CAJ | 학술논문

双谱由于和傅里叶变换存在一定变换关系，也存在栅栏效应，这给基于双谱的频率估计带来误差。为克服该效应，提出了双谱幅值模平方重心法，该方法以双谱幅值谱线的局域重心作为频率的估计值。仿真结果表明该方法的估计性能良好，且复杂度相对简单、运算量较小、实时性较强。同时为充分利用采样数据，采用不同方式构造出两组数据，再对这两组数据分别做双谱分析并估计正弦信号的频率和初相，最后进行平均处理，从而降低了估计方差，改善了估计均值，提高了估计性能。
쌍보유우화부리협변환존재일정변환관계，야존재책란효응，저급기우쌍보적빈솔고계대래오차。위극복해효응，제출료쌍보폭치모평방중심법，해방법이쌍보폭치보선적국역중심작위빈솔적고계치。방진결과표명해방법적고계성능량호，차복잡도상대간단、운산량교소、실시성교강。동시위충분이용채양수거，채용불동방식구조출량조수거，재대저량조수거분별주쌍보분석병고계정현신호적빈솔화초상，최후진행평균처리，종이강저료고계방차，개선료고계균치，제고료고계성능。
Related to Fourier transform, the bispectrum also has fence effect, which brings error to the bispectrum based frequency estimation. To overcome this influence, the bispectrum squared amplitude center method is proposed, which uses the local center of bispectrum lines to estimate frequency. Simulations show that this algorithm has good perfor-mance and less computation complexity. To make full use of the sampled data, two data sets are constructed to pursue bispectrum analysis. Thereafter, the frequency and initial phase of these two data sets are estimated respectively. Finally, average processing is performed to reduce the variance of estimation, so that improves the estimation performance.