With rapid development of economy and society, the problem caused by traffic is becoming more and more serious. Intelligent Transportation System (ITS), which is widely studied in developed countries, is thought of a potent way to the ground traffic problem today. ITS which is an important symbol of ground transportation system will come in the 21st century. Ground traffic-information, which mainly consists of traffic-flow, is an indispensable element of ITS. It is a key of ITS to predict traffic-flow exact...