Navigation—An overview

Dodington, Sven H.

doi:10.1109/proc.1983.12741

Cited by 7 publications

(1 citation statement)

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“…In this section, we briefly discuss such possible effects. The importance of global navigation systems was emphasized by a recent special issue of the Proceedings of the IEEE on this topic [Dodington, 1983]. Prominent among the systems that are currently in use are the Omega and LORAN-C systems, which are based on long-range hyperbolic navigation involving, respectively, the measurement of phase and time differences among signals from selected VLF/LF transmitters located around the globe [Swanson, 1983;Frank, 1983].…”

Section: Possible Effects On Global V L F / L F Navigationmentioning

confidence: 99%

Subionospheric VLF/LF phase perturbations produced by lightning‐whistler induced particle precipitation

Inan

Carpenter²,

Helliwell³

et al. 1985

J. Geophys. Res.

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New evidence of phase perturbations of subionospheric VLF/LF signals, produced by lightning‐whistler‐induced precipitation of bursts of radiation belt electrons, is reported. Phase changes of 0.1–1.0 µs on a 12.9‐kHz signal arriving at Palmer, Antarctica (L ∼ 2.4), over a ∼2400‐km path are regularly observed with a characteristic signature of a rapid (≤ 1 s) onset followed by a relatively slow (10–30 s) recovery. Event occurrence peaks during equinoctial periods, with typical rates of 1–40 events per hour lasting for several hours per night. The observed phase perturbations can be interpreted to correspond to a rapid reduction of up to ∼0.1–1.0 km in the effective nighttime ionospheric reflection height (∼85 km) for the subionospheric VLF signals. The incident energetic particle fluxes that are required to produce the extra ionization are estimated to be ∼10−3‐10−2 ergs cm−2 s−1. Such flux levels are generally consistent with those estimated using theoretical models of whistler‐particle resonant scattering as well as direct satellite‐based observations of whistler‐induced precipitation. This phenomenon provides a sensitive means for detecting wave‐induced burst particle precipitation. The ionospheric perturbations resulting from such precipitation may cause significant errors in certain global navigation aids, such as the Differential Omega and LORAN‐C systems.

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Section: Possible Effects On Global V L F / L F Navigationmentioning

confidence: 99%

Subionospheric VLF/LF phase perturbations produced by lightning‐whistler induced particle precipitation

Inan

Carpenter²,

Helliwell³

et al. 1985

J. Geophys. Res.

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Granas, a New Satellite-based Navigation System

Euler

Hoefgen

1984

J. Navigation

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Granas (Global RAdio NAvigation System) is a satellite-based radio navigation system with global coverage, high accuracy and continuous availability for civil users on land, sea and air. Its performance, thus, is superior to existing ground-based radio navigation systems as Omega, Loran, Decca, and so on.The principle of Granas user-position determination is similar to that of Navstar GPS or Navsat in that a user makes pseudo-range measurements to a number of satellites visible above a 5° elevation angle. These ranging operations are performed using time-of-arrival (TOA) measurements of navigation signals transmitted by satellites. Knowing the discrete positions of four or more satellites and their pseudo-ranges, a user may compute its own clock bias and its position in three dimensions (longitude, latitude and altitude).

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Airborne electronic equipment immunity to the very low frequency electromagnetic field influence (civil aviation standards problems)

Sorokin

IEEE 6th International Symposium on Electromagnetic Compatibility and Electromagnetic Ecology, 2005.

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Navigation—An overview

Cited by 7 publications

References 0 publications

Subionospheric VLF/LF phase perturbations produced by lightning‐whistler induced particle precipitation

Subionospheric VLF/LF phase perturbations produced by lightning‐whistler induced particle precipitation

Granas, a New Satellite-based Navigation System

Airborne electronic equipment immunity to the very low frequency electromagnetic field influence (civil aviation standards problems)

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