New decision variables for GNSS acquisition in the presence of CW interference

This paper investigates the problem of Global Navigation Satellite System signal acquisition using a consumer-grade receiver in the presence of continuous wave interference. By examining in detail the impact of interference on the acquisition search space, a set decision variables are developed. These decision variables leverage the systematic properties of the interference observed in the search space, manipulating or differencing portions of it to achieve improved detection performance. Strategies based on these variables are examined under a selection of operating scenarios including acquisition in the presence of interference when the receiver has some, or has no, a priori information regarding the interference. It is shown that a receiver employing these new schemes can tolerate up to 10 dB more interference power than a traditional receiver.