Recent years, the GNSS has a diverse and wide application field. It provides the services that using the personal location information. But, for the some people, it is undesirable service. Therefore, these people start using the Personal Privacy Devices. A study about the impact of PPDs and effective countermeasure to PPDs are required. In this paper, we analyze the effect on the anti-jamming technique by the PPD jammer. And we have trying some methods to mitigate the effect of frequency swept jammer. We use the past sample data of incident signal on array antenna when performing the anti-jamming technique. And apply the reduced-rank approach too. Finally, we describe how to mitigate the effect of the frequency swept jammer to the anti-jamming technique.

Keywords: anti-jamming, array processing, frequency swept jammer, spatial nulling, power minimization