脉冲测距系统的多径干扰影响及消除  

The effect and elimination of multipath interference in pulse distance measuring system

作　　者：孙晔[1,2] 易克初[1] 向新[2] 王锋[1,2] 

机构地区：[1]西安电子科技大学综合业务网国家重点实验室,陕西西安710071 [2]空军工程大学航空航天工程学院,陕西西安710038

出　　处：《电子技术应用》2016年第2期28-31,共4页Application of Electronic Technique

摘　　要：由于地空无线信道的多径特性的影响,采用脉冲测距原理的机载脉冲测距系统的精度受到较大影响。在对机载脉冲测距设备原理进行深入研究的基础上,对多径干扰对脉冲测距系统的影响进行了分析,确定了最为不利的多径形态,进一步提出了一种针对多径消除的基于第一脉冲延迟译码的解决方案,并予以了工程实现。仿真结果表明该方案效果良好。Because of the influence of the multipath in air to ground wireless channel, the accuracy of pulse distance measuring system using pulse distance measuring principle is greatly affected. In this paper, the principle of DME（Distance Measuring Equipment）was deeply studied at first, the effect of multipath interference in pulse distance measuring system was analyzed carefully, the worst condition of multipath interference was confirmed. Furthermore, a novel eliminate scheme on multipath interference based on the first pulse delay decoding was presented, and the scheme was realized by FPGA. The simulation results show that the scheme is ef-fective.

关 键 词：脉冲测距系统 多径干扰 第一脉冲延迟译码 FPGA 

分 类 号：TN96[电子电信—信号与信息处理]