An Investigation of a GPS Adaptive Temporal Selective Attenuator

ILIR F. PROGRI, WILLIAM R. MICHALSON, GENE BOGDANOV, and VIKRAM C. RAMANNA

Peer Reviewed

Abstract:	A GPS adaptive temporal selective attenuator (ATSA) can be used to suppress the effects of undesired narrowband signals. A GPS ATSA can be modeled as a discrete finite impulse response (DFIR) filter, where the filter’s impulse response coefficients can be selected by minimizing the undesired signal over desired signal ratio (UDR). The UDR, which directly represents the GPS ATSA performance, depends on the filter size, the temporal delay, the sampling frequency, and the desired signal frequency. A methodology for properly selecting the temporal delay and the sampling frequency for a given filter size and desired signal frequency is analyzed and simulated. The analysis and simulation results are validated using an implementation of an example ATSA on the TI C6711 digital signal processor (DSP). For a given GPS ATSA architecture (i.e., a given desired signal frequency and sampling frequency), optimum tap spacing can be selected, regardless of the jammer frequency. Some of the lessons learned during this investigation could be particularly valuable for ATSAs or analogous systems that will operate on the L5 frequency.
Published in:	NAVIGATION: Journal of the Institute of Navigation, Volume 49, Number 3
Pages:	137 - 148
Cite this article:	PROGRI, ILIR F., MICHALSON, WILLIAM R., BOGDANOV, GENE, RAMANNA, VIKRAM C., "An Investigation of a GPS Adaptive Temporal Selective Attenuator", NAVIGATION: Journal of The Institute of Navigation, Vol. 49, No. 3, Fall 2002, pp. 137-148.
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