Use of Distance-measuring Equipment (DME) for Correcting Errors in Position, Velocity, and Wind Measurements from Aircraft Inertial Navigation Systems

Rodi, Alfred R.; Fankhauser, J. C.; Vaughan, Robin L.

doi:10.1175/1520-0426(1991)008<0827:uodmef>2.0.co;2

Cited by 4 publications

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“…The University of Wyoming (UW) and NCAR King Air aircraft (e.g., Fankhauser et al 1985;Rodi et al 1991) made numerous flights at various levels during roll occurrences. The flights across the rolls within the CBL are used extensively in this study.…”

Section: Methodsmentioning

confidence: 99%

The Effect of Small-Scale Moisture Variability on Thunderstorm Initiation

Weckwerth¹

2000

Mon. Wea. Rev.

156

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Observations during the Convection and Precipitation/Electrification (CaPE) project illustrate that horizontal convective rolls are capable of providing sufficient forcing to initiate free moist convection. Rolls occurred on the majority of days during CaPE but on only some of those days were they able to trigger thunderstorms. This study was undertaken to ascertain the difference between the two types of roll days: the storm days and the nostorm days. All obvious sounding parameters were examined: stability parameters, midlevel moisture, and vertical wind shear. None of them showed a difference between the storm and no-storm days. This is not surprising in light of recent work showing that soundings within rolls are not representative of the environmental stability unless they happen to be launched into roll updraft branches. This is due to the upward transport of warm, moist air in the roll updraft regions atop which cloud streets and sometimes thunderstorms form. Numerous other parameters examined were also fruitless in identifying any difference between the days. These included surface station measurements, cell motion relative to roll updraft locations, surface topography, and roll circulation strength and depth. The only useful predictor was obtained by modifying the soundings using aircraft data as they were flying across the rolls and sampling moisture contained within the roll updraft branches. Using these roll updraft moisture measurements to recalculate sounding stability parameters provided an effective means of predicting thunderstorm formation.

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Section: Methodsmentioning

confidence: 99%

The Effect of Small-Scale Moisture Variability on Thunderstorm Initiation

Weckwerth¹

2000

Mon. Wea. Rev.

156

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“…Previous work has shown that high-resolution radar altimeters enable height measurements above ground level with an accuracy of 0.5 m (see Brown et al 1981;Kennedy 1981, 1982;Parish et al1988;Rodi and Parish 1988;Parish 2000). Conceptually, the means by which the PGF is determined is quite simple.…”

Section: Introductionmentioning

confidence: 99%

“…1. A summary of potential instrumentation errors is found in Rodi and Parish (1988). A summary of potential instrumentation errors is found in Rodi and Parish (1988).…”

Section: Introductionmentioning

confidence: 99%

“…Several difficulties must be overcome to ensure accurate detection of the isobaric slopes. Foremost among instrumentation considerations was the navigation problem that has been addressed using various techniques before the general use of global positioning system (GPS) (e.g., Rodi et al 1991). Foremost among instrumentation considerations was the navigation problem that has been addressed using various techniques before the general use of global positioning system (GPS) (e.g., Rodi et al 1991).…”

Section: Introductionmentioning

confidence: 99%

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Determination of the Horizontal Pressure Gradient Force Using Global Positioning System on board an Instrumented Aircraft

Parish

Burkhart

Rodi

2007

Journal of Atmospheric and Oceanic Technology

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The horizontal pressure gradient force is the single most important dynamical term in the equation of motion that governs the forcing of the atmosphere. It is well known that the slope of an isobaric surface is a measure of the horizontal pressure gradient force. Measurement of this force over mesoscale distances using an airborne platform has been attempted for over two decades in order to understand the dynamics of various wind systems. The most common technique has been to use a radar altimeter to measure the absolute height of an isobaric surface above sea level. Typical values of the horizontal pressure gradient force in the atmosphere are quite small, amounting to an isobaric surface slope of 0.0001 for a 10 m s Ϫ1 geostrophic wind at middle latitudes. Detecting the horizontal pressure gradient over irregular terrain using an instrumented aircraft has proven to be especially difficult since correction for the underlying terrain features must be made. Use of the global positioning system (GPS) is proposed here as a means to infer the horizontal pressure gradient force without the need for altimetry and terrain registration over irregular surface topography. Differential kinematic processing of data from dual-frequency, carrier phase tracking receivers on research aircraft with similar static base station receivers enables the heights of an isobaric surface to be determined with an accuracy estimated to be a few decimeters. Comparison of results obtained by conventional altimetry-based methods over the ocean and Lake Michigan with GPS reveals the potential of the GPS method at determining the horizontal pressure gradient force, even over complex terrain.

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Improving Research Aircraft Navigation by Incorporating INS and GPS Information in a Variational Solution

Matejka

Lewis

1997

J. Atmos. Oceanic Technol.

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Use of Distance-measuring Equipment (DME) for Correcting Errors in Position, Velocity, and Wind Measurements from Aircraft Inertial Navigation Systems

Cited by 4 publications

References 0 publications

The Effect of Small-Scale Moisture Variability on Thunderstorm Initiation

The Effect of Small-Scale Moisture Variability on Thunderstorm Initiation

Determination of the Horizontal Pressure Gradient Force Using Global Positioning System on board an Instrumented Aircraft

Improving Research Aircraft Navigation by Incorporating INS and GPS Information in a Variational Solution

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