Time Delay Estimation Using Cross-power Spectrum Phase
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摘要: 时延估计(TDE)是水声领域的重要研究课题，基于时延估计的水声目标被动测向、被动定位技术是水声目标无源定位的重要分支。目前，较为常用的时延估计方法有基本互相关法(NCC)、广义互相关法(GCC)、自适应时延估计(LMS)等。不同于以上方法的思路，该文利用两路信号的互谱相位(CSP)设计了一种时延估计的新方法，该方法将互谱相位进行傅里叶变换，利用其变换域估算相位斜率以求取时延，能够实现多目标分辨、消除时延估计模糊与背景起伏。仿真实验证明，该方法效果要优于基本互相关，广义互相关等方法。Abstract: Time Delay Estimation(TDE) is an important research subject in underwater acoustic field. Passive direction-finding and passive location based on TDE are important brunches in passive location of underwater acoustic target. At present, the common TDE methods include Normalized Cross Correlation(NCC) method, Generalized Cross Correlation(GCC) method and Least Mean Square(LMS) method. Different from the above methods, a new method of TDE is designed by using Cross-power Spectrum Phase(CSP) in this paper. This method performs Fourier transform of CSP and uses the transform domain to estimate the CSP slope to get the time delay. This method can realize multi-target resolution and eliminate the ambiguity and background fluctuation. Simulation results show that this proposed method is better than NCC and GCC.
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表 1 3种算法噪声RMSE均值对比
信噪比 –10 dB –5 dB 0 dB 5 dB 10 dB NCC算法噪声RMSE 0.0387 0.0242 0.0121 0.0100 0.0094 GCC算法噪声RMSE 0.0289 0.0172 0.0078 0.0058 0.0050 FCSP算法噪声RMSE 0.0162 0.0055 0.0015 0.0013 0.0012 
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