| 摘要 |
PROBLEM TO BE SOLVED: To perform a sliding correlation operation through an analog circuit by integrating a mixed output signal of an objective code and a reference code having a period different, by a micro time, from that of the objective code. SOLUTION: A redundancy PN code generator 20 generates a reference PN code having such a period as added with a redundancy signal of sufficiently shorter time interval than the period of a PN code generated from a PN code generator. A mixer 21 in a correlation operating unit 13 has one input being fed with a PN code received by a receiver and the other input being fed with a reference PN code thereof. When the reference PN code is generated repeatedly, the time shift is accumulated and a time shift from the process starting time is generated as compared with the PN code. When the output from the mixer 21 is passed through a low frequency filter 22 having response characteristics and an integrated value thereof is determined, a sliding correlation value can be operated. |
