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Qué (quién) es radar horizon - definición
Radar horizon
DISTANCE AT WHICH THE RADAR BEAM RISES ENOUGH ABOVE THE EARTH'S SURFACE TO MAKE DETECTION OF A TARGET AT LOW LEVEL IMPOSSIBLE
The radar horizon is a critical area of performance for aircraft detection systems that is defined by the distance at which the radar beam rises enough above the Earth's surface to make detection of a target at low level impossible. It is associated with the low elevation region of performance, and its geometry depends on terrain, radar height, and signal processing.
Over-the-horizon radar
![[[Duga radar]] array, near [[Chernobyl]]](https://commons.wikimedia.org/wiki/Special:FilePath/DUGA Radar Array near Chernobyl, Ukraine 2014.jpg?width=200 "[[Duga radar]] array, near [[Chernobyl]]")
![Official coverage of the [[Jindalee Operational Radar Network]]](https://commons.wikimedia.org/wiki/Special:FilePath/JORS.svg?width=200 "Official coverage of the [[Jindalee Operational Radar Network]]")
![antenna]] ''(left)'' reaches a target beyond the horizon by refracting off the [[ionosphere]], and the echo signal from the target ''(right)'' returns to the receiving antenna by the same route.](https://commons.wikimedia.org/wiki/Special:FilePath/OTH-B.big.jpg?width=200 "antenna]] ''(left)'' reaches a target beyond the horizon by refracting off the [[ionosphere]], and the echo signal from the target ''(right)'' returns to the receiving antenna by the same route.")
RADAR SYSTEM THAT CAN FIND TARGETS AT 100S–1000S OF KILOMETRES, BEYOND THE RADAR HORIZON
OTHR; Over-The-Horizon radar; OTH-B; OTH-B Radar; Over the horizon radar; OTH radar; Over-the-horizon; Skywave radar; OTH-SW; ROTHR; Relocatable Over-the-Horizon Radar; Tactical Multi-Mission Over the Horizon Radar
Over-the-horizon radar (OTH), sometimes called beyond the horizon (BTH), is a type of radar system with the ability to detect targets at very long ranges, typically hundreds to thousands of kilometres, beyond the radar horizon, which is the distance limit for ordinary radar. Several OTH radar systems were deployed starting in the 1950s and 1960s as part of early warning radar systems, but these have generally been replaced by airborne early warning systems.
Particle horizon
THE MAXIMUM DISTANCE FROM WHICH LIGHT FROM PARTICLES COULD HAVE TRAVELED TO THE OBSERVER DURING THE AGE OF THE UNIVERSE
Cosmic light horizon; Conformal time; Cosmic horizon
The particle horizon (also called the cosmological horizon, the comoving horizon (in Dodelson's text), or the cosmic light horizon) is the maximum distance from which light from particles could have traveled to the observer in the age of the universe. Much like the concept of a terrestrial horizon, it represents the boundary between the observable and the unobservable regions of the universe, so its distance at the present epoch defines the size of the observable universe.
Ejemplos de uso de radar horizon
1. "Those planes alone extend our radar horizon to a huge circle of the sky.