Measured ionospheric distortion of HF ground-backscatter spectra

Jones, R. M.; Georges, T. M.; Riley, Joseph L.

doi:10.1109/tap.1986.1143842

Cited by 5 publications

(3 citation statements)

References 11 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In either case, the resulting ionospheric contamination of the received signal is a potentially severe problem affecting the performance of land-based high-frequency (HF) surface wave radar systems operating in an ocean environment [2], especially during nighttime operation. Recently, much effort has been put into reducing the ionospheric clutter [3]- [6].…”

Section: Introductionmentioning

confidence: 99%

On the Development of a High-Frequency Radar Cross Section Model for Mixed Path Ionosphere–Ocean Propagation

Walsh

Gill

Huang

et al. 2015

IEEE Trans. Antennas Propagat.

View full text Add to dashboard Cite

An analytic high-frequency (HF) radar cross section model for ionosphere-ocean propagation is presented. Based on earlier work, an expression for the first-order received electric field after a single scatter from each of the ionosphere and sea surface is derived and reduced to integral form. The field integrals are taken to the time domain, with the source field being that of a vertically polarized pulsed dipole antenna. Subsequently, the first-order radar cross section for the mixed path mode of ionospheric clutter is developed. The ionosphere reflection coefficient used in the analysis is assumed to be a stochastic process with an associated spectral density function to account for phase variations along the surface associated with nonuniformity of the signal path. Simulation results for the new cross section are also provided. It is shown numerically that the expected magnitude of the ionosphere clutter, under reasonable assumptions, exceeds the dominant first-order ocean clutter for the same apparent range by 50-60 dB. Further, it is spread in Doppler, depending on the ionosphere horizontal velocity and reflecting path nonuniformity. Also, this component can be presented from a certain minimum range, depending on ionosphere virtual height, to the maximum radar range.

show abstract

Section: Introductionmentioning

confidence: 99%

On the Development of a High-Frequency Radar Cross Section Model for Mixed Path Ionosphere–Ocean Propagation

Walsh

Gill

Huang

et al. 2015

IEEE Trans. Antennas Propagat.

View full text Add to dashboard Cite

show abstract

“…Ionospheric clutter is a severe problem affecting the performance of land based high frequency (HF) surface wave radar systems operating in an ocean environment, especially at night time [1]. During nighttime, the maximum usable frequency drops and strong reflections from the ionosphere are present in the frequency range, typically 3-5 MHz, being used with these systems.…”

Section: Introductionmentioning

confidence: 99%

An analytical model for HF radar ionospheric clutter

Walsh

Huang

Gill

2013

2013 IEEE Antennas and Propagation Society International Symposium (APSURSI)

View full text Add to dashboard Cite

In this paper, an analytic model for the mixed path mode of ionospheric clutter associated with high frequency surface wave radars (HFSWR) operating in an ocean environment is presented. Based on earlier work, an expression for the firstorder received electric field after a single scatter from each of the ionosphere and sea surface is derived and reduced to integral form. The integrals are taken to the time domain, with the source field being that of a vertically polarized pulsed dipole antenna. Subsequently, the first-order radar cross section for ionosphere clutter is developed. Simulation results for the new cross section are also provided. It is shown numerically that the expected magnitude of the ionosphere clutter, under reasonable assumptions, exceeds the dominant first order ocean clutter for the same apparent range by 40-50 dB. Further, it is spread over several Hertz in Doppler, depending on ionosphere horizontal velocity and reflecting path non-uniformity. Also, this component can be present from a certain minimum range, depending on ionosphere virtual height, out to the maximum radar range.

show abstract

“…Other methods exploiting spatial correlation of the ionospheric contamination can avoid this problem [7,8]. The spatial correction is in general very low even between neighboring rang bins [9], which limits the applications of these methods.…”

Section: Introductionmentioning

confidence: 99%