Radio fix
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(′rād·ē·ō ′fiks)
(communications) Determination of the position of the source of radio signals by obtaining cross bearings on the transmitter with two or more radio direction finders in different locations, then computing the position by triangulation.
(navigation) Determination of the position of a vessel or aircraft equipped with direction-finding equipment by ascertaining the direction of radio signals received from two or more transmitting stations of known location and then computing the position by triangulation. Determination of position of an aircraft in flight by identification of a radio beacon or by locating the intersection of two radio beams.
Oxford Dictionary of the US Military:
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radio fix
The position of a ship, aircraft, or ground radio transmitter as determined by use of radio signals.
See the Introduction, Abbreviations and Pronunciation for further details.
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(DOD) The location of a ship or aircraft by determining the direction of radio signals coming to the ship or aircraft from two or more sending stations, the locations of which are known.
McGraw-Hill Dictionary of Aviation:
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radio fix
i. Locating a radio transmitter by bearings taken from two or more direction-finding stations, with the site of the transmitter at the point of the intersection. See fix.
ii. Locating an aircraft by determining the direction of radio signals coming to the aircraft from two or more sending stations whose locations are known.
ii. Locating an aircraft by determining the direction of radio signals coming to the aircraft from two or more sending stations whose locations are known.
Wikipedia on Answers.com:
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Radio fix
In telecommunication and position fixing, the term radio fix has the following meanings:
- The locating of a radio transmitter by bearings taken from two or more direction finding stations, the site of the transmitter being at the point of intersection.
- The location of a ship or aircraft by determining the direction of radio signals coming to the ship or aircraft from two or more sending stations, the locations of which are known.
Compare triangulation.
Obtaining a Radio Fix
A single transmitter can be used to give a line of position (LOP) of the craft. The (true) bearing to the station from the plane, TB or QUJ, is composed of the planes true heading, TH, plus the relative bearing, RB, of the station. The bearing of the plane from the station (QTE) is found by adding 180° to the QUJ figure.
The line of position is then the line of bearing QUJ (i.e. from the station to the plane) passing through the station.
- LOP = TH + RB + 180
For the diagram on the right, we have:
- LOP = 120 + 40 + 180
- LOP = 340
A radio fix on two stations can be found in exactly the same way. The intersection of the two position lines gives the position of the plane. For the diagram on the right, the LOPs are found as before:
- LOP1 = 120 + 320 + 180
- LOP1 = 260
- LOP2 = 120 + 40 + 180
- LOP2 = 340
Remembering that the LOPs pass through their respective stations, it is now simple to find the location of the aircraft.
Remember too, that bearings and direction are given/recorded with respect to True North and to Magnetic North. Values used by mobile stations usually need to be converted from Magnetic to True. (Fixed stations are expected to use True).
Sources
This article incorporates public domain material from the General Services Administration document "Federal Standard 1037C".- This article incorporates public domain material from the United States Department of Defense document "Dictionary of Military and Associated Terms".
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Copyrights:
McGraw-Hill Science & Technology Dictionary
McGraw-Hill Dictionary of Scientific and Technical Terms. Copyright © 2003, 1994, 1989, 1984, 1978, 1976, 1974 by McGraw-Hill Companies, Inc. All rights reserved.
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Oxford Dictionary of the US Military
The Oxford Essential Dictionary of the U.S. Military. Copyright © 2001, 2002 by Oxford University Press, Inc. All rights reserved.
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US Defense Department Military Dictionary
US Department of Defense Dictionary of Military and Associated Words, 2003.
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McGraw-Hill Dictionary of Aviation
An Illustrated Dictionary of Aviation.. Copyright © 2005 by McGraw-Hill Companies, Inc. All rights reserved.
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