De-distorting ionospheric effects in the image plane
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The Earth's ionosphere refracts radio waves incident on an interferometer, resulting in shifts to the measured positions of radio sources. We present a method to smoothly remove these shifts and restore sources to their reference positions, in both the catalogue and image domains. The method is applicable to instruments and ionospheric weather such that all antennas see the same ionosphere. The method is generalisable to repairing any sparsely-sampled vector field distortion to some input data. The code is available under the Academic Free License1from https://github.com/nhurleywalker/fits_warp.
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Ionospheric Modelling using GPS to Calibrate the MWA. I: Comparison of First Order Ionospheric Effects between GPS Models and MWA ObservationsArora, 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. (2015)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. The first-order ionosphere manifests itself as a ...
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Ionosphere Augmentation for Accelerated Convergence in Precise Point Positioning with Triple-frequency and GPSDeo, Manoj; El-Mowafy, Ahmed (2017)A Precise Point Positioning (PPP) method is presented that uses raw triple-frequency GPS measurements augmented with a regional ionospheric model (RIM) for faster solution convergence. The proposed method has two ...