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Measurement of a target's RCS is performed at a radar reflectivity range or scattering range. [citation needed] The first type of range is an outdoor range where the target is positioned on a specially shaped low RCS pylon some distance down-range from the transmitters. Such a range eliminates the need for placing radar absorbers behind the ...
Glass chart. A 1951 USAF resolution test chart is a microscopic optical resolution test device originally defined by the U.S. Air Force MIL-STD-150A standard of 1951. The design provides numerous small target shapes exhibiting a stepped assortment of precise spatial frequency specimens.
The target strength or acoustic size is a measure of the area of a sonar target. This is usually quantified as a number of decibels . For fish such as salmon , the target size varies with the length of the fish and a 5 cm fish could have a target strength of about -50 dB.
A large target, like the vitals area of a deer, allows a deviation of a few inches (as much as 10 cm) while still ensuring a quickly disabling hit. Vermin such as prairie dogs require a much smaller deviation, less than an inch (about 2 cm). [9] The height of the sights has two effects on point blank range.
In such applications it is useful to use a unit for target size that is a thousandth of the unit for range, for instance by using the metric units millimeters for target size and meters for range. This coincides with the definition of the milliradian where the arc length is defined as 1 / 1,000 of the radius.
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Diagram illustrating the relationship between distance, group size on the target (subtension) and angular group size. Mean point of impact (MPI) is the calculated center of the grouping, which is the average center of all the shots, and is not necessarily located at a hole in the target. [2]
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