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24 -Physics for Science and Engineers Tipler and Mosca Page 84
answ2. A constellation of satellites is usually 24 plus a few spares to allow for mishaps.
There is the Navstar GPS set, there is a Russian named Glonass, The Chinese are well through completing their set, and the European Union has made a start on Galileo.
From all of these one may obtain GPS data, and all operate in closely similar manners and frequencies for rather obvious inter-operability reasons.
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LaoIt ranges enormously; the lowest practical orbit is around 200km - orbits decay very quickly after that. A popular height is the geosynchronous orbit; 36,000km - the orbit time at that altitude is 24 hours, so the satellite appears stationary in the sky, making them ideal for satellite TV and other communications applications.
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What type of orbit is used by gps satellites subsynchronous or sunsynchronous?
Geostationary satellites are the ones used for GPS satellites.
Is a GPS an imput or output device?
GPS stands for global positioning system. it is a series of outputs from the GPS satellites and then input from their relative distance from the GPS enabled device. in other words, GPS systems are not in terms of input or output, just like you do not measure distance in voltage.
What is a GPS device?
Global positioning system, GPS, is a device that calculates its exact position on Earth in relation to latitude and longtitude, triangulated via satellites. The Answer from akakscase: I'm going to answer your question in parts so you can have a better understanding of what exactly a GPS Device is. GPS, or Global Positioning System, is a system of satelites that are orbiting the earth in a geo-synchronous orbit. That means relative to the ground they stay in the same spots in the sky. These GPS satelites send out a specific signal with a specific timing embeded in the signal. A GPS Device has a GPS reciever, an antenna specifically made to detect the signals from the satelites. When the device can detect a satelite it can use the timing in the signals to detemine it's precise distance from the satelite. When it can see more than three satelites it can use the distances to determine your position in the world. Most GPS Devices are tolerant within 30 feet, but some of the more accurate and expensive ones can be tolerant within a few inches. Tolerance is the margin or error of your position in relation to the satelites. So A GPS device is a device that uses the GPS satelites to find your position, within a margin of error, on the planet.
What is different about the motion of satellites that travel in elliptical paths compared to satellites that travel in circular paths?
Elliptical satellites don't have a constant speed, but circular satellites do
What technology discussed in the lecture might be the most helpful to hikers lost in the wilderness?
GPS would be the most helpful. It can tell the hikers where they are and where they need to go. Also, since it relies on satellites, the device will never be out of range as cell phones or radios might be.
