Sideband Asymmetry in Ionospheric Cross Modulation

P. T. de Boer*, M. Vester

*Corresponding author for this work

Research output: Contribution to journalArticleAcademicpeer-review

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Abstract

We study the phenomenon of ionospheric cross modulation between LF/MF broadcast stations using modern reception techniques, allowing us to see details that were not seen with the analog receiving techniques from the 1940s. We show experimentally that the sidebands of the transferred modulation are often asymmetric, in amplitude and/or phase. We give qualitative and quantitative explanations for this asymmetry, based on taking contributions from outside the first Fresnel zone into account. The asymmetry is found to be strongest for longer paths, lower carrier frequency, and disturbing transmitter closer to the receiver.

Original languageEnglish
Pages (from-to)640-655
Number of pages16
JournalRadio Science
Volume53
Issue number5
DOIs
Publication statusPublished - May 2018

Keywords

  • Ionospheric cross modulation
  • Radio propagation

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