| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To enable to decode the data by properly detecting the direct wave by eliminating the reflection wave even the receiving signal of response signal of SSR mode is composited with the reflection wave by the ground etc. <P>SOLUTION: A differentiator 5 differentiates an A/D converted received power composite pulse signal, a correlation operator 6 operates the amplitude and time at the front edge and the rear edge of each pulse formed receiving power composite pulse signal and outputs, and a reflection level retriever 82 generates the operation parameter for eliminating the reflection and re-compositing the composite wave based on the correlation level and supplying to a reverse operator 81. Therefore, even if the wave form of the receiving signal is changed by the multi paths, the removal of interference of reflection wave or re-composition is attempted by the reverse calculation based on the correlation level of the amplitude and time, an SSR mode S response pulse signal can be properly taken out, consequently detection rate of the target (aeroplane) can be improved. <P>COPYRIGHT: (C)2007,JPO&INPIT</p> |
