摘要
广播式自动相关监视作为国际民航组织主推的监视技术,近年来受到了广泛关注,越来越多的飞行器配备了ADS-B收发设备。介于ADS-B信号的广播体制以及空域流量的不断增加,不同的ADS-B信号之间不可避免会发生交织;而信号交织会给ADS-B信号的解码带来严重影响,进而造成信息的错误读取或丢失。针对上述问题,本文提出了一种单天线下基于累加判决的解交织算法:首先通过单天线下的有效脉冲位置检测以及基于希尔伯特变换的交织检测分别获得信号的起始位置以及信号交织位置,进而得到两条信号之间的相对时延,从而对数据进行累加并利用K-means方法进行分类,最终得到比特位判决结果以实现交织信号分离;针对已有的解交织算法进行了比较,验证本文所提算法在交织信号之间存在一定功率差时有着良好的分离效果。
As a major surveillance technique in the future recommended by ICAO, Automatic Dependent Surveillance- Broadcast （ADS-B） is being paid much more attention in the world, it is incorporated to the growing number of aircraft. As the broadcast property and the increasing of the aircraft, there will be overlapping among the different ADS-B signal, which will lead to a serious problem for the decoding of ADS-B signals. If the ADS-B signal cannot be properly decoded, the in- formation of target will be lost or error recorded. In this paper, the method of overlapped signal processing is presented for single-antenna ADS-B receiver. Firstly, this paper estimate the start time of the signal by the detection of valid pulse posi- tion and lead edge, the overlapping position is detected by Hilbert transform, then the time delay between the overlapped signals is obtained; secondly, divide the sample points into intervals based on the estimated time delay and the pulse width, and the signal power on each interval can be obtained by adopting step by step integration. Finally, the data of dif- ferent signal can be determined by the classification results of integral values. The method is compared with those of the presented approaches, the result of the simulation shows that if there is a certain power difference between the overlapping signals, then the separation is effective.
出处
《信号处理》
CSCD
北大核心
2017年第4期572-576,共5页
Journal of Signal Processing
基金
国家重点研发计划项目(2016YFB0502402)
关键词
广播式自动相关监视
交织干扰
信号分离
automatic dependent surveillance-broadcast （ADS-B）
overlapping interference
signal separation
作者简介
吴仁彪 男，1966年生，湖北武汉人。博士，教授，博士生导师，IEEE高级会员．民航特聘专家，中国民航大学，主要研究方向为自适应信号处理、高分辨率雷达成像与自动目标识别、民航无线电干扰检测与自适应抑制、民航遥感信息处理与应用。E-mail：rbwu@rip．163．com
吴琛琛 男，1992年生，山东东营人。中国民航大学电子信息与自动化学院硕士研究生，主要研究方向为信号处理，目前从事广播式自动相关监视信号处理方面的研究。E-mail：ccwu1992@163．com
王文益 男，1980年生，湖北人。博士，中国民航大学教授，硕士生导师。主要从事自适应信号处理、卫星导航、无线电通信等领域的研究工作。E-mail：wenyiwang@126．com
