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What is GPS? ISpy video surveillance Miami Beach Coral GablesThe Global Positioning System (GPS) is a satellite-based navigation system made up of at least 24 satellites. Small cameras for spying Miami Beach Hialeah GardensGPS works in any weather conditions, anywhere in the world, 24 hours a day, with no subscription fees or setup charges. Small cameras for spying Miami Beach Hialeah GardensThe 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. ISpy video surveillance Miami Beach Coral Gables. Small cameras for spying Miami Beach Hialeah Gardens
Small cameras for spying Miami Beach Hialeah Gardens
How GPS works ISpy video surveillance Miami Beach 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. Small cameras for spying Miami Beach Hialeah GardensGPS receivers use this information and tri lateration to calculate a user’s exact location. Small cameras for spying Miami Beach Hialeah GardensEssentially, 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. ISpy video surveillance Miami Beach Coral Gables
Small cameras for spying Miami Beach Hialeah GardensTo 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. Small cameras for spying Miami Beach Hialeah GardensWith 4 or more satellites in view, the receiver can determine your 3-D position (latitude, longitude and altitude). Small cameras for spying Miami Beach Hialeah GardensGenerally, 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. ISpy video surveillance Miami Beach Coral Gables
Small cameras for spying Miami Beach Hialeah Gardens
Small cameras for spying Miami Beach Hialeah GardensOnce your position has been determined, the GPS unit can calculate other information, such as: ISpy video surveillance Miami Beach Coral Gables
- Speed ISpy video surveillance Miami Beach Coral Gables
- Bearing ISpy video surveillance Miami Beach Coral Gables
- Track ISpy video surveillance Miami Beach Coral Gables
- Trip distance ISpy video surveillance Miami Beach Coral Gables
- Distance to destination ISpy video surveillance Miami Beach Coral Gables
- Sunrise and sunset time ISpy video surveillance Miami Beach Coral Gables
And more ISpy video surveillance Miami Beach Coral Gables
ISpy video surveillance Miami Beach Coral Gables
ISpy video surveillance Miami Beach Coral Gables
How accurate is GPS? ISpy video surveillance Miami Beach Coral Gables
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Small cameras for spying Miami Beach Hialeah GardensToday’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.
Small cameras for spying Miami Beach Hialeah GardensCertain atmospheric factors and other error sources can affect the accuracy of GPS receivers. Garmin GPS receivers are typically accurate to within 10 meters. Small cameras for spying Miami Beach Hialeah GardensAccuracy is even better on the water. ISpy video surveillance Miami Beach Coral Gables
Other GPS Systems
Small cameras for spying Miami Beach Hialeah GardensThere 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. Small cameras for spying Miami Beach Hialeah GardensThe European Space Agency is creating Galileo, while China is creating BeiDou.
Most Garmin receivers track both GLONASS and GPS, and some even track BeiDou. Small cameras for spying Miami Beach Hialeah GardensYou can expect a more reliable solution when you track more satellites. Small cameras for spying Miami Beach Hialeah GardensYou could be tracking nearly 20 with newer Garmin products. ISpy video surveillance Miami Beach Coral Gables
Small cameras for spying Miami Beach Hialeah Gardens
The GPS Satellite System ISpy video surveillance Miami Beach Coral Gables
Small cameras for spying Miami Beach Hialeah GardensThe 31 satellites that currently make up the GPS space segment are orbiting the earth about 12,000 miles above us. Small cameras for spying Miami Beach Hialeah GardensThese satellites are constantly moving, making two complete orbits in less than 24 hours. Small cameras for spying Miami Beach Hialeah GardensThey travel at speeds of roughly 7,000 miles an hour. Small rocket boosters keep each satellite Small cameras for spying Miami Beach Hialeah Gardensflying on the correct path. ISpy video surveillance Miami Beach Coral Gables
Here are some other interesting facts about the GPS satellites: ISpy video surveillance Miami Beach Coral Gables
- The official USDOD name for GPS is NAVSTAR ISpy video surveillance Miami Beach Coral Gables
- The first GPS satellite was launched in 1978. ISpy video surveillance Miami Beach Coral Gables
- A full constellation of 24 satellites was achieved in 1994. ISpy video surveillance Miami Beach Coral Gables
- Each satellite is built to last about 10 years. Replacements are constantly being built and launched into orbit. ISpy video surveillance Miami Beach Coral Gables
- A GPS satellite weighs approximately 2,000 pounds and is about 17 feet across with the solar panels extended. ISpy video surveillance Miami Beach Coral Gables
- GPS satellites are powered by solar energy, but they have backup batteries onboard, in case of a solar eclipse. ISpy video surveillance Miami Beach Coral Gables
Small cameras for spying Miami Beach Hialeah Gardens
- Transmitter power is only 50 Watts or less. ISpy video surveillance Miami Beach Coral Gables
ISpy video surveillance Miami Beach Coral Gables
What’s the signal? ISpy video surveillance Miami Beach 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. Small cameras for spying Miami Beach Hialeah GardensHowever, modern receivers are more sensitive and can usually track through houses. ISpy video surveillance Miami Beach Coral Gables
A GPS signal contains 3 different types of information: ISpy video surveillance Miami Beach Coral Gables
- Pseudorandom code Small cameras for spying Miami Beach Hialeah Gardensis an I.D. code that identifies which satellite is transmitting information. Small cameras for spying Miami Beach Hialeah GardensYou can see which satellites you are getting signals from on your device’s satellite page. ISpy video surveillance Miami Beach Coral Gables
- Ephemeris dataSmall cameras for spying Miami Beach Hialeah Gardensis needed to determine a satellite’s position and gives important information about the health of a satellite, current date and time. ISpy video surveillance Miami Beach Coral Gables
Small cameras for spying Miami Beach Hialeah Gardens
- Almanac data Small cameras for spying Miami Beach Hialeah Gardenstells 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. ISpy video surveillance Miami Beach Coral Gables
GPS Signal Errors Sources Small cameras for spying Miami Beach Hialeah GardensISpy video surveillance Miami Beach 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. Small cameras for spying Miami Beach Hialeah GardensThe GPS system uses a built-in model to partially correct for this type of error. ISpy video surveillance Miami Beach 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. ISpy video surveillance Miami Beach 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. ISpy video surveillance Miami Beach Coral Gables
- Orbital errors:The satellite’s reported location may not be accurate. ISpy video surveillance Miami Beach Coral Gables
Small cameras for spying Miami Beach Hialeah Gardens
- 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. Small cameras for spying Miami Beach Hialeah GardensGPS 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. ISpy video surveillance Miami Beach 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. ISpy video surveillance Miami Beach 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. Small cameras for spying Miami Beach Hialeah GardensThe government turned off SA in May of 2000, which improved the accuracy of civilian GPS receivers. ISpy video surveillance Miami Beach Coral Gables
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