On the spectral width of chirpsounder signals

Lundborg, Bengt; Lundgren, M

doi:10.1016/0021-9169(92)90010-i

Cited by 16 publications

(2 citation statements)

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“…To date, several approximate theoretical methods have been developed to model the chirpsounder operations [1][2]4]. One of the approaches, as discussed in [3] and further developed in [5,6], bases its methodology in systematic formal examination of the impact produced by the ionospheric radiochannel and the chirpsounder receiver circuitry on the sounding FMCW signal.…”

Section: Window Processing Of the Fmcw Signalmentioning

confidence: 99%

“…The principle of the method is that the radiated FMCW signal is divided into narrow-band components using the theory of ionospheric propagation of narrow-band pulses. Another approach has been reported in [2]. The transfer function of the ionospheric radiochannel was represented as a set of transfer functions, each of which was expanded into a Taylor series in the neighborhoods of central frequencies; the passing of the transmitted signal through each transfer function was considered separately.…”

Section: Introductionmentioning

confidence: 99%

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Theoretical Investigation of the Ultrawideband FMCW Signal Propagation Through Ionospheric Radiochannel

Ilyin

Khakhinov

2006

2006 3rd International Conference on Ultrawideband and Ultrashort Impulse Signals

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A theoretical description is given to the chirpsounder operation configuration in the mode of sounding the ionospheric radiochannel by the ultrawideband frequencymodulated continuous wave (FMCW) signal. A preprocessing of the received signal is carried out using the frequency-compression method. It is shown that the result derived from processing an individual time sample is mathematically equivalent to a sounding of the radio channel by a complex-valued narrow-band impulse signal. Analysis of both in-phase and quadrature components of received FMCW signal at the output of intermediate frequency (IF) band-pass filter of the chirpsounder demonstrates a new possibility of recovering the transfer function of the HF radiochannel within the band of operating frequencies and the interval of time delays that are defined by the IF filter characteristics.

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