Effects of wide band interference to GPS C/A code

The NAVSTAR global positioning system (GPS), a networked system providing three-dimension user position and timing, is widely used during the past ten years. However, interferences to GPS introduce great dangers to GPS users. This paper gives an assessment of interferences to the GPS positioning signal. The work is mainly concentrated on effects of wide band interferences. Effects of traditional interferences such as continuous wave (CW), as well as broadband noise and pulse interference are studied. Furthermore, according to the GPS' s signal characteristics, another kind of wideband interferences, named m sequence interference, is also studied. Simulation results show that m sequence interference is the most harmful to GPS C/A code if special m sequence is adopted and thus special countermeasures should be used to eliminate this effect.