Algorithms for Removing Narrow-band Interference Based on Software GPS Receiver

Since there are many problems using traditional anti-jamming methods in hardware receiver,such as high cost,big system,high power and environment constraint,two methods are proposed based on software GPS receiver,one is time domain filtering algorithm based on subspace technique and the other is frequency domain filtering algorithm in which the extended extrapolation algorithm is proposed to avoid signal distorted due to component of jamming signal frequency zero set,and the estimated signal within the interference band are acquired after extended extrapolating.The experimental results show these two algorithms all can remove interference effectively and reliably;and frequency domain filtering algorithm based on extended extrapolation is better than time domain filtering algorithm.