从三点法定位原理出发，在分析时延差估计误差与时延估计误差关联性的基础上，通过将信道修正技术引入过门限时延差估计（直接法），改善时延差估计的稳定性，得到了改进的过门限时延差估计方法(修正法)。在研究分析信号时延与相移内在关系的基础上，根据误差理论，在高精度相位估计前提下，利用各相关参数估计误差对时延差估计误差的贡献大小以及贡献方式的差异，得到了时延差估计的整数倍周期误差修正方法。将修正法与直接法组合，联合使用三门限处理脉冲信号，可减小时延差估计误差，得到了联合多门限时延差估计方法。在理论分析的基础上，进行了实验验证。从三点法定位原理出发，在分析时延差估计误差与时延估计误差关联性的基础上，通过将信道修正技术引入过门限时延差估计（直接法），改善时延差估计的稳定性，得到了改进的过门限时延差估计方法(修正法)。在研究分析信号时延与相移内在关系的基础上，根据误差理论，在高精度相位估计前提下，利用各相关参数估计误差对时延差估计误差的贡献大小以及贡献方式的差异，得到了时延差估计的整数倍周期误差修正方法。将修正法与直接法组合，联合使用三门限处理脉冲信号，可减小时延差估计误差，得到了联合多门限时延差估计方法。在理论分析的基础上，进行了实验验证。

A reformed amplitude gated estimation method of time delay difference of signal impulses, i.e.an amendment method for short, is developed by introducing a channel equalization technique to its conventional version, which is called a direct method in this paper, so as to improve the stability of the estimation based on the analysis of error relativity between time delay difference and time delay estimation according to the principle of three-point location. After the inherent relationship between time delay and phase shift of a signal is analyzed, the multi period compensation method of estimation error is proposed by using the contribution of estimation error of concerned parameters to the estimation error of time delay difference and its different contribution modes under the condition of high precision phase estimation on the basis of the error theory. The amendment method and the direct method are combined into a cooperative multi amplitude gated estimation method which can process the signal impulses with three amplitude gates to reduce the estimation error of time delay difference of signal impulses. Experimental measurements are carried out to verify theoretical predictions.