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LONG RANGELONG RANGE
NAVIGATIONNAVIGATION
Presentors:
Ms. Marde Joy A. Mercado
Mr. Joel Anthony Baylon
Ms. Gladen Joy Arcayera
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Long Range NavigationLong Range Navigation
((LoRaNLoRaN))
LORAN (LOng RAnge
Navigation) is a terrestrial radionavigation system using lowfrequency radio transmitters in
multiple deployment todetermine the location and
speed of the receiver.
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HistoryHistory
The earliest LORAN systems were
developed in Britain prior to the
Second World War, and thetechnology was refined at theMassachusetts Institute of
Technology in the 1940s byresearchers for the American
military.
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Initial LORAN systems had a range of
1,200 miles (1,930 km)
It originally was known as "LRN" for
Loomis Radio Navigation
Over time, the range and applicationsof LORAN were expanded, with LORAN-C, which operates in the 90-110 kilohertzrange, becoming the system in mostwidespread use.
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Principle of OperationPrinciple of Operation
Each coordinated LORAN transmitter sendsout a continuous succession of sharp radiopulses.
LORAN uses radio signals that travel adistance of almost exactly 984 ft (300 m) amicrosecond.
At least three different LORAN signals mustbe received to determine latitude andlongitude.
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Principle of OperationPrinciple of Operation
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LORAN ChainsLORAN Chains
A system or combination of a master loranstation and two or more loran slave
stations, forming two or more pairs ofstations for loran navigation.
Every LORAN chain in the world uses aunique Group Repetition Interval (GRI)
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Group Repetition IntervalGroup Repetition Interval
(GRI)(GRI)
Length oftimebetweensuccessivetransmissions of theMaster
GRI is chosen to besufficiently large so thatthe signals from the
Master and eachSecondary in the chainhave sufficient time topropagate throughout
the chains coveragearea before the nextcycle of pulsedtransmissions begin
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LORAN ChartLORAN Chart A sample
Loran chart
showing the
location of a
master andtwo slave
stations. Also
shown are
stationidentifiers and
time
differences on
the curves.
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Other FeaturesOther Features
Loran receivers can determine the vessels
speed and course over the ground, definewaypoints, and monitor the progress of thevessel towards these waypoints
It also provides useful information such as
course corrections, estimated times of arrival,etc.
Can interface with other shipboard electronicsystems, including radar, autopilots,gyroscopes, fluxgate compasses, speed
sensors, and electronic charting systems.
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LORAN Stations in theLORAN Stations in the
PhilippinesPhilippinesCatanduanes LORAN
Station
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cargoes
Pier used by USCG personnel for loading and unloading
cargoes
USCG seaplane
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Batanes LORAN Station
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ThankThank
YOUYOU!!!!!!
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