What is GPS - Global Positioning System & Its Usage

GPS - Global Positioning System Functionality and its Applications

A GPS is a Navigation System that uses satellites to track the positions of people and things on the earth. GPS is stands for Global Positioning System. GNSS - Global Navigation Satellite System that provides location and time information in all weather and at all times and anywhere on or near the Earth when and where there is an unobstructed line of sight to four or more GPS satellites

The navigational signals transmitted by GPS satellites encode a variety of information including satellite positions, the state of the internal clocks, and the health of the network. These signals are transmitted on two separate carrier frequencies that are common to all satellites in the network. Two different encodings are used, a public encoding that enables lower resolution navigation, and an encrypted encoding used by the U.S. military

The message format of GPS satellite continuously broadcasts a navigation message at a rate of 50 bits per second. Each complete message is composed of 30-second frames, distinct groupings of 1,500 bits of information. Each frame is further subdivided into 5 subframes of length 6 seconds and with 300 bits each. Each subframe contains 10 words of 30 bits with length 0.6 seconds each. Each 30 second frame begins precisely on the minute or half minute as indicated by the atomic clock on each satellite

The GPS band and Frequency
L1 band 1575.42 MHz
L2 band 1227.60 MHz
L3 band 1381.05 MHz
L4 band 1379.913 MHz
L5 band 1176.45 MHz

The Common Usage of GPS - Global Positioning System

1. Automobiles Industry: GPS - Global Positioning System tracking devices can be used to navigate your car through traffic and find your way to any destination. Many Auto GPS Systems come with preloaded destination settings or points of interest that provide directions to attractions, and important pit stops such as gas stations, hotels, motels, and lodges. For vacation travel, or any other time you need to map out a course for traveling, the system has course-planning functionality

2. GPS in Laptops: Laptop GPS receivers turn any mobile computer into a fully functional GPS System. Save money and use a laptop GPS receiver for in-vehicle, office based meetings to track locations and find directions or simply to plan a cycle ride for the next day. The in built sophistication of the laptop, augmented with navigation and mapping programs provides much more extensive information than most hand-held applications. By using laptop GPS navigation, you are using an already familiar tool, with no need to learn new hardware functionality. Laptop GPS receivers are simply attached to your laptop, notebook or ultra-small computer using USB or serial connections as with many other peripheral devices. Quite often bundled with software, they are very effective GPS systems

3. GeoCaching: Geocaching takes treasure hunting one step further by using GPS units to located hidden treasures. The name of the game is a combination of Geo from geography and Caching from the action of hiding the cache. The term cache is commonly used among hikers and campers to refer to a hidden supply of food or other provisions

4. Emergency Calls: GPS equipped cell phones can transmit precise locations to 911 dispatchers. This allows the dispatcher to have an immediate and accurate location instead of relying upon descriptions of people who may be unfamiliar with the area or too distraught to explain their location. The same technology has also helped catch people who make crank 911 calls from their GPS-enabled cell phone

5. Recreational Uses: GPS is popular among hikers, hunters, snow-mobilers, mountain bikers, and cross-country skiers. Rails can be viewed on topographic map software, traced on the screen and that route can be downloaded into the GPS. Then, in the field the route can be displayed in the map window of the GPS and easily followed. The tracklog can be shared with others, plotted on maps, used for distance hiked estimates and even printed with mapping software and shared with friends

6. Emergency Vehicle Assistance: OnStar by GM for example uses GPS to track vehicles' whereabouts and allows motorists to summon emergency help or to ask directions

7. Tracking Childs: GPS-enabled cell phones can be used to monitor your kids

8. Photography: Geocoding Photos Some cameras will annotate your digital and traditional images with the date and time; however, new GPS-enabled cameras can also annotate them with precision coordinates which mark the location of your photos


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