gps signals are typically weak and thus easily interfered with by other radio transmissions in the same or adjacent frequency bands . interference can be especially problematic when the gps receiver is co - located with a communications device that includes a radio transmitter , such as a cellular telephone . the transmitted signal from the co - located communication device can overload the gps receiver front - end designed to receive weak gps signals . in such a situation no useful information can be extracted from the received gps signals originating from the gps satellites . described herein is a novel apparatus and method that can be used to minimize the effect of co - located interference on a gps receiver .