跳频信号侦察中空时频测向算法  

Spatial-Time-Frequency Direction-of-Arrival Estimation Algorithm for Scouting Frequency-Hopping Signals

作　　者：卢树军[1,2] 李英林 刘维 贾凤宝 

机构地区：[1]国防科技大学电子科学与工程学院 [2]解放军69006部队

出　　处：《现代军事通信》2014年第1期12-16,共5页

摘　　要：经典的空时频测向算法TF-MUSIC计算量大，而且没有针对信号的时频特征设计适当的核函数，用于跳频信号侦察时存在诸多困难。为提高TF-MUSIC算法的实用性，文章针对信号的时间宽度和频率宽度设计可变的核函数，提出了基于可变核函数的VCFTF-MUSIC算法。这种简化算法显著降低了计算量，可以保证DOA估计的稳健性，适于对跳频信号等非平稳信号的侦察，但DOA估计性能相较于TF-MUSIC算法稍有下降，数值仿真验证了上述观点。The classic Time-Frequency MUSIC algorithm engrosses a lot of calculation, and can not adapt to signals with different time-frequency characteristics. These problems obstruct the application in scou- ting frequency-hopping signals. To overcome them, an algorithm with variable core functions is proposed in this paper, which is propitious to different signals and embedded into Time-Frequency MUSIC. This al- gorithm, abbreviated as VCFTF-MUSIC, engrosses less calculation than classic TF-MUSIC algorithm and enhances the stability of spatial-time-frequency DOA estimation, but endures a slight DOA estimation per- formance degradation caused by calculation simplification. The proposed algorithm is suitable for scouting frequency--hopping signals. Simulation results confirm the feasibility and superiority of the proposed algo- rithm.

关 键 词：跳频信号侦察 可变核函数 时频分析 空时频测向 

分 类 号：TN958[电子电信—信号与信息处理]