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阿仑方差的频域传递函数有一定的带通特性,但通带太宽,副瓣幅度大,无法用于频谱测量。本文用时域修正的方法引出了哈达玛方差、修正的哈达玛方差和高阶差分方差,其频域传递函数有良好的带通特性,可用来对高稳定度的振荡源输出信号进行频谱分析。
The frequency-domain transfer function of the Allan variance has certain band-pass characteristics, but the passband is too wide and the amplitude of the side-lobe is large, so it can not be used for spectrum measurement. In this paper, the Hadamard’s variance, the modified Hadamard’s variance and the high-order difference variance are introduced by using the time-domain correction method. The frequency-domain transfer function has a good band-pass characteristic and can be used to analyze the spectrum of the output signal of a high-stability oscillator.