CAJ | 학술논문

该文提出一种基于修正 Hermite 函数的广义多窗 S 变换方法，并将之应用于复杂多分量辐射源信号的瞬时频率结构分析。该方法通过引入频率尺度因子修正正交 Hermite 函数，将多窗时频分析方法推广到 S 变换中，使得改进后的广义 S 变换既保留了多分辨特性，又很好地解决了高频区存在的频率分辨率低、易受噪声干扰等问题。与 S 变换和原始多窗时频分析方法相比，该方法在瞬时频率估计精度和时频聚集性等方面均有明显改善，具有很好的工程应用前景。
해문제출일충기우수정 Hermite 함수적엄의다창 S 변환방법，병장지응용우복잡다분량복사원신호적순시빈솔결구분석。해방법통과인입빈솔척도인자수정정교 Hermite 함수，장다창시빈분석방법추엄도 S 변환중，사득개진후적엄의 S 변환기보류료다분변특성，우흔호지해결료고빈구존재적빈솔분변솔저、역수조성간우등문제。여 S 변환화원시다창시빈분석방법상비，해방법재순시빈솔고계정도화시빈취집성등방면균유명현개선，구유흔호적공정응용전경。
A new method called generalized Multi-Window S-Transform (MW-ST) is proposed for blind Instantaneous Frequency (IF) analysis of complex emitter signals. The high concentration is achieved by employing the modified Hermite function. In this distribution, the orthogonal Hermite function is improved by utilizing a frequency parameter. Therefore, the multi-window method can be introducing to S-transform. The generalized MW-ST maintains the multi-resolution characteristics of the ST and improves the frequency resolution in high frequency region. Comparing with the origin S transform and the multi-window method, the proposed method can effectively improve the accuracy of the IF estimation and the time-frequency concentration. So it has the good prospects for engineering applications.