answersLogoWhite

0

For an unconstrained solution, you need 4 satellites in view to get a GPS fix. If you know one variable, such as altitude (on a ship, for instance) you can do it with 3.

User Avatar

Wiki User

14y ago

What else can I help you with?

Continue Learning about Natural Sciences

How many satellites does it take for GPS to find something?

Your receiver must pick up at least 4 to get an accurate 3D lock. If your receiver can safely assume you are on or near surface of earth it can get a good 2D lock with just 3. This is usually a safe assumption to make, especially with civilian receivers. Less than 3, all it can do is set its clock.


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.


Where does a gps receiver get its signal?

The Global Positioning System (GPS) consists of 24 satellites that orbit the Earth at a height of 20,000 km. Receivers at stations on Earth (such as WES2 in Westport, Massachusetts) use the signals from satellites to calculate the location of the station. Geoscientists have set up a network of targets all over the world in order to monitor the movement of lithospheric plates. Steel spikes pounded into the ground (preferably embedded in solid rock) make up the targets. A high-precision GPS receiver is then mounted on a tripod and positioned directly above the target. The targets are revisited over a period of months or years. The receiver measures the distance to four or more GPS satellites and then uses stored data on satellite locations to compute the location of the target. Changes in horizontal and vertical positions can be detected within several millimeters.


Why does the GPS unit need to interact with a minimum of 3 different satellites in order to give an accurate location?

The only thing your unit can tell from a single satellite is roughlyhow far you are from that satellite.But what you want is your location nailed down in 3 dimensions ...where you are left/right, where you are forward/backward, andwhere you are up/down. Your receiver calculates each of theseby comparing its distance from different satellites.And if you want all three dimensions, then you need a minimumof four (4) different satellites, not 3.


Can gps receivers calculate altitude?

Depends on the GPS device. Although ALL of them do have the raw data received from the satellites in order to calculate it, you would have to to consult your specific device to know if it will to provide the user with that information. Simply put, a GPS is time data receiver. It receives time data from many satellites and according to the time it took from the data to get to the device ( always some milliseconds), it calculates the distance from each one of them. Once it has determined the distance from at least a number of satellites (usually at least 4), a mathematical function will determine the exact 3-dimensional position of the GPS itself; that is Latitude, longitude and altitude. All you will have to do is determine whether a specific GPS brand and model will display the altitude numbers also or only latitude and longitude.

Related Questions

Where can one purchase a Sky Receiver?

You can purchase a Sky Receiver online at Satellites Superstores. The Receivers all come with handset, leads and a manual. You will also get discounted shipping with any order done on the website.


How many satellites does it take for GPS to find something?

Your receiver must pick up at least 4 to get an accurate 3D lock. If your receiver can safely assume you are on or near surface of earth it can get a good 2D lock with just 3. This is usually a safe assumption to make, especially with civilian receivers. Less than 3, all it can do is set its clock.


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 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.


What do you have to have to make a GPS work?

GPS devices receive signals from several Global Positioning Satellites, which orbit the earth. The device uses the difference in timing from the signals to calculate its own position. I don't remember, but I think you can get a position with signals from 4 satellites, so you would need to have a clear signal from the satellites in order for the device to calculate its position.


Where does a gps receiver get its signal?

The Global Positioning System (GPS) consists of 24 satellites that orbit the Earth at a height of 20,000 km. Receivers at stations on Earth (such as WES2 in Westport, Massachusetts) use the signals from satellites to calculate the location of the station. Geoscientists have set up a network of targets all over the world in order to monitor the movement of lithospheric plates. Steel spikes pounded into the ground (preferably embedded in solid rock) make up the targets. A high-precision GPS receiver is then mounted on a tripod and positioned directly above the target. The targets are revisited over a period of months or years. The receiver measures the distance to four or more GPS satellites and then uses stored data on satellite locations to compute the location of the target. Changes in horizontal and vertical positions can be detected within several millimeters.


What is mobile radio communication?

Mobile radio communication is performed by utilizing a battery-powered radio in the field in order to transmit messages to a fixed home base receiver.


Why does the GPS unit need to interact with a minimum of 3 different satellites in order to give an accurate location?

The only thing your unit can tell from a single satellite is roughlyhow far you are from that satellite.But what you want is your location nailed down in 3 dimensions ...where you are left/right, where you are forward/backward, andwhere you are up/down. Your receiver calculates each of theseby comparing its distance from different satellites.And if you want all three dimensions, then you need a minimumof four (4) different satellites, not 3.


Do you need satellite radio to use gps?

No, that won't work.You need a special GPS receiver with a super-accurate clock in it (and lots of other goodies) in order to take advantage of GPS signals from the group of 24 GPS satellites.


How are satellites numbered?

Usually in order of their launch.


What does one need a freeview receiver for?

A Freeview receiver is a receiver linked to a television broadcaster. In order to access these free-to-air services, one will require a Freeview receiver.


What is a satellite receiver?

A satellite TV receiver is needed in order to view satellite programming. Additionally, a satellite dish is needed in order for the receiver to decode digital signals which then allows you to watch TV.