An ionospheric obliquity process responsive to line‐of‐sight azimuth and elevation

Conker, Robert S.; El-Arini, M. Bakry

doi:10.1029/2002rs002615

Cited by 8 publications

(7 citation statements)

References 3 publications

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“…In converting slant TEC to vertical TEC, this study applies the simple “plane‐parallel” model to the FORTE‐derived slant TEC. Because of the Earth's curvature, such a simplification can have effects on the derived vertical TECs for low elevation angles under large electron density spatial gradients [ Conker and El‐Arini , 2002]. In this section we quantitatively describe the biases from using such a simple conversion model and discuss the degree of related uncertainties in interpreting our results.…”

Section: Forte‐derived Tec Analysismentioning

confidence: 99%

Total electron content (TEC) variability at Los Alamos, New Mexico: A comparative study: FORTE‐derived TEC analysis

Huang

Roussel-Dupré

2005

Radio Science

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Data collected from Fast On‐Orbit Recording of Transient Events (FORTE) satellite–received Los Alamos Portable Pulser (LAPP) signals during 1997–2002 are used to derive the total electron content (TEC) at Los Alamos, New Mexico. The LAPP‐derived TECs at Los Alamos are analyzed for diurnal, seasonal, interannual, and 27‐day solar cycle variations. Several aspects in deriving TEC are analyzed, including slant to vertical TEC conversion, quartic effects on transionosperic signals, and geomagnetic storm effects on the TEC variance superimposed on the averaged TEC values.

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Section: Forte‐derived Tec Analysismentioning

confidence: 99%

Total electron content (TEC) variability at Los Alamos, New Mexico: A comparative study: FORTE‐derived TEC analysis

Huang

Roussel-Dupré

2005

Radio Science

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“…[28] It should be noted that a very useful closed form expression is provided by Conker and El-Arini [2002] relating the variance of the tracking error at the output of a phase lock loop (PLL) to the input phase scintillation signal PSD, the amplitude scintillation signal strength S 4 , and to the PLL parameters.…”

Section: Emagr and Gsv4004 Resultsmentioning

confidence: 99%

GPS receiver performance characterization under realistic ionospheric phase scintillation environments

Morrissey

Shallberg

Dierendonck³

et al. 2004

Radio Science

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It is well known that ionospheric scintillation has the potential to affect all types of GPS receivers, even dual‐frequency military precise‐positioning service versions. In a previous effort the degree of degradation to Wide Area Augmentation System (WAAS) operation caused by scintillation, on the basis of simulated data input to an actual WAAS reference receiver under carefully controlled laboratory conditions at Space and Naval Warfare Systems Center, was analyzed and reported [Morrissey et al., 2000]. This degradation is manifested in increased errors for carrier phase and code range measurements and in a higher probability of loss of GPS signal track. However, the results supported the assessment that scintillation should not be a problem for WAAS receivers in the conterminous United States, except perhaps during the very rare occurrence of a “severe geomagnetic storm.” The previous work was briefed in a number of fora, and a detailed report was widely distributed throughout the ionospheric community along with a request for identification of any “gaps” in the results that could be addressed with further testing. From the feedback received, the following tests were conducted: (1) tests with long‐duration deep amplitude nulls, corresponding to the GPS signal moving with the ionospheric disturbance; (2) tests with phase scintillation waveforms derived from 50 Hz ionospheric scintillation monitor (ISM) data previously collected by the U.S. Air Force (Philips Laboratory) at Antofagosta, Chile; (3) tests of a modified military single‐frequency receiver (Enhanced Miniaturized Airborne GPS Receiver (EMAGR)) side‐by‐side with the WAAS receiver, with emphasis on maintaining lock at L1; and (4) tests at values of input carrier‐to‐noise ratio (CNR) lower (i.e., down to 36 dB Hz) than those used in the original tests. The tests with deep amplitude nulls were reported by Morrissey et al. [2002], and the tests with realistic input phase scintillation waveforms were reported at the Ionospheric Effects Symposium (IES) 2002. The current paper is based upon the IES 2002 results as modified by recent testing. Both these amplitude and phase results include EMAGR and low CNR performance.

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“…(4) MF based on empirical models, such as the IRI model, the Chapman profile, and three-dimensional (3D) models. These models are applied to calculate the average height of electron density or the integral height along the trace [24,25]. For example, the Chapman function is written as Equation 8.…”

Section: Overview Of Existing Mfsmentioning

confidence: 99%

An Enhanced Mapping Function with Ionospheric Varying Height

Xiang

Gao

2019

Remote Sensing

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Mapping function (MF) converts the line-of-sight slant total electron content (STEC) into the vertical total electron content (VTEC), and vice versa. In an MF, an essential parameter is the ionospheric effective height. However, the inhomogeneous ionosphere makes this height vary spatially and temporally, meaning it is not a global constant. In the paper, we review several mapping functions and propose a mapping function that utilizes the ionospheric varying height (IVH). We investigate impacts of the IVH on mapping errors and on the ionospheric modeling, as well as on the satellite and receiver differential code biases (DCBs). Our analysis results indicate that the mapping errors using IVH are smaller than those from the fixed height of 450 km. The integral height achieves smaller mapping errors than using a fixed height of 450 km, an improvement of about 8% when compared with the fixed height of 450 km. And 35% smaller mapping errors were found using HmF2 at the lower latitude. Also, the effects of IVH on the satellite DCBs are about 0.1 ns, and larger impacts on the receiver DCBs at 1.0 ns.

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An ionospheric obliquity process responsive to line‐of‐sight azimuth and elevation

Cited by 8 publications

References 3 publications

Total electron content (TEC) variability at Los Alamos, New Mexico: A comparative study: FORTE‐derived TEC analysis

Total electron content (TEC) variability at Los Alamos, New Mexico: A comparative study: FORTE‐derived TEC analysis

GPS receiver performance characterization under realistic ionospheric phase scintillation environments

An Enhanced Mapping Function with Ionospheric Varying Height

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