空域MUSIC算法在GPS抗干扰中的应用  

Application of Space Algorithm Based on MUSIC in GPS Antijamming

作　　者：王顿[1] 卢艳娥[1] 裴文林[1] 庞春雷[1] 

机构地区：[1]空军工程大学信息与导航学院,陕西西安710077

出　　处：《现代防御技术》2013年第6期55-60,75,共7页Modern Defence Technology

摘　　要：针对一般MUSIC（multiplesignalclassification）算法对负信噪比的GPS信号存在分辨率不高，干扰零陷位置不固定，输出信噪比偏低等问题，对此算法进行改进，将噪声（信号）子空间对应的所有特征值引入到加权向量的构造上，用噪声功率修正阵列方向图，通过选择合适的调整指数改善输出结果。仿真结果证明，改进后的算法使天线方向图干扰零陷位置比较固定，对GPS信号衰减比较小，输出信噪比提高了1～2dB，自相关性能有所提升。Aiming at common MUSIC （multiple signal classification） algorithm having low resolution ratio, unset interference null and low output SNR（signal to noise ratio）, the algorithm by putting all the eigenvalues corresponding with noise subspace into the construction of weighting vector is improved by u- sing noise power to correct array orientation picture and mending output result by means of selecting prop- er modification index. Simulation results show that the improved algorithm makes the jamming position fixed in array, decreases the weakening to GPS （global positioning system） signal, and improves the SNR 1 to 2 dB and performance of autocorrelation.

关 键 词：空域滤波 均匀圆对称阵天线 多重信号分类(MUSIC)算法 信噪比 

分 类 号：TN973[电子电信—信号与信息处理] P228.4[电子电信—信息与通信工程]