Tracker: A three-dimensional raytracing program for ionospheric radio propagation

Argo, P.E.; DeLapp, D.; Sutherland, C.D.; Farrer, R.G.

doi:10.2172/10196580

Cited by 2 publications

(11 citation statements)

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“…ICED was originally developed by the Air Force Air Weather Service (AWS) for near real-time ionospheric specifications of the mid-latitudes and auroral zone of the northern hemisphere (Daniell, et al, 1992;Goodman, 1992). The version incorporated into the ray tracing contains distinct algorithms for the different geographical regions of the Earth (Argo, et al, 1994). The geomagnetic field used with ICED is a simplified dipole model, ignoring the irregularities of the true field.…”

Section: Ionospheric Climatological Modelsmentioning

confidence: 99%

“…The horizontal variations appear to be well-represented by such an approximation (Daniell, et al, 1992). The algorithms describing the various ionospheric regions are described in detail in Argo, et al (1994), Kelley (1989), and Tascione, et al (1988).…”

Section: Ionospheric Climatological Modelsmentioning

confidence: 99%

“…Ray theory breaks down at caustics. Without higher order corrections, ray theory can only account for refraction from large-scale gradients in the background propagation medium (Argo, et al, 1994). The basis for most of the ionospheric raytracing methods currently in use is Hamilton's equations derived from a variational analysis applied to Fermat's principle (Roussel-Dupre and Haselgrove, 1963;Haselgrove, 1954).…”

Section: Ionospheric Raytracingmentioning

confidence: 99%

“…The Hamiltonian raytracing method involves numerically integrating the Hamiltonian equations for the ray position and wave vector, given the initial conditions for the ray (Argo, et al, 1994). Fermat's principle of least time is the starting point for the Haselgrove formulation of the Hamiltonian raytracing method (Kelso, 1964).…”

Section: Ionospheric Raytracingmentioning

confidence: 99%

“…Information from the rays that penetrate the ionosphere are collected and analyzed to produce a frequency and transmitter-receiver geometry dependent description of the ionospheric effects on the radio propagation. TRACKER (Argo, et al, 1994) is used here to produce the raytracing-derived ITF for realistic model ionospheres under various conditions.…”

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confidence: 99%

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A predictive model of the HF noise environment at satellite heights

McCoy

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This manuscript has been reproduced from the microfilm master. UMI films the text directly from the original or copy submitted. Thus, some thesis and dissertation copies are in typewriter face, while others may be from any type of computer printer. The quality of this reproduction is dependent upon the quali^ of the copy submitted. Broken or indistinct print, colored or poor quality illustrations and photographs, print bleedthrough, substandard margins, and inq>roper alignment can adversely aSect reproduction.

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Section: Ionospheric Climatological Modelsmentioning

confidence: 99%

Section: Ionospheric Climatological Modelsmentioning

confidence: 99%

Section: Ionospheric Raytracingmentioning

confidence: 99%

Section: Ionospheric Raytracingmentioning

confidence: 99%

mentioning

confidence: 99%

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A predictive model of the HF noise environment at satellite heights

McCoy

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Evaluating the impact of commercial radio occultation data using the observation system simulation experiment tool for ionospheric electron density specification

Hughes,

Collett,

Crowley

et al. 2024

Front. Astron. Space Sci.

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Decision makers must often choose how many sensors to deploy, of what types, and in what locations to meet a given operational or scientific outcome. An observation system simulation experiment (OSSE) is a numerical experiment that can provide critical decision support to these complex and expensive choices. An OSSE uses a “truth model” or “nature run” to simulate what an observation system would measure and then passes these measurements to an assimilation model. Then, the output of the assimilation model is compared to that of the truth model to assess improvement and the impact of the observation system. Orion Space Solutions has developed the OSSE tool (OSSET) to perform OSSEs for ionospheric electron density specification quickly and accurately. In this study, we use OSSET to predict the impact of adding commercial radio occultation total electron content (TEC) data to an assimilation model. We compare the OSSE’s predictions to the real performance at a group of validation ionosondes and find good agreement. We also demonstrate the global assessments that are possible with the OSSET using the improvement in critical frequency specification as an example. From this, we find that commercial radio occultation data can improve the critical frequency specification by nearly 20% at high latitudes, which are not covered by COSMIC-2. The commercial satellites are in sun-synchronous orbits with constant local times, and this improvement is concentrated at these local times.

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Tracker: A three-dimensional raytracing program for ionospheric radio propagation

Cited by 2 publications

References 0 publications

A predictive model of the HF noise environment at satellite heights

A predictive model of the HF noise environment at satellite heights

Evaluating the impact of commercial radio occultation data using the observation system simulation experiment tool for ionospheric electron density specification

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