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Proceedings Paper

C/NOFS: a demonstration system to forecast equatorial ionospheric scintillation that adversely affects navigation, communication, and surveillance systems
Author(s): Frederick J. Rich; Odile de La Beaujardiere; John M. Retterer; Bamandas Basu; Keith Groves; Laila S. Jeong; Theodore Beach; Donald Hunton; Jason Mellein; Kimberlee Kachner
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Paper Abstract

The purpose of the Communication/Navigation Outage Forecasting System (C/NOFS) is to detect and forecast ionospheric irregularities that adversely impact communication, navigation and surveillance systems. The C/NOFS consists of ground sites that monitor the radio link to geosynchronous and GPS spacecraft, a fully-instrumented monitoring satellite scheduled for launch in 2005 and a central data collection facility that creates scintillation warnings in near real-time. The C/NOFS spacecraft will be launched into a low inclination (13°), elliptical (~ 375 x 710 km) orbit. Sensors on the C/NOFS spacecraft measure the ambient ionosphere near the equator and detect density fluctuations which cause scintillation. Ionospheric irregularities often occur after sunset within ±20° of the magnetic equator. These irregularities can be fairly benign, causing a small amount of radio scintillation and perturbing only UHF/VHF communications, or they can be very severe, causing L-band scintillation that interfere with the functioning of GPS receivers. In these severe cases, the ionospheric irregularities can extend beyond 1000 km altitude. One of the challenges of this project is to go beyond detecting irregularities and to predict scintillation-producing irregularities up to 8 hours into the future and estimating changes in the climatology 24 hours or more into the future.

Paper Details

Date Published: 14 October 2004
PDF: 12 pages
Proc. SPIE 5548, Atmospheric and Environmental Remote Sensing Data Processing and Utilization: an End-to-End System Perspective, (14 October 2004); doi: 10.1117/12.566115
Show Author Affiliations
Frederick J. Rich, Air Force Research Lab. (United States)
Odile de La Beaujardiere, Air Force Research Lab. (United States)
John M. Retterer, Air Force Research Lab. (United States)
Bamandas Basu, Air Force Research Lab. (United States)
Keith Groves, Air Force Research Lab. (United States)
Laila S. Jeong, Air Force Research Lab. (United States)
Theodore Beach, Air Force Research Lab. (United States)
Donald Hunton, Air Force Research Lab. (United States)
Jason Mellein, Air Force Research Lab. (United States)
Kimberlee Kachner, Air Force Research Lab. (United States)


Published in SPIE Proceedings Vol. 5548:
Atmospheric and Environmental Remote Sensing Data Processing and Utilization: an End-to-End System Perspective
Hung-Lung Allen Huang; Hal J. Bloom, Editor(s)

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