| 摘要 |
PURPOSE:To make reflection searching free from interference and disturbance possible by causing random number changing of transmission periods. CONSTITUTION:A transmission part 3 is controlled by way of a random number generating part 5 and a transmission timing pulse generating part 4, and electromagnetic pulses are transmitted at the timing when the periods differ at random from a transmitter-receiver 1. The reflected waves of these transmission pulses from an object are received and the identification of the correct reception pulses and the reception pulses by the direct reception of the transmission pulses from other ship, etc. is accomplished by the correlations between the storage contents of the A/D converted plural reception pulses and the patterns of the transmission pulse periods of the generating part 4. Hence, the accurate reflection searching is accomplished without interference and disturbance. |
