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What is GPS? Real spy cams Miami Beach Hialeah GardensThe Global Positioning System (GPS) is a satellite-based navigation system made up of at least 24 satellites. Hidden surveillance camera system Miami Beach Hialeah GardensGPS works in any weather conditions, anywhere in the world, 24 hours a day, with no subscription fees or setup charges. Hidden surveillance camera system 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. Real spy cams Miami Beach Hialeah Gardens. Real Spy Cams Miami Beach hialeah Gardens
Real Spy Cams Miami Beach hialeah Gardens
How GPS works Real spy cams Miami Beach Hialeah Gardens
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. Hidden surveillance camera system Miami Beach Hialeah GardensGPS receivers use this information and tri lateration to calculate a user’s exact location. Hidden surveillance camera system 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. Real spy cams Miami Beach Hialeah Gardens
Real spy cams Miami Beach Hialeah Gardens
Hidden surveillance camera system 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. Hidden surveillance camera system Miami Beach Hialeah GardensWith 4 or more satellites in view, the receiver can determine your 3-D position (latitude, longitude and altitude). Hidden surveillance camera system 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. Real spy cams Miami Beach Hialeah Gardens
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Hidden surveillance camera system Miami Beach Hialeah GardensOnce your position has been determined, the GPS unit can calculate other information, such as: Real spy cams Miami Beach Hialeah Gardens
Hidden surveillance camera system Miami Beach Hialeah GardensYou can expect a more reliable solution when you track more satellites. Hidden surveillance camera system Miami Beach Hialeah GardensYou could be tracking nearly 20 with newer Garmin products. Real spy cams Miami Beach Hialeah Gardens
The GPS Satellite System Real spy cams Miami Beach Hialeah Gardens
Hidden surveillance camera system Miami Beach Hialeah GardensThe 31 satellites that currently make up the GPS space segment are orbiting the earth about 12,000 miles above us. Hidden surveillance camera system Miami Beach Hialeah GardensThese satellites are constantly moving, making two complete orbits in less than 24 hours. Hidden surveillance camera system Miami Beach Hialeah GardensThey travel at speeds of roughly 7,000 miles an hour. Small rocket boosters keep each satellite Hidden surveillance camera system Miami Beach Hialeah Gardensflying on the correct path. Real spy cams Miami Beach Hialeah Gardens
Here are some other interesting facts about the GPS satellites: Real spy cams Miami Beach Hialeah Gardens
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- The official USDOD name for GPS is NAVSTAR Real spy cams Miami Beach Hialeah Gardens
- The first GPS satellite was launched in 1978. Real spy cams Miami Beach Hialeah Gardens
- A full constellation of 24 satellites was achieved in 1994. Real spy cams Miami Beach Hialeah Gardens
- Each satellite is built to last about 10 years. Replacements are constantly being built and launched into orbit. Real spy cams Miami Beach Hialeah Gardens
- A GPS satellite weighs approximately 2,000 pounds and is about 17 feet across with the solar panels extended. Real spy cams Miami Beach Hialeah Gardens
- GPS satellites are powered by solar energy, but they have backup batteries onboard, in case of a solar eclipse. Real spy cams Miami Beach Hialeah Gardens
- Transmitter power is only 50 Watts or less. Real spy cams Miami Beach Hialeah Gardens
Real spy cams Miami Beach Hialeah Gardens
What’s the signal? Real spy cams Miami Beach Hialeah Gardens
Real Spy Cams Miami Beach hialeah Gardens
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. Hidden surveillance camera system Miami Beach Hialeah GardensHowever, modern receivers are more sensitive and can usually track through houses. Real spy cams Miami Beach Hialeah Gardens
A GPS signal contains 3 different types of information: Real spy cams Miami Beach Hialeah Gardens
- Pseudorandom code Hidden surveillance camera system Miami Beach Hialeah Gardensis an I.D. code that identifies which satellite is transmitting information. Hidden surveillance camera system Miami Beach Hialeah GardensYou can see which satellites you are getting signals from on your device’s satellite page. Real spy cams Miami Beach Hialeah Gardens
- Ephemeris dataHidden surveillance camera system 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. Real spy cams Miami Beach Hialeah Gardens
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- Almanac data Hidden surveillance camera system 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. Real spy cams Miami Beach Hialeah Gardens
GPS Signal Errors Sources Hidden surveillance camera system Miami Beach Hialeah GardensReal spy cams Miami Beach Hialeah Gardens
Factors that can affect GPS signal and accuracy include the following:
- Ionosphere and troposphere delays:Satellite signals slow as they pass through the atmosphere. Hidden surveillance camera system Miami Beach Hialeah GardensThe GPS system uses a built-in model to partially correct for this type of error. Real spy cams Miami Beach Hialeah Gardens
- 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. Real spy cams Miami Beach Hialeah Gardens
- 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. Real spy cams Miami Beach Hialeah Gardens
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- Orbital errors:The satellite’s reported location may not be accurate. Real spy cams 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. Hidden surveillance camera system 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. Real spy cams Miami Beach Hialeah Gardens
- 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. Real spy cams Miami Beach Hialeah Gardens
- 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. Hidden surveillance camera system Miami Beach Hialeah GardensThe government turned off SA in May of 2000, which improved the accuracy of civilian GPS receivers. Real spy cams Miami Beach Hialeah Gardens
- Real spy cams Miami Beach Hialeah Gardens
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