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The air traffic control radar beacon system ( ATCRBS) is a system used in air traffic control (ATC) to enhance surveillance radar monitoring and separation of air traffic. It consists of a rotating ground antenna and transponders in aircraft. The ground antenna sweeps a narrow vertical beam of microwaves around the airspace.
Radar beacon (short: racon) is – according to article 1.103 of the International Telecommunication Union's (ITU) ITU Radio Regulations (RR) [1] – defined as "A transmitter-receiver associated with a fixed navigational mark which, when triggered by a radar, automatically returns a distinctive signal which can appear on the display of the ...
Wireless Emergency Alerts ( WEA, formerly known as the Commercial Mobile Alert System ( CMAS ), and prior to that as the Personal Localized Alerting Network ( PLAN )), [ 1] is an alerting network in the United States designed to disseminate emergency alerts to mobile devices such as cell phones and pagers. Organizations are able to disseminate ...
DEFCON. The defense readiness condition ( DEFCON) is an alert state used by the United States Armed Forces. [ 1][ 2] For security reasons, the US military does not announce a DEFCON level to the public. [ 1] The DEFCON system was developed by the Joint Chiefs of Staff (JCS) and unified and specified combatant commands. [ 3]
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New York City’s mayor issued an emergency order Saturday suspending parts of a new law intended to ban solitary confinement in local jails a day before it was to take effect, citing concerns for ...
The National Warning System (NAWAS) is an automated telephone system used to convey warnings to United States -based federal, state and local governments, as well as the military and civilian population. [1] The original mission of NAWAS was to warn of an imminent enemy attack or an actual accidental missile launch upon the United States.
An inertial navigation system ( INS; also inertial guidance system, inertial instrument) is a navigation device that uses motion sensors ( accelerometers ), rotation sensors ( gyroscopes) and a computer to continuously calculate by dead reckoning the position, the orientation, and the velocity (direction and speed of movement) of a moving ...
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