由于低层大气的折射效应，俯视雷达的俯角和入射角将随气象条件而变化。
Owing to refractive effect in lower atmospheric, the depression and incident angles of down looking radar vary with weather conditions.
俯视雷达测量地面目标时会受到临界俯角的限制。
A down-looking radar was limited by a critical depression Angle when it detects the target on the ground.
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