Complete the sentences

1. ILS stands for ….

2. The ground equipment of ILS consists of …..

3. The localizer transmitter emits signals which …. 4. International Morse Code consists of …

5. Localizer provides …

6. The function of marker beacons is …

Translate the phrases with participles

System divided into three parts, marker indicating a position, signal provided by glide path facilities, angle adjusted to three degrees, localizer transmitter operating on one of the twenty ILS channels, Code consisting of a three letter identifier

What do they stand for?

ATC, ILS, DME, VOR, GPS, VHF, ADF, IRS

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Text 1

BEACON

The marker beacon is a particular type of low frequency radio beacon used in aviation, usually in conjunction with an instrument landing system (ILS), to give pilots a means to determine position along an established route to a destination such as a runway. From the 1930s until the 1950s, markers were used extensively along airways to provide an indication of an aircraft's specific position along the route, but from the 1960s they have become increasingly limited to ILS approach installations. They are now very gradually being phased out of service, especially in more developed parts of the world, as GPS and other technologies have made marker beacons increasingly obsolete. _____There are three types of marker beacons that may be installed as part of their most common application, an Instrument Landing System:

Outer Marker, which normally identifies the Final Approach Fix, is situated on the same line with the localizer and the runway centerline, four to seven nautical miles before the runway threshold. It is typically located about 1-nautical-mile (2 km) inside the point where the glideslope intercepts the intermediate altitude and transmits a low-powered (3 watt), 400 Hz tone signal on a 75 MHz carrier frequency. Its antenna is highly directional, and is pointed straight up. The valid signal area is a 2,400 ft (730 m) × 4,200 ft (1,280 m) ellipse (as measured 1,000 ft (300 m) above the antenna.) When the aircraft passes over the outer marker antenna, its marker beacon receiver detects the signal. The system gives the pilot a visual (blinking blue outer marker light) and aural (continuous series of audio tone morse code-like 'dashes') indication. Some countries, such as Canada, have abandoned marker beacons completely, replacing the outer marker with a non-directional beacon (NDB), and more recently with GPS fixes. In the United States, the outer marker has often been combined with an NDB to make a Locator Outer Marker (LOM). Some ILS approaches have no navigation aid at all situated at the final approach fix, but use other means, such as VOR radial intersections, distance measuring equipment (DME), GPS, or radar fixes, to identify the position. _____A middle marker works on the same principle as an outer marker. It is normally positioned 0.5 to 0.8 nautical miles (1 km) before the runway threshold. When the aircraft is above the middle marker, the receiver’s amber middle marker light starts blinking, and a repeating pattern of audible morse code-like dot-dashes at a frequency of 1,300 Hz in the headset. This alerts the pilot, that the CAT I missed approach point (typically 200 feet (60 m) above the ground level or AGL on the glideslope) has been passed and should have already initiated the missed approach if one of several visual cues has not been spotted. Similar to the outer and middle markers; located at the beginning (threshold) of the runway on some ILS approach systems (usually Category II and III) having decision heights of less than 200 feet (60 m) AGL. Triggers a flashing white light on the same marker beacon receiver used for the outer and middle markers; also a series of audio tone 'dots' at a frequency of 3,000 Hz in the headset.

Text 2

GPS

The Global Positioning System (GPS) is a U.S. space-based global navigation satellite system. It provides reliable positioning, navigation, and timing services to worldwide users on a continuous basis in all weather, day and night, anywhere on or near the Earth which has an unobstructed view of four or more GPS satellites. _____GPS is made up of three segments: Space, Control and User. The Space Segment is composed of 24 to 32 satellites in Medium Earth Orbit and also includes the boosters required to launch them into orbit. The Control Segment is composed of a Master Control Station, an Alternate Master Control Station, and a host of dedicated and shared Ground Antennas and Monitor Stations. The User Segment is composed of hundreds of thousands of U.S. and allied military users of the secure GPS Precise Positioning Service, and tens of millions of civil, commercial and scientific users of the Standard Positioning Service (see GPS navigation devices). GPS satellites broadcast signals from space that GPS receivers use to provide three-dimensional location (latitude, longitude, and altitude) plus precise time. _____GPS has become a widely used aid to navigation worldwide, and a useful tool for map-making, land surveying, commerce, scientific uses, tracking and surveillance, and hobbies such as geocaching and waymarking. Also, the precise time reference is used in many applications including the scientific study of earthquakes and as a time synchronization source for cellular network protocols. _____GPS has become a mainstay of transportation systems worldwide, providing navigation for aviation, ground, and maritime operations. Disaster relief and emergency services depend upon GPS for location and timing capabilities in their life-saving missions. The accurate timing that GPS provides facilitates everyday activities such as banking, mobile phone operations, and even the control of power grids. Farmers, surveyors, geologists and countless others perform their work more efficiently, safely, economically, and accurately using the free and open GPS signals.