ABSTRACT
This chapter examines the applicability of multisensor subspace projection techniques for suppressing nonstationary jammers in global positioning system (GPS) receivers. GPS has found applications in land transportation, civil aviation, maritime commerce, surveying and mapping, construction, mining, agriculture, Earth sciences, electric power systems, telecommunications and outdoor recreational activities. The ever-increasing reliance on GPS for navigation and guidance has created a growing awareness of the need for adequate protection against both intentional and unintentional noise in the GPS frequency band — the former is generally referred to as jamming and the latter, interference. Jamming is a procedure that attempts to block reception of a desired signal by the intended receiver. Designers of military as well as commercial communication systems have, through the years, developed numerous antijamming techniques to counter these threats. Bilinear time–frequency distributions for signal power localization in the time–frequency plane have motivated several new effective approaches for excision of nonstationary jammers.
