Multi-Sensor Excision of Sparsely Sampled Nonstationary Jammers for GPS Receivers

Yimin D. Zhang, Ben Wang, Moeness G. Amin

Peer Reviewed

Abstract:	Anti-jamming capability is essential for reliable GPS operations in hostile environments. A large class of “smart” jammers assumes nonstationary frequency modulated (FM) waveforms. This makes jammer suppression difficult when using conventional jammer suppression methods, such as frequency-domain notch filters or time-domain gaiting. We utilize two important spatio-temporal properties of the jamming FM signals. The first property is the sparsity of the waveforms in the joint time-frequency domain in which the jammer energy is concen¬trated in narrow ridges across the time and frequency variables. The second property is the highly correlated jammer waveforms received by multi-antenna receivers, enabling the use of spatial degrees of freedom for effective jammer suppression and GPS signal preservation. In this paper, we develop novel techniques for FM jammer suppression of sparsely sampled GPS signals in the context of multi-sensor GPS receivers. The following important issues are addressed for the first time in this context: (a) We develop a multi-sensor data-dependent time-frequency kernel design method for suppression of noise-like artifacts arising from incomplete observations; (b) We utilize proper sparse compressive sensing techniques for FM jammer signature estimation that preserves phase information at each array sensor; (c) We develop multi-sensor array processing methodology that achieves effective jammer suppression and GPS signal preservation based on reconstructed group sparse data estimates and through the exploitation of spatial degrees of freedom offered by the sensor array; and (d) We examine the effect of different sparse sampling patterns and reveal that sensor-dependent missing samples is key to improved jammer signature estimation and jammer removal capability.
Published in:	Proceedings of the 28th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GNSS+ 2015) September 14 - 18, 2015 Tampa Convention Center Tampa, Florida
Pages:	3307 - 3313
Cite this article:	Zhang, Yimin D., Wang, Ben, Amin, Moeness G., "Multi-Sensor Excision of Sparsely Sampled Nonstationary Jammers for GPS Receivers," Proceedings of the 28th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GNSS+ 2015), Tampa, Florida, September 2015, pp. 3307-3313.
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