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中文摘要：
为了解决GPS子空间跟踪抗干扰的干扰维数估计问题,通过分析FAPI子空间跟踪算法,并讨论干扰维数的估计对算法性能的影响,利用GPS抗干扰的特殊性,提出基于部分协方差阵特征值分解的GPS＂有效＂干扰个数估计方法,并联合FAPI算法和本文提出方法,得到一种新型空时GPS子空间抗干扰方案.仿真结果表明＂有效＂干扰个数可以被实时准确估计,子空间跟踪误差同时能快速收敛.当取采样频率为4倍于GPS中频频率时约为400个采样点时间,验证了方案的有效性与实用性.
英文摘要：
In order to estimate the interference dimension in anti-jamming of GPS subspace tracking,by analyzing the FAPI subspace tracking algorithm and the effect of the interference dimension on the algorithm performance and by utilizing the particularity of GPS anti-jamming,a method to estimate the effective interference number base for the eigenvalue decomposition of the partial covariance matrix was proposed.A novel scheme for GPS space-time anti-jamming based on FAPI algorithm and interference subspace estimation was attained.The simulation results indicate that the real-time effective interference number can be estimated accurately and the subspace error converges rapidly.The time for sampling about 400 points was gained when the sampling frequency was 4 times of GPS intermediate frequency.The proposed scheme was shown to be valid and practical.
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