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Apr 15, 2008

English Chinese translation sample-Federal Aviation Administration

(Traslated by freelance Chinese translator li – English to Chinese translation or Chinese to English translation services)

Unlike radar, ADS-B accuracy does not seriously degrade with range, atmospheric conditions, or target altitude, and update intervals do not depend on the rotational speed or reliability of mechanical antennas. When a Radar measures the bearing, it is done by the position of the rotating radar antenna when it receives a reply to its interrogation from the aircraft, and it measures the range by the time it takes for the radar to receive the reply. The beam of the antenna gets wider as the aircraft get farther from the antenna, thus making the measured position information less accurate. An ADS-B based system, on the other hand, would listen for position reports broadcast by the aircraft. These position reports are based on accurate navigation systems, such as GPS. The accuracy of the system is not affected by measurement errors, and is unaffected by the range to the aircraft.

With the radar, detecting aircraft velocity changes requires tracking the received data and can only be detected over a period of several position updates. With ADS-B, velocity changes are broadcast almost instantaneously as part of the State Vector report.

ADS-B can decrease the number of active interrogations required by ACAS, thus increasing effective range in high density airspace.

It will also reducing unnecessary alarm rate by incorporating the ADS-B state vector, aircraft intent, and other information.

It extends collision avoidance below 1000 feet above ground level, and detecting runway incursions.

Eventually, the ACAS function may be provided based solely on ADS-B, without requiring active interrogations of other aircraft transponders

These improvements in surveillance accuracy can increase airport and airspace capacity while also improving safety.

ADS-B is also a relatively inexpensive technology. Also, unlike radar, both the footprint and power requirements for ADS-B are quite small, allowing an ADS-B ground station to be installed in even the most remote areas.









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