空地目标分类是机载预警雷达地面目标过滤的关键步骤，可以有效改善目标航迹质量。在充分利用目标航迹信息和地面道路信息的基础上，研究了一种基于航迹与道路相似度的空地目标分类方法。首先，设计了一种将目标滤波点迹匹配到路段的快速算法，筛选出用于后续分类的路段;然后在含有曲线路段的情况下，计算目标航迹与道路的平均距离及相关系数;最后依据门限判决和滑窗处理来完成两类目标的分类。仿真结果表明，该方法在不同目标航迹分布情况下均能正确实现空地目标的分类。

Air/ground target classification is a key step for ground target filtering in airborne early warning radarwhich can improve the quality of target track effectively.On the basis of exploiting target track information and ground road informationa method for air/ground target classification based on similarity of track and road was proposed.Firsta fast arithmetic matching target filtering plot to a section of road was givenwhich could choose the roads used to classify air targets and ground targets subsequently.Thento the roads with windingaverage distance and correlation coefficient between target track and road were calculated out.Finallytarget classification was completed according to threshold decision and sliding window processing.The simulation results show that the method can implement air target and ground target classification accurately for different types of target track distribution.