| 摘要 |
PURPOSE:To attain stably a delicate synchronization tracking by using the frequency divider of output phase variable type and adjusting the output phase of the frequency divider. CONSTITUTION:A signal generated from a pseudo noise generator 18 is fed to a phase shifter 11, from an output terminal of which a signal having a different phase from each bit is outputted. When no synchronization is taken, a control section 15 generates a 0 level signal from a terminal 15d and a pseudo noise generator 18 generates the 2nd pseudo noise signal. When a reception signal is inputted at a time t1 and the tracking of synchronization is started, a bit string of the reception signal is compared with the 2nd pseudo noise signal at every prescribed period and both the signals are coincident at a time t2 and the synchronization is taken. When the correlation between the reception signal and the 2nd pseudo noise signal is taken in any of correlation devices 1a-1c, the control section 15 generates a one level control signal from the terminal 15d. Thus, the pseudo noise generator 18 generates the 1st pseudo noise signal in place of the 1st pseudo noise, the numbers of bits of the input signal and the pseudo noise signal are coincident and the synchronization acquisition is attained. |
