Estimation of ionospheric layer heights and velocities using available DRM signals
Estimation of ionospheric layer heights and velocities using available DRM signals
- Author(s): M.J. Underhill
- DOI: 10.1049/cp.2012.0398
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- Author(s): M.J. Underhill Source: 12th IET International Conference on Ionospheric Radio Systems and Techniques (IRST 2012), 2012 page ()
- Conference: 12th IET International Conference on Ionospheric Radio Systems and Techniques (IRST 2012)
- DOI: 10.1049/cp.2012.0398
- ISBN: 978-1-84919-623-9
- Location: York, UK
- Conference date: 15-17 May 2012
- Format: PDF
The spectrum time `waterfall' of a received DRM (Digital Radio Mondiale) signal contains information about the ionosphere around the half-way point of the path between transmitter and receiver. Typical DRM signals have a flat-topped spectrum that is 9kHz or 10kHz wide. The most easily observed patterns in the spectra are caused by multipath interference mainly between one-hop and two-hop paths. The path difference is then a maximum of twice the effective layer height and a minimum of 87% of this. Half the path difference and hence the approximate layer height in km is 15 times the number of cycles of the interference pattern observed in a 10 kHz Bandwidth. Layer and aircraft reflection velocities can also be extracted from the DRM signal `waterfall'. “DRM Passive ionospheric Sounding, or DPS” is shown to be feasible. (5 pages)
Inspec keywords: radiofrequency interference; digital radio; ionospheric techniques; radio receivers; software radio
Subjects: Atmospheric, ionospheric and magnetospheric techniques and equipment; Radio links and equipment; Electromagnetic compatibility and interference; Radiowave and rocket soundings of the ionosphere
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