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24 December 2003 Broadband interference mitigator for global positioning system using time-frequency domain excision filtering
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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.
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Mark D. Silvius, Alan R. Lindsey, and David H. Hughes "Broadband interference mitigator for global positioning system using time-frequency domain excision filtering", Proc. SPIE 5205, Advanced Signal Processing Algorithms, Architectures, and Implementations XIII, (24 December 2003); https://doi.org/10.1117/12.506102
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