基于阵列平移的GPS相干干扰抑制技术

Coherent Interference Mitigation Based on the Array-Shifting in GPS Receiver

基于空间平滑预处理技术的波束形成算法虽可抑制相干干扰,但会损失阵列孔径且只适用于等间隔线阵。因此,提出一种适用于圆形天线阵列的抗相干干扰的波束形成预处理方法,该方法对真实阵列进行虚拟平移得到多个虚拟阵列,求多个虚拟阵列各自的信号协方差矩阵后求平均,得到预处理后的协方差矩阵。结合功率倒置波束形成算法仿真,其结果表明此方法对相干干扰具有良好的抑制效果,并且抑制深度与算法的收敛性受平移距离的影响。

Although the approach of spatial smoothing is often applied to suppress coherent interference,it has a low utilization ratio of arrays＇ aperture and only can be used in uniform line array. So a new method,which is used in uniform circle array, is proposed in order to suppress the coherent interference. The real array is virtually shifted in this method,and several virtual arrays are generated after the virtual shifting. Then by averaging the virtual arrays＇ covariance matrix, a required covariance matrix is obtained. In succession, combining the power inverse wave - formation algorithm, the simulation results obtain and confirm the availability of the new method in case of suppressing coherent interference, the influence of different shifting length on wave - formation.