| 摘要 |
<p>PURPOSE: To reduce cost, to miniaturize a spectrum diffusion signal receiver, to reduce power consumption and to improve quality by making the device into digital high integration and into software. CONSTITUTION: I-data from LPF 64 is taken in and Q-data from LPF 65 is taken in so as to obtain an absolute value. They are added and an added result is obtained. A switch signal from an Earely rate switch 53 is referred to and a present mode is discriminated. A correlation between the pseudo noise code of a reception signal and a pseudo noise code from a code generator 51 is discriminated on a feedback loop. Namely, a system does not immediately moves to correlation search even if it is discriminated to be correlation non-lock when correlation lock is once detected in the feedback loop 50. Thus, the system does not move to the operation of correlation search, which takes long time, for instantaneous time even if correlation non-lock is detected, for example. Thus, the signal can stably be received even if an instantaneous reception fault exists.</p> |
