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Comparison of Narrowband Adaptive Filter Technologies for GPS
March 2000
Robert Rifkin, The MITRE Corporation
John J. Vaccaro, The MITRE Corporation
ABSTRACT
Narrowband interference can seriously degrade the performance of GPS
systems. Several techniques exist for reducing this interference, including
adaptive transversal filters, overlapped FFTs, and filter banks. All
these techniques attempt to filter out the interference before the GPS
receiver performs correlation. This paper compares these three interference
suppression techniques for application to GPS. Likely VLSI-based designs
with various levels of complexity (i.e., operation counts) for each
technique are proposed and described. The effects of these designs as
pre-processors on GPS ranging performance is then compared using computer
simulation.
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