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Online Information on gps satellite tracking

The GPS or Global Positioning System is a global navigation system used for military and civilian applications alike.

As a positioning system, GPS allows users to map waypoints, tracking their position on a map to within a few meters of their exact location. Civilian use GPS systems are made by companies such as Magellan, Garmin and Trimble.


Each satellite repeatedly re-broadcasts the exact time according to its internal atomic clock along with a digital data packet that includes the satellite's precise position, satellite status messages, and an almanac of the approximate position of every other active GPS satellite. The almanac lets GPS receivers use data from the strongest satellite signal to locate other satellites.

GPS derives in part from its predecssor, the LORAN navigation system. LORAN was designed for ship and airplane navigation in the 1940s for use during World War II.

Atomic clocks on the GPS satellites are set to "GPS time", which is the number of seconds since 00:00:00 UTC, January 6, 1980. UTC is short for Coordinated Universal Time. Today, GPS time is 14 seconds ahead of UTC, because it does not follow leap seconds. That's why new GPS units initially show the incorrect time after achieving a GPS lock for the first time. However, this is usually corrected on the display within 15 minutes once the UTC offset message is received for the first time.

Most ships and airplanes are equipped with GPS systems so that they can accurately plot on a map where they are. In planes, this is especially useful during bad weather, and in ships in knowing where shallow water and other sunken obstacles may lie.

One of biggest problems for GPS accuracy is that changing atmospheric conditions change the speed of the GPS signals unpredictably as they pass through the ionosphere. The effect is minimized when the satellite is directly overhead and becomes greater toward the horizon, as the satellite signals must travel through the greater "thickness" of the ionosphere as the angle increases. Once the receiver's rough location is known, an internal mathematical model can be used to estimate and correct for the error.

Selective Availablity typically added signal errors of up to about 10 m horizontally and 30 m vertically. The inaccuracy of the civilian signal was deliberately encoded so as not to change very quickly, for instance the entire eastern US area might read 30 m off, but 30 m off everywhere and in the same direction. In order to improve the usefulness of GPS for civilian navigation, Differential GPS was used by many civilian GPS receivers to greatly improve accuracy.

When it was first deployed, GPS included a feature called Selective Availability (or SA) that introduced intentional errors of up to a hundred meters into the publicly available navigation signals, making it difficult to use for guiding long range missiles to precise targets. Additional accuracy was available in the signal, but in an encrypted form that was only available to the United States military, its allies and a few others, mostly government users.

GPS is coming into common use in cars these days. Most new cars allow you to purchase GPS technology that will help you plot your trip from one location to the next.

The GPS system uses a satellite constellation of 24 satellites in intermediate circular orbits. The orbits are designed so at least four satellites are always within line of sight from almost any place on earth. The constellation also includes three spare satellites in orbit.

The author would have loved to have used GPS years ago in college. We had a class where we used maps and compasses. We were given precise coordinates and had to plot a course through woods and streams and swamps to find and sign in at specific latitude and longitude coordinates. Today, this sport, now called "geocaching", is a popular activity, particularly for outdoor hiking enthusiasts.

In 1998, Vice President Al Gore announced plans to upgrade GPS with two new civilian signals for enhanced user accuracy and reliability, particularly with respect to aviation safety.

In 1985, ten experimental Block-I satellites were up. A complete "constellation" of 24 satellites was in orbit by January 17, 1994.

Hand-held GPS units are often used by hikers and mountain climbers to plot their courses and to accurately reflect exactly where they are. The author once used GPS to organize a helicopter evacuation of an injured motorcycle rider in a remote region of the La Sal mountains in Utah. A reading was taken, coordinates given, and the pilot was able to find us with ease.

GPS receivers calculate their current position (latitude, longitude, elevation), and the precise time, using the process of trilateration after measuring the distance to at least four satellites by comparing the satellites' coded time signal transmissions.

In 1996, President Bill Clinton issued a policy directive declaring GPS to be a dual-use system, meaning that it could be made avilable for a wide range of civilian and military purposes.



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Offers satellite GPS tracking system units and services for vehicle tracking and fleet management. Your GPS solutions provider. Call (866)320-5810.

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Product features of the Tracker 1000 device; the advanced satellite GPS vehicle tracking system & fleet management software with cutting edge technology.

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GPSTrackingInfo.com | The Latest News and Info in the Security and Tracking Space including Vehicle, Fleet and Personal Tracking

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17. GPS Satellite Tracking System, Software Information
Information about how the gps satellite tracking system and its software works and how the technology can be used to track vehicles.

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900 MHz Wireless GPS tracking devices. ... GPSFlight manufactures the smallest, most capable high performance GPS tracking and telemetry tools in the industry. ...

20. Primer On Satellite Car Tracking
A Little History Of Vehicle Tracking Non-GPS Tracking Systems ... The black box within the magnetic mount beans a signal to a GPS satellite and then receives it's location. ...

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23. SPOT Personal GPS Satellite Tracker - GPS Tracking Devices
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24. Mobile cell phone GPS tracking
GSM mobile phone tracking system via the GPS-TRACK satellite network ... We are not responsible for possible tracking errors that may occur. Use areas ...

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Offers asset tracking products including flight, iridium satellite, GPS and fleet tracking and management systems.

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FMS combines GPS technology with asset management software and satellite communications to provide a complete solution for all your fleet management and tracking ...

27. GPS Vehicle Tracking System | GPS Satellite Tracking ...
Our GPS vehicle tracking devices are the vehicle mounted or cargo embedded component of Safefreight's telematic GPS fleet tracking and management system.

28. SpyGear4U | GPS Vehicle Tracking Devices, Catch a Cheating Spouse
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Unique and latest software/hardware of vehicle tracking systems to deliver asset monitoring information for a wide range of industries & applications globally.

30. RMT GPS Tracking Systems
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Satellite Tracking GSM mobile phone tracking system via the GPS-TRACK satellite network. Based on repeater triangulation, the system tracks mobile phones ...

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