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originally posted by: Astyanax
Not possible.
Satellites in geostationary orbit hang nearly 23,000 miles above Earth's surface. That's three times the diameter of Earth itself. You can't much from up there. Satellites in lower orbits travel too fast to film anything, though still images are possible.
Satellites are used for a large number of purposes. Common types include military and civilian Earth observation satellites, communications satellites, navigation satellites, weather satellites, and research satellites. Space stations and human spacecraft in orbit are also satellites. Satellite orbits vary greatly, depending on the purpose of the satellite, and are classified in a number of ways. Well-known (overlapping) classes include low Earth orbit, polar orbit, and geostationary orbit.
About 6,600 satellites have been launched. The latest estimates are that 3,600 remain in orbit.[1] Of those, about 1,000 are operational;[2][3] the rest have lived out their useful lives and are part of the space debris. Approximately 500 operational satellites are in low-Earth orbit, 50 are in medium-Earth orbit (at 20,000 km), the rest are in geostationary orbit (at 36,000 km).[4]
Altitude classifications[edit]
Low Earth orbit (LEO): Geocentric orbits ranging in altitude from 0–2000 km (0–1240 miles)
Medium Earth orbit (MEO): Geocentric orbits ranging in altitude from 2,000 km (1,200 mi)-35,786 km (22,236 mi). Also known as an intermediate circular orbit.
Geosynchronous Orbit (GEO): Geocentric circular orbit with an altitude of 35,786 kilometres (22,236 mi). The period of the orbit equals one sidereal day, coinciding with the rotation period of the Earth. The speed is approximately 3,000 metres per second (9,800 ft/s).
High Earth orbit (HEO): Geocentric orbits above the altitude of geosynchronous orbit 35,786 km (22,236 mi).
www.polaris.iastate.edu...
Remember Kepler's second law: an object in orbit about Earth moves much faster when it is close to Earth than when it is farther away. Perigee is the closest point and apogee is the farthest (for Earth - for the Sun we say aphelion and perihelion). If the orbit is very elliptical, the satellite will spend most of its time near apogee (the furthest point in its orbit) where it moves very slowly. Thus it can be above home base most of the time, taking a break once each orbit to speed around the other side.
With the highly elliptical orbit described above, the satellite has long dwell time over one area, but at certain times when the satellite is on the high speed portion of the orbit, there is no coverage over the desired area. To solve this problem we could have two satellites on similar orbits, but timed to be on opposite sides of the orbit at any given time. In this way, there will always be one satellite over the desired coverage area at all times.
If we want continuous coverage over the entire planet at all times, such as the Department of Defense's Global Positioning System (GPS), then we must have a constellation of satellites with orbits that are both different in location and time.
In this way, there is a satellite over every part of the Earth at any given time. In the case of the GPS system, there are three or more satellites covering any location on the planet.
ARLINGTON, Va., 2 Dec. 2012. Reconnaissance and surveillance experts at the Raytheon Co. Missile Systems segment in Tucson, Ariz., are helping a U.S. military effort to provide useful persistent-surveillance imagery on-demand to the lowest-echelon warfighter in the field from small low-cost satellites.
SeeMe will develop enabling technologies that eventually could help make relevant battlefield imagery available to front-line warfighters in real time using constellations of temporary and inexpensive orbiting satellites that are launched quickly enough to support fast-moving military operations.
The SeeMe satellites would fill gaps in battlefield situational awareness before, during, and after military engagements, DARPA officials say.
The SeeMe program would provide reliable persistent-surveillance data to front-line forces using small, short-lived, very-low-cost satellites operating at low altitudes that are networked to fielded military communications systems and handheld devices.
he SeeMe short-duration satellite constellations would compensate for today's weaknesses in gathering situational-awareness data that today does not provide the lowest-echelon warfighters with on-demand satellite imagery due to the unavailability of satellite overflight opportunities, lack of information distribution channels, priority conflicts, and classification restrictions.
At the same time, terrorists and other enemy forces have access to commercial imagery information that gives them an advantage. The SeeMe program would give small U.S. squads and fire-teams reliable information in remote and beyond-line-of-sight conditions, DARPA officials say.
originally posted by: cavtrooper7
a reply to: ErosA433
YES we do.and NO we won't. WHY would WE want any other country's people or land? America has the best stuff anyway to us I'VE been to Korea and Saudi Arabia and THEY can KEEP it.I wouldn't EXPECT an ACADEMICIAN to understand.
They had a working weapon better than theTHEL in KIRKLAND in the 80s at the LASER lab and what is in fact in ORBIT I have NO idea. BUT to assume America would take over the world IF we had the power is missing the fact we already DO.
originally posted by: The Vagabond
a reply to: tetra50
That's an interesting reading, but "lack of overflight opportunities" and "priority conflicts" sounds to me like they have very limited coverage and can only observe high priority targets that they know enough about to schedule in advance.
The tech they say they are developing would seem to be a huge game changer and make this thread much more relevant to the future than the past.
…. does not provide the lowest-echelon warfighters with on-demand satellite imagery due to the unavailability of satellite overflight opportunities, lack of information distribution channels, priority conflicts, and classification restrictions.
"The lack of," and "the unavailability of," at least to me, mean much different things. "Lack," says it isn't happening, while "Unavailability," especially combined with what follows:means it's happening but not available to that level of clearance of people or troops, as is reflected in the term used previously in what I quoted:
lack of information distribution channels, priority conflicts, and classification restrictions.
"lowest-echelon warfighters."
As to "satellite overflight opportunities," this could mean something very different within the context, then you are taking it to mean. Combined with the information I quote to Astyanax about how the satellite reconnaisance works via the LEOs, their orbits and cross referencing data, including visual data, and then considering they are attempting to give troops on the ground real time information, the context would appear to mean that gaining that info at a specific TIME for a specific place of conflict, such as a spot not well populated or covered at certain times through satellite imagery, such as Afghanistan in some desert spot, indicates real time coverage for classified information at a certain level would be hard. It's much more complex than you are making it seem, and that directly applied to context.
Are you aware, for instance, that the specific group working years ago on locating Osama Bin Laden used high definition, detailed, satellite imagery to visualize in detail the compound in a Pakastani neighborhood they eventually sent the SEAL team into? They watched it for months and the comings and goings of the people there, before doing this. How is it you think they visualized in great detail, down to all the adults never being outside without totally being covered with a burkha?
tetraedit on 24-8-2014 by tetra50 because: (no reason given)edit on 24-8-2014 by tetra50 because: (no reason given)edit on 24-8-2014 by tetra50 because: (no reason given)edit on 24-8-2014 by tetra50 because: (no reason given)edit on 24-8-2014 by tetra50 because: can't get the exterior and my writing separated. when trying to do this, half of the ex text just disappears. Just trying to get my response more readable, but it appears either the comp, or ATS isn't going to allow that
This is just downright silly. Go to Google maps, for goodness sakes, click on the satellite view of any area, and look how much detail you can see. And that's what's available to the public
originally posted by: InhaleExhale
a reply to: tetra50
This is just downright silly. Go to Google maps, for goodness sakes, click on the satellite view of any area, and look how much detail you can see. And that's what's available to the public
Just a question,
I thought Google maps satellite view used images taken from aircraft or mostly from aircraft, are you certain that the satellite view are actual images from satellites in orbit?
Well, to the other replies to my post, it is fairly amusing, first the use of capitals... i expect no less from such angry sounding posts, thats right, shouting even in text, make things more right doesn't it. Yeah, iv been to a lot of countries too, understand a lot about the various cultures around the world too... you know, things are not THAT different between different counties or people.
originally posted by: GetHyped
a reply to: tetra50
It uses a mixture of satellite and aerial photography. Neither are real-time, obviously.
are you certain that the satellite view are actual images from satellites in orbit?
In the context of spaceflight, a satellite is an artificial object which has been intentionally placed into orbit.