摘要
提出将SPWVD与WVD结合,得到没有交叉项、高分辨率的时频分析算法.首先由低分辨率但稳健的SPWVD给出信号时频分布的大概区域,然后对SPWVD结果运用阈值处理来提高算法的运算速度和信噪比;再利用处理过的结果对高分辨率但不稳健的WVD时频图进行加权处理.为提高该方法的性能,还着重研究了阈值的选取问题,给出了不同信噪比条件下最佳阈值选取范围.仿真实验证明所提方法得到的结果既能保证分辨率又能兼顾稳健性.
A time-frequency analysis algorithm featuring high resolution and no cross product term is put forward by combining SPWVD with WVD. Firstly, SPWVD with low resolution but high robustness is used to give a probable area of the signal in time-frequency domain. Then a threshold is set to improve the operational speed and SNR of the algorithm. Finally, the disposed result is used to make weighted processing of the WVD which has high resolution but low robustness. For improving performance of the method, the problem of threshold selection is analyzed and the best thresholds under different SNR are given. The simulation shows that the method can gain a result with a high robustness and resolution
出处
《战术导弹技术》
2011年第3期112-117,共6页
Tactical Missile Technology
