时频分布级数方法的改进

The Improvement of Time-Frequency Distribution Series Method

时频分布级数法在保持高时频分辨率的前提下,有效抑制了Wigner分布的交叉项,但运算量问题制约了其在工程应用中的普及。该文在对时频原子基函数进行研究的基础上,利用窗口选择特性对方法进行了改进,节省了大量计算,通过对多分量非平稳信号的仿真表明,对TFDS方法的改进是有效的,信号处理时间明显缩短,对联合时频分析的工程应用具有一定的参考价值。

The time-frequency distribution series(TFDS) has been tested effective in the balance of the cross-term suppression and the time-frequency resolution. It is promising in the application of the target recognition. But the computational load is too large to bear with the length of the signal increasing. By getting ride of the redundant computing about the time-frequency atom, we overcome the difficulty. The simulation of the multi-component non-stational signal shows that the improvement of the TFDS method accelerates the computing. It can be consulted under the use of the real-time processing of the time-frequency characteristic of the target echo.