中文摘要：

提出了一类新窗——组合双窗，其由传统的组合余弦窗通过卷积运算生成．该类窗构造简单，具有旁瓣衰减速率快，更好地抑制频谱泄漏影响等特点。应用于相位差测量，有效地减小了非同步采样情况下由于频谱泄漏而引起的测量误差，对谐波和噪声具有较好的抑制作用，能获得比同类传统组合余弦窗更高的计算精度。实验仿真验证了该算法的可行性和有效性。

英文摘要：

A new kind of windows called double-windows, which was developed by convolving conventional cosine window, was proposed. The kind of windows has advantages of simple structure, lower attenuation and good inhibition of spectral leakage. When applying to phase difference measurement, it can reduce the measuring error caused by spectral leakage in the case of asynchronous sampling and has strong anti-disturbance capability. The new method measures phase difference more accurately than conventional method of cosine window. The feasibility and effectiveness of the new method based on double-windows is verified by the results of simulation.