space - GEO/LEO and relativity (1 Viewer)

[mr EaZy]

Alright i got two probs -*appreciate any input

umm what are the two MAIN reasons why some communications companies would put up a GEO over an LEO satellite. And Vise versa why LEO?


And also What are the 2 main discrepancies einsteins relativity theory caused with the present day info on relativity. This was from a question but i didnt think it was very clear.
thnx

 

[mr EaZy]

also, is anyone doing VOn BRaun?
should i stick with him or move on to someone else?

 

[fush]

yea im doin Von Braun..just talk about the V-2 rocket and its involvment in the war...then how he helped develop the SAturn V rocket...blah blah..i have more info if u need it

with GEO satellites the postion of the satellite in the sky does not change, hence a telescope with a single fixed position is needed... I dont konw about cost though, because GEO have muhc higher altitudes and hence might be more expensive to launch and mantain, i dunno

 

[JayWalker]

Alright i got two probs -*appreciate any input

umm what are the two MAIN reasons why some communications companies would put up a GEO over an LEO satellite. And Vise versa why LEO?


And also What are the 2 main discrepancies einsteins relativity theory caused with the present day info on relativity. This was from a question but i didnt think it was very clear.
thnx

Well it really depends, If you are talking about communications such as Television, then ofcourse they would use a GEO. This allows the satellite to be in the same position in the sky. Hence, your satellite dish is directed in that direction permanantly...

If communications = Telephone, A GEO would be as usefull as a LEO, only reason i can think of why they'd want a GEO is if they are actually using it as a satelite to transfer images of earth back to them, and Easier to maintain [updating software on it easier to target..]

On Television, LEO prefferred- -.. Well, they're not..

Telephone - Cheaper than GEO, [maintain and getting it up there], Spreading the area of communication.

Helpfull? rep---eat the question?

 

[Assasinator_2]

GEO = stationary therefore doesn't involve tracking equipment on the ground to keep data link.

LEO = covers entire of earth multiple times per day (i cant remember, been a semester since i did orbital mechanics) and thus gets more than 1/8 or whatever it is that a GEO can cover, of the earth.

 

[Shuter]

Leo will have less time lag because it's not as far away, GEO will not be as susepable to slowing down from atmospheric friction.

 

[CrashOveride]

GEO also, due to its altitude [35,800km] is in the upper limits of the van allen radiation belts and near the edge of the magnetosphere, which can make them useful for scientific purposes/research

 

[mr EaZy]

oh yeah some good points were raised here.
Thnx a lot guys

 

[Jase]

holy crap wtf is a GEO and LEO???

 

[JayWalker]

Just different types of orbits
GEO is a Geosynchronous orbit, i.e. has a period of 24 hours - this is NOT i repeat NOT The same as a GeoSTATIONARY.

A Geosynchronous orbit has period of 24 hours, but does not necessarily have to be on equator, i.e. it will make a figure 8 pattern. Like you see on movies..

A Geostationary orbit is a geocynchronous orbit but is located on equator making it in same loc in sky.

Its like a square is a rectangle but a rectangle is not a square..

A LEO is a Low Earth Orbit... Its lower than the GEO orbits and as such, has a period < 24 hours... so its always moving in the sky relative to earth..

 

[Jase]

ahahha phew,right. I thought, since LEO is low earth, GEO is some kinda.. Great Earth Orbit

 

[gordo]

do we need to know synchornous
or is that just a type of heo

 

[smallcattle]

i dont think Geosynchronous is in the syllabus

 

[JayWalker]

Well thanks cattle, but you do...
Not trying to be mean but I'd appreciate you acutally check the syllabus before saying "I dont think you need to know this" and "I dont think they'll ask us that"... Check first please,
Yes you do need to know this, it is in the syllabus, right next to GeoStat, and LEO..

do we need to know synchornous
or is that just a type of heo

What the hell is a HEO?
is that GEO?

You need to know the difference between Geocynchronous and Geostationary..

 

[gordo]

heo = high earth orbit

geostationary is a high earth orbit
so is geosynchronous
do we need to know either or only geostationary

 

[JayWalker]

b o t h 10

 

[helper]

Jay before you go off the point is

compare qualitatively low Earth and geo-stationary orbits

geo synch are not mentioned

 

[JayWalker]

have you read the rest of the syllabus? scary thing..

 

[helper]

yes, and geo synch is not mentioned

 

[mr EaZy]

yea im doin Von Braun..just talk about the V-2 rocket and its involvment in the war...then how he helped develop the SAturn V rocket...blah blah..i have more info if u need it

Thnx fush, but u dont have to go through all that trouble just for me...


its just that the other guys are much more popular thats all.
im sticking with von braun:

-he did high altitude research at New Mexico
-worked on V-1 and V-2 rockets
-he then helped send up the first Saturn V rockets to space, which even brought the first men to the moon.