On the shape of measured spectra of the ionosphere sounding by an FMCW signal under dispersion case

Davydenko, M. A.; Ilyin, N. V.; Khakhinov, Vitaliy

doi:10.1016/s1364-6826(02)00196-7

Cited by 8 publications

(9 citation statements)

References 4 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The calculated dispersion distortions of individual recorded spectra S k (Ω) as functions of the groupdelay dispersion, the time-window length, and the frequency show good agreement with the experimental data obtained at the chirp ionosonde of the Institute for Solar-Terrestrial Physics of the Siberian Branch of the Russian Academy of Sciences (Irkutsk, Russia) [15].…”

Section: Theoretical Modeling Of the Chirp-ionosonde Operation Duringsupporting

confidence: 76%

“…One of the problems solved by theoretical modeling is the study of dispersion distortions of wideband signals in HF radio channels [11,12,14,15]. Another problem is the reconstruction of the transfer function (impulse response) of the sounded radio channel [9,16].…”

Section: Theoretical Modeling Of the Chirp-ionosonde Operation Duringmentioning

confidence: 99%

“…One method developed in [13,15] is based on the consistent formal consideration of how the chirp signal is influenced by the ionospheric radio channel and technical devices operating in the ionosonde receiving part and participating in primary processing by the frequency-compression method. The transfer function is determined by the parameters of all the radio-channel parts, i.e., the transmitter, transceiver antenna-feeder devices, the ground surface, and the ionosphere.…”

Section: Theoretical Modeling Of the Chirp-ionosonde Operation Duringmentioning

confidence: 99%

“…In [13,15], the calculated expression for the recorded spectrum is obtained and the simulation modeling of the ionograms is performed for the chirp sounding of the ionospheric HF Magadan-Irkutsk radio channel. Within the framework of the developed approach, we propose a method for reconstructing the transfer function of the radio channel during the chirp sounding of the ionosphere.…”

Section: Theoretical Modeling Of the Chirp-ionosonde Operation Duringmentioning

confidence: 99%

“…We presented a brief description of operation of the chirp ionosonde, which is completely described in [5,13,15], when a sequence of spectra of the temporal window samples of the received signal was recorded in one sounding session. Now the digital technologies allow us to record a realization of the entire chirp signal after the mixer and the bandpass filter at the intermediate frequency of the receiver.…”

Section: Mathematical Modeling Of the Signal Recording At The Intermementioning

confidence: 99%

See 4 more Smart Citations

Modeling the recorded spectrum and reconstructing the transfer function of the wideband ionospheric HF radio channel in the case of chirp sounding

Ilyin

Davydenko²,

Khakhinov

2007

Radiophys Quantum Electron

View full text Add to dashboard Cite

We model theoretically the received spectrum in the case of sounding of the ionospheric HF radio channel by a chirp signal. It is shown that the result of processing of an individual time sample of the received signal is equivalent to the sounding of the radio channel by a complex narrow-band pulsed signal such that the group delays of its propagation modes determine the maxima in the received spectrum. We analyze the quadrature components of realizations of the received signal at the intermediate frequency at the bandpass-filter output in the receiving channel of the chirp ionosonde. The results of our analysis show the possibility of reconstructing the transfer function of a HF radio channel in the sounding-frequency band for the delay range determined by the characteristics of the intermediate-frequency bandpass filter. We propose a method for reconstructing the transfer function of the ionospheric radio channel, which involves supplementing the circuit of primary processing of the signal by a corrective digital filter with specified amplitude-frequency and phase-frequency characteristics. The proposed method can be used for all operating regimes of the chirp ionosonde in the case of digital recording and processing of signals.

show abstract

Section: Theoretical Modeling Of the Chirp-ionosonde Operation Duringsupporting

confidence: 76%

Section: Theoretical Modeling Of the Chirp-ionosonde Operation Duringmentioning

confidence: 99%

Section: Theoretical Modeling Of the Chirp-ionosonde Operation Duringmentioning

confidence: 99%

Section: Theoretical Modeling Of the Chirp-ionosonde Operation Duringmentioning

confidence: 99%

Section: Mathematical Modeling Of the Signal Recording At The Intermementioning

confidence: 99%

See 3 more Smart Citations

Modeling the recorded spectrum and reconstructing the transfer function of the wideband ionospheric HF radio channel in the case of chirp sounding

Ilyin

Davydenko²,

Khakhinov

2007

Radiophys Quantum Electron

View full text Add to dashboard Cite

show abstract

Chirp Ionosonde and Its Application in the Ionospheric Research

Ivanov

Kurkin

Nosov

et al. 2003

Radiophysics and Quantum Electronics

View full text Add to dashboard Cite

A method for restoration of radio channel transfer function by chirp sounding of the ionosphere

Davydenko¹,

Ilyin²,

Khakhinov³

2008

Int. J. Geomagn. Aeron.

View full text Add to dashboard Cite

1] Analysis of both in-phase and quadrature components of received frequency-modulated continuous wave (FMCW) signal at the output of intermediate frequency (IF) band-pass filter of the chirp ionosonde demonstrates a new possibility of recovering the transfer function of the HF radio channel within the band of operating frequencies and the interval of time delays that are defined by the IF filter characteristics. The transfer function is determined by the parameters of all parts comprising the radio channel: transmitter, receiving-transmitting antenna-feeder devices, Earth surface, ionosphere, as well as the receiver circuitry participating in the signal processing. However, characteristics of all parts except the ionosphere can be considered stationary and well-known or controlled. It is the ionosphere that displays significant temporal variability. A new technique is proposed for recovering the transfer function of the ionospheric radio channel, together with its implementation as a signal preprocessing circuit containing a correcting digital filter that adapts to the current amplitude frequency and phase frequency characteristics of the channel. INDEX TERMS: 2441 Ionosphere: Ionospheric storms; 2407 Ionosphere: Auroral ionosphere; 2447 Ionosphere: Modeling and forecasting; KEYWORDS: FMCW sounder, chirp sounding technique, ionospheric radio channel, transfer function, digital signal processing. Citation: Davydenko, M. A., N. V. Ilyin, and V. V. Khakhinov (2008), A method for restoration of radio channel transfer function by chirp sounding of the ionosphere, Int.

show abstract

On the shape of measured spectra of the ionosphere sounding by an FMCW signal under dispersion case

Cited by 8 publications

References 4 publications

Modeling the recorded spectrum and reconstructing the transfer function of the wideband ionospheric HF radio channel in the case of chirp sounding

Modeling the recorded spectrum and reconstructing the transfer function of the wideband ionospheric HF radio channel in the case of chirp sounding

Chirp Ionosonde and Its Application in the Ionospheric Research

A method for restoration of radio channel transfer function by chirp sounding of the ionosphere

Contact Info

Product

Resources

About