Ionospheric imaging in Africa

Alex T. Chartier, Joe Kinrade, Cathryn N. Mitchell, Julian A R Rose, David R. Jackson, Pierre Cilliers, John Bosco Habarulema, Zama Katamzi, Lee Anne McKinnell, Tshimangadzo Matamba, Ben Opperman, Nicholas Ssessanga, Nigussie Mezgebe Giday, Vumile Tyalimpi, Giorgiana De Franceschi, Vincenzo Romano, Carlo Scotto, Riccardo Notarpietro, Fabio Dovis, Eugene Avenant & 11 others Richard Wonnacott, Elijah Oyeyemi, Ayman Mahrous, Gizaw Mengistu Tsidu, Harvey Lekamisy, Joseph Ouko Olwendo, Patrick Sibanda, Tsegaye Kassa Gogie, Babatunde Rabiu, Kees De Jong, Adekola Adewale

    Research output: Contribution to journalArticle

    8 Citations (Scopus)

    Abstract

    Accurate ionospheric specification is necessary for improving human activities such as radar detection, navigation, and Earth observation. This is of particular importance in Africa, where strong plasma density gradients exist due to the equatorial ionization anomaly. In this paper the accuracy of three-dimensional ionospheric images is assessed over a 2 week test period (2-16 December 2012). These images are produced using differential Global Positioning System (GPS) slant total electron content observations and a time-dependent tomography algorithm. The test period is selected to coincide with a period of increased GPS data availability from the African Geodetic Reference Frame (AFREF) project. A simulation approach that includes the addition of realistic errors is employed in order to provide a ground truth. Results show that the inclusion of observations from the AFREF archive significantly reduces ionospheric specification errors across the African sector, especially in regions that are poorly served by the permanent network of GPS receivers. The permanent network could be improved by adding extra sites and by reducing the number of service outages that affect the existing sites. Key Points Ionospheric image quality in Africa is assessed Simulated and real data are both used An extended receiver network greatly improves accuracy

    Original languageEnglish
    Pages (from-to)19-27
    Number of pages9
    JournalRadio Science
    Volume49
    Issue number1
    DOIs
    Publication statusPublished - 2014

    Fingerprint

    ionospherics
    Global positioning system
    Global Positioning System
    Imaging techniques
    GPS
    Specifications
    specifications
    DGPS
    receivers
    Plasma density
    radar detection
    Outages
    Image quality
    tomography
    Ionization
    Tomography
    ground truth
    navigation
    Navigation
    Radar

    All Science Journal Classification (ASJC) codes

    • Condensed Matter Physics
    • Electrical and Electronic Engineering
    • Earth and Planetary Sciences(all)

    Cite this

    Chartier, A. T., Kinrade, J., Mitchell, C. N., Rose, J. A. R., Jackson, D. R., Cilliers, P., ... Adewale, A. (2014). Ionospheric imaging in Africa. Radio Science, 49(1), 19-27. https://doi.org/10.1002/2013RS005238
    Chartier, Alex T. ; Kinrade, Joe ; Mitchell, Cathryn N. ; Rose, Julian A R ; Jackson, David R. ; Cilliers, Pierre ; Habarulema, John Bosco ; Katamzi, Zama ; McKinnell, Lee Anne ; Matamba, Tshimangadzo ; Opperman, Ben ; Ssessanga, Nicholas ; Giday, Nigussie Mezgebe ; Tyalimpi, Vumile ; Franceschi, Giorgiana De ; Romano, Vincenzo ; Scotto, Carlo ; Notarpietro, Riccardo ; Dovis, Fabio ; Avenant, Eugene ; Wonnacott, Richard ; Oyeyemi, Elijah ; Mahrous, Ayman ; Tsidu, Gizaw Mengistu ; Lekamisy, Harvey ; Olwendo, Joseph Ouko ; Sibanda, Patrick ; Gogie, Tsegaye Kassa ; Rabiu, Babatunde ; Jong, Kees De ; Adewale, Adekola. / Ionospheric imaging in Africa. In: Radio Science. 2014 ; Vol. 49, No. 1. pp. 19-27.
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    abstract = "Accurate ionospheric specification is necessary for improving human activities such as radar detection, navigation, and Earth observation. This is of particular importance in Africa, where strong plasma density gradients exist due to the equatorial ionization anomaly. In this paper the accuracy of three-dimensional ionospheric images is assessed over a 2 week test period (2-16 December 2012). These images are produced using differential Global Positioning System (GPS) slant total electron content observations and a time-dependent tomography algorithm. The test period is selected to coincide with a period of increased GPS data availability from the African Geodetic Reference Frame (AFREF) project. A simulation approach that includes the addition of realistic errors is employed in order to provide a ground truth. Results show that the inclusion of observations from the AFREF archive significantly reduces ionospheric specification errors across the African sector, especially in regions that are poorly served by the permanent network of GPS receivers. The permanent network could be improved by adding extra sites and by reducing the number of service outages that affect the existing sites. Key Points Ionospheric image quality in Africa is assessed Simulated and real data are both used An extended receiver network greatly improves accuracy",
    author = "Chartier, {Alex T.} and Joe Kinrade and Mitchell, {Cathryn N.} and Rose, {Julian A R} and Jackson, {David R.} and Pierre Cilliers and Habarulema, {John Bosco} and Zama Katamzi and McKinnell, {Lee Anne} and Tshimangadzo Matamba and Ben Opperman and Nicholas Ssessanga and Giday, {Nigussie Mezgebe} and Vumile Tyalimpi and Franceschi, {Giorgiana De} and Vincenzo Romano and Carlo Scotto and Riccardo Notarpietro and Fabio Dovis and Eugene Avenant and Richard Wonnacott and Elijah Oyeyemi and Ayman Mahrous and Tsidu, {Gizaw Mengistu} and Harvey Lekamisy and Olwendo, {Joseph Ouko} and Patrick Sibanda and Gogie, {Tsegaye Kassa} and Babatunde Rabiu and Jong, {Kees De} and Adekola Adewale",
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    Chartier, AT, Kinrade, J, Mitchell, CN, Rose, JAR, Jackson, DR, Cilliers, P, Habarulema, JB, Katamzi, Z, McKinnell, LA, Matamba, T, Opperman, B, Ssessanga, N, Giday, NM, Tyalimpi, V, Franceschi, GD, Romano, V, Scotto, C, Notarpietro, R, Dovis, F, Avenant, E, Wonnacott, R, Oyeyemi, E, Mahrous, A, Tsidu, GM, Lekamisy, H, Olwendo, JO, Sibanda, P, Gogie, TK, Rabiu, B, Jong, KD & Adewale, A 2014, 'Ionospheric imaging in Africa', Radio Science, vol. 49, no. 1, pp. 19-27. https://doi.org/10.1002/2013RS005238

    Ionospheric imaging in Africa. / Chartier, Alex T.; Kinrade, Joe; Mitchell, Cathryn N.; Rose, Julian A R; Jackson, David R.; Cilliers, Pierre; Habarulema, John Bosco; Katamzi, Zama; McKinnell, Lee Anne; Matamba, Tshimangadzo; Opperman, Ben; Ssessanga, Nicholas; Giday, Nigussie Mezgebe; Tyalimpi, Vumile; Franceschi, Giorgiana De; Romano, Vincenzo; Scotto, Carlo; Notarpietro, Riccardo; Dovis, Fabio; Avenant, Eugene; Wonnacott, Richard; Oyeyemi, Elijah; Mahrous, Ayman; Tsidu, Gizaw Mengistu; Lekamisy, Harvey; Olwendo, Joseph Ouko; Sibanda, Patrick; Gogie, Tsegaye Kassa; Rabiu, Babatunde; Jong, Kees De; Adewale, Adekola.

    In: Radio Science, Vol. 49, No. 1, 2014, p. 19-27.

    Research output: Contribution to journalArticle

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    AU - Kinrade, Joe

    AU - Mitchell, Cathryn N.

    AU - Rose, Julian A R

    AU - Jackson, David R.

    AU - Cilliers, Pierre

    AU - Habarulema, John Bosco

    AU - Katamzi, Zama

    AU - McKinnell, Lee Anne

    AU - Matamba, Tshimangadzo

    AU - Opperman, Ben

    AU - Ssessanga, Nicholas

    AU - Giday, Nigussie Mezgebe

    AU - Tyalimpi, Vumile

    AU - Franceschi, Giorgiana De

    AU - Romano, Vincenzo

    AU - Scotto, Carlo

    AU - Notarpietro, Riccardo

    AU - Dovis, Fabio

    AU - Avenant, Eugene

    AU - Wonnacott, Richard

    AU - Oyeyemi, Elijah

    AU - Mahrous, Ayman

    AU - Tsidu, Gizaw Mengistu

    AU - Lekamisy, Harvey

    AU - Olwendo, Joseph Ouko

    AU - Sibanda, Patrick

    AU - Gogie, Tsegaye Kassa

    AU - Rabiu, Babatunde

    AU - Jong, Kees De

    AU - Adewale, Adekola

    PY - 2014

    Y1 - 2014

    N2 - Accurate ionospheric specification is necessary for improving human activities such as radar detection, navigation, and Earth observation. This is of particular importance in Africa, where strong plasma density gradients exist due to the equatorial ionization anomaly. In this paper the accuracy of three-dimensional ionospheric images is assessed over a 2 week test period (2-16 December 2012). These images are produced using differential Global Positioning System (GPS) slant total electron content observations and a time-dependent tomography algorithm. The test period is selected to coincide with a period of increased GPS data availability from the African Geodetic Reference Frame (AFREF) project. A simulation approach that includes the addition of realistic errors is employed in order to provide a ground truth. Results show that the inclusion of observations from the AFREF archive significantly reduces ionospheric specification errors across the African sector, especially in regions that are poorly served by the permanent network of GPS receivers. The permanent network could be improved by adding extra sites and by reducing the number of service outages that affect the existing sites. Key Points Ionospheric image quality in Africa is assessed Simulated and real data are both used An extended receiver network greatly improves accuracy

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    Chartier AT, Kinrade J, Mitchell CN, Rose JAR, Jackson DR, Cilliers P et al. Ionospheric imaging in Africa. Radio Science. 2014;49(1):19-27. https://doi.org/10.1002/2013RS005238