Techniques for the measurement and decomposition of the time varying narrow bandwidth transfer function of an HF sky wave transmission

被引：4

作者：

Baker, PW

Clarke, RH

Massie, AD

Taylor, D

机构：

[1] Communications Division, Def. Sci. and Technol. Organisation, Salisbury, SA

[2] Department of Defence, Def. Sci. and Technol. Organisation, Electronics Research Laboratory, Salisbury, SA 5018

来源：

RADIO SCIENCE | 1997年 / 32卷 / 05期

关键词：

D O I：

10.1029/96RS03279

中图分类号：

P1 [天文学];

学科分类号：

0704 [天文学];

摘要：

A technique is presented for the measurement and decomposition into component propagation modes of the time varying narrow bandwidth (10 kHz) transfer function of an HF sky wave frequency modulated continuous wave (FMCW) transmission at 15.085 MHz. One event on a 5244-km transmission path which exhibited nonselective fading within the 10-kHz bandwidth is analyzed and found to exhibit severe phase distortion due to multipath. A component transfer function for an individual propagation mode is also obtained by two-dimensional filtering of the signal in the Doppler frequency-time delay domain, resulting in a significant reduction in phase distortion. The filtering technique can be used on FMCW transmissions with a repetitive waveform for the time varying identification and measurement of component multipath modes with unresolvable group time delay differences.

引用

页码：1813 / 1820

页数：8