algorithm has relatively high posi-tioning speed, but due to the error of baseline apriori information, it is less reliable. Accordingly, a new ambiguity calculat-ing method is proposed in this paper, which can increase the calculating speed through the baseline vector constra...
