Radar Ionospheric Impact Mitigation

Award Information
Agency:
Department of Defense
Branch
Air Force
Amount:
$99,996.00
Award Year:
2006
Program:
SBIR
Phase:
Phase I
Contract:
FA8718-06-C-0034
Award Id:
78885
Agency Tracking Number:
F061-250-1216
Solicitation Year:
n/a
Solicitation Topic Code:
n/a
Solicitation Number:
n/a
Small Business Information
14508 NE 20th St., Bellevue, WA, 98007
Hubzone Owned:
N
Minority Owned:
N
Woman Owned:
N
Duns:
151471349
Principal Investigator:
James Secan
Senior Research Scientist
(520) 319-7773
jim@nwra.com
Business Contact:
Joan Oltman-Shay
President
(425) 644-9660
contracts-grants@nwra.com
Research Institution:
n/a
Abstract
Accurate real-time determination of the three-dimensional electron density distribution of the ionosphere is required to mitigate ionospheric delay and refraction effects on Air Force ground-based space-surveillance radars. We have developed a prototype system that processes phase and group delay time series from dual frequency GPS receivers and produces a dynamic ionospheric model over a fixed geographical area with dimensions of the order of several thousand kilometers that is consistent with all the input data. The core of the inversion technique is Tikhonov's methodology for solving ill-posed problems extended to multidimensional nonlinear inverse problems and optimized for fast numerical solution. The resulting solution is guaranteed to be spatially and temporally smooth and to agree with input data within measurement error. The system automatically estimates the GPS measurement noise and receiver-transmitter biases. We propose to validate our algorithm using real and synthetic data, identify limitations in the approach as the number of GPS receivers is reduced from many to few or even a single GPS receiver (such limitations will be addressed in Phase II), and consider the incorporation of models for quasi-deterministic ionospheric features such as the subauroral trough/boundary blob and equatorial plumes to provide an alert function for anomalous ionospheric conditions.

* information listed above is at the time of submission.

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