Everyday Einstein: Demonstrating GPS Trilateration
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- Опубліковано 7 тра 2012
- Using simple materials and a map of the world, you can demonstrate how GPS determines a location. For a full description of this hands-on classroom activity, see Activity 2 in Perimeter Institute’s free classroom resource, Everyday Einstein: GPS and Relativity.
Download the teacher's guide, modifiable worksheets, and supporting materials at: resources.perimeterinstitute....
Perimeter's educational outreach programs and resources like these are made possible in part thanks to our donors. Be part of the equation: perimeterinstitute.ca/donate. - Наука та технологія
Thanks for the visual. Great job!
Never understood this fully before, thank you.
Your explanation was helpful. Thank you.
Note that there are always errors when measuring. The more satellites you have, the more data you can use to reduce the error.
nice and excellent explanation Gentleman
this is really cool reminds me of NonEuclidean geometry.
How will you fix the radius of circle ?
comment vous avez fait l'animation? Je serai heureuse si vous me répondez!
how does the satellite know where he is???
was wondering the same
I dont think it does, perhaps it just knows how far away it is from your phone. Wouldn't that be enough for the trilateration?
The receiver just uses d = s * t where s is speed of light constant speed, t is the time taken to receive the signal say 2 sec, 3 sec etc. Th receiver just need to know how d. Once it gets from all 4 satellite its knows where it is. If we draw this manually we know. But for the system simulate the same effect of drawing and figuring where it all intersects is some other calculation.
How does the stalite know that it is 20k abve Stockholm?
Thanks! So GPS uses Trilateration and not Triangluation because no angles are involved in the calculations right?
+Kevin HANG Right, they are totally different concepts. Triangulation just involves a angle and known distance, then you got the, say height of a tree, while trilateration makes use of 4 distances of satellites with known positions to intersect a point, i.e., the position of GPS receiver.
Thank you !
@@ryan7499 How does the satellite knife where he is? He needs a GPS himself in my mind...
@@funkybrain lol, I believe its orbit is known and position is mutable at any moment by the US gov.
why do you need 30 satellites to orbit earth?
paideguinha the more you have, the smaller the error is
Few of them are spares if one breaks down and to improve accuracy
Why do I think this is not possible .. If we are talking about measuring the time then, how signal processing from reception detection, filtering amplification and conversion from analogue to digital, decoding that is extracting the information from the signal and then doing this for 3 or four different signals coming from 3 different satellites.. how is that done? technically speaking ?
this requires tuning to a different satellite signal !!
I honestly believe that this is a Ground service using mobile cell network and has nothing to do with satellites
constants. right?!. I mean the signal processing and other overheads remain constant.
or the measured once how long the signal processing took ad subtract it to give the actual value.
first!
Be sure to read Activity review on my blog before you buy. Go to *thoughtreviews. com/activity-review/* Thanks. Reza.