Hypberbolic Navigation System

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    HYPERBOLICNAVIGATION SYSTEM

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    Definition

    A navigation system that produceshyperbolic lines of position (LOPs)through the measurement of the

    difference in times of reception ofradio signals from two or moresynchronized transmitters at fixedpoints. Such systems require the use ofa receiver which measures the time or

    phase difference between arrivingradio signals.

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    Definition

    A radio navigation system which

    enables the position of an aircraftequipped with a suitable receiver to be

    fixed by two or more intersectinghyperbolic position lines. The systememploys either a time differencemeasurement of pulse transmissions or

    a phase difference measurement ofphase-locked continuous wavetransmissions.

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    Introduction

    Hyperbolic navigation systems workby measuring the time differencesin receiving radio signals from two

    or more synchronized transmitterson land. On board ship, a receivermeasures this time or phasedifference, allowing a position to becalculated.

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    Hyperbolic Position Lines

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    Hyperbolic Position Lines

    Two radio transmitting points are designatedMand S, with concentric circles around eachto indicate distances traveled by the radiatingsignals. The various points at which the circles

    intersect create a family of hyperbolas, withthe straight line through AB representing allpoints that are equidistant between Mand S.Based on the time delay in receiving thesimultaneous signals from Mand S, theposition of the craft can be determined.

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    Introduction

    A number of these systems weredeveloped from the 1930s,including Gee, Omega, Decca andLoran.