| 摘要 |
<p>PROBLEM TO BE SOLVED: To detect automatically a SART(Search And Rescue Transponder) signal and to aim speed-up of lifesaving, by executing correlative processing between a modulation component in a SART radio wave and a reference signal, and by separating from mixed radar reflected waves. SOLUTION: A signal processing device 2 inputs a received signal of a radar device 1, and a gate circuit 21 opens a gate. If an open time is a counting time equivalent to an IF bandwidth of the radar device 1, a counting circuit 22 sends the signal to a correlation circuit 23 and a gate control circuit 24. The gate control circuit 24 opens the gate by the signal as long as a time equal to the counting time at an arrival predicted time of the next SART signal, to put it into the waiting reception state. If a first reception signal is a SART signal, the signal is received at the next waiting time, and if there is no reception, the system is reset to return to the waiting state in the beginning. The correlation circuit 23 obtains correlation between the SART signal and a reference signal of a reference signal generator 26, and an averaging circuit 25 averages the result. If a mean value in a unit time is a prescribed value or more, the reception is judged finally as a SART signal reception and an alarm display device 3 is operated.</p> |
