DOT GPS ADJACENT BAND COMPATIBILITY TESTS

摘要

he Adjacent Band Compatibility Assessment evaluated the adjacent radiofrequency band power levels that can be tolerated by GPS and GNSS receivers, to advance the U.S. Department of Transportation's understanding of the extent to which such power levels impact devices used for transportation safety purposes, among other applications. The paper describes the testing approach and data analysis used to develop interference tolerance masks (ITMs) based on a 1-dB carrier-to-noise-ratio (CNR) degradation. DOT and other participants tested 80 GPS/GNSS receivers in an anechoic chamber. Four types of testing were conducted which involved a linearity test, 1 -MHz Bandpass Noise, 10-MHz Long Term Evolution (LTE), and effects of third order intermodulation.