By: Super Girl


In this report you will learn about: How fast, heavy and how many Global Positioning System satellites are. There are many interesting things about Global Positioning System and in this report you will learn it. Do you know what Global Positioning System stand for? Then read my report!!!!!!!!!!!!!!!

GPS Satellites

How fast are GPS Satellites?

According to Marshall Brain and Tom Harris. The orbits are arranged so that at any time, anywhere on Earth, there are at least four satellites "visible" in the sky.

How Heavy are GPS Satellites?

According to Tom Harris and Marshall Brain. Each of these 3,000- to 4,000-pound solar-powered satellites circles the globe at about 12,000 miles (19,300 km), making two complete rotations every day.

How many GPS Satellites are there?

According to Marshall Brain and Tom Harris. When people talk about "a GPS," they usually mean a GPS receiver. The Global Positioning System (GPS) is actually a constellation of 27 Earth-orbiting satellites (24 in operation and three extras in case one fails)

Cool Gadgets

What is a GPS criminal tracker?

According to and Mr. Welch. Here's a GPS gadget I hope you never get! It is called BluTag. BluTag is a tamper-proof ankle bracelet that communities such as San Bernadino, Calif., use to keep track of the locations of people who have been put in prison, but are now out on parole. Convicted gang members and child offenders must wear these ankle bracelets, so the police know where they are at all times. It is waterproof up to 15 feet deep, weighs only six ounces and relays the wearer's location to supervising agencies via cellular towers.

     What does a GPS Wheelchair do?

According to and Mr. Welch. This experimental wheelchair was developed by engineers in Germany. Otto Bock HealthCare has invented an all-wheel drive wheelchair that has knobby, off-road tires, a hybrid engine, and best of all--GPS. This wheelchair allows disabled drivers to cruise off-road. The GPS system is very helpful. It transmits the patient's location back to the person who is in charge of taking care of the patient. This is very helpful. If the patient gets lost or, in some cases, when a patient tries to "run away," the person in charge can track-down the location of the wheelchair. By the way, the transmitter also sends the patient's vital statistics--like heart rate, blood pressure, etc.

     When would you want a GPS personal locator?

According to and Mr. Welch. If you insist on skiing or hiking into the deepest and most forbidding wilderness, you're going to want a product such as ACR's TerraFix personal location r beaco to save your skin when you get in trouble. If, for instance, you find yourself stranded in a snowstorm on the Wickersham Wall of Alaska's Mount McKinley, the handheld device can transmit multiple distress signals with your location to let local search-and-rescue squads know where you are.

What does a GPS child mapper do?

According to and Mr. Welch. One of several new cellular plans aimed at satisfying the near-unquenchable desire of parents to check in on their children, Sprint's Family Locator allows parents to map their child's location in real time by signing into a secure Web site. Parents can "geofence" their child and receive a notification whenever the kid leaves a designated area. So, for example, if you wanted to make sure your child never left your neighborhood, you would "geofence" the cell phone to notify you if they ever left the area. Or, if could "geofence" your teenager to notify you if they ever left the county.


     Who invented GPS?

According to Tom Harris and Marshall Brain. The United States military (Army, Navy, etc.) started the GPS satellite network.  They invented it to help the military know where they were or where they were going.  Today, anyone can use the GPS satellites.

How it works

How does GPS work?

According to Marshall Brain and Tom Harris. A GPS receiver's job is to locate four or more of these satellites, figure out the distance to each, and use this information to deduce its own location. This operation is based on a simple mathematical principle called trilateration. Trilateration in three-dimensional space can be a little tricky, so we'll start with an explanation of simple two-dimensional trilateration.

     How does Trilateration work?

According to Tom Harris and Marshall Brain. If you know you are 10 miles from satellite A in the sky, you could be anywhere on the surface of a huge, imaginary sphere with a 10-mile radius. If you also know you are 15 miles from satellite B, you can overlap the first sphere with another, larger sphere. The spheres intersect in a perfect circle. If you know the distance to a third satellite, you get a third sphere, which intersects with this circle at two points.



      Thank you for reading my report. I hope you liked it.