GPS sattelites

nruta84

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Aug 26, 2010
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Sweden
Hi i'm working as a surveyor and i use a GPS allot right now, so i was wondering if the app shows GPS satellites or is it only tv satellites?
If it's only tv would it be possible to add the GPS satellites manually with the PRO version of DishPointer?
 

AlanSH

DishPointer.COM Admin
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Sep 4, 2007
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It does only geostationary satellites. The GPS satellites are in general not geostationary.
 

nruta84

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New Member
Aug 26, 2010
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Sweden
It does only geostationary satellites. The GPS satellites are in general not geostationary.
Ok, thats what i was afraid of.
It would be nice if you could add the gps calendar into the app so it could calculate where the satellites would be.
I have this function in my GPS at work (Leica 1200 gps) but it can only produce a flat skyplot and its not so easy to know exactly where the satellites are.
 

navychop

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Why would you want to know where a GPS satellite was at any given moment? They are constantly moving in relation to the ground.
 

nruta84

Thread Starter
New Member
Aug 26, 2010
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Sweden
Why would you want to know where a GPS satellite was at any given moment? They are constantly moving in relation to the ground.
Right now i'm measuring a lot in the vicinity of pretty dense forest and sometimes (quite often) it would be nice to ruffly know where the satellites are, to be able to make a decision which side of a narrow forest road i want to put these new measured spots.
 

satcomconsultant

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Aug 27, 2010
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Gapland, Md
GPS Satellites

GPS satellites are in an elliptical orbit (kinda like what the space shuttle does) and are difficult to predict. Also multiple GPS satellites must be able to be received ( at least 3 for location, 4 for location and elevation) so knowing where any one was would probably not be helpful. they move at such a speed that any one of them is only within view for a few hours before another takes over for it.
It is cool that this app is able to roughly calculate where the stationary satellites are and it is useful for site surveys for satellite antenna location, some further features would be cool, but i doubt that it will be able to calculate where GPS satellites are located in the near future.
 

harshness

SatelliteGuys Master
May 5, 2007
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Salem, OR
...but i doubt that it will be able to calculate where GPS satellites are located in the near future.
Why would predicting their positions be so difficult?

It looks like they come out with a new TLE pretty much every day and they don't seem to change a whole lot from one to the next.

Here's the last five TLEs for NavStar 65:

1 36585U 10022A 10235.91290462 .00000002 00000-0 10000-3 0 1107
2 36585 055.0346 079.7421 0005052 123.8988 236.2335 02.00549571 1753
1 36585U 10022A 10236.41151680 .00000002 00000-0 10000-3 0 1112
2 36585 055.0345 079.7226 0005022 124.0979 236.0339 02.00549595 1764
1 36585U 10022A 10237.40874069 +.00000001 +00000-0 +10000-3 0 01125
2 36585 055.0348 079.6829 0005082 124.6929 235.4407 02.00549683001781
1 36585U 10022A 10238.40595836 -.00000001 00000-0 10000-3 0 1129
2 36585 055.0353 079.6431 0005161 125.3717 234.7577 02.00549732 1805
1 36585U 10022A 10238.90456613 -.00000002 00000-0 10000-3 0 1135
2 36585 055.0355 079.6228 0005152 125.0270 235.0988 02.00549748 1810
 

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