0
2.02E04Km * 1E03 m/Km * 1s/2.99792458E08m/s = 6.73799E-02s
20,000Km from Earth converted to meters divided by C in m/s
But of course of the roughly 12 of the satellite constellation (of 24) in your hemisphere, some will be much further away than others.
(You need a reliable signal from at least four satellites for a useful reading.)
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Is a GPS system based on a constellation of four satellites strategically placed around the Earth?
No, for GPS to work there must be 24 operational satellites in orbit, with 12 of those above the horizon as seen from any point on earth.For a GPS receiver to get a latitude-longitude fix it must receive signals from a minimum of 3 satellites and to also get altitude it must receive signals from a minimum of 4 satellites. Each satellite that it receives above these minimums allows the receiver to get a more precise fix.
How many satellites are in view at all times to the gps user?
Possibly none, if the BPS receiver is under an overpass or under dense leaf trees.A minimum of 4 satellites must be in view to obtain a good location. Only a little more than half of all the 24 GPS satellites are even possible to be viewed from a given location.
How do GPS systems pinpoint locations across the globe?
GPS systems use the twenty-seven satellites that orbit the earth. The GPS receiver uses a mathematical equation similar to trilateration. The GPS receiver uses four or more of the satellites that are constantly orbiting the earth and use the information received to find it's location.
How does a GPS receiver work?
A GPS (short for "Global Positioning System") is an electronic device that measures its distance to three or more satellites to determine its precise location. There are 24 such satellites in fixed orbits around the world. All of the satellites are perfectly synchronized, and send out digital radio transmissions broadcasting the current time. Your GPS receiver receives three or more of these signals, where the distance to the satellite will delay the signal just a tiny bit. The GPS receiver uses the relative delays to determine its precise location. GPS receivers are available from Garmin, Magellan, Tom Tom, and a number of other companies. Many newer cellphones also have a built-in GPS receiver.
How does a GPS receiver calculate its distance from a satellite?
Very easily. The GPS receiver measures how long it takes a certain radio signal to travel from the GPS satellite(s) to itself, and from that, the receiver calculates the distance. It can do that because it knows precisely how fast the radio signal travels.If you have signals from at least 3 satellites, the process of trilateration (not triangulation) pinpoints the location where the 3 distances 'cross' each other. If you have 4 satellites 'locked in', then you will find out your altitude, too. (The process is not quite this simple, but to go on would be confusing.)The hard part is measuring the precise time it takes for a certain radio signal to travel from the GPS satellite to your GPS receiver. Well, hard if you do it, but very easy when the GPS receiver does it!First, each GPS satellite carries an on-board atomic clock. This clock is outrageously accurate, but even so, ground stations connected to the US Navy atomic clock system keep each satellite precisely at the correct time. Your GPS receiver has an on-board high-precision clock of its own.Second, when your GPS receiver first makes contact with the constellation of GPS satellites, it is sent an 'almanac' that lists where each satellite is, what it's precise time is, and other goodies. After reading the almanac, the GPS receiver sets itself to the precisely same time as the satellite constellation.Thirdly, when the GPS receiver gets a signal from the satellites, there is information in it that says precisely at what time the radio signal left each satellite, which is identical for all the satellites. Then your GPS receiver 'looks at its watch' and subtracts the 'sent' time from the 'received' time. The data in the almanac are updated by the satellite constellation every few hours so that your GPS receiver will always know where the satellites are and what their precise time is.Go back to the beginning and reread what your GPS receiver can do once it knows the precise travel time of the radio signal.
How many gps satellites are required to pinpoint your location on earth surface?
To determine latitude and longitude the minimum number of satellites that the receiver must lock onto is three. To also determine elevation the minimum number of satellites that the receiver must lock onto is four. If the receiver can lock onto more satellites then it can improve the calculations to get a more precise location.
Is a GPS system based on a constellation of four satellites strategically placed around the Earth?
No, for GPS to work there must be 24 operational satellites in orbit, with 12 of those above the horizon as seen from any point on earth.For a GPS receiver to get a latitude-longitude fix it must receive signals from a minimum of 3 satellites and to also get altitude it must receive signals from a minimum of 4 satellites. Each satellite that it receives above these minimums allows the receiver to get a more precise fix.
Can 2 satellites run gps?
If your hand-held receiver only hears 2 GPS satellites, then it'll indicate a location, but what it indicates won't be accurate or reliable.
How many satellites are in view at all times to the gps user?
Possibly none, if the BPS receiver is under an overpass or under dense leaf trees.A minimum of 4 satellites must be in view to obtain a good location. Only a little more than half of all the 24 GPS satellites are even possible to be viewed from a given location.
How do GPS systems pinpoint locations across the globe?
GPS systems use the twenty-seven satellites that orbit the earth. The GPS receiver uses a mathematical equation similar to trilateration. The GPS receiver uses four or more of the satellites that are constantly orbiting the earth and use the information received to find it's location.
How does a GPS receiver work?
A GPS (short for "Global Positioning System") is an electronic device that measures its distance to three or more satellites to determine its precise location. There are 24 such satellites in fixed orbits around the world. All of the satellites are perfectly synchronized, and send out digital radio transmissions broadcasting the current time. Your GPS receiver receives three or more of these signals, where the distance to the satellite will delay the signal just a tiny bit. The GPS receiver uses the relative delays to determine its precise location. GPS receivers are available from Garmin, Magellan, Tom Tom, and a number of other companies. Many newer cellphones also have a built-in GPS receiver.
What does orbiting satellites that send radio signals to a receiver on Earth make up?
GPS system
What is the use of a GPS?
GPS is Global Positioning System. A GPS receiver triangulates vehicle position from a network of GPS satellites in orbit around the earth. Mapping programming and data in the receiver then shows you where you are, and it can give you directions for how to navigate from one place to another.
How many gps transmitter can be connected with one gps receiver?
One GPS satellite can serve an unlimited number of receivers, if they have unobstructed line-of-sight. GPS receivers need to see a minimum of 4 satellites in order to calculate an accurate 3-dimensional position. Almost all of them have the ability to work with up to 12 satellites simultaneously, if they can see that many.
How many GPS Satellites does the US Deptartment of Defense have?
There are currently 30 healthy GPS satellites in orbit.
How does a GPS receiver calculate its distance from a satellite?
Very easily. The GPS receiver measures how long it takes a certain radio signal to travel from the GPS satellite(s) to itself, and from that, the receiver calculates the distance. It can do that because it knows precisely how fast the radio signal travels.If you have signals from at least 3 satellites, the process of trilateration (not triangulation) pinpoints the location where the 3 distances 'cross' each other. If you have 4 satellites 'locked in', then you will find out your altitude, too. (The process is not quite this simple, but to go on would be confusing.)The hard part is measuring the precise time it takes for a certain radio signal to travel from the GPS satellite to your GPS receiver. Well, hard if you do it, but very easy when the GPS receiver does it!First, each GPS satellite carries an on-board atomic clock. This clock is outrageously accurate, but even so, ground stations connected to the US Navy atomic clock system keep each satellite precisely at the correct time. Your GPS receiver has an on-board high-precision clock of its own.Second, when your GPS receiver first makes contact with the constellation of GPS satellites, it is sent an 'almanac' that lists where each satellite is, what it's precise time is, and other goodies. After reading the almanac, the GPS receiver sets itself to the precisely same time as the satellite constellation.Thirdly, when the GPS receiver gets a signal from the satellites, there is information in it that says precisely at what time the radio signal left each satellite, which is identical for all the satellites. Then your GPS receiver 'looks at its watch' and subtracts the 'sent' time from the 'received' time. The data in the almanac are updated by the satellite constellation every few hours so that your GPS receiver will always know where the satellites are and what their precise time is.Go back to the beginning and reread what your GPS receiver can do once it knows the precise travel time of the radio signal.
What is a GPS Receiver?
GPS receivers is the third component of the GPS system. These range from navigation systems found on planes and in cars to hand held devices now available. A receiver uses signals received from three or more satellites to determine the position of the user.
