Distributed sensing of ionospheric irregularities with a GNSS receiver array

We present analysis methods for studying the structuring and motion of ionospheric irregularities at the subkilometer scale sizes that produce L band scintillations. Spaced‐receiver methods are used for Global Navigation Satellite System (GNSS) receivers' phase measurements over approximately s...

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Veröffentlicht in:Radio science 2017-08, Vol.52 (8), p.988-1003
Hauptverfasser: Su, Yang, Datta‐Barua, Seebany, Bust, Gary S., Deshpande, Kshitija B.
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container_end_page 1003
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container_title Radio science
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creator Su, Yang
Datta‐Barua, Seebany
Bust, Gary S.
Deshpande, Kshitija B.
description We present analysis methods for studying the structuring and motion of ionospheric irregularities at the subkilometer scale sizes that produce L band scintillations. Spaced‐receiver methods are used for Global Navigation Satellite System (GNSS) receivers' phase measurements over approximately subkilometer to kilometer length baselines for the first time. The quantities estimated by these techniques are plasma drift velocity, diffraction anisotropy magnitude and orientation, and characteristic velocity. Uncertainties are quantified by ensemble simulation of noise on the phase signals carried through to the observations of the spaced‐receiver linear system. These covariances are then propagated through to uncertainties on drifts through linearization about the estimated values of the state. Five receivers of SAGA, the Scintillation Auroral Global Positioning System (GPS) Array, provide 100 Hz power and phase data for each channel at L1 frequency. The array is sited in the auroral zone at Poker Flat Research Range, Alaska. A case study of a single scintillating satellite observed by the array is used to demonstrate the spaced‐receiver and uncertainty estimation process. A second case study estimates drifts as measured by multiple scintillating channels. These scintillations are correlated with auroral activity, based on all‐sky camera images. Measurements and uncertainty estimates made over a 30 min period are compared to a collocated incoherent scatter radar and show good agreement in horizontal drift speed and direction during periods of scintillation for which the characteristic velocity is less than the drift velocity. Key Points A kilometer‐spaced auroral GNSS receiver array senses ionospheric irregularity layer drift and diffraction anisotropy Intervals of single‐ and multiple‐satellite scintillation are analyzed with Monte Carlo simulation for uncertainty estimation Estimates of horizontal drifts compare favorably with incoherent scatter radar measurements
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Spaced‐receiver methods are used for Global Navigation Satellite System (GNSS) receivers' phase measurements over approximately subkilometer to kilometer length baselines for the first time. The quantities estimated by these techniques are plasma drift velocity, diffraction anisotropy magnitude and orientation, and characteristic velocity. Uncertainties are quantified by ensemble simulation of noise on the phase signals carried through to the observations of the spaced‐receiver linear system. These covariances are then propagated through to uncertainties on drifts through linearization about the estimated values of the state. Five receivers of SAGA, the Scintillation Auroral Global Positioning System (GPS) Array, provide 100 Hz power and phase data for each channel at L1 frequency. The array is sited in the auroral zone at Poker Flat Research Range, Alaska. A case study of a single scintillating satellite observed by the array is used to demonstrate the spaced‐receiver and uncertainty estimation process. A second case study estimates drifts as measured by multiple scintillating channels. These scintillations are correlated with auroral activity, based on all‐sky camera images. Measurements and uncertainty estimates made over a 30 min period are compared to a collocated incoherent scatter radar and show good agreement in horizontal drift speed and direction during periods of scintillation for which the characteristic velocity is less than the drift velocity. 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A case study of a single scintillating satellite observed by the array is used to demonstrate the spaced‐receiver and uncertainty estimation process. A second case study estimates drifts as measured by multiple scintillating channels. These scintillations are correlated with auroral activity, based on all‐sky camera images. Measurements and uncertainty estimates made over a 30 min period are compared to a collocated incoherent scatter radar and show good agreement in horizontal drift speed and direction during periods of scintillation for which the characteristic velocity is less than the drift velocity. 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source Wiley Online Library Journals Frontfile Complete; Wiley Online Library AGU Free Content; EZB-FREE-00999 freely available EZB journals; Wiley Online Library (Open Access Collection)
subjects Anisotropy
array
carrier phase
Case studies
Computer simulation
Diffraction
Estimates
Global navigation satellite system
Global Navigation Satellite Systems
Global Positioning System
Global positioning systems
GPS
Incoherent scatter radar
Ionosphere
Irregularities
Monte Carlo simulation
Navigation
Navigation satellites
Plasma drift
Radar
Receivers
Satellite navigation systems
Satellite observation
Scattering
Scintillation
Uncertainty
Velocity
title Distributed sensing of ionospheric irregularities with a GNSS receiver array
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