Novel techniques for multipath mitigation for airborne Global Positioning System (GPS) receivers

Award Information
Agency: Department of Defense
Branch: Navy
Contract: N68335-09-C-0251
Agency Tracking Number: N091-022-0717
Amount: $149,859.00
Phase: Phase I
Program: SBIR
Awards Year: 2009
Solicitation Year: 2009
Solicitation Topic Code: N091-022
Solicitation Number: 2009.1
Small Business Information
144 Research Drive, Hampton, VA, 23666
DUNS: 782587406
HUBZone Owned: N
Woman Owned: N
Socially and Economically Disadvantaged: Y
Principal Investigator
 C. Reddy
 President
 (757) 224-2035
 cjreddy@appliedem.com
Business Contact
 C. Reddy
Title: President
Phone: (757) 224-2035
Email: cjreddy@appliedem.com
Research Institution
N/A
Abstract
US Department of Defense is heavily dependent on the Global Positioning System (GPS) for geolocation, navigation, timekeeping and other military operations. Multipath due to the structure (platform on which the GPS receiver is mounted) scattering can degrade the accuracy of GPS measurements (code and carrier phase) by tens of centimeters. For an airborne platform, reflection or diffraction of the satellite signal from wings, tail, stabilizers or any other large appendage of the aircraft fuselage leads to signal multipath, and these multipath cause biases in code and carrier phase measurements. During this project, we propose to study the performance of two novel adaptive weighting algorithms in the presence of platform generated multipaths. The adaptive weighting algorithms are designed for GPS anti-jam antennas (CRPAs) to null the interfering signals without distorting the satellite signals. We will investigate the performance of the two weighting algorithms in simultaneous nulling of the interfering signals and mitigation of the platform generated multipath. The two weighting algorithms use the knowledge of the in situ antenna manifolds to minimize the distortion of the satellite signals. The sensitivity of the two algorithms to errors in antenna manifold will also be investigated. Our investigation will also include reduced size CRPAs whose foot print is limited to 5" in diameter.

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

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