Plasmaspheric and Enhanced Ionospheric Total Electron Content Monitoring

Award Information
Agency: Department of Defense
Branch: Air Force
Contract: FA8718-04-C-0009
Agency Tracking Number: F041-040-1111
Amount: $99,920.00
Phase: Phase I
Program: SBIR
Awards Year: 2004
Solicitation Year: 2004
Solicitation Topic Code: AF04-040
Solicitation Number: 2004.1
Small Business Information
P.O. Box 3027, Bellevue, WA, 98009
DUNS: 151471349
HUBZone Owned: N
Woman Owned: N
Socially and Economically Disadvantaged: N
Principal Investigator
 Susan Rao
 Research Scientist
 (603) 889-3661
Business Contact
 Joan Oltman-Shay
Title: President/Sr. Research Scientiest
Phone: (425) 644-9660
Research Institution
The integrated charge density through the ionosphere and plasmasphere along a line-of-sight, denoted Total Electron Content (TEC), is a quantity that influences the operation of various radio-frequency systems. Measurement of TEC is utilized in order to assess environmental or system impacts, with possibilities for correction or mitigation. The current primary source of TEC measurements is dual-frequency Global Positioning System (GPS) receiver systems. These measurements contain contributions from the ionosphere and the plasmasphere, as well as biases arising from instrumental sources. While plasmasphere charge densities are considerably less than those of the ionosphere, the large extent of the plasmasphere can produce a significant integrated contribution relative to that of the ionosphere. The instrumental biases can be of any magnitude. To achieve highly accurate TEC measurements, of the order of one TEC unit (1016 electrons/m2 for the integrated charge density), a highly accurate calibration technique, to eliminate the bias effects from the GPS TEC measurements, is required. Developments of a mathematical technique, based on observed characteristics of the ionosphere, have presented the opportunity for conducting separate measurements of the ionosphere and plasmasphere contributions to TEC. This proposal presents efforts to be undertaken for further developments and validation of this technique.

* Information listed above is at the time of submission. *

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