| 摘要 |
A transmitter (20) sending at least one beam of radiation (10) and a first coding circuit to modulate the transmitting device in order to transmit position data by varying the pulse separation of the radiation. A receiver 25 attached to the moving object demodulates at 100 the received guidance data intended for a fin control circuit. The demodulated data is compared at 172 with outboard generated coded signals from 170 to validate the received control data. The on board code generator 170 is initialised before launch by a connection 150, 155 between itself and the transmitter coding circuit 70. The system is thereby more resistant to jamming. <IMAGE> |
