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A single transmitter can be used to give a line of position (LOP) of the craft. The (true) bearing to the station from the craft, TB or QUJ, is composed of the true heading, TH, plus the relative bearing, RB, of the station. The bearing from the station (QTE) is found by adding 180° to the QUJ
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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.
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380:. Values used by mobile stations usually need to be converted from Magnetic to True. (Fixed stations are expected to use True).
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The line of position is then the line of bearing QUJ (i.e. from the station to the receiver) passing through the station.
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Remembering that the LOPs pass through their respective stations, it is now simple to find the location of the craft.
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gives the position of the receiver. For the diagram on the right, the LOPs are found as before:
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Remember too, that bearings and direction are given/recorded with respect to True North and to
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A radio fix on two stations can be found in exactly the same way. The intersection of the two
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Obtaining a Line of
Position using the bearing to a single radio station.
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stations, the site of the transmitter being at the point of intersection.
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Obtaining a position fix using the bearing to two radio stations.
125:{\displaystyle {\mbox{LOP}}={\mbox{TH}}+{\mbox{RB}}+180}
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36:transmitter by bearings taken from two or more
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467:Dictionary of Military and Associated Terms
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256:{\displaystyle {\mbox{LOP1}}=120+320+180}
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332:{\displaystyle {\mbox{LOP2}}=120+40+180}
173:{\displaystyle {\mbox{LOP}}=120+40+180}
135:For the diagram on the right, we have:
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472:United States Department of Defense
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363:{\displaystyle {\mbox{LOP2}}=340}
287:{\displaystyle {\mbox{LOP1}}=260}
459: This article incorporates
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430: This article incorporates
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204:{\displaystyle {\mbox{LOP}}=340}
443:General Services Administration
1:
28:has the following meanings:
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461:public domain material
438:Federal Standard 1037C
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400:Radio direction finder
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32:The locating of a
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390:Direction finding
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38:direction finding
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22:position fixing
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449:on 2022-01-22.
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447:the original
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26:radio fix
483:Category
384:See also
76:figure.
47:Compare
419:Sources
463:from
434:from
34:radio
350:LOP2
307:LOP2
274:LOP1
231:LOP1
20:and
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315:120
282:260
251:180
245:320
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191:LOP
168:180
156:120
148:LOP
120:180
92:LOP
16:In
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321:40
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112:RB
102:TH
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355:=
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Text is available under the Creative Commons Attribution-ShareAlike License. Additional terms may apply.
