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What is GPS? Spy cameras Miami Coral Gables

The Global Positioning System (GPS) is a satellite-based navigation system made up of at least 24 satellites. Spy cameras Miami Coral Gables GPS works in any weather conditions, anywhere in the world, 24 hours a day, with no subscription fees or setup charges. Spy cameras Miami Coral Gables The U.S. Department of Defense (USDOD) originally put the satellites into orbit for military use, but they were made available for civilian use in the 1980s. Spy cameras Miami Coral Gables

How GPS works Spy cameras Miami Coral Gables

GPS satellites circle the Earth twice a day in a precise orbit. Each satellite transmits a unique signal and orbital parameters that allow GPS devices to decode and compute the precise location of the satellite. Spy cameras Miami Coral Gables GPS receivers use this information and trilateration to calculate a user's exact location. Spy cameras Miami Coral Gables Essentially, the GPS receiver measures the distance to each satellite by the amount of time it takes to receive a transmitted signal. With distance measurements from a few more satellites, the receiver can determine a user's position and display it electronically to measure your running route, map a golf course, find a way home or adventure anywhere. Spy cameras Miami Coral Gables

Spy cameras Miami Coral Gables To calculate your 2-D position (latitude and longitude) and track movement, a GPS receiver must be locked on to the signal of at least 3 satellites. Spy cameras Miami Coral Gables With 4 or more satellites in view, the receiver can determine your 3-D position (latitude, longitude and altitude). Spy cameras Miami Coral Gables Generally, a GPS receiver will track 8 or more satellites, but that depends on the time of day and where you are on the earth. Some devices can do all of that from your wrist. Spy cameras Miami Coral Gables

Spy cameras Miami Coral Gables Once your position has been determined, the GPS unit can calculate other information, such as: Spy cameras Miami Coral Gables

Speed Spy cameras Miami Coral Gables

Bearing Spy cameras Miami Coral Gables

Track Spy cameras Miami Coral Gables

Trip distance Spy cameras Miami Coral Gables

Distance to destination Spy cameras Miami Coral Gables

Sunrise and sunset time Spy cameras Miami Coral Gables

And more Spy cameras Miami Coral Gables

Spy cameras Miami Coral Gables

How accurate is GPS? Spy cameras Miami Coral Gables

Spy cameras Miami Coral Gables Today's GPS receivers are extremely accurate, thanks to their parallel multi-channel design. Our receivers are quick to lock onto satellites when first turned on. They maintain a tracking lock in dense tree-cover or in urban settings with tall buildings. Spy cameras Miami Coral Gables Certain atmospheric factors and other error sources can affect the accuracy of GPS receivers. Garmin GPS receivers are typically accurate to within 10 meters. Spy cameras Miami Coral Gables Accuracy is even better on the water. Spy cameras Miami Coral Gables

Some Garmin GPS receiver accuracy is improved with WAAS (Wide Area Augmentation System). Spy cameras Miami Coral Gables This capability can improve accuracy to better than 3 meters, by providing corrections to the atmosphere. No additional equipment or fees are required to take advantage of WAAS satellites. Users can also get better accuracy with Differential GPS (DGPS), which corrects GPS distances to within an average of 1 to 3 meters. The U.S. Coast Guard operates the most common DGPS correction service, consisting of a network of towers that receive GPS signals and transmit a corrected signal by beacon transmitters. In order to get the corrected signal, users must have a differential beacon receiver and beacon antenna in addition to their GPS. Spy cameras Miami Coral Gables

Other GPS Systems Spy cameras Miami Coral Gables

Spy cameras Miami Coral Gables There are other similar systems to GPS in the world, which are all classified as the Global Navigation Satellite System (GNSS). GLONASS is a satellite constellation system built by Russia. Spy cameras Miami Coral Gables The European Space Agency is creating Galileo, while China is creating BeiDou. Most Garmin receivers track both GLONASS and GPS, and some even track BeiDou. Spy cameras Miami Coral Gables You can expect a more reliable solution when you track more satellites. Spy cameras Miami Coral Gables You could be tracking nearly 20 with newer Garmin products. Spy cameras Miami Coral Gables

The GPS Satellite System Spy cameras Miami Coral Gables

Spy cameras Miami Coral Gables The 31 satellites that currently make up the GPS space segment are orbiting the earth about 12,000 miles above us. Spy cameras Miami Coral Gables These satellites are constantly moving, making two complete orbits in less than 24 hours. Spy cameras Miami Coral Gables They travel at speeds of roughly 7,000 miles an hour. Small rocket boosters keep each satellite Spy cameras Miami Coral Gables flying on the correct path. Spy cameras Miami Coral Gables

Here are some other interesting facts about the GPS satellites: Spy cameras Miami Coral Gables

The official USDOD name for GPS is NAVSTAR Spy cameras Miami Coral Gables

The first GPS satellite was launched in 1978. Spy cameras Miami Coral Gables

A full constellation of 24 satellites was achieved in 1994. Spy cameras Miami Coral Gables

Each satellite is built to last about 10 years. Replacements are constantly being built and launched into orbit. Spy cameras Miami Coral Gables

A GPS satellite weighs approximately 2,000 pounds and is about 17 feet across with the solar panels extended. Spy cameras Miami Coral Gables

GPS satellites are powered by solar energy, but they have backup batteries onboard, in case of a solar eclipse. Spy cameras Miami Coral Gables

Transmitter power is only 50 Watts or less. Spy cameras Miami Coral Gables

What's the signal? Spy cameras Miami Coral Gables

GPS satellites transmit at least 2 low-power radio signals. The signals travel by line of sight, meaning they will pass through clouds, glass and plastic but will not go through most solid objects, such as buildings and mountains. Spy cameras Miami Coral Gables However, modern receivers are more sensitive and can usually track through houses. Spy cameras Miami Coral Gables

A GPS signal contains 3 different types of information: Spy cameras Miami Coral Gables

Pseudorandom code Spy cameras Miami Coral Gables is an I.D. code that identifies which satellite is transmitting information. Spy cameras Miami Coral Gables You can see which satellites you are getting signals from on your device's satellite page. Spy cameras Miami Coral Gables

Ephemeris data Spy cameras Miami Coral Gables is needed to determine a satellite's position and gives important information about the health of a satellite, current date and time. Spy cameras Miami Coral Gables

Almanac data Spy cameras Miami Coral Gables tells the GPS receiver where each GPS satellite should be at any time throughout the day and shows the orbital information for that satellite and every other satellite in the system. Spy cameras Miami Coral Gables

GPS Signal Errors Sources Spy cameras Miami Coral Gables Spy cameras Miami Coral Gables

Factors that can affect GPS signal and accuracy include the following:

Ionosphere and troposphere delays: Satellite signals slow as they pass through the atmosphere. Spy cameras Miami Coral Gables The GPS system uses a built-in model to partially correct for this type of error. Spy cameras Miami Coral Gables

Signal multipath: The GPS signal may reflect off objects such as tall buildings or large rock surfaces before it reaches the receiver, which will increase the travel time of the signal and cause errors. Spy cameras Miami Coral Gables

Receiver clock errors: A receiver's built-in clock may have slight timing errors because it is less accurate than the atomic clocks on GPS satellites. Spy cameras Miami Coral Gables

Orbital errors: The satellite's reported location may not be accurate. Spy cameras Miami Coral Gables

Number of satellites visible: The more satellites a GPS receiver can "see," the better the accuracy. When a signal is blocked, you may get position errors or possibly no position reading at all. Spy cameras Miami Coral Gables GPS units typically will not work underwater or underground, but new high-sensitivity receivers are able to track some signals when inside buildings or under tree-cover. Spy cameras Miami Coral Gables

Satellite geometry/shading: Satellite signals are more effective when satellites are located at wide angles relative to each other, rather than in a line or tight grouping. Spy cameras Miami Coral Gables

Selective availability: The U.S. Department of Defense once applied Selective Availability (SA) to satellites, making signals less accurate in order to keep 'enemies' from using highly accurate GPS signals. Spy cameras Miami Coral Gables The government turned off SA in May of 2000, which improved the accuracy of civilian GPS receivers. Spy cameras Miami Coral Gables

Spy cameras Miami Coral Gables