投影距离是指投影机镜头与屏幕之间的距离，一般用米来作为单位。
当两测点在入射波方向上的投影距离为入射波半波长的倍数时，该方法会出现奇异问题。
When the projecting distances of two gauges on the incident wave direction equal half of the incident wave lengths or time it, there will be a singular problem.
分析了在零侧偏角控制策略的条件下，车辆的质心和转向中心在车身上投影距离的关系式。
Analysised the relationship of the projection distance to the vehicle body of centroid and the steering center of the vehicle under the conditions of the other side of the Angle control strategy.
针对峰值异常和斜凹形异常缺陷分别提出了一个缺陷到射线穿透焊件最薄处的投影距离自动提取算法。
According to the characteristic of abnormal peak and abnormal slant-concave flaw, an automatic extraction algorithm of projection distance was presented individually.
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