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.
出处
《现代防御技术》
北大核心
2013年第6期55-60,75,共7页
Modern Defence Technology
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
space filter
well-distributed circle symmetric antenna array
multiple signal classifica-tion（ MUSIC ） algorithm
signal-to-noise ratio（SNR）
