基于倒谱的MLS抗多径干扰算法研究  

A Novel Algorithm for Multipath Interference Suppression in MLS Based on Cepstrum

作　　者：陈雅蓉[1] 郭英[1] 吴泉城 

机构地区：[1]空军工程大学信息与导航学院,陕西西安710077 [2]总装南京军代局,江苏南京210024

出　　处：《雷达科学与技术》2014年第4期423-426,431,共5页Radar Science and Technology

基　　金：国家航空基金(No.20112096016)

摘　　要：机场周边复杂的电磁反射环境引起的多径效应降低了微波着陆系统的导航精度,严重影响飞机着陆安全。以往的抗多径干扰方法多是基于场地环境的电磁建模实现,存在计算量大、设计复杂等问题。为了有效抑制多径干扰的影响,提出了一种对机载导航设备接收的脉冲信号直接进行数字处理的方法,在倒谱域进行信号分析检测,直接抵消多径干扰的影响,估算出往、返扫描脉冲的时延差,从而实现进近飞机角度位置的精确计算。仿真结果表明,该方法能够有效抑制多径干扰引起的微波着陆系统的测角误差。The multipath effect resulted from the complicated electromagnetic environment around the airport reduces the navigational accuracy of microwave landing system, which threatens the landing security of planes seriously. But the previous multipath interference suppression methods are realized mostly on the electromagnetic modeling of the airport environment, which have the problems of huge computation and complicated design. A data processing method is proposed to process the pulse signal received by the avionics of the approaching airplane. The multipath effect is counterbalanced by using cepstrum technology and the time delay of the to and fro scanning beams is estimated directly. Thus the accurate navigation of microwave landing system is achieved. It is proved by the simulation result that the angle error of the measurement caused by the multipath can be suppressed effectively.

关 键 词：微波着陆系统 时基扫描波束 多径干扰 倒谱 时延估计 

分 类 号：TN961[电子电信—信号与信息处理]