How does the artillery visually measure the distance?

The artillery visually measured the distance by jumping eyes.

The approximate distance between the measured object and us can be calculated by estimating the width of the field of view seen by the saccade method and combining the similar triangles principle and the straight-line propagation principle of light.

According to this method, the distance between the two pupils is about one tenth of the length of one's own arm, and the distance from the standing point to the target is obtained by multiplying the measured width of the site object by 10. When using saccade, you must be familiar with the dimensions of common objects, such as the length of cars, the height of people and the height of buildings. Otherwise, we can't estimate the distance by saccade.

Extended data:

Limitations of scanning

According to the saccade principle, it can be found that saccade, size (height or width, etc.) should be used. ), so as to estimate the lateral distance (δ L) from the measured object to the position pointed by the thumb.

If it is impossible to judge the size of the measured object (such as a hill with unknown altitude in the distance, etc.). ), then it is impossible to estimate the distance of the measured object from us. In addition, even if the size of the measured object can be estimated, the scanning method has a large error and can only estimate the approximate distance.

Baidu Encyclopedia-Eye Jumping Method