| 摘要 |
PURPOSE:To enable high-reliability synchronization without generating imbalancing correlation outputs by obtaining a required phase comparing characteristic close to phase difference '0' by correlating with a Manchester coding pseudo noise code. CONSTITUTION:Since a PN code is formed to be a Manchester code, one correlation device 24 can obtain a control signal required for a voltage control clock generator 1. Namely, a DS diffusion signal and the Manchester-coded PN code are multiplied by a multiplier 29, and integrated by an integrator 30 to calculate correlation and only by passing the result through a loop filter 10, a phase locked loop can be constituted in using the result as the control signal of the voltage control clock generator 1. In such a case, since the peak of correlation is generated at a position shifted from the phase difference '0' for almost 2DELTA/3, for the demodulation, it is enough only to obtain the correlation between the PN code, which is shifted only for 2DELTA/3 phase by a 2DELTA/3 delay circuit 31, and the DS concrete signal. |
