Window

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Window

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1. Any device introduced into the atmosphere for producing an appreciable radar echo, usually for tracking some airborne device or as a tracer of wind. </dd>
2. A World War II code name for a type of radar-jamming device employed to confuse the operators of enemy radars (also referred to by the code names of rope, chaff , and clutter ). </dd>
One type of window consists of packages containing thousands of small strips of paperbacked tinfoil which may be dropped from aircraft and balloons, ejected from rockets, and carried within balloons. The packages burst open upon ejection, scattering the tinfoil widely, producing a radar echo which looks like a small shower or a tight formation of aircraft on plan-position-indicator scopes. </dd>
3. Any gap in a linear continuum, as atmospheric 'windows , ranges of wavelengths in the electromagnetic spectrum to which the atmosphere is transparent, or firing windows , intervals of time during which conditions are favorable for launching a spacecraft on a specific mission. [[/a>|/a> ]]

References

This article is based on NASA's Dictionary of Technical Terms for Aerospace Use