Search Results - "ionosphere"

Forecasting the ionospheric by Risal, Noreen Nabilla

“…One of the most important ionospheric parameters is the critical frequency of the ionospheric…”
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Ionospheric Modelling using GPS to Calibrate the MWA. II: Regional Ionospheric Modelling using GPS and GLONASS to Estimate Ionospheric Gradients by Arora, B., Morgan, J., Ord, S., Tingay, Steven, Bell, M., Callingham, J., Dwarakanath, K., For, B., Hancock, P., Hindson, L., Hurley-Walker, N., Johnston-Hollitt, M., Kapinska, A., Lenc, E., McKinley, B., Offringa, A., Procopio, P., Staveley-Smith, L., Wayth, Randall, Wu, C., Zheng, Q.

“…In previous work, the ionosphere was characterised using a single-station to model the ionosphere as a single layer of fixed height and this was compared with ionospheric data derived from radio astronomy observations obtained from the Murchison Widefield Array. …”
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Preliminary studies of the ionospheric effect from the ionospheric regions using GPS permanent tracking stations by Z., Othman, W.A., Wan Abdul Aziz, M.T., Roslina

“…The Global Positioning System signals must travel through the earth's ionosphere on their way to GPS receivers on or near the earth's surface. …”
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Ionospheric modeling for low frequency radioastronomy by Arora, Balwinder Singh Amrit Singh

“…GNSS data from ground stations close to the MRO were used to produce a model of the ionosphere. Comparisons of this model with ionospheric parameters derived from the MWA observations show good agreement. …”
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GNSS data filtering optimization for ionospheric observation by D’Angelo, G., Spogli, L., Cesaroni, C., Sgrigna, V., Alfonsi, L., Aquino, M.H.O.

Subjects: “…Ionospheric scintillations; Multipath; GNSS; Filtering technique…”
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De-distorting ionospheric effects in the image plane by Hurley-Walker, Natasha, Hancock, Paul

“…The method is applicable to instruments and ionospheric weather such that all antennas see the same ionosphere. …”
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Simulations of ionospheric refraction on radio interferometric data by Chege, J Kariuki, Jordan, Chris, Lynch, Christene, Line, Jack, Trott, Cathryn

“…This enables us to directly assess the impact of the ionosphere on observed EoR data and the resulting power spectra. …”
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On the geometry of the ambiguity search space with and without the ionosphere. by Teunissen, Peter

“…This will be done for the case the ionosphere is assumed to be present, as well as for the case the ionosphere is assumed to be absent. …”
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Ionospheric Phenomena and Low-Frequency Radio Astronomy by Herne, David, Kennewell, J., Lynch, Mervyn, Carrano, C.

Subjects: “…ionosphere…”
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Modeling and correction analysis of regional ionospheric modeling by Ji, Yuanfa, Liu, Yu, Sun, Xiyan, Guo, Ning, Zhao, Songke, Kamarul Hawari, Ghazali

“…The Global Navigation Satellite System (GNSS), due to its all-weather lobal monitoring and high precision, makes it possible to use GNSS observation data to accurately extract the total electron content (TEC) of the ionosphere and to study ionospheric activities. At the same time, the delay error caused by the ionosphere to GNSS signals is also one of the main sources of error in GNSS positioning. …”
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Professor Faizal shared ionosphere research in Malaysia by UMP, PNC

“…Professor Ir.Dr.Ahmad Faizal Mohd Zain from the Faculty of Manufacturing Engineering Universiti Malaysia Pahang (UMP) shared his expertise relating to ionosphere in a public academic talk titles, 'Electrons Making Waves in the Sky: The ionosphere and Us' at the faculty's lecture hall 1 in UMP Pekan on September 19.…”
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Modelling of ionosphere behaviour prior to large earthquakes by Rizal, Nur Awatiff Mohamad

“…This project examines the behavior of pre-earthquake ionospheric parameters by the variation in foF2 (critical frequency of F2 layer) and TEC (total electron content) from the ionosondes stations. …”
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Ionospheric Modelling using GPS to Calibrate the MWA. I: Comparison of First Order Ionospheric Effects between GPS Models and MWA Observations by Arora, B., Morgan, John, Ord, S., Tingay, Steven, Hurley-Walker, Natasha, Bell, M., Bernardi, G., Bhat, Ramesh, Briggs, F., Callingham, J., Deshpande, A., Dwarakanath, K., Ewall-Wice, A., Feng, L., For, B., Hancock, Paul, Hazelton, B., Hindson, L., Jacobs, D., Johnston-Hollitt, M., Kapinska, A., Kudryavtseva, N., Lenc, E., McKinley, B., Mitchell, D., Oberoi, D., Offringa, A., Pindor, B., Procopio, P., Riding, J., Staveley-Smith, L., Wayth, Randall, Wu, C., Zheng, Q., Bowman, J., Cappallo, R., Corey, B., Emrich, David, Goeke, R., Greenhill, L., Kaplan, D., Kasper, J., Kratzenberg, E., Lonsdale, C., Lynch, Mervyn, McWhirter, S., Morales, M., Morgan, E., Prabu, T., Rogers, A., Roshi, A., Shankar, N., Srivani, K., Subrahmanyan, R., Waterson, M., Webster, R., Whitney, A., Williams, A., Williams, A.

“…Copyright © Astronomical Society of Australia 2015 We compare first-order (refractive) ionospheric effects seen by the MWA with the ionosphere as inferred from GPS data. …”
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Mitigation of ionospheric effects on GNSS positioning at low latitudes by Park, J., Vadakke Veettil, Sreeja, Aquino, Marcio, Yang, Lei, Cesaroni, Claudio

“…Ionospheric conditions at low latitudes are extremely harsh due to the frequent occurrence of scintillation and the presence of strong TEC gradients. …”
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GPS-BASED IONOSPHERE MODELING: A BRIEF REVIEW by Alcay, S., Yigit, Cemal Ozer, Seemala, G., Ceylan, A.

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GPS-based ionosphere modeling: A brief review by Alcay, S., Yigit, Cemal Ozer, Seemala, G., Ceylan, A.

“…Various methods have been proposed for modeling the ionosphere since 1970. In recent years, GPS is used in ionosphere modeling studies extensively. …”
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The effect of the ionosphere on astronomical observations below 100 MHz by De Gasperin, F., Mevius, M., Intema, Hubertus

“…We derive the expected systematic error induced by the ionosphere on radio astronomical observations at low frequencies. …”
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The ionosphere weighted GPS baseline precision in canonical form by Teunissen, Peter

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Waves in the sky: Probing the ionosphere with the Murchison Widefield Array by Loi, S., Murphy, T., Cairns, I., Trott, Cathryn, Bell, M., Hurley-Walker, Natasha, Morgan, John, Lenc, E., Offringa, A., Menk, F., Waters, C., Feng, L., Hancock, Paul, Kaplan, D., Kudryavtseva, N., Lonsdale, C., Erickson, P., Coster, A., Ekers, R., Bernardi, G., Bowman, J., Briggs, F., Cappallo, R., Deshpande, A., Gaensler, B., Greenhill, L., Hazelton, B., Johnston-Hollitt, M., McWhirter, S., Mitchell, D., Morales, M., Morgan, E., Oberoi, D., Ord, S., Prabu, T., Shankar, N., Srivani, K., Subrahmanyan, R., Tingay, Steven, Wayth, Randall, Webster, R., Williams, Andrew, Williams, C.

“…Low-frequency, wide-field radio telescopes such as the Murchison Widefield Array (MWA) enable the dense spatial sampling of the ionosphere and plasmasphere on regional scales. For a physically compact array such as the MWA, the refractive shifts in the positions of celestial sources in the synthesised radio images are proportional to spatial gradients in the total electron content (TEC) transverse to the line of sight. …”
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Ionospheric correction and ambiguity resolution in DGPS with single frequency. by Ya’acob, Norsuzila, Abdullah, Mardina, Ismail, Mahamod, Jusoff, Kamaruzaman

“…In this study, the effects of initial phase ambiguity at GPS and modeling of ionosphere on base components were researched. To overcome this problem, a correction ionospheric model was used. …”
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