摘要
利用相位干涉仪测量信号到达时差时,频率估计误差会引起测量误差,且现有方法对宽带信号适应性较差。针对这些问题,提出了利用信号频域互相关的相频曲线估计到达时差的方法。该方法利用短时傅里叶变换对宽带信号进行重构,并对重构信号在频域进行互相关,然后利用相频曲线的线性关系估计时差。该方法在低信噪比条件下对宽带信号的到达时差具有较高的估计精度。
In measuring time difference of arrival （TDOA） with phase interferometer,the precision of TDOA measurement is influenced by the error induced in frequency estimation,and the adaptability of existed methods for wideband signal is bad.Aim at these problems,a method to estimate TDOA using the phase-frequency curve acquired by correlation in frequency domain is proposed in this paper.The method firstly reconstructs the wideband signal using short Fourier transform （STFT）,and then obtains phase-frequency curve by cross correlation,lastly estimates TDOA based on the linearity of phase-frequency curve.The method is able to obtain better precision of TDOA for wideband signal under low lower signal noise ratio （SNR）.
出处
《国外电子测量技术》
2011年第10期17-21,33,共6页
Foreign Electronic Measurement Technology
关键词
短时傅里叶变换
相位干涉仪
信号重构
相频曲线
时差
short time fourier transforms （STFT）
phase interferometer
signal reconstruction
phase-frequency curve
time difference of arrival （TDOA）
