Ionospheric Modelling using GPS to Calibrate the MWA. I: Comparison of First Order Ionospheric Effects between GPS Models and MWA Observations
Ionospheric Modelling using GPS to Calibrate the MWA. I: Comparison of First Order Ionospheric Effects between GPS Models and MWA Observations
复制标题
使用 GPS 进行电离层建模来校准 MWA。
DOI：
--
复制
发表时间：
2015
期刊：
影响因子：
--
通讯作者：
And C L Williams
中科院分区：
文献类型：
--
作者：
B. Arora;J. Morgan;S. Ord;S. Tingay;N. Hurley;M. Bell;G. Bernardi;G. Bernardi;N. Bhat;Frank H. Briggs;J. Callingham;J. Callingham;Avinash A. Deshpande;K. Dwarakanath;A. Ewall;Lu Feng;B. For;P. Hancock;B. Hazelton;L. Hindson;D. Jacobs;M. Johnston;A. Kapinska;N. Kudryavtseva;E. Lenc;B. McKinley;D. Mitchell;D. Mitchell;D. Oberoi;A. Offringa;B. Pindor;P. Procopio;J. Riding;L. Staveley;R. Wayth;Chen Wu;Q. Zheng;J. Bowman;R. Cappallo;B. Corey;D. Emrich;R. Goeke;L. Greenhill;D. Kaplan;J. C. Kasper;J. C. Kasper;E. Kratzenberg;C. Lonsdale;M. Lynch;S. McWhirter;M. Morales;E. Morgan;T. Prabu;A. Rogers;A. Roshi;N. Shankar;K. Srivani;R. Subrahmanyan;M. Waterson;R. Webster;A. Whitney;A. Williams;And C L Williams
摘要我们比较了MWA与GPS数据推断的电离层的一阶（折射）电离层效应。一阶电离层表现为在MWA视场中观测到的源的整体位置偏移。这些影响可以根据GPS分析中心（即CODE）提供的全球电离层地图来计算。然而，对于精密射电天文学应用，来自当地全球定位系统网络的数据需要纳入电离层建模。对于全球定位系统观测，电离层参数会因全球定位系统接收器仪器延迟等因素而产生偏差，这些因素也称为接收器DCB。对于用于电离层建模的任何非CODE全球定位系统台站，都需要估计接收器DCB。在这项工作中，单GPS站为基础的电离层建模进行时间分辨率为10分钟。还接收器DCB估计选定的地球科学澳大利亚GPS接收器，位于默奇森无线电天文台，Yarragadee，磁铁山和维卢纳。比较了由GPS估算的电离层梯度和由MWA推算的电离层梯度。所有GPS台站的电离层梯度都与微波辐射计观测到的梯度相关。利用全球定位系统测量获得的电离层估计值显示出为微波辐射计提供校准信息的前景。
Abstract 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 bulk position shift of the observed sources across an MWA field of view. These effects can be computed from global ionosphere maps provided by GPS analysis centres, namely the CODE. However, for precision radio astronomy applications, data from local GPS networks needs to be incorporated into ionospheric modelling. For GPS observations, the ionospheric parameters are biased by GPS receiver instrument delays, among other effects, also known as receiver DCBs. The receiver DCBs need to be estimated for any non-CODE GPS station used for ionosphere modelling. In this work, single GPS station-based ionospheric modelling is performed at a time resolution of 10 min. Also the receiver DCBs are estimated for selected Geoscience Australia GPS receivers, located at Murchison Radio Observatory, Yarragadee, Mount Magnet and Wiluna. The ionospheric gradients estimated from GPS are compared with that inferred from MWA. The ionospheric gradients at all the GPS stations show a correlation with the gradients observed with the MWA. The ionosphere estimates obtained using GPS measurements show promise in terms of providing calibration information for the MWA.