METHOD AND DEVICE FOR MONITORING SPECTRUM DIFFUSING SIGNAL BY RADIO STATION

摘要

PURPOSE:To monitor an SS singnal, by multiplying the SS signal which has been delayed, by that which has not been delayed, and reproducing a PN code which has been delayed by a prescribed time when a difference component has been selected, in the DS (Direct Sequence) system of a spread spectrum (SS) communication system. CONSTITUTION:An SS signal S(t) of an input terminal 1 of basic circuits 9, 9 is multiplied by a delaying circuit 3 of (n) chips by a multiplier 4, and as for its output S(t)XS(t-nDELTA), the output terminal obtains a signal from which a double wave has been removed, by a low-pass filter (LPF)5. An SS signal which has been received by an antenna 7 is limited as to its band by a band pass filter 8, and after that, is made to branch, is inputted to the basic circuit 9 having a delaying circuit of (n) chips, and the basic circuit 9' having a delaying circuit of (n') chips, an output signal from 9' is inputted to a multistage delaying circuit 10 having an output at every 1 chip delay, an output signal from a switching circuit 11 which has been changed over by a controlling circuit 15 becomes same as an output signal from the circuit 9, a signal which is in phase from a multiplier 12 becomes a DC component, and it is converted to receiving electric power by an integrated network 13, by which recording is executed.