Comparison of NAVSTAR satellite <i>L</i> band ionospheric calibrations with Faraday rotation measurements

Royden, H. N.; Miller, R. B.; Buennagel, L. A.

doi:10.1029/rs019i003p00798

Cited by 13 publications

(6 citation statements)

References 5 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Additional locations that became available as of March 1, 1993, are denoted by a cross. 180 [Royden et al, 1984;Lanyi and Roth, 1988;Coco et al, 1991]. The method introduced by Lanyi and Roth assumes that the electron distribution lies in a thin shell at a fixed height above the Earth, and the measured ionospheric delays are modeled by a two-dimensional polynomial function of shell angular position.…”

Section: Figure L This Map Shows the Gps Receiver Locations For The mentioning

confidence: 99%

Subdaily northern hemisphere ionospheric maps using an extensive network of GPS receivers

Wilson¹,

Mannucci²,

Edwards³

1995

Radio Science

122

View full text Add to dashboard Cite

Ionospheric total electron content (TEC) data derived from dual‐frequency Global Positioning System (GPS) signals from 30 globally distributed network sites are fit to a simple ionospheric shell model, yielding a map of the ionosphere in the northern hemisphere every 12 hours during the January 1–15, 1993 period, as well as values for the satellite and receiver instrumental biases. Root‐mean‐square (RMS) residuals of 2–3 TEC units are observed over the 20°–80° latitude band. Various systematic errors affecting the TEC estimates are discussed. The capability of using these global maps to produce ionospheric calibrations for sites at which no GPS data are available is also investigated.

show abstract

Section: Figure L This Map Shows the Gps Receiver Locations For The mentioning

confidence: 99%

Subdaily northern hemisphere ionospheric maps using an extensive network of GPS receivers

Wilson¹,

Mannucci²,

Edwards³

1995

Radio Science

122

View full text Add to dashboard Cite

show abstract

“…GPS receivers are particularly suitable for this purpose [MacDoran, 1979]. A comparison of the JPL GPS satellite emission range inferred Earth survey (SERIES) data with Faraday rotation measurements was reported by Royden et al [1984]. Later studies of the JPL Copyright 1988 by the American Geophysical Union.…”

Section: Introductionmentioning

confidence: 99%

A comparison of mapped and measured total ionospheric electron content using global positioning system and beacon satellite observations

Lanyi¹,

Roth²

1988

Radio Science

291

192

View full text Add to dashboard Cite

Total ionospheric electron contents (TEC) were measured by global positioning system (GPS) dual‐frequency receivers developed by the Jet Propulsion Laboratory (JPL). The measurements included P‐code (precise ranging code) and carrier phase data for six GPS satellites during multiple 5‐hour observing sessions. A set of these GPS TEC measurements were mapped from the GPS lines of sight to the line of sight of a Faraday beacon satellite by statistically fitting the TEC data to a simple model of the ionosphere. The mapped GPS TEC values were compared with the Faraday rotation measurements. Because GPS transmitter offsets are different for each satellite and because some GPS receiver offsets were uncalibrated, the sums of the satellite and receiver offsets were estimated simultaneously with the TEC in a least squares procedure. The accuracy of this estimation procedure is evaluated, indicating that the error of the GPS‐determined line of sight TEC can be at or below 1×1016 el/m2. Consequently, the current level of accuracy is comparable to the Faraday rotation technique; however, GPS provides superior sky coverage.

show abstract

“…Over the past three decades methods to measure the total electron content (TEC) using global positioning system (GPS) dual-frequency receivers have been developed and improved (e.g., Royden et al 1984;Lanyi & Roth 1988;Mannucci et al 1998; Schaer & helvétique des sciences naturelles. Commission géodésique 1999; Iijima et al 1999;Komjathy et al 2005;Erdogan et al 2016).…”

Section: Calculation Of the Ionospheric Rm From Archival Tecmentioning

confidence: 99%

Ionospheric Attenuation of Polarized Foregrounds in 21 cm Epoch of Reionization Measurements: A Demonstration for the HERA Experiment

Martinot

Aguirre

Kohn

et al. 2018

ApJ

View full text Add to dashboard Cite

Foregrounds with polarization states that are not smooth functions of frequency present a challenge to Hi Epoch of Reionization (EoR) power spectrum measurements if they are not cleanly separated from the desired Stokes I signal. The intrinsic polarization impurity of an antenna's electromagnetic response limits the degree to which components of the polarization state on the sky can be separated from one another, leading to the possibility that this frequency structure could be confused for Hi emission. We investigate the potential of Faraday rotation by the Earth's ionosphere to provide a mechanism for both mitigation of, and systematic tests for, this contamination. Specifically, we consider the delay power spectrum estimator, which relies on the expectation that foregrounds will be separated from the cosmological signal by a clearly demarcated boundary in Fourier space, and is being used by the Hydrogen Epoch of Reionization Array (HERA) experiment. Through simulations of visibility measurements which include the ionospheric Faraday rotation calculated from real historical ionospheric plasma density data, we find that the incoherent averaging of the polarization state over repeated observations of the sky may attenuate polarization leakage in the power spectrum by a factor of 10 or more. Additionally, this effect provides a way to test for the presence of polarized foreground contamination in the EoR power spectrum estimate.

show abstract

Comparison of NAVSTAR satellite L band ionospheric calibrations with Faraday rotation measurements

Cited by 13 publications

References 5 publications

Subdaily northern hemisphere ionospheric maps using an extensive network of GPS receivers

Subdaily northern hemisphere ionospheric maps using an extensive network of GPS receivers

A comparison of mapped and measured total ionospheric electron content using global positioning system and beacon satellite observations

Ionospheric Attenuation of Polarized Foregrounds in 21 cm Epoch of Reionization Measurements: A Demonstration for the HERA Experiment

Contact Info

Product

Resources

About