Plasmaspheric and Enhanced Ionospheric Total Electron Content Monitoring

Award Information
Agency:
Department of Defense
Branch
Air Force
Amount:
$99,920.00
Award Year:
2004
Program:
SBIR
Phase:
Phase I
Contract:
FA8718-04-C-0009
Award Id:
67462
Agency Tracking Number:
F041-040-1111
Solicitation Year:
n/a
Solicitation Topic Code:
n/a
Solicitation Number:
n/a
Small Business Information
P.O. Box 3027, Bellevue, WA, 98009
Hubzone Owned:
N
Minority Owned:
N
Woman Owned:
N
Duns:
151471349
Principal Investigator:
Susan Rao
Research Scientist
(603) 889-3661
susan@nwra.com
Business Contact:
Joan Oltman-Shay
President/Sr. Research Scientiest
(425) 644-9660
contracts-grants@nwra.com
Research Institution:
n/a
Abstract
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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