电波科学学报2025，Vol.40Issue(2)：323-330,8.DOI:10.12265/j.cjors.2024059
短波信道衰落条件下的极化敏感天线接收性能分析
Reception performance analysis of polarimetric antennas in the HF fading channel
摘要
Abstract
The high-frequency(HF)polarimetric antennas reduce channel fading in applications such as over-the-horizon(OTH)radar and diversity reception systems.Polarimetric antennas can be equipped with different numbers and types of antenna elements and polarization diversity is required in antenna design to evaluate reception performance in the HF fading channel,i.e.,the channel with time-varying wave direction,polarization,and the possible presence of multi-paths.However,it is difficult to generate ground waves with time-varying fading,and multi-paths in the time-varying sky wave impede direct polarization diversity.Communication or OTH radar signals help to resolve multi-paths but require computationally intensive steps such as channel equalization or pulse compression.A simple and reliable method is proposed to address this problem using the sky wave,which is based on the maximal-ratio-combining(MRC)of multipath sine waves.Multi-paths of the sine wave are correlated with each other and can be viewed as synthesized into a sine wave in a short time,and the performance of antennas can then be compared by the output signal-to-noise ratio(SNR)of the MRC.Simulation validates the proposed method and an experiment over a link length of about 700 km further compares typical polarimetric antennas that have 2 or 3 elements.The simulation shows that the antenna with 2 orthogonal elements significantly outperforms the 1 linear wire antenna and approaches the performance of the antenna with 3 elements as the elevation angle increases.The experiment shows similar results with unknown and time-varying elevation angles.关键词
极化敏感天线/短波信道衰落/接收性能分析/最大比合并(MRC)/正弦波Key words
polarimetric antennas/HF fading channel/reception performance analysis/maximal-ratio-combining(MRC)/sine wave分类
电子信息工程引用本文复制引用
唐文岐,瞿文中,李天昀,游凌,辛吉荣,杨松桥,杜政东,赵菲..短波信道衰落条件下的极化敏感天线接收性能分析[J].电波科学学报,2025,40(2):323-330,8.基金项目
国家重点研发计划(2023YFA1009100) （2023YFA1009100）
