| 摘要 |
The invention involves the use of a complete injection signal having a digital spectrum made up of components weighted by a set of coefficients. In a preliminary step, the coefficients of the components included in said frequency band are attenuated, which leads to an incomplete digital spectrum being obtained; in a subsequent step (21), the analog signal formed from said incomplete digital spectrum is injected into the electric line; in a subsequent step (22), the echo corresponding to said injected signal is measured; in a subsequent step (23), the digital spectrum (Y cancel ) of said echo is calculated; in a subsequent step (24), the digital spectrum (Ŷ full ) of the echo of the complete analog signal is estimated, if said signal had been injected, the kth component (Ŷ fullk ) of the estimated complete digital spectrum being equal to the kth component (Y cancelk ) of the digital spectrum of the received echo multiplied by the ratio (ξ k ) of the kth component (X fullk ) of the digital spectrum of the complete injection signal to the kth component (X cancelk ) of the incomplete digital spectrum; and in a subsequent step (25), the measurement of the reflectogram of said line is obtained from the estimated complete digital spectrum (Ŷ full ). |
