Abstract: Integrated Positioning System is an important part of Intelligent traffic system, The electrical technique, signal processing method, filtering and data fusion are applied in it to get continous and reliable positioning data. The system need collects many sensors data, so we design Time-Petri net with feed back to get accurate singal sequence and monitoring the possible soft-error on real time. It has great contribution to the reliability of software.

Key words: Petri net, data fusion, integrated positioning systems, fault tree

摘要： 组合导航定位系统是智能交通系统中的重要组成部分，它综合运用微电子技术、数字信号处理技术等，通过最优滤波和数据融合得到连续可靠的定位数据.因为需要采集多个传感器的数据对时序控制要求严格，因此系统采用具有反馈设计的时间Petri网方法对软件流程进行动态监测和实时分析，大大提高了软件运行的可靠性.

关键词: Petri网, 数据融合, 组合定位, 故障树