| 摘要 |
<p>The present invention relates to positioning of a mobile signal transmitter (MT), wherein a respective distance (DMT-100a-DMT-100d) between the transmitter (MT) and each of a plurality of sensors (100a-100d) is determined based on a direct sequence spread spectrum signal (SMT). A transmitter delay of the signal (SMT) is estimated with high accuracy by, in each sensor (100a-100d), cross-correlating an over-sampled representation of the signal (SMT) with an appropriate local spreading sequence (SPP), which contains poly-phased symbol values being different from a set of symbols in the direct sequence used to spread the transmitted signal (SMT). The local spreading sequence (SPP) has a nominal chip period, which is equivalent to the chip period of the over-sampled representation of the signal (SMT).</p> |
