Adaptive Solution for Updating Moving Object Database
Wang Qing · Journal of Chinese Computer Systems · 2010
When to update control center is a key problem in the field of moving object database.Based on the idea of short-term linearization,constant-velocity and constant-acceleration-constant-angular-velocity models are presented to describe moving objects.Then,quantitative fuzzy description method is used to tell the state of a moving object.Kinds of factors such as deduction position error,speed change,time duration,are considered,an OR arithmetic logic computing unit is used to decide whether to update current state to center control unit.By using map-matching result,according to road shape,an adaptive method to select object dynamic model is given.Finally,tests are done in Nanjing to verify the performance of the solution.By using adaptive dynamic model and quantitative fuzzy description,the algorithm can decrease the overall update frequency,and at the same time faithfully keep object state information in database.