ENAVS Part2

Position information should be updated every 4 seconds

Developed in the US and originally conceived to give aircrafts more maneuvering capacity, with the support of available new technologies.

Used for critical messages such as vectoring to avoid traffic and landing clearance at airports with heavy traffic. Serves as back up for data link

Essential for ATN implementation and for greater use of ATS Data links

Designed for ACARS modulation equipment and radio. A low speed bit oriented data transfer system

Improved version of VDL Mode 1

Average data transmission in VDL Mode 2.

Globally dedicated common signaling channel of VDL Mode 2

An integrated digital data and communication systems that makes it possible to use four radio channels on a carrier

A data link technology used by VDL Mode 3.

Stations transmit their geogra[hical position together with data message in time slots that are dynamically modified at frequent intervals.

Basic component of communication between air traffic controller units and aircraft.

Allows air-ground data link whose use is particularly for airspace with traffic of high density.

Excellent stand by system for aeronautical mobile satellite system (AMSS) in oceanic/remote areas

Means of communication between the controller and the pilot that uses data link. Primary means of communication supplemented by HF and Voice satellite links

Piloting an aircraft from place to place without getting lost

Must meet the precision and integrity requirements

Must meet the preciosion and integrity requirements on approval for a give operation of flight phase

Must meet the four navigation system performance requirements

Eye of Air traffic Control

Aircraft automatically transmits, via data links, its identification and 3-D position to the ATC unit

A new aeronautical surveillance concept by virtue of which the aircraft transmits its position through data link

This system operates only in the air-ground mode and at the request of the ATC Unit

The aggregation of airborne functions and ground-based functions required to ensure the safe and efficient movement of aircraft during all phases of operation

Purpose is to maximize use of available airspace within a given airspace structure.

Function is to balance traffic demand and ATC capacity. Ensures efficient use of airport and airspaces in specific area that are prone to “bottlenecks”.

Improved with the implementation of CNS elements

Ground frequency

ALPHA frequency

A permanent trck composed of a line parallel metal rails for transport of passengers and good in trains

The action of generating transmitting signals.

A system used to direct railway traffic and keeps trains clear of each other at all times.

Dissemination of timetable changes.

Trains cannot collide with each other if they are not permitted to occupy the same section of track at the same time so railway lines are divided into blocks

Divided section of railway lines

Trains are permitted to pass signals indication the line ahead is occupied, but only at such speed that they can stop safely driving by sight.

Multiple trains may enter a block with authorization.

Signals indicate whether or not a train may enter a block based on automatic train detection indicating whether a block is clear.

Train is not permitter to enter a block until a signal indicates that the train may proceed.

Computers calculate safe zone around each moving train that no other train is allowed to enter.

A railroad communication system that consists of a series of signals that divide a railway line into a series of sections or blocks. The system controls the movement of trains between block using automatic signals.

Obstructed block

Obstructed block is ahead

Covers train movements only in a single direction of each track

Covers both direction

A low-voltage current is sent through the track between the signals and is detected to determine whether the circuits is closed, open or shorted

A device on a railway that detects the passing of a trains between two points on a track.

A coin-sized device used to make a loud sound warning signal to train drivers

Means the track has gone out of its original position or alignment

Built the possibly the first working steam-powered vehicle

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