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Proceedings Paper

Broadband interference mitigator for global positioning system using time-frequency domain excision filtering
Author(s): Mark D. Silvius; Alan R. Lindsey; David H. Hughes
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Paper Abstract

This paper explores methods to excise broadband interference signals from a Global Positioning System (GPS) spread spectrum signal using bilinear transformations. The Wigner-Ville Distribution allows for signal and jammer time-frequency characterization. The jammer signals, identified in the Time-Frequency (T-F) domain, are excised by zeroing peak amplitudes above a statistically determined detection threshold. The GPS signal is synthesized using inverse Wigner transform involving least squares amplitude and phase matching. Pre-processing increases Pseudo-Random Noise (PRN) correlator performance due to significant reduction in effective Jammer-to-Signal ratio (JSR). The proposed technique improves receiver robustness for large classes of broadband jammers, not limited to instantaneously narrowband jammers with a constant modulus or well defined instantaneous frequencies, while improving bit-error-performance and GPS Coarse Acquisition (C/A) and tracking in hostile interference environments.

Paper Details

Date Published: 24 December 2003
PDF: 12 pages
Proc. SPIE 5205, Advanced Signal Processing Algorithms, Architectures, and Implementations XIII, (24 December 2003); doi: 10.1117/12.506102
Show Author Affiliations
Mark D. Silvius, Air Force Research Lab. (United States)
Alan R. Lindsey, Air Force Research Lab. (United States)
David H. Hughes, Air Force Research Lab. (United States)


Published in SPIE Proceedings Vol. 5205:
Advanced Signal Processing Algorithms, Architectures, and Implementations XIII
Franklin T. Luk, Editor(s)

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