GPS接收装置的射频干扰分析

Radio Frequency Interference Analysis in GPS Equipment

工程实际中,具有GPS接收功能的装置会与其它设备的射频源共存,这些射频源包括GSM、UMTS、WLAN、Bluetooth。指出这些射频源对GPS接收装置的干扰程度,明确哪种射频源对GPS接收装置的阻塞影响最大,同时提出相应的解决方案是关键。验证方法主要是基于Texas Instrument的GPS接收装置,接收由GPS卫星模拟器发出的GPS信息,由具备GSM、UMTS、WLAN、Bluetooth功能的外部设备分别对GPS接收装置发出不同的射频干扰信号。结果证明,工作在UMTS频段的设备,对GPS接收装置的阻塞影响最大,改善GPS接收装置中的带通滤波器性能,对抑制UMTS干扰信号有很好的作用。

In engineering application,GPS equipment coexist with radio frequencies which is used by other equipment,they are GSM,UMTS,WLAN and Bluetooth. The most important thing is how big the interference from those radio frequencies to the GPS receiver,and which one is the biggest,it also needs to get out the solution. The method is mainly used to input the interferernce signal from other equipment to the GPS receiver （Texas Instrument）,and GPS simulator sends the aiding data to GPS receiver. The important conclusion are when using UMTS signal as interferer to the GPS receiver,the blocking effect is even worse,improving the GPS receiver band pass filter performance can decreased this bad effect.