WEBVTT

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- [Narrator] This is a Navy F-4
from Point Mugu, California,

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equipped with a GPS
navigation and bombing system.

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Flying 1,000 feet above
the ground at 450 knots,

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he starts a 4G pull up and
tosses a 500-pound bomb

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at a tank nearly two miles away

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and scores a near bull's-eye.

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These tests were made in August, 1981

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at Nellis Air Force Base Nevada.

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16 bombs were dropped during four sorties.

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Two sorties were flown by a
Tactical Air Command pilot.

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On the other two sorties,

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a TAC F-4 flew alongside the GPS F-4.

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The TAC F-4 carries a Pave Tack pod,

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which includes a forward
looking infrared system or FLIR.

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This is FLIR imagery of the bomb run.

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The GPS set measures range and Doppler

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along the line of sight
from four Navstar satellites

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to compute highly accurate
position and velocity.

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The GPS data is used to
update an inertial platform.

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All that is needed

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is target position, latitude,
longitude, and elevation.

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With that input, GPS will
navigate to the release point

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in any weather, day or
night, and do it passively.

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Since target acquisition is not required,

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the crew can stay on
the deck until release

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and a first-pass delivery is assured.

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Bomb scoring was provided by triangulation

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from two remote TV cameras.

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The image at the top of your screen

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is from a camera to the east.

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At the bottom is the view from the north.

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Overall scores for these
tests are classified.

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However, system accuracy
data may be obtained

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from the GPS Joint Program
Office in Los Angeles.

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The GPS Program Office is grateful

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to the 57th Fighter Weapons Wing

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and the 422nd Fighter Weapons Squadron

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for their support in these tests.