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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!!!!!!