Operational Single-Frequency GPS Error Maps

Details Operational Single-Frequency GPS Error Maps Operational Single-Frequency GPS Error Maps

Dec 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001agufmsa51a0763b&link_type=abstract

American Geophysical Union, Fall Meeting 2001, abstract #SA51A-0763

Physics

2447 Modeling And Forecasting, 2494 Instruments And Techniques, 6994 Instruments And Techniques

Scientific paper

The Air Force Research Laboratory and Detachment 11, Space & Missile Systems Center have implemented a new system of graphical products that provide easy-to-visualize displays of space weather effects on theater-based radio systems operating through the ionosphere. This system, the Operational Space Environment Network Display (OpSEND), is now producing its first four products at 55th Space Weather Squadron (55SWXS) in Colorado Springs. One of these products, the OpSEND Estimated GPS Single-Frequency Error Map, provides a current specification (nowcast) and one-hour forecast of estimated positioning errors that result from inaccurate ionospheric correction and GPS constellation geometry. Two-frequency GPS receivers can measure ionospheric range errors due to ionospheric total electron content (TEC), but single-frequency receivers depend on a built-in Ionospheric Correction Algorithm (ICA) for ionospheric error mitigation. The ICA, developed at AFRL in the 1970's corrects for roughly half of the ionospheric error. In the OpSEND GPS Single-Frequency Error Map, position error due to the ionosphere is based on the differences between ionospheric estimates from ICA and those generated by more accurate global ionospheric specification from the PRISM model, updated by real-time TEC data from a global set of monitor stations. Details and examples of the OpSEND system and the GPS Error Map will be presented, as well as results of initial GPS Error Map validation studies, comparing GPS error predictions and PRISM TEC specifications with observational data.

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