Radar Ionospheric Impact Mitigation

Award Information
Agency: Department of Defense
Branch: Air Force
Contract: FA8718-07-C-0015
Agency Tracking Number: F061-250-1216
Amount: $742,609.00
Phase: Phase II
Program: SBIR
Awards Year: 2007
Solicitation Year: 2006
Solicitation Topic Code: AF06-250
Solicitation Number: 2006.1
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
 L.J. Nickisch
 Senior Research Scientist
 (831) 582-4905
Business Contact
 Joan Oltman-Shay
Title: President
Phone: (425) 644-9660
Email: contracts-grants@nwra.com
Research Institution
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 system for processing dual frequency GPS beacon data to produce a real-time dynamic ionospheric model. 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 GPS measurement noise and receiver-transmitter biases. We call this method GPSII, for GPS Ionospheric Inversion. In Phase I we validated GPSII using synthetic data and tested the performance of the method as the number of GPS receivers is reduced from many to few and even a single GPS receiver. In the Phase II effort we will refine this method and mature it for operational use and develop the capability to estimate and geographically display the validity/error bounds of its solutions. We will also consider methods of providing an alert function for anomalous ionospheric conditions for such features as the subauroral trough/boundary blob and equatorial plumes.

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

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