Triagulating radio frequencies

  • Context: Undergrad 
  • Thread starter Thread starter bassplayer142
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    Frequencies Radio
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Discussion Overview

The discussion revolves around methods for triangulating the location of radio frequencies, particularly in the context of locating illegal FM broadcasts. Participants explore different approaches, including the number of vehicles needed for triangulation and alternative techniques for determining signal direction.

Discussion Character

  • Exploratory
  • Technical explanation
  • Debate/contested

Main Points Raised

  • One participant suggests that triangulation requires three vehicles to form a triangle and use simultaneous equations to determine the source of the signal.
  • Another participant argues that only two vehicles are necessary to create two intersecting lines for locating the signal.
  • A different participant shares their personal experience of successfully solving the triangulation problem using only two vehicles and expresses curiosity about the actual methods used by agencies.
  • Some participants propose an alternative method involving covering the radio with metal foil to determine the direction of the signal without measuring its strength.
  • One participant mentions using the time it takes for the signal to reach different vehicles to calculate distances, while also acknowledging the potential effectiveness of the foil method.

Areas of Agreement / Disagreement

Participants have differing views on the number of vehicles required for triangulation, with some advocating for two and others for three. Additionally, there are multiple proposed methods for determining signal direction, indicating that the discussion remains unresolved.

Contextual Notes

Some assumptions about the methods of triangulation and signal detection are not fully explored, and there is uncertainty regarding the actual practices used by agencies in the field.

bassplayer142
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I was just thinking the other day about how they triangulate on radio frequencies. Imagine an illegal fm broadcast they are trying to find. From thought (not necessarily right), they would have 3 vehicles with receivers that would form a triangle and depending on angles and the time it takes for the signal to reach each vehicle. Using some simultaneous equations they can figure out where it is from. I'm not asking anyone to do the math here as I don't know where to start. Is there any website out there or anything that anyone could lead me to. Thanks.
 
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I think they would need just two vehicles.
(the enough to get two lines)
 
Funny thing, I couldn't help but try this myself partly from boredom and it is just a great application and math practice. I did end up solving it just a minute ago and I only did need two vehicles. Is this how they do it because It seems logical and I don't know any other way. If anyone is interested in the answer let me know.
 
No need to measure signal strength. Just cover the radio up with metal foil in all but one direction, and rotate the radio/foil to determine which direction the radio signal is coming from.
 
maze said:
No need to measure signal strength. Just cover the radio up with metal foil in all but one direction, and rotate the radio/foil to determine which direction the radio signal is coming from.

Do it twice, at different places, and you will get the "2 lines" stated in post #2.
 
My attempt was not to measure signal strength but the time for the signal to reach the separate vehicles. Using the difference you can find the distances. The foil approach sounds like a good idea. Does anyone know how agencies actually do this?
 

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