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AIRPORTS AUTHORITY OF INDIA
The Airports Authority of India(AAI) under the Ministry of
Civil Aviation is responsible for creating, upgrading, maintaining and
managing civil aviation infrastructure in India. It providesAir traffic
management (ATM) services over Indianairspace and adjoining
oceanic areas. It also manages a total of 125 Airports, including 11
International Airports, 8Customs Airports,81 Domestic Airports and25civil enclaves at Military Airfields. AAI also has ground
installations at all airports and 25 other locations to ensure safety of
aircraft operations. AAI covers all major air-routes over Indian
landmass via 29Radar installations at 11 locations along with 89
VOR/DVOR installations co-located withDistance Measuring
Equipment (DME). 52 runways are provided withInstrument landing
system (ILS) installations with Night Landing Facilities at most ofthese airports and Automatic Message Switching System at 15
Airports.
AAI has four training establishments viz. The Civil Aviation Training
College (CATC) atAllahabad , National Institute of Aviation
Management and Research (NIAMAR) at Delhi and Fire TrainingCentres (FTC) at Delhi & Kolkata. An Aerodrome Visual Simulator
(AVS) has been provided at CATC and non-radar procedural ATC
simulator equipment is being supplied to CATC Allahabad and
Hyderabad Airport.
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Functions
Design, Development, Operation and Maintenance of international
and domestic airports and civil enclaves.
Control and Management of the Indian airspace extending beyond
the territorial limits of the country, as accepted by ICAO. Construction, Modification and Management of passenger
terminals.
Development and Management of cargo terminals at international
and domestic airports.
Provision of passenger facilities and information system at the
passenger terminals at airports.
Expansion and strengthening of operation area, viz. Runways,
Aprons, Taxiway etc. Provision of visual aids.
Provision of Communication and Navigation aids, viz. ILS,
DVOR, DME, Radar, etc.
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AIR TRAFFIC CONTROL
Air traffic control(ATC) is a service provided by ground-
basedcontrollers who directaircraft on the ground and through
controlledairspace,and can provide advisory services to aircraft in
non-controlled airspace. The primary purpose of ATC worldwide is to
prevent collisions, organize and expedite the flow of traffic, and
provide information and other support forpilots.[1]In some countries,
ATC plays a security or defensive role, or is operated by the military.
To prevent collisions, ATC enforcestraffic separation rules, which
ensure each aircraft maintains a minimum amount of empty space
around it at all times. Many aircraft also havecollision avoidance
systems,which provide additional safety by warning pilots when
other aircraft get too close.
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FUNCTIONS AND RESPONSIBILITIES OF ATC
Air Traffic Services Air traffic Control Services Flight Information Services Alerting Services
Aeronautical Information Services Search and Rescue Airspace Management Surveillance over VIP areas Billing NOC
WORKING OF ATC UNITS
OBJECTIVES:
Prevent collision between aircraft.
Prevent collision between aircraft on the maneuvering areaand obstructions on that area.
Expedite and maintain an orderly flow of air traffic.
Provide advice and information useful for the safe andefficient conduct of flights.
Notify appropriate organisations regarding aircraft in needof search and rescue aid, and assist such organisations asrequired.
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VARIOUS ATS UNITS
SMC (SURFACE MOVEMENT CONTROL): Controlsmovement of Aircraft (Startup & Taxi clearance), vehicles and
persons on ground.
ADC (AERODROME CONTROL TOWER): Controlsmovement of Aircraft (Landing & Take off) and vehicles on
Runway.
APP/TAR (APPROACH CONTROL):Controls Aircraft duringclimb and descend of arriving/departing aircraft within 60 miles of
an airport.
ACC/RSR (ROUTE SURVEILLENCE RADAR):ControlsAircraft during climb and descend and level flight of
arriving/departing/over-flying aircraft beyond 60 miles of an airport.
FIC FLIGHT INFORMATION CENTER:Maintains flight plansof all active and inactive flights; helps in search and rescue of flights
in distress
ARO ATS REPORTING OFFICE:Scrutinizes and accept flightplans; Provides/receives all operational briefing to/from the pilots.
Also coordinates with Airline operators/ Military liaison units.
WSO (WATCH SUPERVISORY OFFICER):Operational as wellas administrative in-charge on round the clock basis.
TRAINING CELL: Provides training for independent control inreal as well as in simulated environments (using SIMULATOR) for
working in different ATS units.
RNFC (ROUTE NAVIGATION FACILITY CHARGES):Raisesbills for navigation/landing/Passenger Service Fee. SEARCH AND RESCUE UNIT:Maintains a record of all
documents / Charts / Important Telephone numbers for the purpose
of Search & Rescue.
AIS (AERONAUTICAL INFORMATION SERVICES):Collection, collation, compilation and dissemination of information
that is of operational importance for ATC units.
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CONTROLLING UNITS FOR ARRIVING
AIRCRAFT
---------------------FIR BOUNDARY------------------
Flight Information Center
Area Control Center
Approach Control
Aerodrome Control Tower
Surface Movement Control
-------APRON CONTROL AIRCRAFT ON GROUND-------
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CONTROLLING UNITS FOR DEPARTING
AIRCRAFT
---------------------FIR BOUNDARY------------------
Flight Information Center
Area Control Center
Approach Control
Aerodrome Control Tower
Surface Movement Control
ATS Reporting Office
-------APRON CONTROL AIRCRAFT ON GROUND-------
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ATC TOOLS
FOR SURVEILLENCE
Visual Surveillance In/From Control Tower
RADAR (Primary & Secondary) Based Surveillance
ADS (Automatic Dependent Surveillance)
FOR MAINTAINING FLIGHT PROFILES
Flight Progress Strips (Manual)
Automated ATCS At Delhi/Mumbai
FOR COMMUNICATION
Direct & Indirect Two Way Communication With Pilot
FOR COORDINATION (INTER-UNIT & INTRA-UNIT)
Telephones / DSC / AFTN
FOR SEARCH AND RESCUE
Location BEACONS/ SATELLITES / SPECIALAGENCIES (INMCC)
EXPERIENCE
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EQUIPMENTS USED
Surveillance:
Plotting On The Basis Of Position Reports
RADAR/ ADS Based Surveillance
Communication:
VHF / HF / AFTN / AMSS / ASBS / Telephones
Navigation:
VOR / NDB / DME / FANS [RNP / SATELLITES / GPS /GLONASS / LORAN - C / OMEGA]
Landing Aids:
ILS / MLS ( microwave landing system )
Automated Systems:
FDPS / RDPS / FDD / SDD / ASDE / ADS / CPDLC /ADS-B / MODE - S
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COMMUNICATION
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SEPARATION MINIMA
HORIZONTAL
Lateral
Longitudinal (Time based & Distancebased)
Geographical
VERTICAL
1000 feet
2000 feet
RADAR SEPARATION
5 NM
10 NM
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CURRENT CNS/ATM SYSTEM
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NAVIGATION AIDS
The process or activity of accurately ascertaining one's position and
planning and following a route is known as navigation. The equipments
and systems which together help in navigation are known as Navigation
Aids (also known as aid to navigation, ATON, or navaid).
Navigational Aids consist of the following:
1.INSTRUMENT LANDING SYSTEM
An instrument landing system (ILS) is a ground-based instrument
approach system that provides precision guidance to an aircraft
approaching and landing on a runway,using a combination of radio
signals and, in many cases, high-intensity lighting arrays to enable a
safe landing duringinstrument meteorological conditions (IMC),such
as lowceilings or reduced visibility due to fog, rain, or blowing snow.
Radio-navigation aids must provide a certain accuracy (set by
international standards of CAST/ICAO); to ensure this is the case,
flight inspection organizations periodically check critical parameters
with properly equipped aircraft to calibrate and certify ILS precision.
An aircraft approaching a runway is guided by the ILS receivers in the
aircraft by performing modulation depth comparisons. Many aircraftcan route signals into theautopilot to fly the approach automatically.
An ILS consists of two independent sub-systems. The localizer
provides lateral guidance; the glide slope provides vertical guidance.
(i) LOCALIZER
A localizer is an antenna array normally located beyond the
departure end of the runway and generally consists of several pairs
of directional antennas. Two signals are transmitted on one of 40 ILS
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channels. One ismodulated at 90 Hz, the other at 150 Hz. These are
transmitted from co-located antennas. Each antenna transmits a
narrow beam, one slightly to the left of the runway centerline, the
other slightly to the right.The localizer receiver on the aircraft measures the difference in the
depth of modulation (DDM) of the 90 Hz and 150 Hz signals. The
depth of modulation for each of the modulating frequencies is 20
percent. The difference between the two signals varies depending on
the deviation of the approaching aircraft from the centerline.
If there is a predominance of either 90 Hz or 150 Hz modulation, the
aircraft is off the centerline. In the cockpit, the needle on the
instrument part of the ILS (the omni-bearing indicator (nav
indicator), horizontal situation indicator (HSI), or course deviation
indicator (CDI)) shows that the aircraft needs to fly left or right to
correct the error to fly toward the center of the runway. If the DDM
is zero, the aircraft is on the LOC centerline coinciding with the
physical runway centerline. The pilot controls the aircraft so that the
indicator remains centered on the display (i.e., it provides lateral
guidance).
(ii) Glide slope (GS) or glide path (GP)
A glide-slope station is an antenna array sited to one side of the
runway touchdown zone. The GS signal is transmitted on a carrier
frequency using a technique similar to that for the localizer. The
center of the glide-slope signal is arranged to define a glide path ofapproximately 3 above horizontal (ground level). The beam is 1.4
deep (0.7 below the glide-path center and 0.7 above).
The pilot controls the aircraft so that the glide-slope indicator
remains centered on the display to ensure the aircraft is following
the glide path to remain above obstructions and reach the runway at
the proper touchdown point (i.e., it provides vertical guidance).
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Carrier frequency pairings for localizer and glide slope
LOC and GS carrier frequencies are paired so that the navigationradio automatically tunes the GS frequency which corresponds to the
selected LOC frequency.[2]
LOCcarrier frequencies range between 108.10 MHz and 111.95 MHz
(with the 100 kHz first decimal digit always odd, so 108.10, 108.15,
108.30, etc., are LOC frequencies and are not used for any other
purpose).
Limitations
Due to the complexity of ILS localizer and glide-slope systems, there
are some limitations. Localizer systems are sensitive to obstructions
in the signal broadcast area like large buildings or hangars. Glide
slope systems are also limited by the terrain in front of the glide
slope antennas. If terrain is sloping or uneven, reflections can createan uneven glidepath causing unwanted needle deflections.
Additionally, since the ILS signals are pointed in one direction by the
positioning of the arrays, glide slope supports only straight-line
approaches with a constant angle of descent. Installation of an ILS
can be costly because of siting criteria and the complexity of the
antenna system.
ILS critical areas and ILS sensitive areas are established to avoidhazardous reflections that would affect the radiated signal. The
location of these critical areas can prevent aircraft from using certain
taxiways[3] leading to delays in takeoffs, increased hold times, and
increasedseparation between aircraft.
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Identification
In addition to the previously mentioned navigational signals, thelocalizer provides for ILS facility identification by periodically
transmitting a 1,020 HzMorse code identification signal. This lets
users know the facility is operating normally and that they are tuned
to the correct ILS. The glide-slope station transmits no identification
signal, so ILS equipment relies on the localizer for identification
Monitoring
It is essential that any failure of the ILS to provide safe guidance be
detected immediately by the pilot. To achieve this, monitors
continually assess the vital characteristics of the transmissions. If any
significant deviation beyond strict limits is detected, either the ILS is
automatically switched off or the navigation and identification
components are removed from the carrier.[6]Either of these actions
will activate an indication ('failure flag') on the instruments of an
aircraft using the ILS.
(iii) MARKER BEACONS
On some installations, marker beacons operating at a carrier
frequency of 75 MHz are provided. When the transmission from a
marker beacon is received it activates an indicator on the pilot's
instrument panel and the tone of the beacon is audible to the pilot.The distance from the runway at which this indication should be
received is published in the documentation for that approach,
together with the height at which the aircraft should be if correctly
established on the ILS. This provides a check on the correct function
of the glide slope. In modern ILS installations, a DME is installed, co-
located with the ILS, to augment or replace marker beacons. A DME
continuously displays the aircraft's distance to the runway.
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Outer marker ( 3.9 NM from touchdown ) ( colour: blue )
Middle Marker ( 0.94 NM or 1750 m from touchdown ) ( colour:
amber )
Inner Marker ( 0.54 NM or 1000 m from touchdown ) ( colour: white)
(iv) DME
Distance measuring equipment (DME) provides pilots with a slant
range measurement of distance to the runway in nautical miles.
DMEs are augmenting or replacing markers in many installations. The
DME provides more accurate and continuous monitoring of correct
progress on the ILS glide slope to the pilot, and does not require an
installation outside the airport boundary. When used in conjunction
with an ILS, the DME is often sited midway between the reciprocal
runway thresholds with the internal delay modified so that one unit
can provide distance information to either runway threshold. For
approaches where a DME is specified in lieu of marker beacons, DME
Required is noted on the Instrument Approach Procedure and the
aircraft must have at least one operating DME unit to begin the
approach.
The DME system is composed of a UHF transmitter/receiver
(interrogator) in the aircraft and a UHF receiver/transmitter
(transponder)on the ground
Aircraft use DME to determine their distance from a land-based
transponder by sending and receiving pulse pairs two pulses of
fixed duration and separation. The ground stations are typically co-
located withVORs.A typical DME ground transponder system for en-
route or terminal navigation will have a 1 kW peak pulse output on
the assigned UHF channel.
A low-power DME can also be co-located with an ILS glide slope
antenna installation where it provides an accurate distance to
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touchdown function, similar to that otherwise provided by ILS
Marker Beacons.
DME facilities identify themselves with a 1350 Hz Morse code three
letter identity. If collocated with a VOR or ILS, it will have the sameidentity code as the parent facility. Additionally, the DME will identify
itself between those of the parent facility. The DME identity is
1350 Hz to differentiate itself from the 1020 Hz tone of the VOR or
the ILS localizer.
A radio signal takes approximately 12.36 microseconds to travel 1
nautical mile (1,852 m) to the target and backalso referred to as a
radar-mile. The time difference between interrogation and reply,
minus the 50 microsecond ground transponder delay, is measured by
the interrogator's timing circuitry and converted to a distance
measurement (slant range), in nautical miles, then displayed on the
cockpit DME display.
The distance formula, distance = rate * time, is used by the DMEreceiver to calculate its distance from the DME ground station. The
rate in the calculation is the velocity of the radio pulse, which is the
speed of light (roughly 300,000,000m/s or 186,000 mi/s). The time
in the calculation is (total time 50s)/2.
It is placed with GP in I.G.I. airport and it is used to calculate distance
from touch down point.
The range of DME placed in I.G.I. airport is 200 nautical miles
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2.VOR- VHF Omnidirectional Radio Range
VOR is an abbreviation for "VHF Omnidirectional Radio Range",which implies that it operates in the VHF band. Adopted by ICAO as
early as 1960, VOR has been the main short-range navigational aid
for several years. Short range infers that ranges up to 200 NM. It
enables aircrafts to determine their position and stay on course by
receiving radio signals transmitted by a network of fixed ground radio
beacons, with a receiver unit. It uses radio frequencies in the very
high frequency(VHF) band from 108 to 117.95 MHz. Developed inthe US beginning in 1937 and deployed by 1946, VOR is the standard
air navigational system in the world, used by both commercial and
general aviation. As opposed to the NDB, which transmits a non-
directional signal, the signal transmitted by the VOR contains
directional information.
They are of 2 types: DVOR and CVOR
(a) Conventional VOR
A conventional VOR (CVOR) has three Amplitude Modulated
(AM) signals encoded on a VHF carrier:
1) a 30 Hz variable (VAR), which is modulated by the antenna,
not the transmitter;
2) a 9960 Hz subcarrier, which is in turn frequency modulated
(FM) with a 30 Hz reference (REF) signal;3) and a voice / identifier channel, which includes 1020 Hz
"Morse code" identifiers and aural voice signals.
(b) Doppler VOR
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VOR Applications
Homing & tracking to a VOR.
Tracking from a VOR.
Position fixes. If two VORs are in range then the bearing from each
can be ascertained, roughly plotted on the chart [after converting to
true bearings] and the aircraft position will be close to the
intersection point of the LOPs. Alternatively a VOR bearing and a NDB
bearing can be used or a VOR bearing and a line feature on the chart,
the latter technique being the most frequently used. Running fix / distance from VOR. (DVOR provides an angle ranging
from 0-60 degrees)
3.Non Directional Beacon
A non-directional (radio) beacon (NDB) is a radio transmitter at a
known location, used as an aviation or marine navigational aid. As
the name implies, the signal transmitted does not include inherent
directional information, in contrast to other navigational aids such as
low frequency radio range, VHF omnidirectional range (VOR). NDB
signals follow the curvature of the Earth, so they can be received at
much greater distances at lower altitudes, a major advantage over
VOR. However, NDB signals are also affected more by atmospheric
conditions, mountainous terrain, coastal refraction and electrical
storms, particularly at long range.
Range higher than Beacon around 1000 nautical miles.
NDBs typically operate in the frequency range from 190 kHz to
535 kHz (although they are allocated frequencies from 190 to
1750 kHz) and transmit a carriermodulated by either 400 or 1020 Hz.
NDBs can also be colocated with DME in a similar installation for the
ILS as the outer marker, only in this case, they function as the inner
marker. NDB owners are mostly governmental agencies and airport
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authorities. NDBs are most commonly used as markers or "locators"
for an instrument landing system (ILS) approach or standard
approach
.NDB navigation consists of two parts
the automatic direction finder (or ADF) equipment on the
aircraft that detects an NDB's signal, The ADF can also locate
transmitters in the standard AM medium wave broadcast band
the NDB transmitter
Relative Bearing
The angle between NDB and nose of the aircraft in clockwisedirection is called relative bearing.
ADF equipment determines the direction to the NDB station relative
to the aircraft. This may be displayed on a relative bearing indicator
(RBI).
NDB Errors:
Thunderstorms emit electrical energy in the NDB band and will
deflect the ADF needle towards the storm.
Electrical interference.
Attitude effects. The indicated bearing will not be accurate
whilst the aircraft is banked.
Terrain and coastal effects. In mountainous areas NDB signals
may be reflected by the terrain which can cause the bearing
indications to fluctuate. Ground waves are refracted when
passing across coast lines at low angles and this will affect the
indicated bearing for an aircraft tracking to seaward and
following the shore line.
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Main Applications
Enroute: helps in finding the correct route
Holding: if the runway is not free currently then the aircraft can
be instructed to hold to a particular distance and keep circling
with the distance as the radius
Homing: it points to the position to reach to(destination).
VHF - VERY HIGH FREQUENCY
VHF FREQUENCY RANGE - (117.975 - 136.975) MHz
USERS - ATCO (Air Traffic Controllers), Airlines/Defense Pilots.
Very high frequency (VHF)is theITU-designated range[1] ofradio
frequencyelectromagnetic waves from 30MHz to 300MHz,with
corresponding wavelengths of one to ten meters.
Common uses for VHF areFM
radio broadcasting,television broadcasting, land mobile stations
(emergency, business, private use and military), long range data
communication up to several tens of kilometres withradiomodems,amateur radio, andmarine communications.Air traffic
control communications and air navigation systems
(e.g.VOR,DME &ILS) work up to a distance of 200 nautical miles
VHFpropagation characteristics are ideal for short-distance
terrestrial communication, with a range generally somewhat farther
thanline-of-sight from the transmitter. Unlike high frequencies (HF),
theionosphere does not usually reflect VHF waves
(calledskywave propagation) so transmissions are restricted to the
http://en.wikipedia.org/wiki/International_Telecommunications_Unionhttp://en.wikipedia.org/wiki/Very_high_frequency#cite_note-ITU_Nomenclature-1http://en.wikipedia.org/wiki/Radio_frequencyhttp://en.wikipedia.org/wiki/Radio_frequencyhttp://en.wikipedia.org/wiki/Electromagnetic_wavehttp://en.wikipedia.org/wiki/Megahertzhttp://en.wikipedia.org/wiki/Megahertzhttp://en.wikipedia.org/wiki/FM_radiohttp://en.wikipedia.org/wiki/FM_radiohttp://en.wikipedia.org/wiki/Televisionhttp://en.wikipedia.org/wiki/Radio_modemhttp://en.wikipedia.org/wiki/Radio_modemhttp://en.wikipedia.org/wiki/Amateur_radiohttp://en.wikipedia.org/wiki/Marine_VHF_radiohttp://en.wikipedia.org/wiki/Air_traffic_controlhttp://en.wikipedia.org/wiki/Air_traffic_controlhttp://en.wikipedia.org/wiki/VHF_omnidirectional_rangehttp://en.wikipedia.org/wiki/Distance_measuring_equipmenthttp://en.wikipedia.org/wiki/Instrument_landing_systemhttp://en.wikipedia.org/wiki/Radio_propagationhttp://en.wikipedia.org/wiki/Line-of-sight_propagationhttp://en.wikipedia.org/wiki/Ionospherehttp://en.wikipedia.org/wiki/Skywavehttp://en.wikipedia.org/wiki/Skywavehttp://en.wikipedia.org/wiki/Ionospherehttp://en.wikipedia.org/wiki/Line-of-sight_propagationhttp://en.wikipedia.org/wiki/Radio_propagationhttp://en.wikipedia.org/wiki/Instrument_landing_systemhttp://en.wikipedia.org/wiki/Distance_measuring_equipmenthttp://en.wikipedia.org/wiki/VHF_omnidirectional_rangehttp://en.wikipedia.org/wiki/Air_traffic_controlhttp://en.wikipedia.org/wiki/Air_traffic_controlhttp://en.wikipedia.org/wiki/Marine_VHF_radiohttp://en.wikipedia.org/wiki/Amateur_radiohttp://en.wikipedia.org/wiki/Radio_modemhttp://en.wikipedia.org/wiki/Radio_modemhttp://en.wikipedia.org/wiki/Televisionhttp://en.wikipedia.org/wiki/FM_radiohttp://en.wikipedia.org/wiki/FM_radiohttp://en.wikipedia.org/wiki/Megahertzhttp://en.wikipedia.org/wiki/Megahertzhttp://en.wikipedia.org/wiki/Electromagnetic_wavehttp://en.wikipedia.org/wiki/Radio_frequencyhttp://en.wikipedia.org/wiki/Radio_frequencyhttp://en.wikipedia.org/wiki/Very_high_frequency#cite_note-ITU_Nomenclature-1http://en.wikipedia.org/wiki/International_Telecommunications_Union -
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localradio horizon less than 100 miles. VHF is also less affected by
atmospheric noise and interference from electrical equipment than
lower frequencies. While it is blocked by land features such as hills
and mountains, it is less affected by buildings and can be received
indoors, although multipath television reception due to reflection
from buildings can be a problem in urban areas.
ANTENNAS
VHF is the first band at which wavelengths are small enough to make
efficient transmitting antennas for handheld devices, so the VHF and
UHF wavelengths are used for handheldtransceivers andwalkie
talkies.Fixed station antennas are usually based on thedipole,whileportable radios usually usewhips orrubber ducky antennas.TheYagi
antenna is the most widely used as a high gain or "beam" antenna.
VHF Range assigned to AAI: 108 MHz156 MHz
The VHF unit of Airports Authority of India provides for the following
functions-
o Maintain all VHF channels
o Providing radio communication between ATCO andAircraft.
o Additional standalone system is provided through J -Controller and Transceivers at different ATC positions.
o Serviceability of Mains and Standby equipments.o All preventive and corrective maintenance schedules are
performed.
o The air-to-ground communications are also recorded.Analysis of recorded communication is done by DGCA,AAI, ATC personnel for the purpose of investigation incase of accident/incidence.
o VHF is also used to give weather information to ATC andpilots.
VHF transmission uses Amplitude modulation because this type ofmodulation has a greater coverage range and requires less
bandwidth as compared to Frequency or Phase modulation.
http://en.wikipedia.org/wiki/Radio_horizonhttp://en.wikipedia.org/wiki/Transceiverhttp://en.wikipedia.org/wiki/Walkie_talkiehttp://en.wikipedia.org/wiki/Walkie_talkiehttp://en.wikipedia.org/wiki/Dipole_antennahttp://en.wikipedia.org/wiki/Whip_antennahttp://en.wikipedia.org/wiki/Rubber_ducky_antennahttp://en.wikipedia.org/wiki/Yagi-Uda_antennahttp://en.wikipedia.org/wiki/Yagi-Uda_antennahttp://en.wikipedia.org/wiki/Yagi-Uda_antennahttp://en.wikipedia.org/wiki/Yagi-Uda_antennahttp://en.wikipedia.org/wiki/Rubber_ducky_antennahttp://en.wikipedia.org/wiki/Whip_antennahttp://en.wikipedia.org/wiki/Dipole_antennahttp://en.wikipedia.org/wiki/Walkie_talkiehttp://en.wikipedia.org/wiki/Walkie_talkiehttp://en.wikipedia.org/wiki/Transceiverhttp://en.wikipedia.org/wiki/Radio_horizon -
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SADARJUNG AIRPORT
Safdarjung Airport is a Visual Flight Region ( VFR )
EQUIPMENTS STUDIED AT SAFDARUNG AIRPORT:
1. VHF - Frequency: 122.3 MHz
Tx : ECIL 5350, T6T
Rx : OTE DR100, T6R
Jcont : ECIL , AK100
Txr : iCOM 1CA110
VHF antenna : Folded dipole antenna ( bidirectional )
2. DVR - Digital Voice Recorder( 8 channel ) ( Marathon, Ricochet, RETIA )
3. XBIS (X-Ray Baggage Investigation System ) : carry out both organic and
inorganic scanning.
4. ETD ( Explosive Trace Detector )
5. DFMD ( Door Frame Metal Detector )
6. HHMD ( Hand Held Metal Detector )
7. NDB202 kHz
8. HF - 6706 kHz Tx : ZENITAL ( 5kW )
11467 kHz Txr : 2010 CODAN
9. Walkie Talkie : ( Company : Motorola, Kenwood )
It works in the UHF range. It has 12 channels and a range of about 2 kms. It
facilitates coordination Delhi police, airport police and AAI officials.
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Automation System
Automationis the use of machines, control systems andinformation technologies to optimize productivity in the production
of goods and delivery of services. The correct incentive for applying
automation is to increase productivity, and/or quality beyond that
possible with current human labour levels so as to realize economies
of scale, and/or realize predictable quality levels.
OBJECTIVES:
PRIMARY OBJECTIVES:
The primary objectives of automation system are as follows:
1) Efficiency enhancement of ATC officers:
Automation system enhances the efficiency of the air traffic
controllers.
2) Accuracy of overall ATC:
Automation system also takes care of the accuracy of the air traffic
controllers as well as that of the pilot.
3) Safety of passengers and aircraft:
Efficiency and accuracy of air traffic controllers directly/indirectly
leads to safety of the passengers as well as the aircraft.
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Functions of the System:
Primary mission: is to enhance to the safety of air travel through the
timely acquisition and presentation of flight related data for use by
air traffic controller and support staff.
Secondary mission: is to support training of air traffic controllers andsupport staff. The system also supports the evaluation of revised
operational environments and the testing/evaluation of new system
functionality.
BACKGROUND AND JUSTIFICATION
1.Lapses in human performance underlie most safety
breakdowns and damage-inducing events in modern,
technology-based production systems, of which air
transportation is a perfect example.
2.From the perspective of Human Factors, three reasons explain
the apparent stagnation of safety levels. The first reason can be
found in what has been called an escalation of commitment:
since the Second World War, safety in civil aviation has been
pursued through the introduction of new technology,
supported by the training necessary to employ it in operational
settings and the relevant regulations regarding both. In every
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instance where accident investigations identified "new" safety
breakdowns and/or hazards, more technology, more training
and more regulations were introduced. When "newer" safety
breakdowns/hazards were further identified, more technology,further training and regulations were introduced. And so
continued the escalation of commitment of international civil
aviation with respect to technology, training and regulation.
3.Secondly, technological solutions have on occasion been
designed without full consideration of how they would properly
interface with existing operational environments. In this regard,
the absence of a systemic approach to the integrated
implementation of technological and Human Factors solutions
has been conspicuous. Technology and Human Factors have
followed independent avenues, and little dialogue has existed
among technology designers and Human Factors practitioners.The industry has thus witnessed the emergence of fine
technology which failed to deliver its promised potential
because of serious flaws in its interface either with the human
operator, with the demands of operational context, or with
both.
4.This approach, known as "technology-centred automation", is
being gradually phased-out in favor of a "human-centred
automation", where technology is considered but a tool to
assist humans in their monitoring and performing tasks.
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AUTOMATION SYSTEM OVERVIEW
The Automation System is comprised of the following functional subsystems.
a) Radar Data Processing System (RDPS) receives and processes
radar data information from various radar sites.
b) Flight Data Processing System (FDPS)
processes informationassociated with flight plan data based on information received from internal or
external sources and makes it accessible by the various Air Traffic Control (ATC)
working positions including the Flight Data Display (FDD).
c) Communications Gateway Processor / Aeronautical Information
System (CGP/AIS) subsystem which provides the interface to the
Controller Pilot Data Link Communications aswell as AFTN.
d) Data Recording Facility (DRF)
provides capability to record andreplay ATC data from all subsystems on the local area network (LAN) including
operator actions at each controller working position.
e) Data Management System (DMS) provides capability to perform
adaptation changes and downloads of new software releases.
f) Supervisor Working Position Consists of a Situation Data Display
(SDD) and Control and Monitoring Display / Flight Data Display / Aeronautical
Information Display (CMD/FDD/AID). It provides a centralized point of controlfor all the system management related actions and maintenance operations.
SDD displays track and flight data received from Radar Data Processing System
(RDPS). CMD provides an integrated capability for control and monitoring of
the automation components and radar interfaces.
g) Controller Working Position Consists of an SDD and either an
FDD/AID or an FDD/AID/DLD and an FDD/DLD. Together these positions are
used to control aircraft that enter its assigned area of jurisdiction and monitors
aircraft flight plan progress.
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h) Voice Processing Facility (VPF) This is an optional component. The
VPF digitizes analog audio from the Voice Communication Control System
(VCCS). This audio is typically ATC radio or telephone communications sent
through a main distribution frame (MDF) to the VPF and then recorded by theDRF.
Critical subsystem components such as RDPS, FDPS, and DRF, are redundant to
ensure continuous operation in the event of a component failure or
maintenance action. All the subsystems are interconnected via dual 100BaseT
Ethernet LAN. A third LAN provides Direct Radar Access (DRA)
TOPOLOGY
Physically : Star Topology
Logically : Bus topology
Software Overview
Functions are controlled and executed by computer software
application programs that reside in the Automation System
computers. The Sun Solaris Operating System (OS) runs the
application programs and acts as an interface between the controller
and application. The OS manages computer resources in a non-
interfering manner, executing stored applications and controlling
information transfers between processors and external devices and
interfaces via the LAN. The application software is organized by
function into Computer Software Configuration Items (CSCls). The
application software references site-specific adaptation data.
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TYPES OF EQUIPMENTS IN THE UNIT
Subsystem Type Subsystem Description Main H/W Configuration
RDPS Radar data processing system SUN FIRE-210
FDPS Flight data processing system SUN FIRE-210
DRF Data recording facility SUN FIRE-210
ATG Air traffic generator
(ATC simulator system)
SUN FIRE-210
SDD Situation display workstation SUN BLADE-2500
FDD Flight data display workstation SUN BLADE-1500
CMD Control and Monitoring display
workstation
SUN BLADE-1500
AIS Aeronautical information system SUN BLADE-1500
DRA Direct radar access SUN FIRE-210
DMS Database Management system SUN BLADE-1500
Dual LAN
Network
Connecting all the subsystems CAT-5 e
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