| 摘要 |
PURPOSE:To prevent missing of synchronization due to a radio fault in a building or a tunnel or the like by applying re-synchronization acquisition to the missing of synchronization in a proper timing, and keeping excellent communication. CONSTITUTION:A CPU 3 gives a synchronization acquisition command to a synchronization acquisition device at the start of reception, and the synchronization acquisition device starts searching. When the synchronization acquisition device detects the synchronization between a received code and a local code, the synchronization acquisition device stops the searching and sends a signal representing detection of synchronization to the CPU 3. Upon the receipt of the synchronization detection signal, the CPU 3 enters the usual reception state and a tau dither 1 starts tracing. The CPU 3 uses an interval timer to apply synchronization monitor operation for each 1sec. When no DEMOD lock signal is confirmed, the CPU 3 is in standby for 5sec and further in standby for 5sec when it is confirmed that a flag is not received within a prescribed period and the CPU 3 sends a reacquisition command when no TD lock signal is confirmed. |
