相关峰细化的精确时延估计快速算法研究

研究精确计算相关峰的方法,提高时延估计精度,改进传统的CZT算法,计算细化的频谱,降低了标准FFT计算带来的栅栏效应,利用互谱的前后两段计算相关函数的主峰波形,并建立了新的快速变换算法(FICP),相关峰可以任意“插值”而不增加计算量。采用该方法和模型,可以有针对性地利用有限范围频谱,抑制宽带噪声对时延估计的影响,提高相关峰的检测精度。

Algorithm study of fast and accurate time-delay estimation with fine interpolation of correlation peak

A new way of computing accurate correlation peak to increase accuracy of time-delay estimation is studied. A barrier affection caused by standard FFT calculation is reduced by calculating signal's fine spectrum with a modified Chirp z transform. A new fast algorithm of the transform FICP (Fine Interpolation of Correlation Peak) was created to compute waveform of the main correlation peak only using the main segment of the cross power spectrum. The peak can be interpolated in any accuracy without increasing calculation. The accuracy of TDE(Time-Delay Estimation) has been increased. With this way and model, interference coursed by broadband band noise can be reduced by using limited spectrum of the signal. The correlation peak will be detected precisely.