| 摘要 |
<p>PROBLEM TO BE SOLVED: To improve the time resolution of a receiver and to provide an accurate correlation value by providing a code output control part for accepting an inverse spread code PN outputted in every tip cycle (Tc) from an inverse spread code generating part and generating the inverse spread code PN delayed from the phase of this code for Tc/2. SOLUTION: An A/D converter 2 of the correlative receiver is a section for accepting a signal received by an antenna 1 and A/D converting that signal and samples the signal ordinarily for each Tc/2 cycle. Based on the control of a control part 8, an inverse spread code generating part 3 generates the inverse spread code PN of the prescribed phase and transfers it to a code output control part 7. An inverse spread part 4 multiplies the inverse spread code PN accepted from the code output control part 7 to an input signal. Din accepted from the A/D converter 2 and inversely spreads that signal. An accumulation part 5 accepts a response signal inversely spread by the inverse spread part 4 and accumulates that signal for all the cycle of the inverse spreading code PN. A correlation value calculating part 6 accepts a cumulative value and finds the correlation value of its absolute value.</p> |
