word record about IR target detecting and tracking

1 is submerged in background clutter 淹没在背景杂波中

2 performe poorly for the dim small targets in sever clutter.

3 cloud edges 云层边缘 respectively 分别地 各自地 anti-nosie capability 抗噪能力

4 infrared search and track (IRST) system 红外搜索与跟踪系统  IR count measures(IRCM) 红外对抗

5 Immediately after 紧接之后