基于证据推理的GNSS交通应用脆弱性评估

Assessment of GNSS Vulnerability on Transportation Based on D-S Evidence Theory

车载导航系统是GNSS(全球导航卫星系统)系统的一个重要应用,车辆接收GNSS信号在众多场景下均会受到干扰,这些干扰构成脆弱性因素。提出了一套GNSS脆弱性评估方法,从接收端定义了3个指标,借助D-S证据理论将3个指标融合成为"脆弱性指数",得到了定量的脆弱性评估方案;通过在车辆上装载不同的接收机,在坡道、林荫道、隧道等典型路段采集数据,利用实验数据对评估方案进行验证;实验结果表明,融合后的"脆弱性指数"能够定量、准确地反映系统的脆弱性,方案填补了道路上车载导航系统脆弱性定量评估的空白。

Vehicle navigation system is an important application of GNSS（global navigation satellite system）.GNSS signals received by vehicle are disturbed in many scenes,and these interferences constitute vulnerabilities.A series of GNSS vulnerability assessment methods are proposed,three metrics from the user segment are defined and a quantitative assessment result is acquired by fusing them through D-S theory.An experiment is conducted to collect navigation data on various kinds of roads.It shows that the fused metric can assess vulnerability of system quantitatively and correctly.