| 摘要 |
PURPOSE:To make quickly the synchronous search of a pseudo random code for signals which are received by a spectral diffusion communication machine. CONSTITUTION:A GPS receiving unit 10 is furnished on a signal transmitter 1, and a counter 16 (pseudo random code) is reset with each timing signal emitted at 100mus intervals from this receiving unit 10. Another GPS receiving unit 30 is installed in a signal receiver 2, and a shift counter 39 is started with each timing signal emitted at 100mus intervals from this receiving unit 30. The shift counter 39 counts the preset values (shift amount) which are set by a shift amount setting counter 38, and a counter 34 (pseudo random code) is reset when this counting is ended. The shift amount is set by the counter 38 as mentioned, wherein its counting-up takes place until a synchronization sensor 37 senses synchronizing of the pseudo random code, and the synchronizing point is sought while the shift amount is varied. |
