The principles of several kinds of cyclic time-difference-of-arrival （TDOA） estimation methods are analyzed, and the methods are classified based on the principles. The relationship among these cyclic TDOA estimation methods is analyzed and demonstrated. The results show that the generalized cyclic cross correlation （GCCC） method is equivalent to the cyclic phase spectral method. The adaptive TDOA estimation with signal selectivity is the iterated realization of the spectral correlation ratio （SPECCORR） method. The correlated cyclic cross correlation （CCCC） and the spectral coherence alignment （SPECCOA） methods are special cases of the cyclic cross-ambiguity （CCA） function.%系统分析了几种循环时延估计方法的原理，并对循环时延估计方法进行了分类．论证了几种方法的相互关系，揭示了这些方法之间的内在联系．结果表明广义循环互相关法（GCCC）与循环相位谱法是等效的；信号选择性自适应法是循环谱相关法（SPECCORR）的迭代实现；循环互相关函数相关法（CCCC）和循环谱相干法（SPECCOA）是循环互模糊函数法（CCA）的特例．
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