| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a means for eliminating a pseudo target according to the multipath phenomenon. SOLUTION: Since the electronic wave propagation path of the reflection wave of an aircraft response due to multipath is longer than that of a true direct wave, the reception time is delayed. Also, since the reception power level of the reflection wave of the aircraft response due to the multipath is attenuated as compared with the reception power level of the true direct wave, the time stamp of the reception time is made by the target detection part of an aircraft according to time from a reference time generation part 7, and comparison is made with the time stamp time with an aircraft having the same identification information of the response signal from the aircraft as a target by a multipath suppression part 9, thus suppressing the target data with slower reception time. Also, the reception level of a reception signal is measured, and the reception level of a response signal from the aircraft is compared with an aircraft having the same identification information of the response signal from the aircraft as a target by the multipath suppression part 9, thus suppressing the target data with a low reception level.</p> |
