In radar, measurement of pulse transmission time in microseconds, that is, the time the radar's transmitter is energized during each cycle
Ballistic Missile Defense, Glossary, Version 3.0, Department of Defense, Ballistic Missile Defense Organization, Defense Pentagon, Washington, DC, USA 1997. https://www.google.com.kw/search?q=Ballistic+Missi le+Defense+Glossary.+Version+3.0%2C+June+1997& rlz=1C1BLWB_enKW586KW586&oq=Ballistic+Missile+ Defense+Glossary.+Version+3.0%2C+June+1997&aqs =chrome..69i57.881j0j4&sourceid=chrome&es_ sm=122&ie=UTF-8, (Ballistic Missile Def - Amer) {1025}