Mitigation of time-varying spectral nulls in a wideband HF signal

被引：0
|
作者：
Daly, Michael [1 ]
Allen, Jeffery [1 ]
Wojtaszek, Tomasz [1 ]
Ontiveros, Marcos [1 ]
机构：
[1] SPAWAR Syst Ctr Pacific, San Diego, CA 92152 USA
来源：
2017 IEEE INTERNATIONAL SYMPOSIUM ON ANTENNAS AND PROPAGATION & USNC/URSI NATIONAL RADIO SCIENCE MEETING | 2017年
关键词：
D O I：
暂无
中图分类号：
TM [电工技术]; TN [电子技术、通信技术];
学科分类号：
0808 ; 0809 ;
摘要：
Multiple and time-varying spectral nulls have been observed in wideband HF-NVIS channel. These nulls cause rapid fading in narrowband HF-NVIS links.. This paper offers one physical explanation of these observations-the rapid fading is caused by interference between the ordinary (O mode) and extraordinary (X mode) waves carrying the signal in opposite sense polarization at the receiver. This explanation points to a mitigation scheme: coherently combine dual-polarization receive antennas to eliminate the nulls.
引用
收藏
页码：1623 / 1624
页数：2
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