| 摘要 |
<P>PROBLEM TO BE SOLVED: To accurately measure the propagation delay time by acquiring a frequency transfer function by reducing the degradation of SNR and then performing high-resolution processing. <P>SOLUTION: This propagation delay time measuring device comprises a cross correlation function calculation section for calculating a cross correlation function of a received diffusion signal and a reference signal, a self correlation function calculation section for calculating a self correlation function of the reference signal, first and second extraction sections for extracting the periphery of each peak value of the cross correlation function and self correlation function, first and second Fourier transforming sections for acquiring first and second frequency functions by Fourier transforming the periphery of each peak value of the cross correlation function and self correlation function, a division section for acquiring a frequency transfer function by dividing the first frequency function by the second frequency function in a frequency range for reducing the degradation of the SNR, and a high-resolution processing section that separates a multi-path wave included in the peak value of the cross correlation function based on the frequency transfer function and calculates an evaluation function indicating a true time delay of the received diffusion signal. <P>COPYRIGHT: (C)2008,JPO&INPIT |
