针对目标信源数未知时的时延差估计问题，该文提出一种基于时延差方差加权的时延差估计方法。该方法利用目标辐射信号频率单元对应时延差估计比较稳定，噪声频率单元对应时延差估计比较随机的特点，对各频率单元的时延差估计结果进行时延差方差加权，突出信号所占频率单元时延差估计结果，实现对目标信源数未知时的时延差估计。在该文仿真条件下，相比一般分频带互相关法，该方法对信噪比的鲁棒性提高了3 dB。理论分析和实验结果表明：该方法对信源数和信噪比的鲁棒性好于一般分频带互相关法。%A weighted estimation method based on the Time Delay Difference (TDD) variance is proposed with regard to the problem of TDD estimation of unknown source. This method utilizes the TDD of the target radiation signal frequency unit and the TDD of the noise frequency unit with respective characteristics of being stable and random to weight TDD estimation results of each frequency unit, enhancing the TDD estimation results of signal frequency unit, and achieving the TDD estimation of unknown source. The simulation results show that, compared with the conventional cross-correlation method, the estimation performance of this method is improved 3 dB. The theoretical analysis and simulation results both show that the robustness of this method is better than the conventional cross-correlation method.
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