| 摘要 |
The invention relates to remote distance measurement by means of a transmitted noise modulated probing signal (E), whereby at least one of a distance (Y(t)) and a velocity (V(t)) in relation to a signal transceiver (200) is determined. The probing signal (E) is generated on basis of at least one first noise signal (x1(t), x2(t)). The transmitted signal (E) is presumed to be reflected to the signal transceiver (200) via at least one signal reflecting object in the form of an information carrying signal (e). This signal thus constitutes a delayed and possibly doppler shifted version of the transmitted signal (E). Moreover, according to the invention, a second noise signal (x2(t)) is added either to the probing signal (E) before it is transmitted or to the information carrying signal (e) before information pertaining to the reflecting object is derived there from. A primary signal (P1(x1)) is generated, which is based on the first noise signal (x1(t)) and a secondary signal (P2(x1, x2)) is generated, which is based on the information carrying signal (e). Thanks to the contribution from the second noise signal (x2(t)) the subsequent signal processing of the primary signal (P1(x1) and the secondary signal (P2(x1, X2)) can be performed with a high linearity at the same time as a comparatively simple equipment can be utilized for digitizing (240) signal components (SI, SQ; RI, RQ), which have been demodulated from the primary signal (P1(x1)) and the secondary signal (P2(x1, x2)) respectively. The solution according to the invention is also applicable at remote distance measurement by means of a digital group antenna system.
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