基于GPS软件接收机的抗窄带干扰方法

针对硬件接收机中传统抗干扰方法成本高、体积大、功率大和环境受限等问题,提出了用GPS软件接收机作为抗干扰算法研究平台,用子空间分解的时域滤波法和频域滤波法消除窄带干扰,其中频域滤波法中干扰频率分量置零有时会引起信号在时域波形畸变。为了解决该问题,提出了用广义延拓插值法,得到干扰频带去除干扰后的广义延拓插值估计信号。实验仿真结果表明,两种方法都能有效而可靠地去除窄带干扰,基于广义延拓插值的频域滤波法更显其优越性。

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.