A Methodology to Determine the Isolation Requirements Between Collocated Cellular and GPS Antennas in Telematics

This letter provides a methodology that includes theoretical analysis and measurements to determine the required isolation between a cellular transmitter, which consists of a class I AMPS and a class III CDMA 800, and a GPS receiver with collocated antennas. The method proposed in this letter can be used to determine isolation requirements between other cellular-based transmitters and a GPS receiver with collocated antennas.