The system is reportedly 100 percent silent and extremely difficult to track by air on ground-basedradar systems.
这种系统据称还是完全静音的，地基或空基雷达很难探测到。
2
The pulse Doppler(PD)radar technique in ground-basedradar is mainly applied to detecting motive targets in strong clutter jamming circumstance.
地面雷达中的脉冲多普勒（PD）技术主要用于在强杂波背景下对动目标的检测。
3
In this paper, the concept of calibration for mobile ground-basedradar and the classic method of calibration for the mobile ground-basedradar are described.