HF channel sounding with polyphase CAZAC sequences

An alternative to the frequency modulated continuous wave (FMCW) or 'chirp' channel sounder is presented. The suggested coded pulse sounder employs polyphase constant amplitude zero auto-correlation (CAZAC) sequences as opposed to the more commonly used maximal-length pseudo noise (PN) sequences. This paper presents techniques for extracting HF ionospheric layer height (or 'range') and velocity data using the coded pulse technique. The validity of the proposed channel sounder is verified by computer simulation.<
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