The environment of radio reconnaissance is signal-intensive, and multiple signals may come into the bandwidth range of receiver simultaneously, many of which are cyelostationary ones. The spectral correlation of cyclostationary signals has signal selection capability. Based on the spectral correlation of cyclostationary signals, the paper studies a method of time difference of arrival （TDOA）estimation. Theoretical research and computer simulation indicate that the new method can achieve exact TDOA estimation of each signal in the environment of multiple signals. Compared with general cross correlation method, it has better anti-jamming capability.%在现代无线电侦查所处的环境中，信号数量多，且复杂密集，通常会有多个信号同时进入接收机带宽范围。进入接收机的很多信号是循环平稳信号，循环平稳信号的谱相关特性具有选择信号的能力。基于循环平稳信号的谱相关特性，研究了一种可以对多信号进行时差估计的方法。理论分析和仿真验证表明，在多信号环境下，该方法可以准确估计各个循环平稳信号的时差，与广义互相关方法相比，该方法具有较强的抗干扰能力。
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