Engineering topics
Iijima, B.
Publications and source records attributed to Iijima, B..
Daily JPL processing of 1000+ ground-based GPS receivers to estimate interfrequency biases and other practical applications
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Interplanetary ionospheric coupling: the 6 November 2001 magnetic storm event
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Detection of the conditions for polar stratospheric cloud formation during the Arctic winter using GPS radio occultations
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Analysis of CHAMP ionospheric measurements using a global ionospheric data assimilation model
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An overview of CHAMP radio occultation analysis at JPL
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Precise orbit determination for CHAMP using GPS data from BlackJack Receiver
In this paper we present results for CHAMP POD using the precise GPS measurements collected by the BlackJack receiver through the up-looking antenna. We will describe the quality of the tracking data, the tuning of the reduced-dynamic model for the 400-km orbit, and the various methods of evaluating the orbit accuracy.
Precise CHAMP orbit determination with GPS tracking
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Robust detection of ionospheric irregularities
The approach outlined in this paper conservatively bounds the ionospheric errors even for the worst observed ionospheric conditions to date, using data sets taken from the operational receivers in the WAAS reference station network.
Reducing Systematic Bias Variation in Global Ionosphere Maps to Support Satellite Altimeter Calibration
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Ionospheric specification algorithms for precise GPS-based aircraft navigation
We present a technique for converting real-time total electron content (TEC) measurements into gridded vertical delay corrections at the GPS L***sub***1 frequency, which will be broadcast to users every 5 min via geosynchronous satellite. Users will convert these delays to slant corrections for their own particular lines of sight to GPS satellites. To preserve user safety, estimates of the error in the user delay corrections will also be broadcast.
A New Model for Retrieving Slant TEC Corrections for Wide Area Differential GPS
To provide delay corrections to single frequency users, wide area differential GPS systems depend upon accurate determination of ionospheric total electron content (TEC).
Ionosphere Delay Calibration and Calibration Errors for Satellite Navigation of Aircraft
The Federal Aviation Administration (FAA) is implementing a satellite-based navigation system for aircraft using the Global Positioning System (GPS).
Assessment of Global TEC Mapping Using a Three-Dimensional Electron Density Model
Dual-frequency transmissions from the Global Positioning System satellites can be used to measure and map ionospheric total electron content (TEC) on global scales. Using data exclusively from ground-based GPS networks, global ionosphere mapping has been successfully applied using either two or three dimensional techniques.
Automated Daily Process for Global Ionospheric Total Electron Content Maps and Satellite Ocean Altimeter Ionospheric Calibration Based on Global Positioning System Data
The accuracy of single-frequency ocean altimeters benefits from calibration of the total electron content (TEC) of the ionosphere below the satellite.
Determining The Uncertainty of Ionospheric Corrections For Users In Wide Area Augmentation Systems
Broadcast messages of the FAA's Wide Area Augmentation System (WAAS) include the grid ionosphere vertical error (GIVE).
GPS and Ionosphere
The Global Positioning System (GPS) constellation of satellites is revolutionizing the science and technology of the Earth's ionosphere.