tcas的工作原理How does TCAS work.docx

1、tcas的工作原理How does TCAS worktcas的工作原理（How does TCAS work）The working principle of TCAS and the working principle of TCASThe aircraft collision avoidance system, the American airline system is called air traffic warning and collision avoidance system (TCAS:Traffic Alert and Collision Avoidance)System)

2、 the European Aeronautic system is called an Airborne Collision Avoidance System (ACAS:Airborne, Collision, Avoidance)(System) the actual meaning and function of the two are the same. The collision avoidance system can show the situation around the aircraft and provide voice alarms when necessary, w

3、hile helping drivers avoid dangerous situations in an appropriate way, which can help prevent catastrophic accidents.Lets take TCAS as an example.TCASs history can be traced back to 1955, when the Bendix Aviation Electronics (now part of Honey Well Company) Dr. J.S.Morrell published collisions artic

4、le. These include the computer algorithm for determining the speed of approaching aircraft, which is the basis for the study of all collision avoidance systems. In 1960s and 70s, the company developed several prototype machines for the United States Army and the Federal Aviation Administration (FAA)

5、, and acquired the FAAs first identification of the TCAS in the late 80s.TCAS device exteriorPrinciple:In the principle of determining the number, heading and height of the aircraft by the two radar transponder, the interrogation device is mounted on the aircraftThe aircraft can display the distance

6、 between each other so that the driver knows the intervals between the aircraft flying in a certain range and takes timely measures to avoid collisions. Like the two radar, the TCAS system needs to be equipped with transponders on the aircraft.With reference to the two radar, the type of air traffic

7、 control radar can be referencedComposition and function:TCAS consists of interrogator, transponder, transceiver, and computer. Monitoring range is generally 30 nautical miles ahead, 3000 meters above and below, and smaller monitoring in the side and rear. To reduce radio interference, the managemen

8、t regulations limit the power of the TCAS. It limits the forward range of the TCAS to about 45 miles, while the lateral and backward distances are much smallerThe TCAS interrogator sends out a pulse signal called the interrogation signal, similar to the ground launched radar traffic control signal.

9、When the transponder of the other aircraft receives the interrogation signal, the transponder signal is transmitted. The TCAS computer calculates the distance based on the time interval between the transmit signal and the acknowledge signal. At the same time, according to the direction of the antenn

10、a to determine the direction of the driver to provide information and warning, this information is displayed on the drivers navigation information display.TCAS language can provide advice warning, computer can calculate the close monitor region of 30 aircraft within the aircraft and the risk, make t

11、he driver have to take measures to 25-40 seconds. (TCAS tracks 45 aircraft and displays up to 30 planes depending on the priority of the selected target.)The adoption of TCAS has improved flight safety, and TCAS has become the standard equipment in the newly produced large and medium passenger aircr

12、aft.Classification and differentiation of TCAS:TCAS fall into two categories: TCAS, I, and TCASII. The two systems show air traffic patterns similar to those of maps. When other planes approach, two categories of systems can provide air traffic reports (or advice or recommendations) (TA). In TA mode

13、, pre recorded sounds broadcast Traffic, Traffic, while symbols that represent other planes change shapes and colors.TCASII is a more advanced TCAS with additional features called RA. When using the RA method, the TCAS may issue a motor command such as Climb, Climb or Descend, or Descent, or will te

14、ll the driver not to take a maneuver:Air traffic advisory TA will be issued when the nearest point of the other aircraft is less than 48 seconds (Traffic)Advisory). The nearest point is the nearest space between two planes, based on the current track and speed of the aircraft.After the air traffic a

15、dvisory, if two aircraft continue to fly along potentially dangerous tracks, the system will provide processing advice RA (Resolution) about 35 seconds from the nearest pointAdvisory). Symbols representing other planes can become fixed red squares, accompanied by evasive, mobile voice prompts such a

16、s Climb and Climb. The system also displays the required speed with a green bar on the vertical speed indicator. These maneuvers are of little magnitude and generally do not attract the attention of passengers. The TCASII on these two planes will also be coordinated to avoid maneuvering like two aircraft at the same time. Only TCAS, of courseThe II and ACAS II systems have this functionality. There is no RA way in the TCA