【摘要】 阐述了噪声抵消时延估计法(Time Delay Estimation based on Noise-canceling,TDENC)的基本原理,建立了TDENC分析的估计模型;并进行了大量仿真计算和初步海上试验。仿真结果表明:低信噪比且干扰噪声间相关性较强时,TDENC估计延时明显优于常规方法,但其主峰较宽;干扰噪声间彼此相关但信噪比高,估计时延精度则较差。海上试验结果和理论仿真一致。更多还原

【Abstract】 A time delay estimation method based on noise canceling called TDENC(Time Delay Estimation based on Noise-Canceling) is proposed to improve the time delay estimation performance when the background noise is correlative. A TDENC model is formed firstly in this paper, and then computer simulations are carried out to study the performance and applicable range of TDENC. Simulation results show that in the case of low SNR and strong correlation between noises, TDENC method is obviously superior to the conventional methods, but the main lobe is broad. However, when SNR is high, the performance of TDENC is worse than the conventional method. The experimental data processing results agree well with the simulation.更多还原