UWB Coexistence with GPS and Aggregate UWB Noise Rise in the Selected Radio Bands

This paper presents results of coexistence measurement studies between multiple ultra wideband (UWB) transmitters and a global positioning system (GPS). In addition, mathematical models for UWB aggregate noise rise in the GPS, universal mobile telecommunications system (UMTS) and wireless local area network (WLAN) 802.11a/g bands are illustrated. In GPS coexistence measurements, a realistic satellite constellation and outward circumstances were created using a commercial GPS simulator and receiver. Each measurement was carried out using Federal Communications Commission (FCC) compatible prototype singleband UWB transmitters. The measurements took place in an anechoic chamber to minimize any radio interference. The results clearly show that GPS can survive even under a large number of interfering UWB devices which are operating using realistic transmission parameters. Still, if a large number of interfering UWB devices or high UWB activity factor and pulse repetition frequency is used UWB can be regarded as a threat to GPS usage.