As most of non-coherent radar on active duty has no or little clutter cancellation ability,whenever flying targets enter the area of ground clutter,it is very difficult for radar to observe targets.

• 由于大多数非相参体制雷达没有杂波对消能力或杂波对消能力较差,一旦各类飞行目标进入地杂波区,雷达就难于观测目标。